import { query } from '../../db/client.js'
import { TASK_STATUS } from '../../domain/task-status.js'
import { nowIso } from '../../utils/time.js'
import type { JsonObject } from '../../types/json.js'

export async function getAdminDashboardSummary() {
  const { todayStartIso, tomorrowStartIso } = resolveChinaTodayRange(nowIso())
  const paidPendingClaimStatuses = [
    TASK_STATUS.PAID,
    TASK_STATUS.LINK_GENERATED,
    TASK_STATUS.PENDING_BINDING_PREPARE,
    TASK_STATUS.WAITING_BINDING,
  ]
  const claimingStatuses = [TASK_STATUS.CLAIMED, TASK_STATUS.ROLE_CONFIRMED, TASK_STATUS.REDEEMING]
  const abnormalStatuses = [TASK_STATUS.RETRY_PENDING, TASK_STATUS.MANUAL_REVIEW]
  const result = await query(
    `
      SELECT
        (
          SELECT COUNT(*)::int
          FROM orders
          WHERE created_at >= $1 AND created_at < $2
        ) AS today_orders,
        (
          SELECT COUNT(*)::int
          FROM fulfillment_tasks
          WHERE task_status = ANY($3::text[])
        ) AS paid_pending_claim,
        (
          SELECT COUNT(*)::int
          FROM fulfillment_tasks
          WHERE task_status = ANY($4::text[])
        ) AS claiming_tasks,
        (
          SELECT COUNT(*)::int
          FROM fulfillment_tasks
          WHERE task_status = $5
            AND updated_at >= $1 AND updated_at < $2
        ) AS redeemed_today,
        (
          SELECT COUNT(*)::int
          FROM fulfillment_tasks
          WHERE task_status = ANY($6::text[])
        ) AS abnormal_tasks
    `,
    [
      todayStartIso,
      tomorrowStartIso,
      paidPendingClaimStatuses,
      claimingStatuses,
      TASK_STATUS.REDEEMED,
      abnormalStatuses,
    ],
  )
  const summary: JsonObject = result.rows[0] || {}

  return {
    todayOrders: Number(summary?.today_orders || 0),
    paidPendingClaim: Number(summary?.paid_pending_claim || 0),
    claimingTasks: Number(summary?.claiming_tasks || 0),
    redeemedToday: Number(summary?.redeemed_today || 0),
    abnormalTasks: Number(summary?.abnormal_tasks || 0),
  }
}

/** 返回中国时区当天对应的 UTC 查询范围，便于使用时间索引。 */
function resolveChinaTodayRange(now: string) {
  const parts = new Intl.DateTimeFormat('en-US', {
    timeZone: 'Asia/Shanghai',
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
  })
    .formatToParts(new Date(now))
    .reduce<Record<string, string>>((result, part) => {
      result[part.type] = part.value
      return result
    }, {})
  const year = Number(parts.year || 0)
  const month = Number(parts.month || 1)
  const day = Number(parts.day || 1)
  const todayStart = Date.UTC(year || 0, (month || 1) - 1, day || 1, -8)
  const tomorrowStart = todayStart + 24 * 60 * 60 * 1000

  return {
    todayStartIso: new Date(todayStart).toISOString(),
    tomorrowStartIso: new Date(tomorrowStart).toISOString(),
  }
}