import type { IncomingMessage, ServerResponse } from "node:http";
import type { Plugin } from "vite";

const station = {
  id: "101",
  name: "本地验收加氢站",
  province: "浙江省",
  city: "嘉兴市",
  kg: 12345.67,
  lingniuKg: 10000,
  externalKg: 2345.67,
  cost: 23456.78,
  revenue: 34567.89,
  customerRevenue: 34567.89,
  customerCost: 18000,
  companyCost: 4000,
  otherCost: 1456.78,
  recordCount: 42,
  customerCount: 1,
  share: 100,
};

const customer = {
  id: 1,
  name: "本地验收客户",
  kg: 12345.67,
  customerBearingKg: 10000,
  companyBearingKg: 2000,
  otherBearingKg: 345.67,
  bearer: "both",
  cost: 23456.78,
  revenue: 34567.89,
  customerRevenue: 34567.89,
  customerCost: 18000,
  companyCost: 4000,
  otherCost: 1456.78,
  recordCount: 42,
};

const range = { startDate: "2026-01-01", endDate: "2026-08-31" };
const watermark = { ledgerAt: "2026-08-31 16:00:00", paymentAt: null };
const kpis = {
  totalKg: 12345.67,
  totalCost: 23456.78,
  customerBearingKg: 10000,
  companyBearingKg: 2000,
  otherBearingKg: 345.67,
  customerRevenue: 34567.89,
  customerCost: 18000,
  companyCost: 4000,
  otherCost: 1456.78,
  totalRevenue: 34567.89,
  customerGrossProfit: 16567.89,
  monthKg: 3456.78,
  monthCost: 6789.01,
  todayKg: 123.45,
  todayCost: 234.56,
  monthShareOfRange: 28,
  todayShareOfMonth: 3.57,
  recordCount: 42,
  stationCount: 1,
};

const overview = {
  range,
  watermark,
  filters: {},
  kpis,
  monthly: [{
    month: "2026-08",
    totalKg: 12345.67,
    lingniuKg: 10000,
    externalKg: 2345.67,
    cost: 23456.78,
    customerCost: 18000,
    companyCost: 4000,
    otherCost: 1456.78,
    revenue: 34567.89,
    customerRevenue: 34567.89,
    customerGrossProfit: 16567.89,
  }],
  topStations: [station],
  regions: [{ region: "嘉兴市", kg: 12345.67, share: 100 }],
  stations: [station],
  customers: [customer],
};

const dailyPoint = {
  date: "2026-08-31",
  kg: 123.45,
  lingniuKg: 100,
  externalKg: 23.45,
  cost: 234.56,
  recordCount: 2,
  stationCount: 1,
};

export function devMockResponse(pathname: string) {
  if (pathname === "/api/health") return { status: "ok", source: "dev-mock" };
  if (pathname.endsWith("/meta")) return {
    years: [{ value: 2026, startDate: range.startDate, endDate: range.endDate }],
    stations: [{ id: station.id, name: station.name }],
    watermark,
  };
  if (pathname.endsWith("/overview")) return overview;
  if (pathname.endsWith("/daily-tree")) return {
    date: dailyPoint.date,
    stations: [{
      id: station.id,
      name: station.name,
      kg: dailyPoint.kg,
      cost: dailyPoint.cost,
      recordCount: 2,
      customers: [{ id: customer.id, name: customer.name, kg: dailyPoint.kg, cost: dailyPoint.cost, recordCount: 2 }],
    }],
  };
  if (pathname.endsWith("/daily")) return {
    range,
    watermark,
    filters: {},
    kpis: { totalKg: 12345.67, totalCost: 23456.78, averageDailyKg: 823.04, stationCount: 1, activeDays: 15 },
    trend: [dailyPoint],
    days: [dailyPoint],
  };
  if (pathname.endsWith("/drill")) return {
    groupBy: "record",
    amountScope: "all",
    filters: {},
    summary: { recordCount: 1, kg: 123.45, cost: 4000, revenue: 4320 },
    groups: [{ ...station, stationCount: 1, customerCount: 1 }],
    records: [{
      id: 1,
      time: "2026-08-31 12:00:00",
      orderNo: "DEV-001",
      stationId: station.id,
      stationName: station.name,
      customerId: customer.id,
      customerName: customer.name,
      plateNo: "浙FDEV01",
      source: "dev-mock",
      verifyStatus: "verified",
      vehicleId: 1,
      kg: 123.45,
      unitPrice: 35,
      cost: 4000,
      revenue: 4320,
    }],
    page: { page: 1, pageSize: 100, hasMore: false },
  };
  return undefined;
}

function sendJson(response: ServerResponse, body: unknown) {
  response.statusCode = 200;
  response.setHeader("Content-Type", "application/json; charset=utf-8");
  response.end(JSON.stringify(body));
}

export function energyDevMockApi(): Plugin {
  return {
    name: "energy-dev-mock-api",
    configureServer(server) {
      server.middlewares.use((request: IncomingMessage, response: ServerResponse, next) => {
        const pathname = new URL(request.url ?? "/", "http://localhost").pathname;
        if (pathname === "/favicon.ico") {
          response.statusCode = 204;
          return response.end();
        }
        const body = devMockResponse(pathname);
        if (body === undefined) return next();
        sendJson(response, body);
      });
    },
  };
}