MarkLite/src/renderer/hooks/useKeyboard.ts

import { useEffect, useCallback } from 'react'
import { useTabStore } from '../stores/tabStore'

/**
 * 全局键盘快捷键 hook。
 * MetonaEditor 内置工具栏处理格式化和模式切换（Ctrl+B/I/1/2/3），
 * 本 hook 仅处理应用级快捷键。
 */
export function useKeyboard(handleOpenFile: () => void, handleSave: () => void, handleSaveAs: () => void) {
  const handleKeydown = useCallback((e: KeyboardEvent) => {
    const isCtrl = e.ctrlKey || e.metaKey

    if (isCtrl && e.key === 'o') { e.preventDefault(); handleOpenFile(); return }
    if (isCtrl && e.key === 's' && !e.shiftKey) { e.preventDefault(); handleSave(); return }
    if (isCtrl && e.shiftKey && e.key === 'S') { e.preventDefault(); handleSaveAs(); return }

    const tabState = useTabStore.getState()
    if (isCtrl && e.key === 't') { e.preventDefault(); tabState.createTab(null, ''); return }
    if (isCtrl && e.key === 'w') {
      e.preventDefault()
      if (tabState.activeTabId) tabState.closeTab(tabState.activeTabId)
      return
    }

    // Ctrl+Tab / Ctrl+Shift+Tab — MRU 顺序切换
    if (isCtrl && e.key === 'Tab') {
      e.preventDefault()
      const { tabs, activeTabId, mruStack } = tabState
      if (tabs.length > 1) {
        if (mruStack.length > 0) {
          const targetId = mruStack[0]
          if (tabs.find(t => t.id === targetId)) {
            tabState.switchToTab(targetId)
            return
          }
        }
        const idx = tabs.findIndex(t => t.id === activeTabId)
        const next = e.shiftKey
          ? (idx - 1 + tabs.length) % tabs.length
          : (idx + 1) % tabs.length
        tabState.switchToTab(tabs[next].id)
      }
      return
    }
  }, [handleOpenFile, handleSave, handleSaveAs])

  useEffect(() => {
    document.addEventListener('keydown', handleKeydown)
    return () => document.removeEventListener('keydown', handleKeydown)
  }, [handleKeydown])
}