import type { Hono } from 'hono';
import type { RowDataPacket } from 'mysql2';
import type hydrogenPool from '../../db/hydrogen.js';
import type { cached } from './cache.js';
import {
  loadCustomerMonth,
  loadExternalCustomerMonth,
  loadExternalReceipts,
  loadRangePayments,
  loadStationDaily,
  loadStationDailyForStation,
  loadStationList,
  loadStationPaymentDaily,
  loadSummaryDaily,
  loadSummaryPaymentDaily,
} from './repository.js';
import { dateRangeClause, enumerateDateRange, resolveDateRange } from './query-model.js';

export interface HydrogenStationBoardDependencies {
  hydrogenPool: Pick<typeof hydrogenPool, 'query'>;
  cached: typeof cached;
}

function safeStationId(value: string | undefined): number | null {
  const parsed = Number(value);
  return Number.isInteger(parsed) && parsed > 0 ? parsed : null;
}

function numberValue(value: unknown): number {
  return Number(value) || 0;
}

// 单站接口没有租户入参，租户只能由服务端配置决定，不能接受浏览器传值。



// 单站经营看板只做只读聚合。列表仅返回所选区间内存在有效加氢记录的站点。
export function registerHydrogenStationBoardRoute(
  app: Hono,
  { hydrogenPool, cached }: HydrogenStationBoardDependencies,
) {
  app.get('/hydrogen/station-board', async (c) => {
    const range = resolveDateRange(
      'last15',
      c.req.query('startDate'),
      c.req.query('endDate'),
    );
    const stationId = safeStationId(c.req.query('stationId'));
    const force = c.req.query('force') === '1';
    const cacheKey = `hydrogen/station-board?start=${range.start}&end=${range.end}${stationId ? `&station=${stationId}` : ''}`;

    const data = await cached(cacheKey, async () => {
      const stationRows = await loadStationList(hydrogenPool, { start: range.start, end: range.end });

      const paymentRows = await loadRangePayments(hydrogenPool, { start: range.start, end: range.end });
      const summaryDailyRows = await loadSummaryDaily(hydrogenPool, { start: range.start, end: range.end });
      const stationDailyRows = await loadStationDaily(hydrogenPool, { start: range.start, end: range.end });
      const summaryPaymentDailyRows = await loadSummaryPaymentDaily(hydrogenPool, { start: range.start, end: range.end });
      const paymentByStation = new Map(paymentRows.map(row => [numberValue(row.stationId), row]));
      const dailyKgByStation = new Map<number, Map<string, number>>();
      for (const row of stationDailyRows) {
        const id = numberValue(row.stationId);
        const values = dailyKgByStation.get(id) ?? new Map<string, number>();
        values.set(String(row.date), numberValue(row.kg));
        dailyKgByStation.set(id, values);
      }
      const totalKg = stationRows.reduce((sum, row) => sum + numberValue(row.kg), 0);
      const stations = stationRows.map(row => {
        const id = numberValue(row.id);
        const payment = paymentByStation.get(id);
        return {
          id,
          name: String(row.name),
          province: String(row.province),
          city: String(row.city),
          kg: numberValue(row.kg),
          fee: numberValue(row.fee),
          recordCount: numberValue(row.recordCount),
          paymentAmount: numberValue(payment?.amount),
          paymentCount: numberValue(payment?.paymentCount),
          share: totalKg > 0 ? numberValue(row.kg) / totalKg : 0,
          latestLedgerTime: typeof row.latestLedgerTime === 'string' ? row.latestLedgerTime : null,
          latestPaymentDate: typeof payment?.latestPaymentDate === 'string' ? payment.latestPaymentDate : null,
          dailyKg: enumerateDateRange(range.start, range.end).map(date => ({
            date,
            kg: dailyKgByStation.get(id)?.get(date) ?? 0,
          })),
        };
      }).filter(station => station.recordCount > 0
        || station.name.includes('东鹏大道')
        || (station.name.includes('佛山南海') && station.name.includes('羚牛')));

      let selected = null;
      if (stationId) {
        const dailyRows = await loadStationDailyForStation(hydrogenPool, { stationId: stationId as number, start: range.start, end: range.end });
        const dailyPaymentRows = await loadStationPaymentDaily(hydrogenPool, { stationId: stationId as number, start: range.start, end: range.end });
        const paymentByDate = new Map(dailyPaymentRows.map(row => [String(row.date), row]));
        const ledgerByDate = new Map(dailyRows.map(row => [String(row.date), row]));
        let previousKg = 0;
        const daily = enumerateDateRange(range.start, range.end).map(date => {
          const ledger = ledgerByDate.get(date);
          const kg = numberValue(ledger?.kg);
          const payment = paymentByDate.get(date);
          const result = {
            date,
            kg,
            fee: numberValue(ledger?.fee),
            avgPrice: numberValue(ledger?.avgPrice),
            recordCount: numberValue(ledger?.recordCount),
            changeKg: kg - previousKg,
            paymentAmount: numberValue(payment?.amount),
            paymentCount: numberValue(payment?.paymentCount),
          };
          previousKg = kg;
          return result;
        });

        const customerMonthRows = await loadCustomerMonth(hydrogenPool, { stationId: stationId as number, end: range.end });
        const externalCustomerMonthRows = await loadExternalCustomerMonth(hydrogenPool, { stationId: stationId as number, end: range.end });
        const externalReceiptRows = await loadExternalReceipts(hydrogenPool, { start: range.start, end: range.end });
        selected = {
          daily,
          customerMonths: customerMonthRows.map(row => ({
            month: String(row.month),
            customerName: String(row.customerName),
            kg: numberValue(row.kg),
            fee: numberValue(row.fee),
            recordCount: numberValue(row.recordCount),
          })),
          externalCustomerMonths: externalCustomerMonthRows.map(row => ({
            month: String(row.month),
            customerName: String(row.customerName),
            kg: numberValue(row.kg),
            fee: numberValue(row.fee),
            recordCount: numberValue(row.recordCount),
          })),
          // 快照和手工充值都没有可靠站点归属，不能把客户级进账误报为当前站点收益。
          externalReceipts: {
            scope: 'customer',
            reason: '当前租户全部外部客户进账，不按站点归属，不计入本单站经营收益或现结 KPI。',
            rows: externalReceiptRows.map(row => ({
              id: String(row.id),
              date: String(row.date),
              customerName: String(row.customerName),
              amount: numberValue(row.amount),
              payMethod: String(row.payMethod),
              source: String(row.source),
              sourceRecordCount: numberValue(row.sourceRecordCount),
              updatedAt: typeof row.updatedAt === 'string' ? row.updatedAt : null,
            })),
          },
        };
      }

      const paymentTotal = stations.reduce((sum, station) => sum + station.paymentAmount, 0);
      const summaryLedgerByDate = new Map(summaryDailyRows.map(row => [String(row.date), row]));
      const summaryPaymentByDate = new Map(summaryPaymentDailyRows.map(row => [String(row.date), row]));
      const summaryDaily = enumerateDateRange(range.start, range.end).map(date => {
        const ledger = summaryLedgerByDate.get(date);
        const payment = summaryPaymentByDate.get(date);
        return {
          date,
          kg: numberValue(ledger?.kg),
          fee: numberValue(ledger?.fee),
          recordCount: numberValue(ledger?.recordCount),
          paymentAmount: numberValue(payment?.amount),
          paymentCount: numberValue(payment?.paymentCount),
        };
      });
      const latestLedgerTime = stations
        .map(station => station.latestLedgerTime)
        .filter((value): value is string => Boolean(value))
        .sort()
        .at(-1) ?? null;

      return {
        range,
        summary: {
          stationCount: stations.length,
          activeStationCount: stations.filter(station => station.kg > 0).length,
          totalKg,
          totalFee: stations.reduce((sum, station) => sum + station.fee, 0),
          recordCount: stations.reduce((sum, station) => sum + station.recordCount, 0),
          paymentAmount: paymentTotal,
          paymentCount: stations.reduce((sum, station) => sum + station.paymentCount, 0),
          latestLedgerTime,
          daily: summaryDaily,
        },
        stations,
        selected,
      };
    }, { force });

    return c.json(data);
  });
}