import type { Hono } from 'hono';
import type { RowDataPacket } from 'mysql2';
import type hydrogenPool from '../../hydrogen-db.js';
import type { cached } from './cache.js';
import { HYDROGEN_FUEL_ONLY_WHERE_B, HYDROGEN_LOCAL, HYDROGEN_TABLE } from './constants.js';
import { customerClause, type CustomerKind } from './query-model.js';

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

const YMD = /^\d{4}-\d{2}-\d{2}$/;

export function registerHydrogenDailyDetailRoute(
  app: Hono,
  { hydrogenPool, cached }: HydrogenDailyDetailDependencies,
) {
  app.get('/hydrogen/daily-detail', async (c) => {
    const date = c.req.query('date') || '';
    if (!YMD.test(date)) return c.json({ error: 'date must be YYYY-MM-DD' }, 400);
    const customer = (c.req.query('customer') || 'all') as CustomerKind;
    const verifyScope = c.req.query('verifyScope') === 'verified' ? 'verified' : 'all';
    const force = c.req.query('force') === '1';
    const stationValue = Number(c.req.query('stationId'));
    const stationId = Number.isInteger(stationValue) && stationValue > 0 ? stationValue : null;
    const stationClause = stationId ? ' AND b.station_id = ?' : '';
    const params: unknown[] = [date, ...(stationId ? [stationId] : [])];

    const data = await cached(
      `hydrogen/daily-detail?date=${date}&customer=${customer}${stationId ? `&station=${stationId}` : ''}${verifyScope === 'verified' ? '&verify=verified' : ''}`,
      async () => {
        const [rows] = await hydrogenPool.query<RowDataPacket[]>(
          `SELECT b.id,
                  DATE_FORMAT(b.${HYDROGEN_LOCAL}, '%H:%i') AS time,
                  COALESCE(b.station_id, 0) AS stationId,
                  COALESCE(s.station_short_name, s.station_name, b.station_name, '未关联站点') AS stationName,
                  COALESCE(s.station_type, 'unknown') AS stationType,
                  COALESCE(b.system_customer_id, b.customer_id, 0) AS customerId,
                  COALESCE(NULLIF(b.system_customer_name, ''), NULLIF(b.customer_name, ''), '未关联客户') AS customerName,
                  COALESCE(NULLIF(b.license_plate, ''), '无车牌') AS plateNo,
                  b.vehicle_id AS vehicleId,
                  COALESCE(NULLIF(b.record_source, ''), CAST(b.source AS CHAR), '未知来源') AS source,
                  COALESCE(NULLIF(b.verify_status, ''), 'UNVERIFIED') AS verifyStatus,
                  ROUND(COALESCE(b.cost_price, 0), 2) AS unitPrice,
                  ROUND(COALESCE(b.amount_kg, 0), 3) AS kg,
                  ROUND(COALESCE(b.cost_total, 0), 2) AS fee
           FROM ${HYDROGEN_TABLE} b
           LEFT JOIN hydrogen_station s ON s.id = b.station_id AND s.del_flag = '0'
           WHERE ${HYDROGEN_FUEL_ONLY_WHERE_B}
             AND DATE(b.${HYDROGEN_LOCAL}) = ?
             AND ${customerClause(customer).replaceAll('vehicle_id', 'b.vehicle_id')}${verifyScope === 'verified' ? " AND LOWER(COALESCE(NULLIF(TRIM(b.verify_status), ''), 'unverified')) = 'verified'" : ''}${stationClause}
           ORDER BY b.${HYDROGEN_LOCAL} ASC, b.id ASC
           LIMIT 3000`,
          params,
        );

        type Vehicle = {
          id: string;
          time: string;
          plateNo: string;
          vehicleScope: 'lingniu' | 'external';
          source: string;
          verifyStatus: string;
          unitPrice: number;
          kg: number;
          fee: number;
        };
        type Customer = { id: number; name: string; kg: number; fee: number; vehicles: Vehicle[] };
        type Station = { id: number; name: string; stationType: string; kg: number; fee: number; customers: Map<number, Customer> };
        const stations = new Map<number, Station>();

        for (const row of rows) {
          const currentStationId = Number(row.stationId) || 0;
          const currentCustomerId = Number(row.customerId) || 0;
          let station = stations.get(currentStationId);
          if (!station) {
            station = { id: currentStationId, name: String(row.stationName), stationType: String(row.stationType), kg: 0, fee: 0, customers: new Map() };
            stations.set(currentStationId, station);
          }
          let customerRow = station.customers.get(currentCustomerId);
          if (!customerRow) {
            customerRow = { id: currentCustomerId, name: String(row.customerName), kg: 0, fee: 0, vehicles: [] };
            station.customers.set(currentCustomerId, customerRow);
          }
          const kg = Number(row.kg) || 0;
          const fee = Number(row.fee) || 0;
          station.kg += kg;
          station.fee += fee;
          customerRow.kg += kg;
          customerRow.fee += fee;
          customerRow.vehicles.push({
            // Ledger ids can exceed Number.MAX_SAFE_INTEGER. Keep the database
            // identifier lossless so the final vehicle/source drill-down has
            // stable React keys.
            id: String(row.id),
            time: String(row.time),
            plateNo: String(row.plateNo),
            vehicleScope: row.vehicleId === null || row.vehicleId === undefined ? 'external' : 'lingniu',
            source: String(row.source),
            verifyStatus: String(row.verifyStatus),
            unitPrice: Number(row.unitPrice) || 0,
            kg,
            fee,
          });
        }

        // `new_hydrogen_site_balance_record` is the only persisted station-balance
        // source. It is intentionally queried separately so a missing balance record
        // stays null instead of becoming a fabricated zero balance.
        const stationIds = [...stations.keys()].filter(id => id > 0);
        const balances = new Map<number, { amount: number; effectiveTime: string | null }>();
        if (stationIds.length > 0) {
          const placeholders = stationIds.map(() => '?').join(', ');
          const [balanceRows] = await hydrogenPool.query<RowDataPacket[]>(
            `SELECT r.site_id AS stationId,
                    r.ending_balance AS amount,
                    DATE_FORMAT(r.effective_time, '%Y-%m-%d %H:%i:%s') AS effectiveTime
             FROM new_hydrogen_site_balance_record r
             INNER JOIN (
               SELECT site_id, MAX(effective_time) AS maxEffectiveTime
               FROM new_hydrogen_site_balance_record
               WHERE del_flag = '0' AND effective_time < DATE_ADD(?, INTERVAL 1 DAY)
                 AND site_id IN (${placeholders})
               GROUP BY site_id
             ) latest ON latest.site_id = r.site_id AND latest.maxEffectiveTime = r.effective_time
             WHERE r.del_flag = '0'`,
            [date, ...stationIds],
          );
          for (const row of balanceRows) {
            balances.set(Number(row.stationId), {
              amount: Number(row.amount),
              effectiveTime: row.effectiveTime === null || row.effectiveTime === undefined ? null : String(row.effectiveTime),
            });
          }
        }

        return {
          date,
          recordCount: rows.length,
          stations: [...stations.values()].map(station => ({
            ...station,
            balance: balances.get(station.id)?.amount ?? null,
            balanceEffectiveTime: balances.get(station.id)?.effectiveTime ?? null,
            customers: [...station.customers.values()],
          })),
        };
      },
      { force },
    );
    return c.json(data);
  });
}