import Dexie, { type Table } from 'dexie'

export interface Project {
  id?: number
  name: string
  archived: number
  created_at: string
}

export interface WorkLog {
  id?: number
  date: string
  created_at: string
}

export interface LogItem {
  id?: number
  work_log_id: number
  content: string
  project_id: number | null
  category: string
  minutes: number | null
  is_milestone: number
  needs_followup: number
  takeaway: string | null
  remark: string | null
  sort_order: number
  created_at: string
}

export interface Attendance {
  id?: number
  date: string
  clock_in_at: string | null
  clock_out_at: string | null
  kind: string
  note: string | null
  location?: string | null
  created_at: string
}

export interface WeeklyNote {
  id?: number
  week_start: string
  highlights: string | null
  challenges: string | null
  plan_next: string | null
  created_at: string
}

export interface Goal {
  id?: number
  title: string             // 长期计划，如：学完产品文档 / 本月健身 20 次
  kind: string
  start_date: string        // YYYY-MM-DD
  end_date: string
  note: string | null
  uuid: string
  created_at: string
  updated_at: string
}

export interface PlanItem {
  id?: number
  date: string              // YYYY-MM-DD
  start_time: string        // HH:mm
  end_time: string          // HH:mm
  title: string             // 计划内容，如：产品学习 / 健身
  kind: string              // 类别：学习 / 健身 / 自律 / 其他自定义
  note: string | null
  status: string            // todo | done | skip
  actual_minutes: number    // 计时时钟累计的实际投入分钟
  timer_started_at: string | null
  goal_id: number | null    // 来源长期计划（本地 id）
  uuid: string
  created_at: string
  updated_at: string
}

export interface Memo {
  id?: number
  title: string
  content: string
  created_at: string
  updated_at: string
}

export interface Credential {
  id?: number
  system: string
  account: string
  password: string
  remark: string
  created_at: string
  updated_at: string
}

export interface Transaction {
  id?: number
  type: string            // income | expense
  category: string
  amount: number          // 单位：分
  date: string            // YYYY-MM-DD
  note: string
  reimbursable: number    // 支出是否需要报销
  reimbursed: number      // 是否已报销
  created_at: string
}

// 同步镜像：记录上次同步时每条数据的哈希，用于增量差异检测
export interface SyncMirror {
  id?: number
  table: string
  uuid: string
  hash: string
}

// 删除墓碑：同步时告知其他端该记录已删除
export interface SyncTombstone {
  id?: number
  table: string
  uuid: string
  deleted_at: string
}

export class WorklogDB extends Dexie {
  project!: Table<Project, number>
  work_log!: Table<WorkLog, number>
  log_item!: Table<LogItem, number>
  attendance!: Table<Attendance, number>
  weekly_note!: Table<WeeklyNote, number>
  setting!: Table<{ key: string; value: string }, string>
  memo!: Table<Memo, number>
  credential!: Table<Credential, number>
  // 注意：transaction 表通过 db.table('transaction') 访问，
  // 因为 db.transaction 会与 Dexie 内置的 transaction() 方法冲突
  sync_mirror!: Table<SyncMirror, number>
  tombstone!: Table<SyncTombstone, number>
  plan!: Table<PlanItem, number>
  goal!: Table<Goal, number>

  constructor(dbName = 'intern_worklog') {
    super(dbName)
    this.version(1).stores({
      project: '++id, &name, archived',
      work_log: '++id, &date',
      log_item: '++id, work_log_id, project_id, category',
      attendance: '++id, &date',
      weekly_note: '++id, &week_start',
      setting: 'key'
    })
    this.version(2).stores({
      memo: '++id, updated_at',
      credential: '++id, system, updated_at'
    })
    this.version(3).stores({
      transaction: '++id, date, type, category'
    })
    this.version(4).stores({
      sync_mirror: '++id, table, uuid',
      tombstone: '++id, table, uuid, deleted_at'
    })
    this.version(5).stores({
      plan: '++id, date, status'
    }).upgrade(async tx => {
      // 旧固定分类 key 迁移为用户自定义分类标签（v0.4.0 起分类为用户数据）
      const map: Record<string, string> = {
        dev: '项目实操',
        test: '项目实操',
        bugfix: '售后服务',
        learning: '产品学习',
        meeting: '打杂',
        doc: '打杂',
        other: '打杂'
      }
      await tx.table('log_item').toCollection().modify((item: { category?: string }) => {
        if (item.category && map[item.category]) item.category = map[item.category]
      })
    })
    this.version(6).stores({
      plan: '++id, date, status, goal_id',
      goal: '++id, start_date'
    })
  }
}

// 当前登录用户绑定的数据库实例：不同用户物理隔离不同库，登录后由 auth 模块注入
export let db: WorklogDB | undefined

export function bindDatabase(instance: WorklogDB): void {
  db = instance
}

export function unbindDatabase(): void {
  if (db) db.close()
  db = undefined
}

export const SCHEMA_VERSION = 6

export const EXPENSE_CATEGORIES: string[] = ['餐饮', '交通', '住房', '通讯', '学习', '娱乐', '其他']
export const INCOME_CATEGORIES: string[] = ['工资', '报销', '其他']

export const DEFAULT_LOCATIONS: string[] = ['公司', '客户现场', '出差', '居家办公']

// 旧版固定分类 key → 默认标签的映射（仅用于历史数据迁移与展示兜底）
export const LEGACY_CATEGORY_LABELS: Record<string, string> = {
  dev: '项目实操',
  test: '项目实操',
  bugfix: '售后服务',
  learning: '产品学习',
  meeting: '打杂',
  doc: '打杂',
  other: '打杂'
}

// v0.4.0 起分类即用户自定义标签本身；历史 key 在此直通转换
export function categoryLabel(key: string): string {
  return LEGACY_CATEGORY_LABELS[key] || key
}