/**
 * KeybindingStore — 快捷键自定义系统状态管理
 *
 * 管理用户自定义快捷键映射：
 * - customKeybindings: { actionId: customKeys } — 仅存储用户修改的
 * - getEffectiveKeys(): 合并默认值和自定义值返回实际生效的键
 * - 冲突检测: 检测新键绑定是否与现有绑定冲突
 * - 持久化: 通过 electronAPI.settingsSet 保存到 SQLite
 *
 * @module stores/keybindingStore
 */

import { create } from 'zustand'
import { createLogger } from '../utils/logger'
import {
  KEYBINDING_DEFINITIONS,
  getKeybindingDefinition,
  type KeybindingActionId,
  type KeybindingDefinition,
} from '../constants/keybindings'

const logger = createLogger('KeybindingStore')

// ─── 类型 ──────────────────────────────────────────────

/** 自定义键绑定映射 (仅存储用户修改的) */
export type CustomKeybindings = Record<KeybindingActionId, string>

interface KeybindingState {
  /** 自定义键绑定 (仅存储与默认不同的) */
  customKeybindings: CustomKeybindings
  /** 是否已从持久化加载 */
  isLoaded: boolean

  // Actions
  /** 从 electronAPI 加载自定义快捷键 */
  loadFromSettings: () => Promise<void>
  /** 获取操作的有效键绑定 (自定义优先，否则默认) */
  getEffectiveKeys: (actionId: KeybindingActionId) => string
  /** 获取所有操作的有效键绑定映射 */
  getAllEffective: () => Record<KeybindingActionId, string>
  /** 设置自定义键绑定 */
  setCustomKeybinding: (actionId: KeybindingActionId, keys: string) => Promise<void>
  /** 重置单个操作为默认 */
  resetKeybinding: (actionId: KeybindingActionId) => Promise<void>
  /** 重置所有为默认 */
  resetAll: () => Promise<void>
  /** 检测冲突 — 返回与新键绑定冲突的其他操作列表 */
  getConflicts: (actionId: KeybindingActionId, keys: string) => KeybindingDefinition[]
  /** 规范化键序列 (统一修饰键顺序和大小写) */
  normalizeKeySequence: (raw: string) => string
}

// ─── Store ─────────────────────────────────────────────

export const useKeybindingStore = create<KeybindingState>((set, get) => ({
  customKeybindings: {} as CustomKeybindings,
  isLoaded: false,

  loadFromSettings: async () => {
    try {
      const result = await window.electronAPI?.settingsGet('keybindings')
      if (result?.success && result.value && typeof result.value === 'object') {
        set({ customKeybindings: result.value as CustomKeybindings, isLoaded: true })
      } else {
        set({ isLoaded: true })
      }
    } catch (error) {
      logger.error('Failed to load keybindings:', error)
      set({ isLoaded: true })
    }
  },

  getEffectiveKeys: (actionId: KeybindingActionId) => {
    const { customKeybindings } = get()
    const custom = customKeybindings[actionId]
    if (custom && custom.trim()) return custom
    const def = getKeybindingDefinition(actionId)
    return def?.defaultKeys ?? ''
  },

  getAllEffective: () => {
    const { customKeybindings } = get()
    const result = {} as Record<KeybindingActionId, string>
    for (const def of KEYBINDING_DEFINITIONS) {
      const custom = customKeybindings[def.id]
      result[def.id] = custom && custom.trim() ? custom : def.defaultKeys
    }
    return result
  },

  setCustomKeybinding: async (actionId: KeybindingActionId, keys: string) => {
    const newCustoms = { ...get().customKeybindings, [actionId]: keys }
    set({ customKeybindings: newCustoms })
    try {
      await window.electronAPI?.settingsSet('keybindings', newCustoms)
    } catch (error) {
      logger.error('Failed to persist keybinding:', error)
    }
  },

  resetKeybinding: async (actionId: KeybindingActionId) => {
    const { [actionId]: _, ...rest } = get().customKeybindings
    set({ customKeybindings: rest as CustomKeybindings })
    try {
      await window.electronAPI?.settingsSet('keybindings', rest)
    } catch (error) {
      logger.error('Failed to persist keybinding reset:', error)
    }
  },

  resetAll: async () => {
    set({ customKeybindings: {} as CustomKeybindings })
    try {
      await window.electronAPI?.settingsSet('keybindings', {})
    } catch (error) {
      logger.error('Failed to persist keybinding resetAll:', error)
    }
  },

  getConflicts: (actionId: KeybindingActionId, keys: string) => {
    if (!keys || !keys.trim()) return []
    // 特殊处理: Ctrl+1…9 范围键不参与冲突检测
    if (keys.includes('…') || keys.includes('...')) return []

    const normalizedInput = get().normalizeKeySequence(keys)
    const conflicts: KeybindingDefinition[] = []

    for (const def of KEYBINDING_DEFINITIONS) {
      // 跳过自身
      if (def.id === actionId) continue
      // 跳过范围键
      if (def.defaultKeys.includes('…') || def.defaultKeys.includes('...')) continue

      const effectiveKeys = get().getEffectiveKeys(def.id)
      // 跳过范围键的有效值
      if (effectiveKeys.includes('…') || effectiveKeys.includes('...')) continue

      const normalizedExisting = get().normalizeKeySequence(effectiveKeys)
      if (normalizedExisting === normalizedInput) {
        conflicts.push(def)
      }
    }

    return conflicts
  },

  normalizeKeySequence: (raw: string) => {
    if (!raw) return ''
    // 分割、去空格、统一大小写
    const parts = raw
      .split('+')
      .map((p) => p.trim())
      .filter(Boolean)
      .map((p) => {
        const lower = p.toLowerCase()
        // Meta → Ctrl (跨平台统一)
        if (lower === 'meta' || lower === 'cmd') return 'Ctrl'
        // 修饰键首字母大写
        if (lower === 'ctrl' || lower === 'control') return 'Ctrl'
        if (lower === 'shift') return 'Shift'
        if (lower === 'alt' || lower === 'option') return 'Alt'
        // 普通键：首字母大写其余小写 (如 Tab, Enter, F11)
        return p.charAt(0).toUpperCase() + p.slice(1).toLowerCase()
      })

    // 排序: Ctrl > Shift > Alt > 其他键
    const modifierOrder: Record<string, number> = { Ctrl: 0, Shift: 1, Alt: 2 }
    parts.sort((a, b) => {
      const aOrder = modifierOrder[a] ?? 99
      const bOrder = modifierOrder[b] ?? 99
      return aOrder - bOrder
    })

    return parts.join('+')
  },
}))

export default useKeybindingStore