import { Router, type Request, type Response } from 'express'
import { listFactories, listOrders } from '../db.js'
import { requireAuth } from '../middleware/requireAuth.js'

const router = Router()

router.use(requireAuth)

const cleanText = (v: unknown): string => {
  if (v === null || v === undefined) return ''
  return String(v).replace(/\u00A0/g, ' ').replace(/[\s\u3000]+/g, ' ').trim()
}

const isDone = (status: string): boolean => {
  const s = cleanText(status)
  if (!s) return false
  return /完成|已出完|出完|结束|已完成/.test(s)
}

const isCanceled = (status: string): boolean => {
  const s = cleanText(status)
  if (!s) return false
  return /取消|作废/.test(s)
}

const normalizeStage = (status: string): string => {
  const s = cleanText(status)
  if (!s) return '未填写'
  if (isCanceled(s)) return '取消'
  if (isDone(s)) return '完成'
  if (/验货|驗貨|待验货|已验货/.test(s)) return '验货'
  if (/订舱|訂艙|订仓|订仓/.test(s)) return '订舱'
  if (/包材|唛头|嘜頭/.test(s)) return '包材唛头'
  if (/不干胶|外箱/.test(s)) return '外箱不干胶'
  if (/出货|出運|出运|发货|發貨|已出货|待送货/.test(s)) return '出货'
  if (/生产|待生产|排版|催大货样/.test(s)) return '生产'
  if (/下单|下單/.test(s)) return '下单'
  return '其他'
}

const dateKey = (s?: string): string => {
  const v = cleanText(s)
  return v ? v.slice(0, 10) : ''
}

const lastNDaysKeys = (n: number): string[] => {
  const out: string[] = []
  const now = new Date()
  now.setHours(0, 0, 0, 0)
  for (let i = n - 1; i >= 0; i -= 1) {
    const d = new Date(now)
    d.setDate(d.getDate() - i)
    out.push(d.toISOString().slice(0, 10))
  }
  return out
}

router.get('/dashboard', async (_req: Request, res: Response): Promise<void> => {
  const orders = await listOrders()
  const factories = await listFactories()
  const today = new Date().toISOString().slice(0, 10)

  const active = orders.filter((o) => !isDone(o.orderProgress) && !isCanceled(o.orderProgress))
  const totalAmount = orders.reduce((sum, o) => sum + (o.orderAmount ?? 0), 0)
  const overdue = active.filter((o) => {
    const due = dateKey(o.customerDeliveryDate)
    if (!due) return false
    return due < today
  })

  const statusMap = new Map<string, number>()
  for (const o of orders) {
    const stage = normalizeStage(o.orderProgress)
    statusMap.set(stage, (statusMap.get(stage) ?? 0) + 1)
  }
  const statusDist = Array.from(statusMap.entries()).map(([name, value]) => ({
    name,
    value,
  }))

  const factoryNameById = new Map(factories.map((f) => [f.id, f.name]))
  const factoryMap = new Map<string, number>()
  for (const o of orders) {
    const key = (o.factoryId ? factoryNameById.get(o.factoryId) : undefined) ?? '未指定'
    factoryMap.set(key, (factoryMap.get(key) ?? 0) + 1)
  }
  const factoryDist = Array.from(factoryMap.entries()).map(([name, value]) => ({
    name,
    value,
  }))

  const days = lastNDaysKeys(30)
  const seriesMap = new Map(days.map((d) => [d, { date: d, amount: 0, count: 0 }]))
  for (const o of orders) {
    const d = dateKey(o.orderDate) || dateKey(o.createdAt)
    if (!d || !seriesMap.has(d)) continue
    const row = seriesMap.get(d)!
    row.amount += o.orderAmount ?? 0
    row.count += 1
  }

  const series = days.map((d) => seriesMap.get(d)!)

  res.json({
    success: true,
    data: {
      kpis: {
        totalOrders: orders.length,
        activeOrders: active.length,
        overdueOrders: overdue.length,
        totalAmount,
      },
      charts: {
        statusDist,
        factoryDist,
        trend: series,
      },
    },
  })
})

export default router