/**
 * Text selection state for fullscreen mode.
 *
 * Tracks a linear selection in screen-buffer coordinates (0-indexed col/row).
 * Selection is line-based: cells from (startCol, startRow) through
 * (endCol, endRow) inclusive, wrapping across line boundaries. This matches
 * terminal-native selection behavior (not rectangular/block).
 *
 * The selection is stored as ANCHOR (where the drag started) + FOCUS (where
 * the cursor is now). The rendered highlight normalizes to start ≤ end.
 */
import { clamp } from './layout/geometry.js';
import { cellAt, cellAtIndex, setCellStyleId } from './screen.js';
export function createSelectionState() {
    return {
        anchor: null,
        focus: null,
        isDragging: false,
        anchorSpan: null,
        scrolledOffAbove: [],
        scrolledOffBelow: [],
        scrolledOffAboveSW: [],
        scrolledOffBelowSW: [],
        lastPressHadAlt: false,
    };
}
export function startSelection(s, col, row) {
    s.anchor = { col, row };
    // Focus is not set until the first drag motion. A click-release with no
    // drag leaves focus null → hasSelection/selectionBounds return false/null
    // via the `!s.focus` check, so a bare click never highlights a cell.
    s.focus = null;
    s.isDragging = true;
    s.anchorSpan = null;
    s.scrolledOffAbove = [];
    s.scrolledOffBelow = [];
    s.scrolledOffAboveSW = [];
    s.scrolledOffBelowSW = [];
    s.virtualAnchorRow = undefined;
    s.virtualFocusRow = undefined;
    s.lastPressHadAlt = false;
}
export function updateSelection(s, col, row) {
    if (!s.isDragging)
        return;
    // First motion at the same cell as anchor is a no-op. Terminals in mode
    // 1002 can fire a drag event at the anchor cell (sub-pixel tremor, or a
    // motion-release pair). Setting focus here would turn a bare click into
    // a 1-cell selection and clobber the clipboard via useCopyOnSelect. Once
    // focus is set (real drag), we track normally including back to anchor.
    if (!s.focus && s.anchor && s.anchor.col === col && s.anchor.row === row)
        return;
    s.focus = { col, row };
}
export function finishSelection(s) {
    s.isDragging = false;
    // Keep anchor/focus so highlight stays visible and text can be copied.
    // Clear via clearSelection() on Esc or after copy.
}
export function clearSelection(s) {
    s.anchor = null;
    s.focus = null;
    s.isDragging = false;
    s.anchorSpan = null;
    s.scrolledOffAbove = [];
    s.scrolledOffBelow = [];
    s.scrolledOffAboveSW = [];
    s.scrolledOffBelowSW = [];
    s.virtualAnchorRow = undefined;
    s.virtualFocusRow = undefined;
    s.lastPressHadAlt = false;
}
// Unicode-aware word character matcher: letters (any script), digits,
// and the punctuation set iTerm2 treats as word-part by default.
// Matching iTerm2's default means double-clicking a path like
// `/usr/bin/bash` or `~/.config/owlcoda/config.json` selects the whole thing,
// which is the muscle memory most macOS terminal users have.
// iTerm2 default "characters considered part of a word": /-+\~_.
const WORD_CHAR = /[\p{L}\p{N}_/.\-+~\\]/u;
/**
 * Character class for double-click word-expansion. Cells with the same
 * class as the clicked cell are included in the selection; a class change
 * is a boundary. Matches typical terminal-emulator behavior (iTerm2 etc.):
 * double-click on `foo` selects `foo`, on `->` selects `->`, on spaces
 * selects the whitespace run.
 */
function charClass(c) {
    if (c === ' ' || c === '')
        return 0;
    if (WORD_CHAR.test(c))
        return 1;
    return 2;
}
/**
 * Find the bounds of the same-class character run at (col, row). Returns
 * null if the click is out of bounds or lands on a noSelect cell. Used by
 * selectWordAt (initial double-click) and extendWordSelection (drag).
 */
function wordBoundsAt(screen, col, row) {
    if (row < 0 || row >= screen.height)
        return null;
    const width = screen.width;
    const noSelect = screen.noSelect;
    const rowOff = row * width;
    // If the click landed on the spacer tail of a wide char, step back to
    // the head so the class check sees the actual grapheme.
    let c = col;
    if (c > 0) {
        const cell = cellAt(screen, c, row);
        if (cell && cell.width === 2 /* CellWidth.SpacerTail */)
            c -= 1;
    }
    if (c < 0 || c >= width || noSelect[rowOff + c] === 1)
        return null;
    const startCell = cellAt(screen, c, row);
    if (!startCell)
        return null;
    const cls = charClass(startCell.char);
    // Expand left: include cells of the same class, stop at noSelect or
    // class change. SpacerTail cells are stepped over (the wide-char head
    // at the preceding column determines the class).
    let lo = c;
    while (lo > 0) {
        const prev = lo - 1;
        if (noSelect[rowOff + prev] === 1)
            break;
        const pc = cellAt(screen, prev, row);
        if (!pc)
            break;
        if (pc.width === 2 /* CellWidth.SpacerTail */) {
            // Step over the spacer to the wide-char head
            if (prev === 0 || noSelect[rowOff + prev - 1] === 1)
                break;
            const head = cellAt(screen, prev - 1, row);
            if (!head || charClass(head.char) !== cls)
                break;
            lo = prev - 1;
            continue;
        }
        if (charClass(pc.char) !== cls)
            break;
        lo = prev;
    }
    // Expand right: same logic, skipping spacer tails.
    let hi = c;
    while (hi < width - 1) {
        const next = hi + 1;
        if (noSelect[rowOff + next] === 1)
            break;
        const nc = cellAt(screen, next, row);
        if (!nc)
            break;
        if (nc.width === 2 /* CellWidth.SpacerTail */) {
            // Include the spacer tail in the selection range (it belongs to
            // the wide char at hi) and continue past it.
            hi = next;
            continue;
        }
        if (charClass(nc.char) !== cls)
            break;
        hi = next;
    }
    return { lo, hi };
}
/** -1 if a < b, 1 if a > b, 0 if equal (reading order: row then col). */
function comparePoints(a, b) {
    if (a.row !== b.row)
        return a.row < b.row ? -1 : 1;
    if (a.col !== b.col)
        return a.col < b.col ? -1 : 1;
    return 0;
}
/**
 * Select the word at (col, row) by scanning the screen buffer for the
 * bounds of the same-class character run. Mutates the selection in place.
 * No-op if the click is out of bounds or lands on a noSelect cell.
 * Sets isDragging=true and anchorSpan so a subsequent drag extends the
 * selection word-by-word (native macOS behavior).
 */
export function selectWordAt(s, screen, col, row) {
    const b = wordBoundsAt(screen, col, row);
    if (!b)
        return;
    const lo = { col: b.lo, row };
    const hi = { col: b.hi, row };
    s.anchor = lo;
    s.focus = hi;
    s.isDragging = true;
    s.anchorSpan = { lo, hi, kind: 'word' };
}
// Printable ASCII minus terminal URL delimiters. Restricting to single-
// codeunit ASCII keeps cell-count === string-index, so the column-span
// check below is exact (no wide-char/grapheme drift).
const URL_BOUNDARY = new Set([...'<>"\'` ']);
function isUrlChar(c) {
    if (c.length !== 1)
        return false;
    const code = c.charCodeAt(0);
    return code >= 0x21 && code <= 0x7e && !URL_BOUNDARY.has(c);
}
/**
 * Scan the screen buffer for a plain-text URL at (col, row). Mirrors the
 * terminal's native Cmd+Click URL detection, which fullscreen mode's mouse
 * tracking intercepts. Called from getHyperlinkAt as a fallback when the
 * cell has no OSC 8 hyperlink.
 */
export function findPlainTextUrlAt(screen, col, row) {
    if (row < 0 || row >= screen.height)
        return undefined;
    const width = screen.width;
    const noSelect = screen.noSelect;
    const rowOff = row * width;
    let c = col;
    if (c > 0) {
        const cell = cellAt(screen, c, row);
        if (cell && cell.width === 2 /* CellWidth.SpacerTail */)
            c -= 1;
    }
    if (c < 0 || c >= width || noSelect[rowOff + c] === 1)
        return undefined;
    const startCell = cellAt(screen, c, row);
    if (!startCell || !isUrlChar(startCell.char))
        return undefined;
    // Expand left/right to the bounds of the URL-char run. URLs are ASCII
    // (CellWidth.Narrow, 1 codeunit), so hitting a non-ASCII/wide/spacer
    // cell is a boundary — no need to step over spacers like wordBoundsAt.
    let lo = c;
    while (lo > 0) {
        const prev = lo - 1;
        if (noSelect[rowOff + prev] === 1)
            break;
        const pc = cellAt(screen, prev, row);
        if (!pc || pc.width !== 0 /* CellWidth.Narrow */ || !isUrlChar(pc.char))
            break;
        lo = prev;
    }
    let hi = c;
    while (hi < width - 1) {
        const next = hi + 1;
        if (noSelect[rowOff + next] === 1)
            break;
        const nc = cellAt(screen, next, row);
        if (!nc || nc.width !== 0 /* CellWidth.Narrow */ || !isUrlChar(nc.char))
            break;
        hi = next;
    }
    let token = '';
    for (let i = lo; i <= hi; i++)
        token += cellAt(screen, i, row).char;
    // 1 cell = 1 char across [lo, hi] (ASCII-only run), so string index =
    // column offset. Find the last scheme anchor at or before the click —
    // a run like `https://a.com,https://b.com` has two, and clicking the
    // second should return the second URL, not the greedy match of both.
    const clickIdx = c - lo;
    const schemeRe = /(?:https?|file):\/\//g;
    let urlStart = -1;
    let urlEnd = token.length;
    for (let m; (m = schemeRe.exec(token));) {
        if (m.index > clickIdx) {
            urlEnd = m.index;
            break;
        }
        urlStart = m.index;
    }
    if (urlStart < 0)
        return undefined;
    let url = token.slice(urlStart, urlEnd);
    // Strip trailing sentence punctuation. For closers () ] }, only strip
    // if unbalanced — `/wiki/Foo_(bar)` keeps `)`, `/arr[0]` keeps `]`.
    const OPENER = { ')': '(', ']': '[', '}': '{' };
    while (url.length > 0) {
        const last = url.at(-1);
        if ('.,;:!?'.includes(last)) {
            url = url.slice(0, -1);
            continue;
        }
        const opener = OPENER[last];
        if (!opener)
            break;
        let opens = 0;
        let closes = 0;
        for (let i = 0; i < url.length; i++) {
            const ch = url.charAt(i);
            if (ch === opener)
                opens++;
            else if (ch === last)
                closes++;
        }
        if (closes > opens)
            url = url.slice(0, -1);
        else
            break;
    }
    // urlStart already guarantees click >= URL start; check right edge.
    if (clickIdx >= urlStart + url.length)
        return undefined;
    return url;
}
/**
 * Select the entire row. Sets isDragging=true and anchorSpan so a
 * subsequent drag extends the selection line-by-line. The anchor/focus
 * span from col 0 to width-1; getSelectedText handles noSelect skipping
 * and trailing-whitespace trimming so the copied text is just the visible
 * line content.
 */
export function selectLineAt(s, screen, row) {
    if (row < 0 || row >= screen.height)
        return;
    const lo = { col: 0, row };
    const hi = { col: screen.width - 1, row };
    s.anchor = lo;
    s.focus = hi;
    s.isDragging = true;
    s.anchorSpan = { lo, hi, kind: 'line' };
}
/**
 * Extend a word/line-mode selection to the word/line at (col, row). The
 * anchor span (the original multi-clicked word/line) stays selected; the
 * selection grows from that span to the word/line at the current mouse
 * position. Word mode falls back to the raw cell when the mouse is over a
 * noSelect cell or out of bounds, so dragging into gutters still extends.
 */
export function extendSelection(s, screen, col, row) {
    if (!s.isDragging || !s.anchorSpan)
        return;
    const span = s.anchorSpan;
    let mLo;
    let mHi;
    if (span.kind === 'word') {
        const b = wordBoundsAt(screen, col, row);
        mLo = { col: b ? b.lo : col, row };
        mHi = { col: b ? b.hi : col, row };
    }
    else {
        const r = clamp(row, 0, screen.height - 1);
        mLo = { col: 0, row: r };
        mHi = { col: screen.width - 1, row: r };
    }
    if (comparePoints(mHi, span.lo) < 0) {
        // Mouse target ends before anchor span: extend backward.
        s.anchor = span.hi;
        s.focus = mLo;
    }
    else if (comparePoints(mLo, span.hi) > 0) {
        // Mouse target starts after anchor span: extend forward.
        s.anchor = span.lo;
        s.focus = mHi;
    }
    else {
        // Mouse overlaps the anchor span: just select the anchor span.
        s.anchor = span.lo;
        s.focus = span.hi;
    }
}
/**
 * Set focus to (col, row) for keyboard selection extension (shift+arrow).
 * Anchor stays fixed; selection grows or shrinks depending on where focus
 * moves relative to anchor. Drops to char mode (clears anchorSpan) —
 * native macOS does this too: shift+arrow after a double-click word-select
 * extends char-by-char from the word edge, not word-by-word. Scrolled-off
 * accumulators are preserved: keyboard-extending a drag-scrolled selection
 * keeps the off-screen rows. Caller supplies coords already clamped/wrapped.
 */
export function moveFocus(s, col, row) {
    if (!s.focus)
        return;
    s.anchorSpan = null;
    s.focus = { col, row };
    // Explicit user repositioning — any stale virtual focus (from a prior
    // shiftSelection clamp) no longer reflects intent. Anchor stays put so
    // virtualAnchorRow is still valid for its own round-trip.
    s.virtualFocusRow = undefined;
}
/**
 * Shift anchor AND focus by dRow, clamped to [minRow, maxRow]. Used for
 * keyboard scroll (PgUp/PgDn/ctrl+u/d/b/f): the whole selection must track
 * the content, unlike drag-to-scroll where focus stays at the mouse. Any
 * point that hits a clamp bound gets its col reset to the full-width edge —
 * its original content scrolled off-screen and was captured by
 * captureScrolledRows, so the col constraint was already consumed. Keeping
 * it would truncate the NEW content now at that screen row. Clamp col is 0
 * for dRow<0 (scrolling down, top leaves, 'above' semantics) or width-1 for
 * dRow>0 (scrolling up, bottom leaves, 'below' semantics).
 *
 * If both ends overshoot the SAME viewport edge (select text → Home/End/g/G
 * jumps far enough that both are out of view), clear — otherwise both clamp
 * to the same corner cell and a ghost 1-cell highlight lingers, and
 * getSelectedText returns one unrelated char from that corner. Symmetric
 * with shiftSelectionForFollow's top-edge check, but bidirectional: keyboard
 * scroll can jump either way.
 */
export function shiftSelection(s, dRow, minRow, maxRow, width) {
    if (!s.anchor || !s.focus)
        return;
    // Virtual rows track pre-clamp positions so reverse scrolls restore
    // correctly. Without this, clamp(5→0) + shift(+10) = 10, not the true 5,
    // and scrolledOffAbove stays stale (highlight ≠ copy).
    const vAnchor = (s.virtualAnchorRow ?? s.anchor.row) + dRow;
    const vFocus = (s.virtualFocusRow ?? s.focus.row) + dRow;
    if ((vAnchor < minRow && vFocus < minRow) ||
        (vAnchor > maxRow && vFocus > maxRow)) {
        clearSelection(s);
        return;
    }
    // Debt = how far the nearer endpoint overshoots each edge. When debt
    // shrinks (reverse scroll), those rows are back on-screen — pop from
    // the accumulator so getSelectedText doesn't double-count them.
    const oldMin = Math.min(s.virtualAnchorRow ?? s.anchor.row, s.virtualFocusRow ?? s.focus.row);
    const oldMax = Math.max(s.virtualAnchorRow ?? s.anchor.row, s.virtualFocusRow ?? s.focus.row);
    const oldAboveDebt = Math.max(0, minRow - oldMin);
    const oldBelowDebt = Math.max(0, oldMax - maxRow);
    const newAboveDebt = Math.max(0, minRow - Math.min(vAnchor, vFocus));
    const newBelowDebt = Math.max(0, Math.max(vAnchor, vFocus) - maxRow);
    if (newAboveDebt < oldAboveDebt) {
        // scrolledOffAbove pushes newest at the end (closest to on-screen).
        const drop = oldAboveDebt - newAboveDebt;
        s.scrolledOffAbove.length -= drop;
        s.scrolledOffAboveSW.length = s.scrolledOffAbove.length;
    }
    if (newBelowDebt < oldBelowDebt) {
        // scrolledOffBelow unshifts newest at the front (closest to on-screen).
        const drop = oldBelowDebt - newBelowDebt;
        s.scrolledOffBelow.splice(0, drop);
        s.scrolledOffBelowSW.splice(0, drop);
    }
    // Invariant: accumulator length ≤ debt. If the accumulator exceeds debt,
    // the excess is stale — e.g., moveFocus cleared virtualFocusRow without
    // trimming the accumulator, orphaning entries the pop above can never
    // reach because oldDebt was ALREADY 0. Truncate to debt (keeping the
    // newest = closest-to-on-screen entries). Check newDebt (not oldDebt):
    // captureScrolledRows runs BEFORE this shift in the real flow (ink.tsx),
    // so at entry the accumulator is populated but oldDebt is still 0 —
    // that's the normal establish-debt path, not stale.
    if (s.scrolledOffAbove.length > newAboveDebt) {
        // Above pushes newest at END → keep END.
        s.scrolledOffAbove =
            newAboveDebt > 0 ? s.scrolledOffAbove.slice(-newAboveDebt) : [];
        s.scrolledOffAboveSW =
            newAboveDebt > 0 ? s.scrolledOffAboveSW.slice(-newAboveDebt) : [];
    }
    if (s.scrolledOffBelow.length > newBelowDebt) {
        // Below unshifts newest at FRONT → keep FRONT.
        s.scrolledOffBelow = s.scrolledOffBelow.slice(0, newBelowDebt);
        s.scrolledOffBelowSW = s.scrolledOffBelowSW.slice(0, newBelowDebt);
    }
    // Clamp col depends on which EDGE (not dRow direction): virtual tracking
    // means a top-clamped point can stay top-clamped during a dRow>0 reverse
    // shift — dRow-based clampCol would give it the bottom col.
    const shift = (p, vRow) => {
        if (vRow < minRow)
            return { col: 0, row: minRow };
        if (vRow > maxRow)
            return { col: width - 1, row: maxRow };
        return { col: p.col, row: vRow };
    };
    s.anchor = shift(s.anchor, vAnchor);
    s.focus = shift(s.focus, vFocus);
    s.virtualAnchorRow =
        vAnchor < minRow || vAnchor > maxRow ? vAnchor : undefined;
    s.virtualFocusRow = vFocus < minRow || vFocus > maxRow ? vFocus : undefined;
    // anchorSpan not virtual-tracked: it's for word/line extend-on-drag,
    // irrelevant to the keyboard-scroll round-trip case.
    if (s.anchorSpan) {
        const sp = (p) => {
            const r = p.row + dRow;
            if (r < minRow)
                return { col: 0, row: minRow };
            if (r > maxRow)
                return { col: width - 1, row: maxRow };
            return { col: p.col, row: r };
        };
        s.anchorSpan = {
            lo: sp(s.anchorSpan.lo),
            hi: sp(s.anchorSpan.hi),
            kind: s.anchorSpan.kind,
        };
    }
}
/**
 * Shift the anchor row by dRow, clamped to [minRow, maxRow]. Used during
 * drag-to-scroll: when the ScrollBox scrolls by N rows, the content that
 * was under the anchor is now at a different viewport row, so the anchor
 * must follow it. Focus is left unchanged (it stays at the mouse position).
 */
export function shiftAnchor(s, dRow, minRow, maxRow) {
    if (!s.anchor)
        return;
    // Same virtual-row tracking as shiftSelection/shiftSelectionForFollow: the
    // drag→follow transition hands off to shiftSelectionForFollow, which reads
    // (virtualAnchorRow ?? anchor.row). Without this, drag-phase clamping
    // leaves virtual undefined → follow initializes from the already-clamped
    // row, under-counting total drift → shiftSelection's invariant-restore
    // prematurely clears valid drag-phase accumulator entries.
    const raw = (s.virtualAnchorRow ?? s.anchor.row) + dRow;
    s.anchor = { col: s.anchor.col, row: clamp(raw, minRow, maxRow) };
    s.virtualAnchorRow = raw < minRow || raw > maxRow ? raw : undefined;
    // anchorSpan not virtual-tracked (word/line extend, irrelevant to
    // keyboard-scroll round-trip) — plain clamp from current row.
    if (s.anchorSpan) {
        const shift = (p) => ({
            col: p.col,
            row: clamp(p.row + dRow, minRow, maxRow),
        });
        s.anchorSpan = {
            lo: shift(s.anchorSpan.lo),
            hi: shift(s.anchorSpan.hi),
            kind: s.anchorSpan.kind,
        };
    }
}
/**
 * Shift the whole selection (anchor + focus + anchorSpan) by dRow, clamped
 * to [minRow, maxRow]. Used when sticky/auto-follow scrolls the ScrollBox
 * while a selection is active — native terminal behavior is for the
 * highlight to walk up the screen with the text (not stay at the same
 * screen position).
 *
 * Differs from shiftAnchor: during drag-to-scroll, focus tracks the live
 * mouse position and only anchor follows the text. During streaming-follow,
 * the selection is text-anchored at both ends — both must move. The
 * isDragging check in ink.tsx picks which shift to apply.
 *
 * If both ends would shift strictly BELOW minRow (unclamped), the selected
 * text has scrolled entirely off the top. Clear it — otherwise a single
 * inverted cell lingers at the viewport top as a ghost (native terminals
 * drop the selection when it leaves scrollback). Landing AT minRow is
 * still valid: that cell holds the correct text. Returns true if the
 * selection was cleared so the caller can notify React-land subscribers
 * (useHasSelection) — the caller is inside onRender so it can't use
 * notifySelectionChange (recursion), must fire listeners directly.
 */
export function shiftSelectionForFollow(s, dRow, minRow, maxRow) {
    if (!s.anchor)
        return false;
    // Mirror shiftSelection: compute raw (unclamped) positions from virtual
    // if set, else current. This handles BOTH the update path (virtual already
    // set from a prior keyboard scroll) AND the initialize path (first clamp
    // happens HERE via follow-scroll, no prior keyboard scroll). Without the
    // initialize path, follow-scroll-first leaves virtual undefined even
    // though the clamp below occurred → a later PgUp computes debt from the
    // clamped row instead of the true pre-clamp row and never pops the
    // accumulator — getSelectedText double-counts the off-screen rows.
    const rawAnchor = (s.virtualAnchorRow ?? s.anchor.row) + dRow;
    const rawFocus = s.focus
        ? (s.virtualFocusRow ?? s.focus.row) + dRow
        : undefined;
    if (rawAnchor < minRow && rawFocus !== undefined && rawFocus < minRow) {
        clearSelection(s);
        return true;
    }
    // Clamp from raw, not p.row+dRow — so a virtual position coming back
    // in-bounds lands at the TRUE position, not the stale clamped one.
    s.anchor = { col: s.anchor.col, row: clamp(rawAnchor, minRow, maxRow) };
    if (s.focus && rawFocus !== undefined) {
        s.focus = { col: s.focus.col, row: clamp(rawFocus, minRow, maxRow) };
    }
    s.virtualAnchorRow =
        rawAnchor < minRow || rawAnchor > maxRow ? rawAnchor : undefined;
    s.virtualFocusRow =
        rawFocus !== undefined && (rawFocus < minRow || rawFocus > maxRow)
            ? rawFocus
            : undefined;
    // anchorSpan not virtual-tracked (word/line extend, irrelevant to
    // keyboard-scroll round-trip) — plain clamp from current row.
    if (s.anchorSpan) {
        const shift = (p) => ({
            col: p.col,
            row: clamp(p.row + dRow, minRow, maxRow),
        });
        s.anchorSpan = {
            lo: shift(s.anchorSpan.lo),
            hi: shift(s.anchorSpan.hi),
            kind: s.anchorSpan.kind,
        };
    }
    return false;
}
export function hasSelection(s) {
    return s.anchor !== null && s.focus !== null;
}
/**
 * Normalized selection bounds: start is always before end in reading order.
 * Returns null if no active selection.
 */
export function selectionBounds(s) {
    if (!s.anchor || !s.focus)
        return null;
    return comparePoints(s.anchor, s.focus) <= 0
        ? { start: s.anchor, end: s.focus }
        : { start: s.focus, end: s.anchor };
}
/**
 * Check if a cell at (col, row) is within the current selection range.
 * Used by the renderer to apply inverse style.
 */
export function isCellSelected(s, col, row) {
    const b = selectionBounds(s);
    if (!b)
        return false;
    const { start, end } = b;
    if (row < start.row || row > end.row)
        return false;
    if (row === start.row && col < start.col)
        return false;
    if (row === end.row && col > end.col)
        return false;
    return true;
}
/** Extract text from one screen row. When the next row is a soft-wrap
 *  continuation (screen.softWrap[row+1]>0), clamp to that content-end
 *  column and skip the trailing trim so the word-separator space survives
 *  the join. See Screen.softWrap for why the clamp is necessary. */
function extractRowText(screen, row, colStart, colEnd) {
    const noSelect = screen.noSelect;
    const rowOff = row * screen.width;
    const contentEnd = row + 1 < screen.height ? screen.softWrap[row + 1] : 0;
    const lastCol = contentEnd > 0 ? Math.min(colEnd, contentEnd - 1) : colEnd;
    let line = '';
    for (let col = colStart; col <= lastCol; col++) {
        // Skip cells marked noSelect (gutters, line numbers, diff sigils).
        // Check before cellAt to avoid the decode cost for excluded cells.
        if (noSelect[rowOff + col] === 1)
            continue;
        const cell = cellAt(screen, col, row);
        if (!cell)
            continue;
        // Skip spacer tails (second half of wide chars) — the head already
        // contains the full grapheme. SpacerHead is a blank at line-end.
        if (cell.width === 2 /* CellWidth.SpacerTail */ ||
            cell.width === 3 /* CellWidth.SpacerHead */) {
            continue;
        }
        line += cell.char;
    }
    return contentEnd > 0 ? line : line.replace(/\s+$/, '');
}
/** Accumulator for selected text that merges soft-wrapped rows back
 *  into logical lines. push(text, sw) appends a newline before text
 *  only when sw=false (i.e. the row starts a new logical line). Rows
 *  with sw=true are concatenated onto the previous row. */
function joinRows(lines, text, sw) {
    if (sw && lines.length > 0) {
        lines[lines.length - 1] += text;
    }
    else {
        lines.push(text);
    }
}
/**
 * Extract text from the screen buffer within the selection range.
 * Rows are joined with newlines unless the screen's softWrap bitmap
 * marks a row as a word-wrap continuation — those rows are concatenated
 * onto the previous row so the copied text matches the logical source
 * line, not the visual wrapped layout. Trailing whitespace on the last
 * fragment of each logical line is trimmed. Wide-char spacer cells are
 * skipped. Rows that scrolled out of the viewport during drag-to-scroll
 * are joined back in from the scrolledOffAbove/Below accumulators along
 * with their captured softWrap bits.
 */
export function getSelectedText(s, screen) {
    const b = selectionBounds(s);
    if (!b)
        return '';
    const { start, end } = b;
    const sw = screen.softWrap;
    const lines = [];
    for (let i = 0; i < s.scrolledOffAbove.length; i++) {
        joinRows(lines, s.scrolledOffAbove[i], s.scrolledOffAboveSW[i]);
    }
    for (let row = start.row; row <= end.row; row++) {
        const rowStart = row === start.row ? start.col : 0;
        const rowEnd = row === end.row ? end.col : screen.width - 1;
        joinRows(lines, extractRowText(screen, row, rowStart, rowEnd), sw[row] > 0);
    }
    for (let i = 0; i < s.scrolledOffBelow.length; i++) {
        joinRows(lines, s.scrolledOffBelow[i], s.scrolledOffBelowSW[i]);
    }
    return lines.join('\n');
}
/**
 * Capture text from rows about to scroll out of the viewport during
 * drag-to-scroll, BEFORE scrollBy overwrites them. Only the rows that
 * intersect the selection are captured, using the selection's col bounds
 * for the anchor-side boundary row. After capturing the anchor row, the
 * anchor.col AND anchorSpan cols are reset to the full-width boundary so
 * subsequent captures and the final getSelectedText don't re-apply a stale
 * col constraint to content that's no longer under the original anchor.
 * Both span cols are reset (not just the near side): after a blocked
 * reversal the drag can flip direction, and extendSelection then reads the
 * OPPOSITE span side — which would otherwise still hold the original word
 * boundary and truncate one subsequently-captured row.
 *
 * side='above': rows scrolling out the top (dragging down, anchor=start).
 * side='below': rows scrolling out the bottom (dragging up, anchor=end).
 */
export function captureScrolledRows(s, screen, firstRow, lastRow, side) {
    const b = selectionBounds(s);
    if (!b || firstRow > lastRow)
        return;
    const { start, end } = b;
    // Intersect [firstRow, lastRow] with [start.row, end.row]. Rows outside
    // the selection aren't captured — they weren't selected.
    const lo = Math.max(firstRow, start.row);
    const hi = Math.min(lastRow, end.row);
    if (lo > hi)
        return;
    const width = screen.width;
    const sw = screen.softWrap;
    const captured = [];
    const capturedSW = [];
    for (let row = lo; row <= hi; row++) {
        const colStart = row === start.row ? start.col : 0;
        const colEnd = row === end.row ? end.col : width - 1;
        captured.push(extractRowText(screen, row, colStart, colEnd));
        capturedSW.push(sw[row] > 0);
    }
    if (side === 'above') {
        // Newest rows go at the bottom of the above-accumulator (closest to
        // the on-screen content in reading order).
        s.scrolledOffAbove.push(...captured);
        s.scrolledOffAboveSW.push(...capturedSW);
        // We just captured the top of the selection. The anchor (=start when
        // dragging down) is now pointing at content that will scroll out; its
        // col constraint was applied to the captured row. Reset to col 0 so
        // the NEXT tick and the final getSelectedText read the full row.
        if (s.anchor && s.anchor.row === start.row && lo === start.row) {
            s.anchor = { col: 0, row: s.anchor.row };
            if (s.anchorSpan) {
                s.anchorSpan = {
                    kind: s.anchorSpan.kind,
                    lo: { col: 0, row: s.anchorSpan.lo.row },
                    hi: { col: width - 1, row: s.anchorSpan.hi.row },
                };
            }
        }
    }
    else {
        // Newest rows go at the TOP of the below-accumulator — they're
        // closest to the on-screen content.
        s.scrolledOffBelow.unshift(...captured);
        s.scrolledOffBelowSW.unshift(...capturedSW);
        if (s.anchor && s.anchor.row === end.row && hi === end.row) {
            s.anchor = { col: width - 1, row: s.anchor.row };
            if (s.anchorSpan) {
                s.anchorSpan = {
                    kind: s.anchorSpan.kind,
                    lo: { col: 0, row: s.anchorSpan.lo.row },
                    hi: { col: width - 1, row: s.anchorSpan.hi.row },
                };
            }
        }
    }
}
/**
 * Apply the selection overlay directly to the screen buffer by changing
 * the style of every cell in the selection range. Called after the
 * renderer produces the Frame but before the diff — the normal diffEach
 * then picks up the restyled cells as ordinary changes, so LogUpdate
 * stays a pure diff engine with no selection awareness.
 *
 * Uses a SOLID selection background (theme-provided via StylePool.
 * setSelectionBg) that REPLACES each cell's bg while PRESERVING its fg —
 * matches native terminal selection. Previously SGR-7 inverse (swapped
 * fg/bg per cell), which fragmented badly over syntax-highlighted text:
 * every distinct fg color became a different bg stripe.
 *
 * Uses StylePool caches so on drag the only work per cell is a Map
 * lookup + packed-int write.
 */
export function applySelectionOverlay(screen, selection, stylePool) {
    const b = selectionBounds(selection);
    if (!b)
        return;
    const { start, end } = b;
    const width = screen.width;
    const noSelect = screen.noSelect;
    for (let row = start.row; row <= end.row && row < screen.height; row++) {
        const colStart = row === start.row ? start.col : 0;
        const colEnd = row === end.row ? Math.min(end.col, width - 1) : width - 1;
        const rowOff = row * width;
        for (let col = colStart; col <= colEnd; col++) {
            const idx = rowOff + col;
            // Skip noSelect cells — gutters stay visually unchanged so it's
            // clear they're not part of the copy. Surrounding selectable cells
            // still highlight so the selection extent remains visible.
            if (noSelect[idx] === 1)
                continue;
            const cell = cellAtIndex(screen, idx);
            setCellStyleId(screen, col, row, stylePool.withSelectionBg(cell.styleId));
        }
    }
}
//# sourceMappingURL=selection.js.map