import { useEffect, useRef } from 'react';
import hotkeys from 'hotkeys-js';
import { useKeymap, type Binding } from './keymap-service';

// FR-K1/K3/K7：从 keymap store 读绑定，多作用域裁决，Ctrl+F 拦截宿主查找
export function useGlobalHotkeys(opts: { onNewDoc: () => void; onSave: () => void; onFocusSearch: () => void; onToggleOutline: () => void; onCheat: () => void; onSettings: () => void; onFind: () => void }) {
  const optsRef = useRef(opts);
  optsRef.current = opts;
  const bindings = useKeymap(s => s.bindings);
  const sig = bindings.map(b => b.id + '@' + b.combo).join('|');
  useEffect(() => {
    const actions: Record<string, () => void> = {
      newDoc: () => optsRef.current.onNewDoc(),
      save: () => optsRef.current.onSave(),
      focusSearch: () => optsRef.current.onFocusSearch(),
      toggleOutline: () => optsRef.current.onToggleOutline(),
      toggleCheat: () => optsRef.current.onCheat(),
      toggleSettings: () => optsRef.current.onSettings(),
      find: () => optsRef.current.onFind(),
    };

    // 将 combo 字符串解析为可比较的修饰键+键名
    const parseCombo = (combo: string) => {
      const parts = combo.toLowerCase().split('+');
      const key = parts[parts.length - 1];
      return {
        key,
        ctrl: parts.includes('ctrl'),
        shift: parts.includes('shift'),
        alt: parts.includes('alt'),
        meta: parts.includes('meta'),
      };
    };
    const matchCombo = (e: KeyboardEvent, combo: string) => {
      const c = parseCombo(combo);
      return e.key.toLowerCase() === c.key &&
        e.ctrlKey === c.ctrl &&
        e.shiftKey === c.shift &&
        e.altKey === c.alt &&
        e.metaKey === c.meta;
    };

    // 编辑器作用域绑定——用捕获阶段 keydown，先于 ProseMirror 拦截
    const editorBindings = bindings.filter(b => b.scope === 'editor' && actions[b.id]);
    const onCaptureKeydown = (e: KeyboardEvent) => {
      for (const b of editorBindings) {
        if (matchCombo(e, b.combo)) {
          e.preventDefault();
          e.stopPropagation();
          actions[b.id]();
          return;
        }
      }
    };
    window.addEventListener('keydown', onCaptureKeydown, true);

    // 全局/应用级绑定——用 hotkeys-js
    const bound: string[] = [];
    for (const b of bindings) {
      if (b.scope === 'editor') continue; // 编辑器键已在捕获阶段处理
      const act = actions[b.id];
      if (act) {
        hotkeys(b.combo, (e) => { e.preventDefault(); act(); });
        bound.push(b.combo);
      }
    }
    hotkeys('?', (e) => { if (document.activeElement?.tagName !== 'INPUT' && document.activeElement?.tagName !== 'TEXTAREA') { e.preventDefault(); optsRef.current.onCheat(); } });
    bound.push('?');

    return () => {
      window.removeEventListener('keydown', onCaptureKeydown, true);
      for (const c of bound) hotkeys.unbind(c);
    };
  }, [sig]);
}