import { getKeybindings } from "../keybindings.js";
import { decodeKittyPrintable, matchesKey } from "../keys.js";
import { KillRing } from "../kill-ring.js";
import { CURSOR_MARKER } from "../tui.js";
import { UndoStack } from "../undo-stack.js";
import { getSegmenter, isPunctuationChar, isWhitespaceChar, truncateToWidth, visibleWidth } from "../utils.js";
import { SelectList } from "./select-list.js";
const baseSegmenter = getSegmenter();
/** Regex matching paste markers like `[paste #1 +123 lines]` or `[paste #2 1234 chars]`. */
const PASTE_MARKER_REGEX = /\[paste #(\d+)( (\+\d+ lines|\d+ chars))?\]/g;
/** Non-global version for single-segment testing. */
const PASTE_MARKER_SINGLE = /^\[paste #(\d+)( (\+\d+ lines|\d+ chars))?\]$/;
/** Check if a segment is a paste marker (i.e. was merged by segmentWithMarkers). */
function isPasteMarker(segment) {
    return segment.length >= 10 && PASTE_MARKER_SINGLE.test(segment);
}
/**
 * A segmenter that wraps Intl.Segmenter and merges graphemes that fall
 * within paste markers into single atomic segments.  This makes cursor
 * movement, deletion, word-wrap, etc. treat paste markers as single units.
 *
 * Only markers whose numeric ID exists in `validIds` are merged.
 */
function segmentWithMarkers(text, validIds) {
    // Fast path: no paste markers in the text or no valid IDs.
    if (validIds.size === 0 || !text.includes("[paste #")) {
        return baseSegmenter.segment(text);
    }
    // Find all marker spans with valid IDs.
    const markers = [];
    for (const m of text.matchAll(PASTE_MARKER_REGEX)) {
        const id = Number.parseInt(m[1], 10);
        if (!validIds.has(id))
            continue;
        markers.push({ start: m.index, end: m.index + m[0].length });
    }
    if (markers.length === 0) {
        return baseSegmenter.segment(text);
    }
    // Build merged segment list.
    const baseSegments = baseSegmenter.segment(text);
    const result = [];
    let markerIdx = 0;
    for (const seg of baseSegments) {
        // Skip past markers that are entirely before this segment.
        while (markerIdx < markers.length && markers[markerIdx].end <= seg.index) {
            markerIdx++;
        }
        const marker = markerIdx < markers.length ? markers[markerIdx] : null;
        if (marker && seg.index >= marker.start && seg.index < marker.end) {
            // This segment falls inside a marker.
            // If this is the first segment of the marker, emit a merged segment.
            if (seg.index === marker.start) {
                const markerText = text.slice(marker.start, marker.end);
                result.push({
                    segment: markerText,
                    index: marker.start,
                    input: text,
                });
            }
            // Otherwise skip (already merged into the first segment).
        }
        else {
            result.push(seg);
        }
    }
    return result;
}
/**
 * Split a line into word-wrapped chunks.
 * Wraps at word boundaries when possible, falling back to character-level
 * wrapping for words longer than the available width.
 *
 * @param line - The text line to wrap
 * @param maxWidth - Maximum visible width per chunk
 * @param preSegmented - Optional pre-segmented graphemes (e.g. with paste-marker awareness).
 *                       When omitted the default Intl.Segmenter is used.
 * @returns Array of chunks with text and position information
 */
export function wordWrapLine(line, maxWidth, preSegmented) {
    if (!line || maxWidth <= 0) {
        return [{ text: "", startIndex: 0, endIndex: 0 }];
    }
    const lineWidth = visibleWidth(line);
    if (lineWidth <= maxWidth) {
        return [{ text: line, startIndex: 0, endIndex: line.length }];
    }
    const chunks = [];
    const segments = preSegmented ?? [...baseSegmenter.segment(line)];
    let currentWidth = 0;
    let chunkStart = 0;
    // Wrap opportunity: the position after the last whitespace before a non-whitespace
    // grapheme, i.e. where a line break is allowed.
    let wrapOppIndex = -1;
    let wrapOppWidth = 0;
    for (let i = 0; i < segments.length; i++) {
        const seg = segments[i];
        const grapheme = seg.segment;
        const gWidth = visibleWidth(grapheme);
        const charIndex = seg.index;
        const isWs = !isPasteMarker(grapheme) && isWhitespaceChar(grapheme);
        // Overflow check before advancing.
        if (currentWidth + gWidth > maxWidth) {
            if (wrapOppIndex >= 0 && currentWidth - wrapOppWidth + gWidth <= maxWidth) {
                // Backtrack to last wrap opportunity (the remaining content
                // plus the current grapheme still fits within maxWidth).
                chunks.push({ text: line.slice(chunkStart, wrapOppIndex), startIndex: chunkStart, endIndex: wrapOppIndex });
                chunkStart = wrapOppIndex;
                currentWidth -= wrapOppWidth;
            }
            else if (chunkStart < charIndex) {
                // No viable wrap opportunity: force-break at current position.
                // This also handles the case where backtracking to a word
                // boundary wouldn't help because the remaining content plus
                // the current grapheme (e.g. a wide character) still exceeds
                // maxWidth.
                chunks.push({ text: line.slice(chunkStart, charIndex), startIndex: chunkStart, endIndex: charIndex });
                chunkStart = charIndex;
                currentWidth = 0;
            }
            wrapOppIndex = -1;
        }
        if (gWidth > maxWidth) {
            // Single atomic segment wider than maxWidth (e.g. paste marker
            // in a narrow terminal). Re-wrap it at grapheme granularity.
            // The segment remains logically atomic for cursor
            // movement / editing — the split is purely visual for word-wrap layout.
            const subChunks = wordWrapLine(grapheme, maxWidth);
            for (let j = 0; j < subChunks.length - 1; j++) {
                const sc = subChunks[j];
                chunks.push({ text: sc.text, startIndex: charIndex + sc.startIndex, endIndex: charIndex + sc.endIndex });
            }
            const last = subChunks[subChunks.length - 1];
            chunkStart = charIndex + last.startIndex;
            currentWidth = visibleWidth(last.text);
            wrapOppIndex = -1;
            continue;
        }
        // Advance.
        currentWidth += gWidth;
        // Record wrap opportunity: whitespace followed by non-whitespace.
        // Multiple spaces join (no break between them); the break point is
        // after the last space before the next word.
        const next = segments[i + 1];
        if (isWs && next && (isPasteMarker(next.segment) || !isWhitespaceChar(next.segment))) {
            wrapOppIndex = next.index;
            wrapOppWidth = currentWidth;
        }
    }
    // Push final chunk.
    chunks.push({ text: line.slice(chunkStart), startIndex: chunkStart, endIndex: line.length });
    return chunks;
}
const SLASH_COMMAND_SELECT_LIST_LAYOUT = {
    minPrimaryColumnWidth: 12,
    maxPrimaryColumnWidth: 32,
};
const ATTACHMENT_AUTOCOMPLETE_DEBOUNCE_MS = 20;
export class Editor {
    state = {
        lines: [""],
        cursorLine: 0,
        cursorCol: 0,
    };
    /** Focusable interface - set by TUI when focus changes */
    focused = false;
    tui;
    theme;
    paddingX = 0;
    // Store last render width for cursor navigation
    lastWidth = 80;
    // Vertical scrolling support
    scrollOffset = 0;
    // Border color (can be changed dynamically)
    borderColor;
    // Autocomplete support
    autocompleteProvider;
    autocompleteList;
    autocompleteState = null;
    autocompletePrefix = "";
    autocompleteMaxVisible = 5;
    autocompleteAbort;
    autocompleteDebounceTimer;
    autocompleteRequestTask = Promise.resolve();
    autocompleteStartToken = 0;
    autocompleteRequestId = 0;
    // Paste tracking for large pastes
    pastes = new Map();
    pasteCounter = 0;
    // Bracketed paste mode buffering
    pasteBuffer = "";
    isInPaste = false;
    // Prompt history for up/down navigation
    history = [];
    historyIndex = -1; // -1 = not browsing, 0 = most recent, 1 = older, etc.
    // Kill ring for Emacs-style kill/yank operations
    killRing = new KillRing();
    lastAction = null;
    // Character jump mode
    jumpMode = null;
    // Preferred visual column for vertical cursor movement (sticky column)
    preferredVisualCol = null;
    // Undo support
    undoStack = new UndoStack();
    onSubmit;
    onChange;
    disableSubmit = false;
    constructor(tui, theme, options = {}) {
        this.tui = tui;
        this.theme = theme;
        this.borderColor = theme.borderColor;
        const paddingX = options.paddingX ?? 0;
        this.paddingX = Number.isFinite(paddingX) ? Math.max(0, Math.floor(paddingX)) : 0;
        const maxVisible = options.autocompleteMaxVisible ?? 5;
        this.autocompleteMaxVisible = Number.isFinite(maxVisible) ? Math.max(3, Math.min(20, Math.floor(maxVisible))) : 5;
    }
    /** Set of currently valid paste IDs, for marker-aware segmentation. */
    validPasteIds() {
        return new Set(this.pastes.keys());
    }
    /** Segment text with paste-marker awareness, only merging markers with valid IDs. */
    segment(text) {
        return segmentWithMarkers(text, this.validPasteIds());
    }
    getPaddingX() {
        return this.paddingX;
    }
    setPaddingX(padding) {
        const newPadding = Number.isFinite(padding) ? Math.max(0, Math.floor(padding)) : 0;
        if (this.paddingX !== newPadding) {
            this.paddingX = newPadding;
            this.tui.requestRender();
        }
    }
    getAutocompleteMaxVisible() {
        return this.autocompleteMaxVisible;
    }
    setAutocompleteMaxVisible(maxVisible) {
        const newMaxVisible = Number.isFinite(maxVisible) ? Math.max(3, Math.min(20, Math.floor(maxVisible))) : 5;
        if (this.autocompleteMaxVisible !== newMaxVisible) {
            this.autocompleteMaxVisible = newMaxVisible;
            this.tui.requestRender();
        }
    }
    setAutocompleteProvider(provider) {
        this.cancelAutocomplete();
        this.autocompleteProvider = provider;
    }
    /**
     * Add a prompt to history for up/down arrow navigation.
     * Called after successful submission.
     */
    addToHistory(text) {
        const trimmed = text.trim();
        if (!trimmed)
            return;
        // Don't add consecutive duplicates
        if (this.history.length > 0 && this.history[0] === trimmed)
            return;
        this.history.unshift(trimmed);
        // Limit history size
        if (this.history.length > 100) {
            this.history.pop();
        }
    }
    isEditorEmpty() {
        return this.state.lines.length === 1 && this.state.lines[0] === "";
    }
    isOnFirstVisualLine() {
        const visualLines = this.buildVisualLineMap(this.lastWidth);
        const currentVisualLine = this.findCurrentVisualLine(visualLines);
        return currentVisualLine === 0;
    }
    isOnLastVisualLine() {
        const visualLines = this.buildVisualLineMap(this.lastWidth);
        const currentVisualLine = this.findCurrentVisualLine(visualLines);
        return currentVisualLine === visualLines.length - 1;
    }
    navigateHistory(direction) {
        this.lastAction = null;
        if (this.history.length === 0)
            return;
        const newIndex = this.historyIndex - direction; // Up(-1) increases index, Down(1) decreases
        if (newIndex < -1 || newIndex >= this.history.length)
            return;
        // Capture state when first entering history browsing mode
        if (this.historyIndex === -1 && newIndex >= 0) {
            this.pushUndoSnapshot();
        }
        this.historyIndex = newIndex;
        if (this.historyIndex === -1) {
            // Returned to "current" state - clear editor
            this.setTextInternal("");
        }
        else {
            this.setTextInternal(this.history[this.historyIndex] || "");
        }
    }
    /** Internal setText that doesn't reset history state - used by navigateHistory */
    setTextInternal(text) {
        const lines = text.split("\n");
        this.state.lines = lines.length === 0 ? [""] : lines;
        this.state.cursorLine = this.state.lines.length - 1;
        this.setCursorCol(this.state.lines[this.state.cursorLine]?.length || 0);
        // Reset scroll - render() will adjust to show cursor
        this.scrollOffset = 0;
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    invalidate() {
        // No cached state to invalidate currently
    }
    render(width) {
        const maxPadding = Math.max(0, Math.floor((width - 1) / 2));
        const paddingX = Math.min(this.paddingX, maxPadding);
        const contentWidth = Math.max(1, width - paddingX * 2);
        // Layout width: with padding the cursor can overflow into it,
        // without padding we reserve 1 column for the cursor.
        const layoutWidth = Math.max(1, contentWidth - (paddingX ? 0 : 1));
        // Store for cursor navigation (must match wrapping width)
        this.lastWidth = layoutWidth;
        const horizontal = this.borderColor("─");
        // Layout the text
        const layoutLines = this.layoutText(layoutWidth);
        // Calculate max visible lines: 30% of terminal height, minimum 5 lines
        const terminalRows = this.tui.terminal.rows;
        const maxVisibleLines = Math.max(5, Math.floor(terminalRows * 0.3));
        // Find the cursor line index in layoutLines
        let cursorLineIndex = layoutLines.findIndex((line) => line.hasCursor);
        if (cursorLineIndex === -1)
            cursorLineIndex = 0;
        // Adjust scroll offset to keep cursor visible
        if (cursorLineIndex < this.scrollOffset) {
            this.scrollOffset = cursorLineIndex;
        }
        else if (cursorLineIndex >= this.scrollOffset + maxVisibleLines) {
            this.scrollOffset = cursorLineIndex - maxVisibleLines + 1;
        }
        // Clamp scroll offset to valid range
        const maxScrollOffset = Math.max(0, layoutLines.length - maxVisibleLines);
        this.scrollOffset = Math.max(0, Math.min(this.scrollOffset, maxScrollOffset));
        // Get visible lines slice
        const visibleLines = layoutLines.slice(this.scrollOffset, this.scrollOffset + maxVisibleLines);
        const result = [];
        const leftPadding = " ".repeat(paddingX);
        const rightPadding = leftPadding;
        // Render top border (with scroll indicator if scrolled down)
        if (this.scrollOffset > 0) {
            const indicator = `─── ↑ ${this.scrollOffset} more `;
            const remaining = width - visibleWidth(indicator);
            if (remaining >= 0) {
                result.push(this.borderColor(indicator + "─".repeat(remaining)));
            }
            else {
                result.push(this.borderColor(truncateToWidth(indicator, width)));
            }
        }
        else {
            result.push(horizontal.repeat(width));
        }
        // Render each visible layout line
        // Emit hardware cursor marker only when focused and not showing autocomplete
        const emitCursorMarker = this.focused && !this.autocompleteState;
        for (const layoutLine of visibleLines) {
            let displayText = layoutLine.text;
            let lineVisibleWidth = visibleWidth(layoutLine.text);
            let cursorInPadding = false;
            // Add cursor if this line has it
            if (layoutLine.hasCursor && layoutLine.cursorPos !== undefined) {
                const before = displayText.slice(0, layoutLine.cursorPos);
                const after = displayText.slice(layoutLine.cursorPos);
                // Hardware cursor marker (zero-width, emitted before fake cursor for IME positioning)
                const marker = emitCursorMarker ? CURSOR_MARKER : "";
                if (after.length > 0) {
                    // Cursor is on a character (grapheme) - replace it with highlighted version
                    // Get the first grapheme from 'after'
                    const afterGraphemes = [...this.segment(after)];
                    const firstGrapheme = afterGraphemes[0]?.segment || "";
                    const restAfter = after.slice(firstGrapheme.length);
                    const cursor = `\x1b[7m${firstGrapheme}\x1b[0m`;
                    displayText = before + marker + cursor + restAfter;
                    // lineVisibleWidth stays the same - we're replacing, not adding
                }
                else {
                    // Cursor is at the end - add highlighted space
                    const cursor = "\x1b[7m \x1b[0m";
                    displayText = before + marker + cursor;
                    lineVisibleWidth = lineVisibleWidth + 1;
                    // If cursor overflows content width into the padding, flag it
                    if (lineVisibleWidth > contentWidth && paddingX > 0) {
                        cursorInPadding = true;
                    }
                }
            }
            // Calculate padding based on actual visible width
            const padding = " ".repeat(Math.max(0, contentWidth - lineVisibleWidth));
            const lineRightPadding = cursorInPadding ? rightPadding.slice(1) : rightPadding;
            // Render the line (no side borders, just horizontal lines above and below)
            result.push(`${leftPadding}${displayText}${padding}${lineRightPadding}`);
        }
        // Render bottom border (with scroll indicator if more content below)
        const linesBelow = layoutLines.length - (this.scrollOffset + visibleLines.length);
        if (linesBelow > 0) {
            const indicator = `─── ↓ ${linesBelow} more `;
            const remaining = width - visibleWidth(indicator);
            result.push(this.borderColor(indicator + "─".repeat(Math.max(0, remaining))));
        }
        else {
            result.push(horizontal.repeat(width));
        }
        // Add autocomplete list if active
        if (this.autocompleteState && this.autocompleteList) {
            const autocompleteResult = this.autocompleteList.render(contentWidth);
            for (const line of autocompleteResult) {
                const lineWidth = visibleWidth(line);
                const linePadding = " ".repeat(Math.max(0, contentWidth - lineWidth));
                result.push(`${leftPadding}${line}${linePadding}${rightPadding}`);
            }
        }
        return result;
    }
    handleInput(data) {
        const kb = getKeybindings();
        // Handle character jump mode (awaiting next character to jump to)
        if (this.jumpMode !== null) {
            // Cancel if the hotkey is pressed again
            if (kb.matches(data, "tui.editor.jumpForward") || kb.matches(data, "tui.editor.jumpBackward")) {
                this.jumpMode = null;
                return;
            }
            if (data.charCodeAt(0) >= 32) {
                // Printable character - perform the jump
                const direction = this.jumpMode;
                this.jumpMode = null;
                this.jumpToChar(data, direction);
                return;
            }
            // Control character - cancel and fall through to normal handling
            this.jumpMode = null;
        }
        // Handle bracketed paste mode
        if (data.includes("\x1b[200~")) {
            this.isInPaste = true;
            this.pasteBuffer = "";
            data = data.replace("\x1b[200~", "");
        }
        if (this.isInPaste) {
            this.pasteBuffer += data;
            const endIndex = this.pasteBuffer.indexOf("\x1b[201~");
            if (endIndex !== -1) {
                const pasteContent = this.pasteBuffer.substring(0, endIndex);
                if (pasteContent.length > 0) {
                    this.handlePaste(pasteContent);
                }
                this.isInPaste = false;
                const remaining = this.pasteBuffer.substring(endIndex + 6);
                this.pasteBuffer = "";
                if (remaining.length > 0) {
                    this.handleInput(remaining);
                }
                return;
            }
            return;
        }
        // Ctrl+C - let parent handle (exit/clear)
        if (kb.matches(data, "tui.input.copy")) {
            return;
        }
        // Undo
        if (kb.matches(data, "tui.editor.undo")) {
            this.undo();
            return;
        }
        // Handle autocomplete mode
        if (this.autocompleteState && this.autocompleteList) {
            if (kb.matches(data, "tui.select.cancel")) {
                this.cancelAutocomplete();
                return;
            }
            if (kb.matches(data, "tui.select.up") || kb.matches(data, "tui.select.down")) {
                this.autocompleteList.handleInput(data);
                return;
            }
            if (kb.matches(data, "tui.input.tab")) {
                const selected = this.autocompleteList.getSelectedItem();
                if (selected && this.autocompleteProvider) {
                    this.pushUndoSnapshot();
                    this.lastAction = null;
                    const result = this.autocompleteProvider.applyCompletion(this.state.lines, this.state.cursorLine, this.state.cursorCol, selected, this.autocompletePrefix);
                    this.state.lines = result.lines;
                    this.state.cursorLine = result.cursorLine;
                    this.setCursorCol(result.cursorCol);
                    this.cancelAutocomplete();
                    if (this.onChange)
                        this.onChange(this.getText());
                }
                return;
            }
            if (kb.matches(data, "tui.select.confirm")) {
                const selected = this.autocompleteList.getSelectedItem();
                if (selected && this.autocompleteProvider) {
                    this.pushUndoSnapshot();
                    this.lastAction = null;
                    const result = this.autocompleteProvider.applyCompletion(this.state.lines, this.state.cursorLine, this.state.cursorCol, selected, this.autocompletePrefix);
                    this.state.lines = result.lines;
                    this.state.cursorLine = result.cursorLine;
                    this.setCursorCol(result.cursorCol);
                    if (this.autocompletePrefix.startsWith("/")) {
                        this.cancelAutocomplete();
                        // Fall through to submit
                    }
                    else {
                        this.cancelAutocomplete();
                        if (this.onChange)
                            this.onChange(this.getText());
                        return;
                    }
                }
            }
        }
        // Tab - trigger completion
        if (kb.matches(data, "tui.input.tab") && !this.autocompleteState) {
            this.handleTabCompletion();
            return;
        }
        // Deletion actions
        if (kb.matches(data, "tui.editor.deleteToLineEnd")) {
            this.deleteToEndOfLine();
            return;
        }
        if (kb.matches(data, "tui.editor.deleteToLineStart")) {
            this.deleteToStartOfLine();
            return;
        }
        if (kb.matches(data, "tui.editor.deleteWordBackward")) {
            this.deleteWordBackwards();
            return;
        }
        if (kb.matches(data, "tui.editor.deleteWordForward")) {
            this.deleteWordForward();
            return;
        }
        if (kb.matches(data, "tui.editor.deleteCharBackward") || matchesKey(data, "shift+backspace")) {
            this.handleBackspace();
            return;
        }
        if (kb.matches(data, "tui.editor.deleteCharForward") || matchesKey(data, "shift+delete")) {
            this.handleForwardDelete();
            return;
        }
        // Kill ring actions
        if (kb.matches(data, "tui.editor.yank")) {
            this.yank();
            return;
        }
        if (kb.matches(data, "tui.editor.yankPop")) {
            this.yankPop();
            return;
        }
        // Cursor movement actions
        if (kb.matches(data, "tui.editor.cursorLineStart")) {
            this.moveToLineStart();
            return;
        }
        if (kb.matches(data, "tui.editor.cursorLineEnd")) {
            this.moveToLineEnd();
            return;
        }
        if (kb.matches(data, "tui.editor.cursorWordLeft")) {
            this.moveWordBackwards();
            return;
        }
        if (kb.matches(data, "tui.editor.cursorWordRight")) {
            this.moveWordForwards();
            return;
        }
        // New line
        if (kb.matches(data, "tui.input.newLine") ||
            (data.charCodeAt(0) === 10 && data.length > 1) ||
            data === "\x1b\r" ||
            data === "\x1b[13;2~" ||
            (data.length > 1 && data.includes("\x1b") && data.includes("\r")) ||
            (data === "\n" && data.length === 1)) {
            if (this.shouldSubmitOnBackslashEnter(data, kb)) {
                this.handleBackspace();
                this.submitValue();
                return;
            }
            this.addNewLine();
            return;
        }
        // Submit (Enter)
        if (kb.matches(data, "tui.input.submit")) {
            if (this.disableSubmit)
                return;
            // Workaround for terminals without Shift+Enter support:
            // If char before cursor is \, delete it and insert newline instead of submitting.
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            if (this.state.cursorCol > 0 && currentLine[this.state.cursorCol - 1] === "\\") {
                this.handleBackspace();
                this.addNewLine();
                return;
            }
            this.submitValue();
            return;
        }
        // Arrow key navigation (with history support)
        if (kb.matches(data, "tui.editor.cursorUp")) {
            if (this.isEditorEmpty()) {
                this.navigateHistory(-1);
            }
            else if (this.historyIndex > -1 && this.isOnFirstVisualLine()) {
                this.navigateHistory(-1);
            }
            else if (this.isOnFirstVisualLine()) {
                // Already at top - jump to start of line
                this.moveToLineStart();
            }
            else {
                this.moveCursor(-1, 0);
            }
            return;
        }
        if (kb.matches(data, "tui.editor.cursorDown")) {
            if (this.historyIndex > -1 && this.isOnLastVisualLine()) {
                this.navigateHistory(1);
            }
            else if (this.isOnLastVisualLine()) {
                // Already at bottom - jump to end of line
                this.moveToLineEnd();
            }
            else {
                this.moveCursor(1, 0);
            }
            return;
        }
        if (kb.matches(data, "tui.editor.cursorRight")) {
            this.moveCursor(0, 1);
            return;
        }
        if (kb.matches(data, "tui.editor.cursorLeft")) {
            this.moveCursor(0, -1);
            return;
        }
        // Page up/down - scroll by page and move cursor
        if (kb.matches(data, "tui.editor.pageUp")) {
            this.pageScroll(-1);
            return;
        }
        if (kb.matches(data, "tui.editor.pageDown")) {
            this.pageScroll(1);
            return;
        }
        // Character jump mode triggers
        if (kb.matches(data, "tui.editor.jumpForward")) {
            this.jumpMode = "forward";
            return;
        }
        if (kb.matches(data, "tui.editor.jumpBackward")) {
            this.jumpMode = "backward";
            return;
        }
        // Shift+Space - insert regular space
        if (matchesKey(data, "shift+space")) {
            this.insertCharacter(" ");
            return;
        }
        const kittyPrintable = decodeKittyPrintable(data);
        if (kittyPrintable !== undefined) {
            this.insertCharacter(kittyPrintable);
            return;
        }
        // Regular characters
        if (data.charCodeAt(0) >= 32) {
            this.insertCharacter(data);
        }
    }
    layoutText(contentWidth) {
        const layoutLines = [];
        if (this.state.lines.length === 0 || (this.state.lines.length === 1 && this.state.lines[0] === "")) {
            // Empty editor
            layoutLines.push({
                text: "",
                hasCursor: true,
                cursorPos: 0,
            });
            return layoutLines;
        }
        // Process each logical line
        for (let i = 0; i < this.state.lines.length; i++) {
            const line = this.state.lines[i] || "";
            const isCurrentLine = i === this.state.cursorLine;
            const lineVisibleWidth = visibleWidth(line);
            if (lineVisibleWidth <= contentWidth) {
                // Line fits in one layout line
                if (isCurrentLine) {
                    layoutLines.push({
                        text: line,
                        hasCursor: true,
                        cursorPos: this.state.cursorCol,
                    });
                }
                else {
                    layoutLines.push({
                        text: line,
                        hasCursor: false,
                    });
                }
            }
            else {
                // Line needs wrapping - use word-aware wrapping
                const chunks = wordWrapLine(line, contentWidth, [...this.segment(line)]);
                for (let chunkIndex = 0; chunkIndex < chunks.length; chunkIndex++) {
                    const chunk = chunks[chunkIndex];
                    if (!chunk)
                        continue;
                    const cursorPos = this.state.cursorCol;
                    const isLastChunk = chunkIndex === chunks.length - 1;
                    // Determine if cursor is in this chunk
                    // For word-wrapped chunks, we need to handle the case where
                    // cursor might be in trimmed whitespace at end of chunk
                    let hasCursorInChunk = false;
                    let adjustedCursorPos = 0;
                    if (isCurrentLine) {
                        if (isLastChunk) {
                            // Last chunk: cursor belongs here if >= startIndex
                            hasCursorInChunk = cursorPos >= chunk.startIndex;
                            adjustedCursorPos = cursorPos - chunk.startIndex;
                        }
                        else {
                            // Non-last chunk: cursor belongs here if in range [startIndex, endIndex)
                            // But we need to handle the visual position in the trimmed text
                            hasCursorInChunk = cursorPos >= chunk.startIndex && cursorPos < chunk.endIndex;
                            if (hasCursorInChunk) {
                                adjustedCursorPos = cursorPos - chunk.startIndex;
                                // Clamp to text length (in case cursor was in trimmed whitespace)
                                if (adjustedCursorPos > chunk.text.length) {
                                    adjustedCursorPos = chunk.text.length;
                                }
                            }
                        }
                    }
                    if (hasCursorInChunk) {
                        layoutLines.push({
                            text: chunk.text,
                            hasCursor: true,
                            cursorPos: adjustedCursorPos,
                        });
                    }
                    else {
                        layoutLines.push({
                            text: chunk.text,
                            hasCursor: false,
                        });
                    }
                }
            }
        }
        return layoutLines;
    }
    getText() {
        return this.state.lines.join("\n");
    }
    expandPasteMarkers(text) {
        let result = text;
        for (const [pasteId, pasteContent] of this.pastes) {
            const markerRegex = new RegExp(`\\[paste #${pasteId}( (\\+\\d+ lines|\\d+ chars))?\\]`, "g");
            result = result.replace(markerRegex, () => pasteContent);
        }
        return result;
    }
    /**
     * Get text with paste markers expanded to their actual content.
     * Use this when you need the full content (e.g., for external editor).
     */
    getExpandedText() {
        return this.expandPasteMarkers(this.state.lines.join("\n"));
    }
    getLines() {
        return [...this.state.lines];
    }
    getCursor() {
        return { line: this.state.cursorLine, col: this.state.cursorCol };
    }
    setText(text) {
        this.cancelAutocomplete();
        this.lastAction = null;
        this.historyIndex = -1; // Exit history browsing mode
        const normalized = this.normalizeText(text);
        // Push undo snapshot if content differs (makes programmatic changes undoable)
        if (this.getText() !== normalized) {
            this.pushUndoSnapshot();
        }
        this.setTextInternal(normalized);
    }
    /**
     * Insert text at the current cursor position.
     * Used for programmatic insertion (e.g., clipboard image markers).
     * This is atomic for undo - single undo restores entire pre-insert state.
     */
    insertTextAtCursor(text) {
        if (!text)
            return;
        this.cancelAutocomplete();
        this.pushUndoSnapshot();
        this.lastAction = null;
        this.historyIndex = -1;
        this.insertTextAtCursorInternal(text);
    }
    /**
     * Normalize text for editor storage:
     * - Normalize line endings (\r\n and \r -> \n)
     * - Expand tabs to 4 spaces
     */
    normalizeText(text) {
        return text.replace(/\r\n/g, "\n").replace(/\r/g, "\n").replace(/\t/g, "    ");
    }
    /**
     * Internal text insertion at cursor. Handles single and multi-line text.
     * Does not push undo snapshots or trigger autocomplete - caller is responsible.
     * Normalizes line endings and calls onChange once at the end.
     */
    insertTextAtCursorInternal(text) {
        if (!text)
            return;
        // Normalize line endings and tabs
        const normalized = this.normalizeText(text);
        const insertedLines = normalized.split("\n");
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        const beforeCursor = currentLine.slice(0, this.state.cursorCol);
        const afterCursor = currentLine.slice(this.state.cursorCol);
        if (insertedLines.length === 1) {
            // Single line - insert at cursor position
            this.state.lines[this.state.cursorLine] = beforeCursor + normalized + afterCursor;
            this.setCursorCol(this.state.cursorCol + normalized.length);
        }
        else {
            // Multi-line insertion
            this.state.lines = [
                // All lines before current line
                ...this.state.lines.slice(0, this.state.cursorLine),
                // The first inserted line merged with text before cursor
                beforeCursor + insertedLines[0],
                // All middle inserted lines
                ...insertedLines.slice(1, -1),
                // The last inserted line with text after cursor
                insertedLines[insertedLines.length - 1] + afterCursor,
                // All lines after current line
                ...this.state.lines.slice(this.state.cursorLine + 1),
            ];
            this.state.cursorLine += insertedLines.length - 1;
            this.setCursorCol((insertedLines[insertedLines.length - 1] || "").length);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    // All the editor methods from before...
    insertCharacter(char, skipUndoCoalescing) {
        this.historyIndex = -1; // Exit history browsing mode
        // Undo coalescing (fish-style):
        // - Consecutive word chars coalesce into one undo unit
        // - Space captures state before itself (so undo removes space+following word together)
        // - Each space is separately undoable
        // Skip coalescing when called from atomic operations (e.g., handlePaste)
        if (!skipUndoCoalescing) {
            if (isWhitespaceChar(char) || this.lastAction !== "type-word") {
                this.pushUndoSnapshot();
            }
            this.lastAction = "type-word";
        }
        const line = this.state.lines[this.state.cursorLine] || "";
        const before = line.slice(0, this.state.cursorCol);
        const after = line.slice(this.state.cursorCol);
        this.state.lines[this.state.cursorLine] = before + char + after;
        this.setCursorCol(this.state.cursorCol + char.length);
        if (this.onChange) {
            this.onChange(this.getText());
        }
        // Check if we should trigger or update autocomplete
        if (!this.autocompleteState) {
            // Auto-trigger for "/" at the start of a line (slash commands)
            if (char === "/" && this.isAtStartOfMessage()) {
                this.tryTriggerAutocomplete();
            }
            // Auto-trigger for "@" file reference (fuzzy search)
            else if (char === "@") {
                const currentLine = this.state.lines[this.state.cursorLine] || "";
                const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
                // Only trigger if @ is after whitespace or at start of line
                const charBeforeAt = textBeforeCursor[textBeforeCursor.length - 2];
                if (textBeforeCursor.length === 1 || charBeforeAt === " " || charBeforeAt === "\t") {
                    this.tryTriggerAutocomplete();
                }
            }
            // Also auto-trigger when typing letters in a slash command context
            else if (/[a-zA-Z0-9.\-_]/.test(char)) {
                const currentLine = this.state.lines[this.state.cursorLine] || "";
                const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
                // Check if we're in a slash command (with or without space for arguments)
                if (this.isInSlashCommandContext(textBeforeCursor)) {
                    this.tryTriggerAutocomplete();
                }
                // Check if we're in an @ file reference context
                else if (textBeforeCursor.match(/(?:^|[\s])@[^\s]*$/)) {
                    this.tryTriggerAutocomplete();
                }
            }
        }
        else {
            this.updateAutocomplete();
        }
    }
    handlePaste(pastedText) {
        this.cancelAutocomplete();
        this.historyIndex = -1; // Exit history browsing mode
        this.lastAction = null;
        this.pushUndoSnapshot();
        // Clean the pasted text: normalize line endings, expand tabs
        const cleanText = this.normalizeText(pastedText);
        // Filter out non-printable characters except newlines
        let filteredText = cleanText
            .split("")
            .filter((char) => char === "\n" || char.charCodeAt(0) >= 32)
            .join("");
        // If pasting a file path (starts with /, ~, or .) and the character before
        // the cursor is a word character, prepend a space for better readability
        if (/^[/~.]/.test(filteredText)) {
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const charBeforeCursor = this.state.cursorCol > 0 ? currentLine[this.state.cursorCol - 1] : "";
            if (charBeforeCursor && /\w/.test(charBeforeCursor)) {
                filteredText = ` ${filteredText}`;
            }
        }
        // Split into lines to check for large paste
        const pastedLines = filteredText.split("\n");
        // Check if this is a large paste (> 10 lines or > 1000 characters)
        const totalChars = filteredText.length;
        if (pastedLines.length > 10 || totalChars > 1000) {
            // Store the paste and insert a marker
            this.pasteCounter++;
            const pasteId = this.pasteCounter;
            this.pastes.set(pasteId, filteredText);
            // Insert marker like "[paste #1 +123 lines]" or "[paste #1 1234 chars]"
            const marker = pastedLines.length > 10
                ? `[paste #${pasteId} +${pastedLines.length} lines]`
                : `[paste #${pasteId} ${totalChars} chars]`;
            this.insertTextAtCursorInternal(marker);
            return;
        }
        if (pastedLines.length === 1) {
            // Single line - insert atomically (do not trigger autocomplete during paste)
            this.insertTextAtCursorInternal(filteredText);
            return;
        }
        // Multi-line paste - use direct state manipulation
        this.insertTextAtCursorInternal(filteredText);
    }
    addNewLine() {
        this.cancelAutocomplete();
        this.historyIndex = -1; // Exit history browsing mode
        this.lastAction = null;
        this.pushUndoSnapshot();
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        const before = currentLine.slice(0, this.state.cursorCol);
        const after = currentLine.slice(this.state.cursorCol);
        // Split current line
        this.state.lines[this.state.cursorLine] = before;
        this.state.lines.splice(this.state.cursorLine + 1, 0, after);
        // Move cursor to start of new line
        this.state.cursorLine++;
        this.setCursorCol(0);
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    shouldSubmitOnBackslashEnter(data, kb) {
        if (this.disableSubmit)
            return false;
        if (!matchesKey(data, "enter"))
            return false;
        const submitKeys = kb.getKeys("tui.input.submit");
        const hasShiftEnter = submitKeys.includes("shift+enter") || submitKeys.includes("shift+return");
        if (!hasShiftEnter)
            return false;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        return this.state.cursorCol > 0 && currentLine[this.state.cursorCol - 1] === "\\";
    }
    submitValue() {
        this.cancelAutocomplete();
        const result = this.expandPasteMarkers(this.state.lines.join("\n")).trim();
        this.state = { lines: [""], cursorLine: 0, cursorCol: 0 };
        this.pastes.clear();
        this.pasteCounter = 0;
        this.historyIndex = -1;
        this.scrollOffset = 0;
        this.undoStack.clear();
        this.lastAction = null;
        if (this.onChange)
            this.onChange("");
        if (this.onSubmit)
            this.onSubmit(result);
    }
    handleBackspace() {
        this.historyIndex = -1; // Exit history browsing mode
        this.lastAction = null;
        if (this.state.cursorCol > 0) {
            this.pushUndoSnapshot();
            // Delete grapheme before cursor (handles emojis, combining characters, etc.)
            const line = this.state.lines[this.state.cursorLine] || "";
            const beforeCursor = line.slice(0, this.state.cursorCol);
            // Find the last grapheme in the text before cursor
            const graphemes = [...this.segment(beforeCursor)];
            const lastGrapheme = graphemes[graphemes.length - 1];
            const graphemeLength = lastGrapheme ? lastGrapheme.segment.length : 1;
            const before = line.slice(0, this.state.cursorCol - graphemeLength);
            const after = line.slice(this.state.cursorCol);
            this.state.lines[this.state.cursorLine] = before + after;
            this.setCursorCol(this.state.cursorCol - graphemeLength);
        }
        else if (this.state.cursorLine > 0) {
            this.pushUndoSnapshot();
            // Merge with previous line
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const previousLine = this.state.lines[this.state.cursorLine - 1] || "";
            this.state.lines[this.state.cursorLine - 1] = previousLine + currentLine;
            this.state.lines.splice(this.state.cursorLine, 1);
            this.state.cursorLine--;
            this.setCursorCol(previousLine.length);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
        // Update or re-trigger autocomplete after backspace
        if (this.autocompleteState) {
            this.updateAutocomplete();
        }
        else {
            // If autocomplete was cancelled (no matches), re-trigger if we're in a completable context
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
            // Slash command context
            if (this.isInSlashCommandContext(textBeforeCursor)) {
                this.tryTriggerAutocomplete();
            }
            // @ file reference context
            else if (textBeforeCursor.match(/(?:^|[\s])@[^\s]*$/)) {
                this.tryTriggerAutocomplete();
            }
        }
    }
    /**
     * Set cursor column and clear preferredVisualCol.
     * Use this for all non-vertical cursor movements to reset sticky column behavior.
     */
    setCursorCol(col) {
        this.state.cursorCol = col;
        this.preferredVisualCol = null;
    }
    /**
     * Move cursor to a target visual line, applying sticky column logic.
     * Shared by moveCursor() and pageScroll().
     */
    moveToVisualLine(visualLines, currentVisualLine, targetVisualLine) {
        const currentVL = visualLines[currentVisualLine];
        const targetVL = visualLines[targetVisualLine];
        if (currentVL && targetVL) {
            const currentVisualCol = this.state.cursorCol - currentVL.startCol;
            // For non-last segments, clamp to length-1 to stay within the segment
            const isLastSourceSegment = currentVisualLine === visualLines.length - 1 ||
                visualLines[currentVisualLine + 1]?.logicalLine !== currentVL.logicalLine;
            const sourceMaxVisualCol = isLastSourceSegment ? currentVL.length : Math.max(0, currentVL.length - 1);
            const isLastTargetSegment = targetVisualLine === visualLines.length - 1 ||
                visualLines[targetVisualLine + 1]?.logicalLine !== targetVL.logicalLine;
            const targetMaxVisualCol = isLastTargetSegment ? targetVL.length : Math.max(0, targetVL.length - 1);
            const moveToVisualCol = this.computeVerticalMoveColumn(currentVisualCol, sourceMaxVisualCol, targetMaxVisualCol);
            // Set cursor position
            this.state.cursorLine = targetVL.logicalLine;
            const targetCol = targetVL.startCol + moveToVisualCol;
            const logicalLine = this.state.lines[targetVL.logicalLine] || "";
            this.state.cursorCol = Math.min(targetCol, logicalLine.length);
            // Snap cursor to atomic segment boundary (e.g. paste markers)
            // so the cursor never lands in the middle of a multi-grapheme unit.
            // Single-grapheme segments don't need snapping.
            const segments = [...this.segment(logicalLine)];
            for (const seg of segments) {
                if (seg.index > this.state.cursorCol)
                    break;
                if (seg.segment.length <= 1)
                    continue;
                if (this.state.cursorCol < seg.index + seg.segment.length) {
                    // jump to the start of the segment when moving up, to the end when moving down.
                    this.state.cursorCol = currentVisualLine > targetVisualLine ? seg.index : seg.index + seg.segment.length;
                    break;
                }
            }
        }
    }
    /**
     * Compute the target visual column for vertical cursor movement.
     * Implements the sticky column decision table:
     *
     * | P | S | T | U | Scenario                                             | Set Preferred | Move To     |
     * |---|---|---|---| ---------------------------------------------------- |---------------|-------------|
     * | 0 | * | 0 | - | Start nav, target fits                               | null          | current     |
     * | 0 | * | 1 | - | Start nav, target shorter                            | current       | target end  |
     * | 1 | 0 | 0 | 0 | Clamped, target fits preferred                       | null          | preferred   |
     * | 1 | 0 | 0 | 1 | Clamped, target longer but still can't fit preferred | keep          | target end  |
     * | 1 | 0 | 1 | - | Clamped, target even shorter                         | keep          | target end  |
     * | 1 | 1 | 0 | - | Rewrapped, target fits current                       | null          | current     |
     * | 1 | 1 | 1 | - | Rewrapped, target shorter than current               | current       | target end  |
     *
     * Where:
     * - P = preferred col is set
     * - S = cursor in middle of source line (not clamped to end)
     * - T = target line shorter than current visual col
     * - U = target line shorter than preferred col
     */
    computeVerticalMoveColumn(currentVisualCol, sourceMaxVisualCol, targetMaxVisualCol) {
        const hasPreferred = this.preferredVisualCol !== null; // P
        const cursorInMiddle = currentVisualCol < sourceMaxVisualCol; // S
        const targetTooShort = targetMaxVisualCol < currentVisualCol; // T
        if (!hasPreferred || cursorInMiddle) {
            if (targetTooShort) {
                // Cases 2 and 7
                this.preferredVisualCol = currentVisualCol;
                return targetMaxVisualCol;
            }
            // Cases 1 and 6
            this.preferredVisualCol = null;
            return currentVisualCol;
        }
        const targetCantFitPreferred = targetMaxVisualCol < this.preferredVisualCol; // U
        if (targetTooShort || targetCantFitPreferred) {
            // Cases 4 and 5
            return targetMaxVisualCol;
        }
        // Case 3
        const result = this.preferredVisualCol;
        this.preferredVisualCol = null;
        return result;
    }
    moveToLineStart() {
        this.lastAction = null;
        this.setCursorCol(0);
    }
    moveToLineEnd() {
        this.lastAction = null;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        this.setCursorCol(currentLine.length);
    }
    deleteToStartOfLine() {
        this.historyIndex = -1; // Exit history browsing mode
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        if (this.state.cursorCol > 0) {
            this.pushUndoSnapshot();
            // Calculate text to be deleted and save to kill ring (backward deletion = prepend)
            const deletedText = currentLine.slice(0, this.state.cursorCol);
            this.killRing.push(deletedText, { prepend: true, accumulate: this.lastAction === "kill" });
            this.lastAction = "kill";
            // Delete from start of line up to cursor
            this.state.lines[this.state.cursorLine] = currentLine.slice(this.state.cursorCol);
            this.setCursorCol(0);
        }
        else if (this.state.cursorLine > 0) {
            this.pushUndoSnapshot();
            // At start of line - merge with previous line, treating newline as deleted text
            this.killRing.push("\n", { prepend: true, accumulate: this.lastAction === "kill" });
            this.lastAction = "kill";
            const previousLine = this.state.lines[this.state.cursorLine - 1] || "";
            this.state.lines[this.state.cursorLine - 1] = previousLine + currentLine;
            this.state.lines.splice(this.state.cursorLine, 1);
            this.state.cursorLine--;
            this.setCursorCol(previousLine.length);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    deleteToEndOfLine() {
        this.historyIndex = -1; // Exit history browsing mode
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        if (this.state.cursorCol < currentLine.length) {
            this.pushUndoSnapshot();
            // Calculate text to be deleted and save to kill ring (forward deletion = append)
            const deletedText = currentLine.slice(this.state.cursorCol);
            this.killRing.push(deletedText, { prepend: false, accumulate: this.lastAction === "kill" });
            this.lastAction = "kill";
            // Delete from cursor to end of line
            this.state.lines[this.state.cursorLine] = currentLine.slice(0, this.state.cursorCol);
        }
        else if (this.state.cursorLine < this.state.lines.length - 1) {
            this.pushUndoSnapshot();
            // At end of line - merge with next line, treating newline as deleted text
            this.killRing.push("\n", { prepend: false, accumulate: this.lastAction === "kill" });
            this.lastAction = "kill";
            const nextLine = this.state.lines[this.state.cursorLine + 1] || "";
            this.state.lines[this.state.cursorLine] = currentLine + nextLine;
            this.state.lines.splice(this.state.cursorLine + 1, 1);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    deleteWordBackwards() {
        this.historyIndex = -1; // Exit history browsing mode
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        // If at start of line, behave like backspace at column 0 (merge with previous line)
        if (this.state.cursorCol === 0) {
            if (this.state.cursorLine > 0) {
                this.pushUndoSnapshot();
                // Treat newline as deleted text (backward deletion = prepend)
                this.killRing.push("\n", { prepend: true, accumulate: this.lastAction === "kill" });
                this.lastAction = "kill";
                const previousLine = this.state.lines[this.state.cursorLine - 1] || "";
                this.state.lines[this.state.cursorLine - 1] = previousLine + currentLine;
                this.state.lines.splice(this.state.cursorLine, 1);
                this.state.cursorLine--;
                this.setCursorCol(previousLine.length);
            }
        }
        else {
            this.pushUndoSnapshot();
            // Save lastAction before cursor movement (moveWordBackwards resets it)
            const wasKill = this.lastAction === "kill";
            const oldCursorCol = this.state.cursorCol;
            this.moveWordBackwards();
            const deleteFrom = this.state.cursorCol;
            this.setCursorCol(oldCursorCol);
            const deletedText = currentLine.slice(deleteFrom, this.state.cursorCol);
            this.killRing.push(deletedText, { prepend: true, accumulate: wasKill });
            this.lastAction = "kill";
            this.state.lines[this.state.cursorLine] =
                currentLine.slice(0, deleteFrom) + currentLine.slice(this.state.cursorCol);
            this.setCursorCol(deleteFrom);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    deleteWordForward() {
        this.historyIndex = -1; // Exit history browsing mode
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        // If at end of line, merge with next line (delete the newline)
        if (this.state.cursorCol >= currentLine.length) {
            if (this.state.cursorLine < this.state.lines.length - 1) {
                this.pushUndoSnapshot();
                // Treat newline as deleted text (forward deletion = append)
                this.killRing.push("\n", { prepend: false, accumulate: this.lastAction === "kill" });
                this.lastAction = "kill";
                const nextLine = this.state.lines[this.state.cursorLine + 1] || "";
                this.state.lines[this.state.cursorLine] = currentLine + nextLine;
                this.state.lines.splice(this.state.cursorLine + 1, 1);
            }
        }
        else {
            this.pushUndoSnapshot();
            // Save lastAction before cursor movement (moveWordForwards resets it)
            const wasKill = this.lastAction === "kill";
            const oldCursorCol = this.state.cursorCol;
            this.moveWordForwards();
            const deleteTo = this.state.cursorCol;
            this.setCursorCol(oldCursorCol);
            const deletedText = currentLine.slice(this.state.cursorCol, deleteTo);
            this.killRing.push(deletedText, { prepend: false, accumulate: wasKill });
            this.lastAction = "kill";
            this.state.lines[this.state.cursorLine] =
                currentLine.slice(0, this.state.cursorCol) + currentLine.slice(deleteTo);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    handleForwardDelete() {
        this.historyIndex = -1; // Exit history browsing mode
        this.lastAction = null;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        if (this.state.cursorCol < currentLine.length) {
            this.pushUndoSnapshot();
            // Delete grapheme at cursor position (handles emojis, combining characters, etc.)
            const afterCursor = currentLine.slice(this.state.cursorCol);
            // Find the first grapheme at cursor
            const graphemes = [...this.segment(afterCursor)];
            const firstGrapheme = graphemes[0];
            const graphemeLength = firstGrapheme ? firstGrapheme.segment.length : 1;
            const before = currentLine.slice(0, this.state.cursorCol);
            const after = currentLine.slice(this.state.cursorCol + graphemeLength);
            this.state.lines[this.state.cursorLine] = before + after;
        }
        else if (this.state.cursorLine < this.state.lines.length - 1) {
            this.pushUndoSnapshot();
            // At end of line - merge with next line
            const nextLine = this.state.lines[this.state.cursorLine + 1] || "";
            this.state.lines[this.state.cursorLine] = currentLine + nextLine;
            this.state.lines.splice(this.state.cursorLine + 1, 1);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
        // Update or re-trigger autocomplete after forward delete
        if (this.autocompleteState) {
            this.updateAutocomplete();
        }
        else {
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
            // Slash command context
            if (this.isInSlashCommandContext(textBeforeCursor)) {
                this.tryTriggerAutocomplete();
            }
            // @ file reference context
            else if (textBeforeCursor.match(/(?:^|[\s])@[^\s]*$/)) {
                this.tryTriggerAutocomplete();
            }
        }
    }
    /**
     * Build a mapping from visual lines to logical positions.
     * Returns an array where each element represents a visual line with:
     * - logicalLine: index into this.state.lines
     * - startCol: starting column in the logical line
     * - length: length of this visual line segment
     */
    buildVisualLineMap(width) {
        const visualLines = [];
        for (let i = 0; i < this.state.lines.length; i++) {
            const line = this.state.lines[i] || "";
            const lineVisWidth = visibleWidth(line);
            if (line.length === 0) {
                // Empty line still takes one visual line
                visualLines.push({ logicalLine: i, startCol: 0, length: 0 });
            }
            else if (lineVisWidth <= width) {
                visualLines.push({ logicalLine: i, startCol: 0, length: line.length });
            }
            else {
                // Line needs wrapping - use word-aware wrapping
                const chunks = wordWrapLine(line, width, [...this.segment(line)]);
                for (const chunk of chunks) {
                    visualLines.push({
                        logicalLine: i,
                        startCol: chunk.startIndex,
                        length: chunk.endIndex - chunk.startIndex,
                    });
                }
            }
        }
        return visualLines;
    }
    /**
     * Find the visual line index for the current cursor position.
     */
    findCurrentVisualLine(visualLines) {
        for (let i = 0; i < visualLines.length; i++) {
            const vl = visualLines[i];
            if (!vl)
                continue;
            if (vl.logicalLine === this.state.cursorLine) {
                const colInSegment = this.state.cursorCol - vl.startCol;
                // Cursor is in this segment if it's within range
                // For the last segment of a logical line, cursor can be at length (end position)
                const isLastSegmentOfLine = i === visualLines.length - 1 || visualLines[i + 1]?.logicalLine !== vl.logicalLine;
                if (colInSegment >= 0 && (colInSegment < vl.length || (isLastSegmentOfLine && colInSegment <= vl.length))) {
                    return i;
                }
            }
        }
        // Fallback: return last visual line
        return visualLines.length - 1;
    }
    moveCursor(deltaLine, deltaCol) {
        this.lastAction = null;
        const visualLines = this.buildVisualLineMap(this.lastWidth);
        const currentVisualLine = this.findCurrentVisualLine(visualLines);
        if (deltaLine !== 0) {
            const targetVisualLine = currentVisualLine + deltaLine;
            if (targetVisualLine >= 0 && targetVisualLine < visualLines.length) {
                this.moveToVisualLine(visualLines, currentVisualLine, targetVisualLine);
            }
        }
        if (deltaCol !== 0) {
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            if (deltaCol > 0) {
                // Moving right - move by one grapheme (handles emojis, combining characters, etc.)
                if (this.state.cursorCol < currentLine.length) {
                    const afterCursor = currentLine.slice(this.state.cursorCol);
                    const graphemes = [...this.segment(afterCursor)];
                    const firstGrapheme = graphemes[0];
                    this.setCursorCol(this.state.cursorCol + (firstGrapheme ? firstGrapheme.segment.length : 1));
                }
                else if (this.state.cursorLine < this.state.lines.length - 1) {
                    // Wrap to start of next logical line
                    this.state.cursorLine++;
                    this.setCursorCol(0);
                }
                else {
                    // At end of last line - can't move, but set preferredVisualCol for up/down navigation
                    const currentVL = visualLines[currentVisualLine];
                    if (currentVL) {
                        this.preferredVisualCol = this.state.cursorCol - currentVL.startCol;
                    }
                }
            }
            else {
                // Moving left - move by one grapheme (handles emojis, combining characters, etc.)
                if (this.state.cursorCol > 0) {
                    const beforeCursor = currentLine.slice(0, this.state.cursorCol);
                    const graphemes = [...this.segment(beforeCursor)];
                    const lastGrapheme = graphemes[graphemes.length - 1];
                    this.setCursorCol(this.state.cursorCol - (lastGrapheme ? lastGrapheme.segment.length : 1));
                }
                else if (this.state.cursorLine > 0) {
                    // Wrap to end of previous logical line
                    this.state.cursorLine--;
                    const prevLine = this.state.lines[this.state.cursorLine] || "";
                    this.setCursorCol(prevLine.length);
                }
            }
        }
    }
    /**
     * Scroll by a page (direction: -1 for up, 1 for down).
     * Moves cursor by the page size while keeping it in bounds.
     */
    pageScroll(direction) {
        this.lastAction = null;
        const terminalRows = this.tui.terminal.rows;
        const pageSize = Math.max(5, Math.floor(terminalRows * 0.3));
        const visualLines = this.buildVisualLineMap(this.lastWidth);
        const currentVisualLine = this.findCurrentVisualLine(visualLines);
        const targetVisualLine = Math.max(0, Math.min(visualLines.length - 1, currentVisualLine + direction * pageSize));
        this.moveToVisualLine(visualLines, currentVisualLine, targetVisualLine);
    }
    moveWordBackwards() {
        this.lastAction = null;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        // If at start of line, move to end of previous line
        if (this.state.cursorCol === 0) {
            if (this.state.cursorLine > 0) {
                this.state.cursorLine--;
                const prevLine = this.state.lines[this.state.cursorLine] || "";
                this.setCursorCol(prevLine.length);
            }
            return;
        }
        const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
        const graphemes = [...this.segment(textBeforeCursor)];
        let newCol = this.state.cursorCol;
        // Skip trailing whitespace
        while (graphemes.length > 0 &&
            !isPasteMarker(graphemes[graphemes.length - 1]?.segment || "") &&
            isWhitespaceChar(graphemes[graphemes.length - 1]?.segment || "")) {
            newCol -= graphemes.pop()?.segment.length || 0;
        }
        if (graphemes.length > 0) {
            const lastGrapheme = graphemes[graphemes.length - 1]?.segment || "";
            if (isPasteMarker(lastGrapheme)) {
                // Paste marker is a single atomic word
                newCol -= graphemes.pop()?.segment.length || 0;
            }
            else if (isPunctuationChar(lastGrapheme)) {
                // Skip punctuation run
                while (graphemes.length > 0 &&
                    isPunctuationChar(graphemes[graphemes.length - 1]?.segment || "") &&
                    !isPasteMarker(graphemes[graphemes.length - 1]?.segment || "")) {
                    newCol -= graphemes.pop()?.segment.length || 0;
                }
            }
            else {
                // Skip word run
                while (graphemes.length > 0 &&
                    !isWhitespaceChar(graphemes[graphemes.length - 1]?.segment || "") &&
                    !isPunctuationChar(graphemes[graphemes.length - 1]?.segment || "") &&
                    !isPasteMarker(graphemes[graphemes.length - 1]?.segment || "")) {
                    newCol -= graphemes.pop()?.segment.length || 0;
                }
            }
        }
        this.setCursorCol(newCol);
    }
    /**
     * Yank (paste) the most recent kill ring entry at cursor position.
     */
    yank() {
        if (this.killRing.length === 0)
            return;
        this.pushUndoSnapshot();
        const text = this.killRing.peek();
        this.insertYankedText(text);
        this.lastAction = "yank";
    }
    /**
     * Cycle through kill ring (only works immediately after yank or yank-pop).
     * Replaces the last yanked text with the previous entry in the ring.
     */
    yankPop() {
        // Only works if we just yanked and have more than one entry
        if (this.lastAction !== "yank" || this.killRing.length <= 1)
            return;
        this.pushUndoSnapshot();
        // Delete the previously yanked text (still at end of ring before rotation)
        this.deleteYankedText();
        // Rotate the ring: move end to front
        this.killRing.rotate();
        // Insert the new most recent entry (now at end after rotation)
        const text = this.killRing.peek();
        this.insertYankedText(text);
        this.lastAction = "yank";
    }
    /**
     * Insert text at cursor position (used by yank operations).
     */
    insertYankedText(text) {
        this.historyIndex = -1; // Exit history browsing mode
        const lines = text.split("\n");
        if (lines.length === 1) {
            // Single line - insert at cursor
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const before = currentLine.slice(0, this.state.cursorCol);
            const after = currentLine.slice(this.state.cursorCol);
            this.state.lines[this.state.cursorLine] = before + text + after;
            this.setCursorCol(this.state.cursorCol + text.length);
        }
        else {
            // Multi-line insert
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const before = currentLine.slice(0, this.state.cursorCol);
            const after = currentLine.slice(this.state.cursorCol);
            // First line merges with text before cursor
            this.state.lines[this.state.cursorLine] = before + (lines[0] || "");
            // Insert middle lines
            for (let i = 1; i < lines.length - 1; i++) {
                this.state.lines.splice(this.state.cursorLine + i, 0, lines[i] || "");
            }
            // Last line merges with text after cursor
            const lastLineIndex = this.state.cursorLine + lines.length - 1;
            this.state.lines.splice(lastLineIndex, 0, (lines[lines.length - 1] || "") + after);
            // Update cursor position
            this.state.cursorLine = lastLineIndex;
            this.setCursorCol((lines[lines.length - 1] || "").length);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    /**
     * Delete the previously yanked text (used by yank-pop).
     * The yanked text is derived from killRing[end] since it hasn't been rotated yet.
     */
    deleteYankedText() {
        const yankedText = this.killRing.peek();
        if (!yankedText)
            return;
        const yankLines = yankedText.split("\n");
        if (yankLines.length === 1) {
            // Single line - delete backward from cursor
            const currentLine = this.state.lines[this.state.cursorLine] || "";
            const deleteLen = yankedText.length;
            const before = currentLine.slice(0, this.state.cursorCol - deleteLen);
            const after = currentLine.slice(this.state.cursorCol);
            this.state.lines[this.state.cursorLine] = before + after;
            this.setCursorCol(this.state.cursorCol - deleteLen);
        }
        else {
            // Multi-line delete - cursor is at end of last yanked line
            const startLine = this.state.cursorLine - (yankLines.length - 1);
            const startCol = (this.state.lines[startLine] || "").length - (yankLines[0] || "").length;
            // Get text after cursor on current line
            const afterCursor = (this.state.lines[this.state.cursorLine] || "").slice(this.state.cursorCol);
            // Get text before yank start position
            const beforeYank = (this.state.lines[startLine] || "").slice(0, startCol);
            // Remove all lines from startLine to cursorLine and replace with merged line
            this.state.lines.splice(startLine, yankLines.length, beforeYank + afterCursor);
            // Update cursor
            this.state.cursorLine = startLine;
            this.setCursorCol(startCol);
        }
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    pushUndoSnapshot() {
        this.undoStack.push(this.state);
    }
    undo() {
        this.historyIndex = -1; // Exit history browsing mode
        const snapshot = this.undoStack.pop();
        if (!snapshot)
            return;
        Object.assign(this.state, snapshot);
        this.lastAction = null;
        this.preferredVisualCol = null;
        if (this.onChange) {
            this.onChange(this.getText());
        }
    }
    /**
     * Jump to the first occurrence of a character in the specified direction.
     * Multi-line search. Case-sensitive. Skips the current cursor position.
     */
    jumpToChar(char, direction) {
        this.lastAction = null;
        const isForward = direction === "forward";
        const lines = this.state.lines;
        const end = isForward ? lines.length : -1;
        const step = isForward ? 1 : -1;
        for (let lineIdx = this.state.cursorLine; lineIdx !== end; lineIdx += step) {
            const line = lines[lineIdx] || "";
            const isCurrentLine = lineIdx === this.state.cursorLine;
            // Current line: start after/before cursor; other lines: search full line
            const searchFrom = isCurrentLine
                ? isForward
                    ? this.state.cursorCol + 1
                    : this.state.cursorCol - 1
                : undefined;
            const idx = isForward ? line.indexOf(char, searchFrom) : line.lastIndexOf(char, searchFrom);
            if (idx !== -1) {
                this.state.cursorLine = lineIdx;
                this.setCursorCol(idx);
                return;
            }
        }
        // No match found - cursor stays in place
    }
    moveWordForwards() {
        this.lastAction = null;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        // If at end of line, move to start of next line
        if (this.state.cursorCol >= currentLine.length) {
            if (this.state.cursorLine < this.state.lines.length - 1) {
                this.state.cursorLine++;
                this.setCursorCol(0);
            }
            return;
        }
        const textAfterCursor = currentLine.slice(this.state.cursorCol);
        const segments = this.segment(textAfterCursor);
        const iterator = segments[Symbol.iterator]();
        let next = iterator.next();
        let newCol = this.state.cursorCol;
        // Skip leading whitespace
        while (!next.done && !isPasteMarker(next.value.segment) && isWhitespaceChar(next.value.segment)) {
            newCol += next.value.segment.length;
            next = iterator.next();
        }
        if (!next.done) {
            const firstGrapheme = next.value.segment;
            if (isPasteMarker(firstGrapheme)) {
                // Paste marker is a single atomic word
                newCol += firstGrapheme.length;
            }
            else if (isPunctuationChar(firstGrapheme)) {
                // Skip punctuation run
                while (!next.done && isPunctuationChar(next.value.segment) && !isPasteMarker(next.value.segment)) {
                    newCol += next.value.segment.length;
                    next = iterator.next();
                }
            }
            else {
                // Skip word run
                while (!next.done &&
                    !isWhitespaceChar(next.value.segment) &&
                    !isPunctuationChar(next.value.segment) &&
                    !isPasteMarker(next.value.segment)) {
                    newCol += next.value.segment.length;
                    next = iterator.next();
                }
            }
        }
        this.setCursorCol(newCol);
    }
    // Slash menu only allowed on the first line of the editor
    isSlashMenuAllowed() {
        return this.state.cursorLine === 0;
    }
    // Helper method to check if cursor is at start of message (for slash command detection)
    isAtStartOfMessage() {
        if (!this.isSlashMenuAllowed())
            return false;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        const beforeCursor = currentLine.slice(0, this.state.cursorCol);
        return beforeCursor.trim() === "" || beforeCursor.trim() === "/";
    }
    isInSlashCommandContext(textBeforeCursor) {
        return this.isSlashMenuAllowed() && textBeforeCursor.trimStart().startsWith("/");
    }
    // Autocomplete methods
    /**
     * Find the best autocomplete item index for the given prefix.
     * Returns -1 if no match is found.
     *
     * Match priority:
     * 1. Exact match (prefix === item.value) -> always selected
     * 2. Prefix match -> first item whose value starts with prefix
     * 3. No match -> -1 (keep default highlight)
     *
     * Matching is case-sensitive and checks item.value only.
     */
    getBestAutocompleteMatchIndex(items, prefix) {
        if (!prefix)
            return -1;
        let firstPrefixIndex = -1;
        for (let i = 0; i < items.length; i++) {
            const value = items[i].value;
            if (value === prefix) {
                return i; // Exact match always wins
            }
            if (firstPrefixIndex === -1 && value.startsWith(prefix)) {
                firstPrefixIndex = i;
            }
        }
        return firstPrefixIndex;
    }
    createAutocompleteList(prefix, items) {
        const layout = prefix.startsWith("/") ? SLASH_COMMAND_SELECT_LIST_LAYOUT : undefined;
        return new SelectList(items, this.autocompleteMaxVisible, this.theme.selectList, layout);
    }
    tryTriggerAutocomplete(explicitTab = false) {
        this.requestAutocomplete({ force: false, explicitTab });
    }
    handleTabCompletion() {
        if (!this.autocompleteProvider)
            return;
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        const beforeCursor = currentLine.slice(0, this.state.cursorCol);
        if (this.isInSlashCommandContext(beforeCursor) && !beforeCursor.trimStart().includes(" ")) {
            this.handleSlashCommandCompletion();
        }
        else {
            this.forceFileAutocomplete(true);
        }
    }
    handleSlashCommandCompletion() {
        this.requestAutocomplete({ force: false, explicitTab: true });
    }
    forceFileAutocomplete(explicitTab = false) {
        this.requestAutocomplete({ force: true, explicitTab });
    }
    requestAutocomplete(options) {
        if (!this.autocompleteProvider)
            return;
        if (options.force) {
            const provider = this.autocompleteProvider;
            const shouldTrigger = !provider.shouldTriggerFileCompletion ||
                provider.shouldTriggerFileCompletion(this.state.lines, this.state.cursorLine, this.state.cursorCol);
            if (!shouldTrigger) {
                return;
            }
        }
        this.cancelAutocompleteRequest();
        const startToken = ++this.autocompleteStartToken;
        const debounceMs = this.getAutocompleteDebounceMs(options);
        if (debounceMs > 0) {
            this.autocompleteDebounceTimer = setTimeout(() => {
                this.autocompleteDebounceTimer = undefined;
                void this.startAutocompleteRequest(startToken, options);
            }, debounceMs);
            return;
        }
        void this.startAutocompleteRequest(startToken, options);
    }
    async startAutocompleteRequest(startToken, options) {
        const previousTask = this.autocompleteRequestTask;
        this.autocompleteRequestTask = (async () => {
            await previousTask;
            if (startToken !== this.autocompleteStartToken || !this.autocompleteProvider) {
                return;
            }
            const controller = new AbortController();
            this.autocompleteAbort = controller;
            const requestId = ++this.autocompleteRequestId;
            const snapshotText = this.getText();
            const snapshotLine = this.state.cursorLine;
            const snapshotCol = this.state.cursorCol;
            await this.runAutocompleteRequest(requestId, controller, snapshotText, snapshotLine, snapshotCol, options);
        })();
        await this.autocompleteRequestTask;
    }
    getAutocompleteDebounceMs(options) {
        if (options.explicitTab || options.force) {
            return 0;
        }
        const currentLine = this.state.lines[this.state.cursorLine] || "";
        const textBeforeCursor = currentLine.slice(0, this.state.cursorCol);
        const isAttachmentContext = /(?:^|[ \t])@(?:"[^"]*|[^\s]*)$/.test(textBeforeCursor);
        return isAttachmentContext ? ATTACHMENT_AUTOCOMPLETE_DEBOUNCE_MS : 0;
    }
    async runAutocompleteRequest(requestId, controller, snapshotText, snapshotLine, snapshotCol, options) {
        if (!this.autocompleteProvider)
            return;
        const suggestions = await this.autocompleteProvider.getSuggestions(this.state.lines, this.state.cursorLine, this.state.cursorCol, { signal: controller.signal, force: options.force });
        if (!this.isAutocompleteRequestCurrent(requestId, controller, snapshotText, snapshotLine, snapshotCol)) {
            return;
        }
        this.autocompleteAbort = undefined;
        if (!suggestions || !Array.isArray(suggestions.items) || suggestions.items.length === 0) {
            this.cancelAutocomplete();
            this.tui.requestRender();
            return;
        }
        if (options.force && options.explicitTab && suggestions.items.length === 1) {
            const item = suggestions.items[0];
            this.pushUndoSnapshot();
            this.lastAction = null;
            const result = this.autocompleteProvider.applyCompletion(this.state.lines, this.state.cursorLine, this.state.cursorCol, item, suggestions.prefix);
            this.state.lines = result.lines;
            this.state.cursorLine = result.cursorLine;
            this.setCursorCol(result.cursorCol);
            if (this.onChange)
                this.onChange(this.getText());
            this.tui.requestRender();
            return;
        }
        this.applyAutocompleteSuggestions(suggestions, options.force ? "force" : "regular");
        this.tui.requestRender();
    }
    isAutocompleteRequestCurrent(requestId, controller, snapshotText, snapshotLine, snapshotCol) {
        return (!controller.signal.aborted &&
            requestId === this.autocompleteRequestId &&
            this.getText() === snapshotText &&
            this.state.cursorLine === snapshotLine &&
            this.state.cursorCol === snapshotCol);
    }
    applyAutocompleteSuggestions(suggestions, state) {
        this.autocompletePrefix = suggestions.prefix;
        this.autocompleteList = this.createAutocompleteList(suggestions.prefix, suggestions.items);
        const bestMatchIndex = this.getBestAutocompleteMatchIndex(suggestions.items, suggestions.prefix);
        if (bestMatchIndex >= 0) {
            this.autocompleteList.setSelectedIndex(bestMatchIndex);
        }
        this.autocompleteState = state;
    }
    cancelAutocompleteRequest() {
        this.autocompleteStartToken += 1;
        if (this.autocompleteDebounceTimer) {
            clearTimeout(this.autocompleteDebounceTimer);
            this.autocompleteDebounceTimer = undefined;
        }
        this.autocompleteAbort?.abort();
        this.autocompleteAbort = undefined;
    }
    clearAutocompleteUi() {
        this.autocompleteState = null;
        this.autocompleteList = undefined;
        this.autocompletePrefix = "";
    }
    cancelAutocomplete() {
        this.cancelAutocompleteRequest();
        this.clearAutocompleteUi();
    }
    isShowingAutocomplete() {
        return this.autocompleteState !== null;
    }
    updateAutocomplete() {
        if (!this.autocompleteState || !this.autocompleteProvider)
            return;
        this.requestAutocomplete({ force: this.autocompleteState === "force", explicitTab: false });
    }
}
//# sourceMappingURL=editor.js.map