import { RemoveAnimationKeysCommand, RemoveAnimationTracksCommand } from '../core/commands/animationCommands';
import { RemoveFrameCommand } from '../core/commands/frameCommands';
import { ui } from '../ui';
import { confirmDeleteAsset, createContainer, removeGraphSelection, removeObjects } from './actions';
import type { EditorState } from './state';

export interface ShortcutActions {
  play(): void;
  stop(): void;
  togglePause(): void;
  /** Copy and paste of timeline keys (#102); false when nothing to do there, so the key falls through. */
  copyKeys(): boolean;
  pasteKeys(): boolean;
}

/**
 * Global keyboard shortcuts (see the wiki page "Keyboard"). Text fields keep their own key handling;
 * these only run when no focused widget consumed the key. Returns the call that takes them away
 * again – signing out tears the editor down while the page stays up (#177).
 */
export function installShortcuts(state: EditorState, actions: ShortcutActions): () => void {
  return ui().focus.onGlobalKey((event) => {
    const mod = event.ctrlKey || event.metaKey;
    const key = event.key.toLowerCase();
    if (event.key === 'Escape' && state.mode === 'play') {
      actions.stop();
      return true;
    }
    if (mod && key === 'z') {
      if (event.shiftKey) state.redo();
      else state.undo();
      return true;
    }
    if (mod && key === 'y') {
      state.redo();
      return true;
    }
    if (mod && key === 'c') return actions.copyKeys();
    if (mod && key === 'v') return actions.pasteKeys();
    if (mod && key === 'g') {
      const s = state.selection;
      if (s?.kind === 'object') createContainer(state, s.holderId, s.objectIds);
      return true;
    }
    if (event.key === 'Delete' || event.key === 'Backspace') {
      const s = state.selection;
      if (s?.kind === 'object') removeObjects(state, s.holderId, s.objectIds);
      else if (s?.kind === 'node') removeGraphSelection(state, s.assetId, s.nodeIds, s.annotationIds);
      else if (s?.kind === 'frame') state.execute(new RemoveFrameCommand(s.assetId, s.frameId));
      else if (s?.kind === 'annotation') removeGraphSelection(state, s.assetId, [], s.annotationIds);
      // The keys when some are picked, else the row itself – like a frame of a texture.
      else if (s?.kind === 'track')
        state.execute(
          s.keys.length > 0
            ? new RemoveAnimationKeysCommand(s.assetId, s.keys)
            : new RemoveAnimationTracksCommand(s.assetId, [s.trackId]),
        );
      else if (s?.kind === 'asset') confirmDeleteAsset(state, s.assetId);
      return s !== null;
    }
    // Ctrl+Enter starts play and then holds/resumes it. A plain letter would be taken away from
    // the game, which owns the keyboard while playing.
    if (mod && event.key === 'Enter') {
      if (state.mode === 'edit') actions.play();
      else actions.togglePause();
      return true;
    }
    return false;
  });
}