const { query } = require('../lib/db')
const { ok, fail } = require('../lib/response')
const { requireUser } = require('../lib/auth')
const { writeLog } = require('../lib/log')

function toMysqlDate(value) {
  if (!value) return null
  const d = new Date(value)
  if (Number.isNaN(d.getTime())) return null
  return d.toISOString().slice(0, 19).replace('T', ' ')
}

function register(router) {
  function limitClause(pageSize, offset) {
    return ' LIMIT ' + Number(pageSize) + ' OFFSET ' + Number(offset)
  }

  router.get('/api/v1/treatment/history', async ctx => {
    const user = await requireUser(ctx)
    if (!user) return fail(1001, 'invalid_token')
    const page = Math.max(1, parseInt(ctx.query.page, 10) || 1)
    const pageSize = Math.min(Math.max(1, parseInt(ctx.query.page_size, 10) || 20), 100)
    const offset = (page - 1) * pageSize
    const total = await query('SELECT COUNT(*) AS total FROM treatment_records WHERE user_id = :user_id', { user_id: user.user_id })
    const records = await query('SELECT * FROM treatment_records WHERE user_id = :user_id ORDER BY created_at DESC' + limitClause(pageSize, offset), { user_id: user.user_id })
    return ok({ total: total[0].total, page, page_size: pageSize, records })
  })

  router.post('/api/v1/treatment/sync', async ctx => {
    const user = await requireUser(ctx)
    if (!user) return fail(1001, 'invalid_token')
    const d = ctx.body || {}
    if (!d.device_id) return fail(2001, 'device_id required')
    const sessionId = d.session_id || 'SESS' + Date.now()
    await query(
      `INSERT INTO treatment_records
       (session_id, device_id, user_id, start_time, end_time, regions, total_duration_ms, mode, avg_pd, battery, temperature, wavelength, brightness, pd_json)
       VALUES (:session_id, :device_id, :user_id, :start_time, :end_time, :regions, :total_duration_ms, :mode, :avg_pd, :battery, :temperature, :wavelength, :brightness, :pd_json)
       ON DUPLICATE KEY UPDATE end_time = VALUES(end_time), total_duration_ms = VALUES(total_duration_ms), avg_pd = VALUES(avg_pd), battery = VALUES(battery), temperature = VALUES(temperature), pd_json = VALUES(pd_json)`,
      {
        session_id: sessionId,
        device_id: d.device_id,
        user_id: user.user_id,
        start_time: toMysqlDate(d.start_time),
        end_time: toMysqlDate(d.end_time),
        regions: Array.isArray(d.regions) ? d.regions.join(',') : String(d.regions || ''),
        total_duration_ms: parseInt(d.total_duration_ms, 10) || 0,
        mode: parseInt(d.mode, 10) || 0,
        avg_pd: Number(d.avg_pd) || 0,
        battery: d.battery == null ? null : parseInt(d.battery, 10),
        temperature: d.temperature == null ? null : parseInt(d.temperature, 10),
        wavelength: d.wavelength == null ? null : parseInt(d.wavelength, 10),
        brightness: d.brightness == null ? null : parseInt(d.brightness, 10),
        pd_json: JSON.stringify(d.pd_values || {})
      }
    )
    await query('UPDATE devices SET battery = COALESCE(:battery, battery), temperature = COALESCE(:temperature, temperature), last_online_at = NOW() WHERE device_id = :device_id', {
      device_id: d.device_id,
      battery: d.battery == null ? null : parseInt(d.battery, 10),
      temperature: d.temperature == null ? null : parseInt(d.temperature, 10)
    })
    await writeLog({ user_id: user.user_id, action: 'treatment_sync', detail: '同步护理记录: ' + sessionId, ip: ctx.ip })
    return ok({ record_id: sessionId })
  })
}

module.exports = register