/**
 * Editor keyboard shortcuts — bound to `document` so shortcuts work
 * without first clicking into the canvas. Gated by `state.editorOpen`
 * so they don't leak into chat input when the editor is closed.
 *
 * Covers:
 *   ?              toggle the shortcuts cheatsheet
 *   Enter          confirm in-progress transform
 *   Esc            cancel transform / lasso / crop (in priority order)
 *   Ctrl+Z         undo (Shift adds redo)
 *   Ctrl+D         deselect (clears wand + lasso)
 *   Ctrl+S         save (Shift = save as / export to gallery)
 *   Ctrl+Shift+T   open resize popup
 *   Ctrl+Alt+T     start free transform
 *   Ctrl+Alt+Shift+I invert selection (Ctrl+Alt+I also works)
 *   Ctrl+Alt+J     new empty layer
 *   Ctrl/Cmd+J     copy selected pixels to a layer, or duplicate the layer
 *   Ctrl+Alt+G     create/release clipping mask
 *   Ctrl+A         select all canvas
 *   Ctrl+C/X       copy / cut the selected surface (image clipboard
 *                  + internal clipboard, preserving its document offset)
 *   Ctrl+V         (handled by the paste event listener)
 *   Tool keys (V, B, E, L, …) → toolbar click
 *   Hold Space     temporarily pan without changing the active tool
 *   [ / ]          shrink / grow brush size proportionally
 *   Delete / Backspace (wand or lasso) → delete pixels
 *
 * @param {{
 *   toolbar:                HTMLDivElement,
 *   toolKeyMap:             Record<string, string>,
 *   composite:              () => void,
 *   saveState:              (label?: string) => void,
 *   undo:                   () => void,
 *   redo:                   () => void,
 *   toggleShortcuts:        (show?: boolean) => void,
 *   confirmTransform:       () => void,
 *   cancelTransform:        () => void,
 *   nudgeTransform:         (dx: number, dy: number) => boolean,
 *   startTransform:         () => void,
 *   resizeCustomPrompt:     () => void,
 *   addEmptyLayer:          () => void,
 *   brushSizeSync:          (source: HTMLInputElement | null) => void,
 *   invertSelection:        () => boolean,
 *   wandDeleteSelection:    () => void,
 *   wandCopyToNewLayer:     () => void,
 *   lassoDeleteSelection:   () => void,
 *   lassoCopyToLayer:       () => void,
 *   copyPixelsToClipboard:  (options: {cut: boolean}) => Promise<void>,
 *   activeLayer:            () => object | null,
 *   deleteSelectedLayers:   () => boolean | Promise<boolean>,
 *   duplicateActiveLayer:   () => boolean,
 *   uiModule:               object,
 * }} deps
 */
import { state } from './state.js';
import { isAltGrEvent } from '../platform.js';
import { createMarqueeMask } from './selection-mask.js';

let keyboardBindings;

export function wireKeyboardShortcuts(deps) {
  keyboardBindings?.abort();
  keyboardBindings = new AbortController();
  const { signal } = keyboardBindings;
  const {
    toolbar, toolKeyMap,
    composite, saveState, undo, redo,
    toggleShortcuts, confirmTransform, cancelTransform, startTransform, nudgeTransform,
    resizeCustomPrompt, addEmptyLayer, brushSizeSync,
    invertSelection,
    wandDeleteSelection, wandCopyToNewLayer, copyPixelsToClipboard,
    lassoDeleteSelection, lassoCopyToLayer,
    activeLayer, deleteSelectedLayers, duplicateActiveLayer, uiModule,
    setTemporaryPan,
    nudgeActiveLayer, endLayerNudge,
    toggleQuickMask, nudgeSelection,
    deselectSelection, fillSelection,
  } = deps;

  const isTypingTarget = (target) => target && (
    target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' ||
    target.tagName === 'SELECT' || target.isContentEditable
  );

  const releaseTemporaryPan = () => setTemporaryPan?.(false);
  document.addEventListener('keyup', (e) => {
    if (e.code === 'Space') releaseTemporaryPan();
    if (e.key.startsWith('Arrow')) endLayerNudge?.();
  }, { signal });
  window.addEventListener('blur', releaseTemporaryPan, { signal });

  document.addEventListener('keydown', (e) => {
    if (!state.editorOpen || e.defaultPrevented || e.isComposing) return;
    if (e.target?.closest?.('#styled-confirm-overlay')) return;
    // Fields and text layers own native editing, including undo and clipboard.
    if (isTypingTarget(e.target)) return;
    if (e.altKey && !e.ctrlKey && !e.metaKey && !e.shiftKey && e.key === 'Backspace') {
      e.preventDefault();
      e.stopPropagation();
      if (!e.repeat) fillSelection?.();
      return;
    }
    if (e.code === 'Space' && !isTypingTarget(e.target)) {
      e.preventDefault();
      setTemporaryPan?.(true);
      return;
    }
    if (!isTypingTarget(e.target) && state.tool === 'marquee' && e.key.startsWith('Arrow')) {
      const amount = e.shiftKey ? 10 : 1;
      const delta = {
        ArrowLeft: [-amount, 0], ArrowRight: [amount, 0],
        ArrowUp: [0, -amount], ArrowDown: [0, amount],
      }[e.key];
      if (delta && nudgeSelection?.(...delta)) {
        e.preventDefault();
        return;
      }
    }
    if (!isTypingTarget(e.target) && state.transformActive && e.key.startsWith('Arrow')) {
      const amount = e.shiftKey ? 10 : 1;
      const delta = {
        ArrowLeft: [-amount, 0], ArrowRight: [amount, 0],
        ArrowUp: [0, -amount], ArrowDown: [0, amount],
      }[e.key];
      if (delta && nudgeTransform?.(...delta)) {
        e.preventDefault();
        return;
      }
    }
    if (!isTypingTarget(e.target) && ['move', 'transform'].includes(state.tool) && e.key.startsWith('Arrow')) {
      const amount = e.shiftKey ? 10 : 1;
      const delta = {
        ArrowLeft: [-amount, 0], ArrowRight: [amount, 0],
        ArrowUp: [0, -amount], ArrowDown: [0, amount],
      }[e.key];
      if (delta && nudgeActiveLayer?.(...delta)) {
        e.preventDefault();
        return;
      }
    }
    // `?` toggles the cheatsheet. Don't fire while typing in a text
    // field — the user might be typing a prompt with a `?`.
    if (e.key === '?' && e.target.tagName !== 'INPUT' && e.target.tagName !== 'TEXTAREA') {
      e.preventDefault();
      toggleShortcuts();
      return;
    }
    if (e.key === 'Enter' && state.transformActive) {
      e.preventDefault();
      confirmTransform();
      return;
    }
    if (e.key === 'Escape') return;
    // Skip the Ctrl+Alt editor chords for an AltGr keystroke (see platform.js);
    // only the chord block is skipped, so the layout-character handlers below
    // still act — AltGr+5 / AltGr+8 stay as the [ ] brush-size shortcut on
    // AZERTY / QWERTZ.
    if ((e.ctrlKey || e.metaKey) && !isAltGrEvent(e)) {
      if (e.key.toLowerCase() === 'z') {
        e.preventDefault(); e.stopPropagation();
        if (e.shiftKey) redo(); else undo();
        return;
      }
      // Preserve the old chord as an alias while supporting the familiar one.
      if (!e.altKey && e.key.toLowerCase() === 'd') {
        e.preventDefault(); e.stopPropagation();
        deselectSelection?.();
        return;
      }
      // Save shortcuts — match the hints shown in the Save dropdown.
      if ((e.key === 's' || e.key === 'S') && !e.altKey) {
        e.preventDefault();
        document.getElementById(e.shiftKey ? 'ge-export-gallery' : 'ge-save')?.click();
        e.stopPropagation();
        return;
      }
      if (e.shiftKey && e.key === 'T') { e.preventDefault(); e.stopPropagation(); resizeCustomPrompt(); return; }
      if (e.altKey && e.code === 'KeyT') { e.preventDefault(); e.stopPropagation(); startTransform(); return; }
      // Ctrl+Alt+Shift+I (or the previous Ctrl+Alt+I) inverts the selection. Uses e.code so
      // Alt-modified key values (e.g. `ˆ` on Mac with Option+I)
      // don't break the match.
      if (e.altKey && e.code === 'KeyI') {
        if (invertSelection()) {
          e.preventDefault();
          e.stopPropagation();
        }
        return;
      }
      // Ctrl+Alt+J — new empty layer.
      if (e.altKey && e.code === 'KeyJ') {
        e.preventDefault();
        e.stopPropagation();
        addEmptyLayer();
        return;
      }
      // Ctrl/Cmd+J duplicates the active layer through the layer panel's
      // existing implementation, which preserves masks and effects.
      if (!e.altKey && e.code === 'KeyJ') {
        e.preventDefault();
        e.stopPropagation();
        if (state.wandMask) wandCopyToNewLayer();
        else if (state.lassoPoints.length >= 3) lassoCopyToLayer();
        else duplicateActiveLayer?.();
        return;
      }
      // Ctrl+Alt+G — Photoshop-compatible clipping mask shortcut.
      if (e.altKey && e.code === 'KeyG') {
        const row = [...document.querySelectorAll('.ge-layer-item[data-layer-id]')]
          .find(item => item.dataset.layerId === state.activeLayerId);
        const button = row?.querySelector('.ge-layer-clip-btn');
        if (button && !button.disabled) {
          e.preventDefault();
          e.stopPropagation();
          button.click();
        }
        return;
      }
      if (!e.altKey && (e.key.toLowerCase() === 'c' || e.key.toLowerCase() === 'x')) {
        e.preventDefault();
        e.stopPropagation();
        void copyPixelsToClipboard({ cut: e.key.toLowerCase() === 'x' });
        return;
      }
      // Keep Ctrl+Alt+A as an alias for existing users.
      if (e.key.toLowerCase() === 'a' && state.imgWidth > 0 && state.imgHeight > 0) {
        e.preventDefault();
        e.stopPropagation();
        saveState('Select all');
        state.wandMask = createMarqueeMask(
          state.imgWidth,
          state.imgHeight,
          { x: 0, y: 0, w: state.imgWidth, h: state.imgHeight },
          'rectangle',
        );
        state.wandLayerId = state.activeLayerId;
        state.wandMaskSpace = 'document';
        state.selectionSource = 'marquee';
        state.wandLastSeed = null;
        state.lassoPoints = [];
        composite();
        uiModule.showToast('All selected — Ctrl+C to copy, Del to delete');
      }
      // Ctrl+V handled by the paste event listener.
      if (e.key === 'v') { /* no-op here */ }
      return;
    }
    // Tool shortcuts (only when not typing in an input).
    if (isTypingTarget(e.target)) return;

    // Delete pixels for a selection, otherwise delete the selected layer(s).
    // Clipboard shortcuts above retain ownership of Ctrl/Cmd+X and C.
    if (e.key === 'Delete' || e.key === 'Backspace') {
      if (state.wandMask) {
        e.preventDefault();
        wandDeleteSelection();
        return;
      }
      if (state.lassoPoints.length >= 3) {
        e.preventDefault();
        lassoDeleteSelection();
        return;
      }
      const layer = activeLayer?.();
      const activeMask = layer?.activeMaskId &&
        layer.masks?.some(mask => mask.id === layer.activeMaskId);
      const group = state.activeGroupId &&
        state.layerGroups?.find(item => item.id === state.activeGroupId);
      const activeGroupMask = group?.activeMaskId &&
        group.masks?.some(mask => mask.id === group.activeMaskId);
      if (state.transformActive || state.cropping || state.cropMoving ||
          state.marqueeActive || state.selectionMoving || state.lassoActive ||
          activeMask || activeGroupMask || state.maskInspectMode) return;
      if (deleteSelectedLayers) {
        e.preventDefault();
        deleteSelectedLayers();
        return;
      }
    }

    if (!e.ctrlKey && !e.metaKey && !e.altKey && e.key.toLowerCase() === 'q') {
      e.preventDefault();
      toggleQuickMask?.();
      return;
    }
    const toolId = toolKeyMap[e.key.toLowerCase()];
    if (toolId) {
      e.preventDefault();
      e.stopPropagation();
      const toolBtn = toolbar.querySelector(`[data-tool="${toolId}"]`);
      if (toolBtn) toolBtn.click();
      return;
    }
    // Bracket keys for brush size — ±10% multiplier mirrors the
    // exponential slider curve so each press feels the same at any
    // size.
    if (e.key === '[' || e.key === ']') {
      const factor = e.key === '[' ? 0.9 : 1.1;
      state.brushSize = Math.max(1, Math.min(800, Math.round(state.brushSize * factor)));
      try { brushSizeSync(null); } catch {}
    }
  }, { signal });
}