import { Hono } from 'hono';
import type { RowDataPacket } from 'mysql2';
import mysqlPool from '../../db/mysql.js';
import type { AuthUser } from '../../auth/types.js';
import { canAccessEnergy } from '../../auth/types.js';
import { recentDayRange } from '../../../shared/date-range.js';
import {
  buildHydrogenPoints,
  filterHydrogenStationsByRadius,
  HEATMAP_DEFAULT_WINDOW_DAYS,
  parseHydrogenHeatmapQuery,
  parseNearbyQuery,
  rankHydrogenStations,
  serializeHydrogenStation,
} from './model.js';
import {
  buildWhere,
  loadMetaProfile,
  loadNearbySummary,
  loadPointsSummary,
  loadStationOptions,
  loadStations,
  type MysqlDatabase,
} from './repository.js';

export interface HydrogenHeatmapDependencies {
  mysql: MysqlDatabase;
}

export function registerHydrogenHeatmapRoutes(app: Hono, deps: HydrogenHeatmapDependencies): void {
  const { mysql } = deps;

  // 加氢热力图受能源角色控制（fail-closed）。
  app.use('*', async (c, next) => {
    const user = (c as { get: (key: string) => unknown }).get('user') as AuthUser | undefined;
    if (!canAccessEnergy(user?.roles)) {
      return c.json({ error: 'Forbidden: 能源管理访问需要 BI-LEADER-ENERGY 角色' }, 403);
    }
    return next();
  });

  app.get('/config', (c) => {
    const key = process.env.AMAP_WEB_KEY;
    const securityCode = process.env.AMAP_SECURITY_JS_CODE;
    if (!key || !securityCode) return c.json({ error: '高德地图配置缺失' }, 503);
    return c.json({ key, securityCode });
  });

  app.get('/meta', async (c) => {
    const [profileRows, optionRows] = await Promise.all([
      loadMetaProfile(mysql),
      loadStationOptions(mysql),
    ]);
    const profile = profileRows[0] || {};
    const totalRefuelCount = Number(profile.total_refuel_count) || 0;
    const eligibleRefuelCount = Number(profile.eligible_refuel_count) || 0;
    const fallback = recentDayRange(HEATMAP_DEFAULT_WINDOW_DAYS);
    return c.json({
      startDate: profile.start_date || fallback.start,
      endDate: profile.end_date || fallback.end,
      totalRefuelCount,
      eligibleRefuelCount,
      excludedRefuelCount: Math.max(0, totalRefuelCount - eligibleRefuelCount),
      gpsCoverageRate: totalRefuelCount ? eligibleRefuelCount / totalRefuelCount : 0,
      totalKg: Number(profile.total_kg) || 0,
      eligibleKg: Number(profile.eligible_kg) || 0,
      vehicleCount: Number(profile.vehicle_count) || 0,
      totalStationCount: Number(profile.total_station_count) || 0,
      eligibleStationCount: Number(profile.eligible_station_count) || 0,
      stations: optionRows.map((row) => ({
        stationId: String(row.station_id),
        stationName: String(row.station_name),
      })),
    });
  });

  app.get('/points', async (c) => {
    const { startDate, endDate, query, payer, metric } = parseHydrogenHeatmapQuery({
      startDate: c.req.query('startDate'),
      endDate: c.req.query('endDate'),
      query: c.req.query('query'),
      payer: c.req.query('payer'),
      metric: c.req.query('metric'),
    });
    if (startDate > endDate) return c.json({ error: '开始日期不能晚于结束日期' }, 400);
    const stations = await loadStations(mysql, startDate, endDate, query, payer);
    const ranked = rankHydrogenStations(stations, metric);
    const { points, max } = buildHydrogenPoints(ranked, metric);
    const summaryRows = await loadPointsSummary(mysql, buildWhere(startDate, endDate, query, payer));
    const summary = summaryRows[0] || {};
    return c.json({
      startDate,
      endDate,
      metric,
      payer,
      kg: Number(summary.kg) || 0,
      refuelCount: Number(summary.refuel_count) || 0,
      vehicleCount: Number(summary.vehicle_count) || 0,
      stationCount: Number(summary.station_count) || 0,
      dayCount: Number(summary.day_count) || 0,
      points,
      max,
      topStations: ranked.slice(0, 10).map((row) => serializeHydrogenStation(row, metric)),
    });
  });

  app.get('/nearby', async (c) => {
    const { center, radiusKm } = parseNearbyQuery({
      lng: c.req.query('lng'),
      lat: c.req.query('lat'),
      radiusKm: c.req.query('radiusKm'),
    });
    if (!center) return c.json({ error: '经纬度参数无效' }, 400);
    const { startDate, endDate, query, payer, metric } = parseHydrogenHeatmapQuery({
      startDate: c.req.query('startDate'),
      endDate: c.req.query('endDate'),
      query: c.req.query('query'),
      payer: c.req.query('payer'),
      metric: c.req.query('metric'),
    });
    const stations = await loadStations(mysql, startDate, endDate, query, payer);
    const nearby = filterHydrogenStationsByRadius(stations, center, radiusKm);
    const nearbyIds = nearby.map((row) => row.station_id);
    let nearbySummary: { kg: number; refuelCount: number; vehicleCount: number; stationCount: number } = {
      kg: 0, refuelCount: 0, vehicleCount: 0, stationCount: 0,
    };
    if (nearbyIds.length) {
      const placeholders = nearbyIds.map(() => '?').join(',');
      const rows = await loadNearbySummary(
        mysql,
        buildWhere(startDate, endDate, query, payer),
        placeholders,
        nearbyIds,
      );
      nearbySummary = {
        kg: Number(rows[0]?.kg) || 0,
        refuelCount: Number(rows[0]?.refuel_count) || 0,
        vehicleCount: Number(rows[0]?.vehicle_count) || 0,
        stationCount: Number(rows[0]?.station_count) || 0,
      };
    }
    const ranked = rankHydrogenStations(nearby, metric);
    return c.json({
      center,
      radiusKm,
      kg: nearbySummary.kg,
      refuelCount: nearbySummary.refuelCount,
      vehicleCount: nearbySummary.vehicleCount,
      stationCount: nearbySummary.stationCount,
      topStations: ranked.slice(0, 10).map((row) => serializeHydrogenStation(row, metric)),
    });
  });
}

/** 生产用路由器：绑定真实连接池。 */
export function createHydrogenHeatmapRouter(): Hono {
  const app = new Hono();
  registerHydrogenHeatmapRoutes(app, { mysql: mysqlPool });
  return app;
}

const app = createHydrogenHeatmapRouter();
export default app;