/**
 * useKeyboardShortcuts - 全局快捷键管理 Hook (v1.4.0 自定义快捷键)
 *
 * 在 App.tsx 挂载，处理全局键盘快捷键。
 * 从 keybindingStore 读取用户自定义的键绑定，实现可配置的快捷键。
 *
 * 默认快捷键:
 * - Ctrl+Tab / Ctrl+Shift+Tab: 切换标签
 * - Ctrl+1~9: 跳转到指定索引标签
 * - Ctrl+W: 关闭当前标签
 * - F11: 全屏切换
 * - Ctrl+Shift+N: 新建标签
 * - Ctrl+Shift+P: 打开命令面板
 * - Ctrl+N: 新建会话
 * - Ctrl+K: 快速连接
 */

import { useEffect } from 'react'
import { useTabStore } from '../stores/tabStore'
import { useCommandPaletteStore } from '../stores/commandPaletteStore'
import { useKeybindingStore } from '../stores/keybindingStore'
import { KeybindingAction } from '../constants/keybindings'
import { createLogger } from '../utils/logger'

const logger = createLogger('KeyboardShortcuts')

/** 检查事件目标是否为输入元素 */
function isInputElement(e: KeyboardEvent): boolean {
  const target = e.target as HTMLElement
  if (!target) return false
  const tagName = target.tagName.toLowerCase()
  return tagName === 'input' || tagName === 'textarea' || tagName === 'select' || target.isContentEditable
}

/** Native text editing commands are reserved inside editable controls. */
function isNativeEditingShortcut(e: KeyboardEvent): boolean {
  if (!(e.ctrlKey || e.metaKey) || e.altKey) return false
  const key = e.key.toLowerCase()
  return ['a', 'c', 'v', 'x', 'z', 'y'].includes(key)
}

/**
 * 将键序列字符串 (如 "Ctrl+Shift+P") 匹配到 KeyboardEvent
 * 支持跨平台: Ctrl 和 Meta (Cmd) 均可触发
 */
function matchesKeySequence(e: KeyboardEvent, keySequence: string): boolean {
  if (!keySequence) return false

  const parts = keySequence
    .split('+')
    .map((p) => p.trim())
    .filter(Boolean)
  const modifiers: string[] = []
  let mainKey = ''

  for (const part of parts) {
    const lower = part.toLowerCase()
    if (lower === 'ctrl' || lower === 'control' || lower === 'meta' || lower === 'cmd') {
      modifiers.push('ctrl')
    } else if (lower === 'shift') {
      modifiers.push('shift')
    } else if (lower === 'alt' || lower === 'option') {
      modifiers.push('alt')
    } else {
      mainKey = part
    }
  }

  const needsCtrl = modifiers.includes('ctrl')
  const needsShift = modifiers.includes('shift')
  const needsAlt = modifiers.includes('alt')

  // 跨平台: Ctrl (Win/Linux) 或 Meta (macOS Cmd)
  const ctrlOrMeta = e.ctrlKey || e.metaKey
  const eventHasCtrl = ctrlOrMeta
  const eventHasShift = e.shiftKey
  const eventHasAlt = e.altKey

  if (needsCtrl !== eventHasCtrl) return false
  if (needsShift !== eventHasShift) return false
  if (needsAlt !== eventHasAlt) return false

  // 匹配主键
  if (!mainKey) return false

  // 特殊键映射
  const keyLower = mainKey.toLowerCase()
  const eventKey = e.key

  switch (keyLower) {
    case 'tab':
      return eventKey === 'Tab'
    case 'enter':
      return eventKey === 'Enter'
    case 'escape':
      return eventKey === 'Escape'
    case 'space':
      return eventKey === ' '
    case 'backspace':
      return eventKey === 'Backspace'
    case 'delete':
      return eventKey === 'Delete'
    default:
      // F-keys
      if (keyLower.startsWith('f') && keyLower.length <= 3) {
        return eventKey === mainKey
      }
      // 普通字母/数字
      return eventKey.toLowerCase() === keyLower
  }
}

/**
 * 判断快捷键是否应该在输入框中触发
 * 通过 keybindingStore 的 fireInInput 属性决定
 */
function shouldFireInInput(e: KeyboardEvent): boolean {
  const store = useKeybindingStore.getState()
  const allBindings = store.getAllEffective()

  // 使用动态 import 避免的 KEYBINDING_DEFINITIONS
  // 直接检查已知的 fireInInput 操作
  const fireAlways = [
    KeybindingAction.TAB_NEXT,
    KeybindingAction.TAB_PREV,
    KeybindingAction.TAB_GOTO_N,
    KeybindingAction.VIEW_FULLSCREEN,
    KeybindingAction.TOOLS_COMMAND_PALETTE,
  ]

  for (const actionId of fireAlways) {
    if (matchesKeySequence(e, allBindings[actionId])) {
      return true
    }
  }
  return false
}

export function useKeyboardShortcuts(): void {
  useEffect(() => {
    // 加载自定义快捷键
    useKeybindingStore.getState().loadFromSettings()

    const handleKeyDown = (e: KeyboardEvent) => {
      const ctrlOrMeta = e.ctrlKey || e.metaKey
      const store = useKeybindingStore.getState()
      const keys = store.getAllEffective()

      // Never let configurable application shortcuts shadow the platform's
      // select/copy/cut/paste/undo/redo behavior in text controls.
      if (isInputElement(e) && isNativeEditingShortcut(e)) return

      // ---- 命令面板 ----
      if (matchesKeySequence(e, keys[KeybindingAction.TOOLS_COMMAND_PALETTE])) {
        e.preventDefault()
        useCommandPaletteStore.getState().toggle()
        return
      }

      // ---- Ctrl+Tab: 下一个标签 ----
      if (matchesKeySequence(e, keys[KeybindingAction.TAB_NEXT])) {
        e.preventDefault()
        useTabStore.getState().switchToNextTab()
        return
      }

      // ---- Ctrl+Shift+Tab: 上一个标签 ----
      if (matchesKeySequence(e, keys[KeybindingAction.TAB_PREV])) {
        e.preventDefault()
        useTabStore.getState().switchToPrevTab()
        return
      }

      // ---- Ctrl+1~9: 跳转指定标签 ----
      if (ctrlOrMeta && !e.shiftKey && !e.altKey) {
        const num = parseInt(e.key, 10)
        if (num >= 1 && num <= 9) {
          // 特殊处理: Ctrl+1~9 是范围键，不匹配单个键序列
          const gotoKeys = keys[KeybindingAction.TAB_GOTO_N]
          if (gotoKeys.includes('…') || gotoKeys.includes('...')) {
            e.preventDefault()
            useTabStore.getState().activateTabByIndex(num - 1)
            return
          }
        }
      }

      // ---- F11: 全屏 ----
      if (matchesKeySequence(e, keys[KeybindingAction.VIEW_FULLSCREEN])) {
        e.preventDefault()
        if (window.opsxApi?.settingsSet) {
          window.opsxApi
            .settingsGet('fullscreen')
            .then((res: { success: boolean; value?: unknown }) => {
              const isFullscreen = res?.value === true
              window.opsxApi?.settingsSet('fullscreen', !isFullscreen)
            })
            .catch(() => {
              logger.warn('Failed to toggle fullscreen')
            })
        }
        return
      }

      // ---- 以下快捷键在输入框中不触发 (除非 fireInInput=true) ----
      if (isInputElement(e) && !shouldFireInInput(e)) {
        return
      }

      // ---- Ctrl+W: 关闭标签 ----
      if (matchesKeySequence(e, keys[KeybindingAction.TAB_CLOSE])) {
        e.preventDefault()
        const { tabs, activeTabId, closeTab } = useTabStore.getState()
        if (activeTabId && tabs.length > 1) {
          logger.debug('Ctrl+W: closing tab', activeTabId)
          closeTab(activeTabId)
        }
        return
      }

      // ---- Ctrl+Shift+N: 新建标签 ----
      if (matchesKeySequence(e, keys[KeybindingAction.TAB_NEW])) {
        e.preventDefault()
        useTabStore.getState().addTab({ title: '新标签', type: 'welcome' })
        return
      }

      // ---- Ctrl+N: 新建会话 (在 App.tsx 通过 onMenuNewSession 处理) ----
      if (matchesKeySequence(e, keys[KeybindingAction.SESSION_NEW])) {
        e.preventDefault()
        // 触发新建会话对话框 — 通过 CustomEvent 与 App 通信
        window.dispatchEvent(new CustomEvent('opsxshell:new-session'))
        return
      }

      // ---- Ctrl+K: 快速连接 ----
      if (matchesKeySequence(e, keys[KeybindingAction.SESSION_QUICK_CONNECT])) {
        e.preventDefault()
        window.dispatchEvent(new CustomEvent('opsxshell:quick-connect'))
        return
      }
    }

    window.addEventListener('keydown', handleKeyDown)
    return () => window.removeEventListener('keydown', handleKeyDown)
  }, [])
}

// 导出匹配函数供测试使用
export { isNativeEditingShortcut, matchesKeySequence }

export default useKeyboardShortcuts