const Database = require('better-sqlite3')
const path = require('path')

const CORE_DB_PATH = path.join(process.cwd(), 'data', 'mp_time_assistant_core.db')

let db = null

const KIT_META = [
  {
    id: 'personal_collect',
    name: '微信收藏夹',
    description: '聊天图片 / 文件 / 文字收藏，标签搜索，软删除可追溯。独立部署，零共享。',
    icon: '📁',
    meta: 'API: /api/mp_personal_collect/ · DB: mp_personal_collect.db',
  },
  {
    id: 'rep_clock',
    name: '运动节拍 RepClock',
    description: 'HIIT / Yoga / 拉伸节奏倒计时，锚点时钟 + 女声播报，后台时间自动补偿。',
    icon: '⏱️',
    meta: 'API: /api/mp_rep_clock/ · DB: mp_rep_clock.db',
  },
]

const nowIso = () => new Date().toISOString()

const getDb = () => {
  if (db) return db
  db = new Database(CORE_DB_PATH)
  db.pragma('journal_mode = WAL')
  db.exec(`CREATE TABLE IF NOT EXISTS core_state (
    id INTEGER PRIMARY KEY CHECK (id = 1),
    active_kit TEXT,
    updated_at TEXT NOT NULL
  );`)
  db.prepare(`
    INSERT OR IGNORE INTO core_state (id, active_kit, updated_at)
    VALUES (1, NULL, ?)
  `).run(nowIso())
  return db
}

const getStateRow = () => {
  const row = getDb().prepare(`SELECT * FROM core_state WHERE id = 1 LIMIT 1`).get()
  if (!row) {
    getDb().prepare(`
      INSERT INTO core_state (id, active_kit, updated_at)
      VALUES (1, NULL, ?)
    `).run(nowIso())
    return getStateRow()
  }
  return row
}

const setActiveKit = kitId => {
  getDb().prepare(`UPDATE core_state SET active_kit = ?, updated_at = ? WHERE id = 1`).run(kitId || null, nowIso())
}

const serializeState = () => {
  const row = getStateRow()
  return {
    ok: true,
    activeKit: row.active_kit || null,
    active_kit: row.active_kit || null,
  }
}

const bindRoutes = app => {
  getDb()

  app.get('/api/mp_time_assistant/meta', (req, res) => {
    res.json({
      ok: true,
      appName: 'MpTimeAssistant',
      appNameZh: 'MilesYang时光助手',
      kits: KIT_META,
      notes: {
        'personal_collect_api_prefix': '/api/mp_personal_collect/kits/personal_collect',
        'rep_clock_api_prefix': '/api/mp_rep_clock/kits/rep_clock',
      },
    })
  })

  app.get('/api/mp_time_assistant/state', (req, res) => {
    res.json(serializeState())
  })

  app.put('/api/mp_time_assistant/state/active-kit', (req, res) => {
    try {
      const raw = String(req.body && req.body.kitId || req.body && req.body.kit_id || '').trim()
      const nextKit = raw || null
      setActiveKit(nextKit)
      return res.json({ ok: true, activeKit: nextKit, active_kit: nextKit })
    } catch (e) {
      return res.status(500).json({ ok: false, error: String(e.message || e) })
    }
  })
}

module.exports = { bindRoutes }