// apizero 代理路由 (前端不直接调 apizero, 一律走后端, key 不外泄)
//
//   GET /api/apizero/oil/forecast        - 油价 + 预测 (实时)
//   GET /api/apizero/oil/price-all       - 32 省油价
//   GET /api/apizero/oil/price?province= - 单省油价
//   GET /api/apizero/oil/schedule?year=  - 某年调价日历 (按年缓存)
//
// 错误: apizero 错误统一包成 502 (上游错误) 或 400 (参数错误)
import { Router } from 'express'
import { authRequired } from '../middleware.js'
import { ApizeroError, oil, history } from '../apizero/index.js'

const router = Router()
router.use(authRequired)

function handleApizeroError(e, res, next) {
  if (e instanceof ApizeroError) {
    // 参数错 -> 400, 上游错 -> 502, QPS 限流 / 额度用完 -> 503
    if (e.httpStatus === 400) return res.status(400).json({ error: e.message, apizero_code: e.code })
    if (e.code === 4029 || e.code === 4030) return res.status(503).json({ error: e.message, apizero_code: e.code })
    return res.status(502).json({ error: e.message, apizero_code: e.code })
  }
  next(e)
}

// 实时: 油价 + 国际原油 + 下次调价预测
router.get('/apizero/oil/forecast', async (req, res, next) => {
  try { res.json(await oil.getForecast()) }
  catch (e) { handleApizeroError(e, res, next) }
})

// 32 省油价
router.get('/apizero/oil/price-all', async (req, res, next) => {
  try { res.json(await oil.getPriceAll()) }
  catch (e) { handleApizeroError(e, res, next) }
})

// 单省油价
router.get('/apizero/oil/price', async (req, res, next) => {
  try { res.json(await oil.getPrice(req.query.province)) }
  catch (e) { handleApizeroError(e, res, next) }
})

// 调价日历 (按年缓存)
router.get('/apizero/oil/schedule', async (req, res, next) => {
  try { res.json(await oil.getSchedule(req.query.year)) }
  catch (e) { handleApizeroError(e, res, next) }
})

export default router

// 浙江省油价历史 (DB)
//   GET /api/apizero/oil/history?fuel=92&days=180
//     - fuel: 92 / 95 / 0 (留空 = 3 个油品都返回)
//     - days: 默认 180 (半年)
router.get('/apizero/oil/history', async (req, res, next) => {
  try {
    const fuel = req.query.fuel ? String(req.query.fuel) : undefined
    const days = Math.max(1, Math.min(Number(req.query.days) || 180, 730))
    const items = await history.query({ fuel, days })
    res.json({ items, fuel: fuel || 'all', days })
  } catch (e) { next(e) }
})