const Fastify = require("fastify");

const { AppError } = require("../../../src/utils/AppError");
const leaveRoutes = require("../../../src/routes/leave");

function buildFlagRecord(overrides = {}) {
  return {
    id: "flag-1",
    flag_key: "leave_holiday_calendar",
    override_mode: "force_on",
    rollout_type: "global",
    department_ids: [],
    note: "",
    version: 1,
    created_at: new Date("2026-04-01T00:00:00.000Z"),
    created_by: null,
    updated_at: new Date("2026-04-01T00:00:00.000Z"),
    updated_by: null,
    ...overrides,
  };
}

function buildCalendarDay(date, dayType) {
  return {
    date: new Date(`${date}T00:00:00.000Z`),
    day_type: dayType,
  };
}

function buildLegalEntity(overrides = {}) {
  return {
    id: "legal-entity-1",
    default_holiday_calendar: {
      id: "calendar-1",
      archived_at: null,
      days: [
        buildCalendarDay("2026-01-01", "holiday"),
        buildCalendarDay("2026-01-02", "holiday"),
        buildCalendarDay("2026-01-03", "holiday"),
        buildCalendarDay("2026-01-04", "adjusted_workday"),
      ],
    },
    ...overrides,
  };
}

async function buildApp(options = {}) {
  const app = Fastify();
  const employee = options.employee ?? {
    id: "employee-1",
    department_id: "department-1",
    legal_entity_id: "legal-entity-1",
    permissionCodes: [],
  };

  const featureFlagFindUnique = vi
    .fn()
    .mockResolvedValue(options.featureFlagRecord ?? buildFlagRecord());
  const legalEntityFindUnique = vi
    .fn()
    .mockResolvedValue(options.legalEntity ?? buildLegalEntity());

  app.decorate("prisma", {
    featureFlag: {
      findUnique: featureFlagFindUnique,
    },
    legalEntity: {
      findUnique: legalEntityFindUnique,
    },
  });
  app.decorate("config", {
    cutoverConsoleEnabled: false,
    leaveHolidayCalendarEnabled:
      options.leaveHolidayCalendarEnabled === undefined
        ? true
        : options.leaveHolidayCalendarEnabled,
  });
  app.decorate("authenticate", async (request) => {
    if (!request.headers.authorization) {
      throw new AppError({
        code: "AUTH_001",
        message: "未登录",
        statusCode: 401,
      });
    }

    request.employee = employee;
  });
  app.decorate("hasPermission", () => false);
  app.decorate("requireEntityPermission", () => async (request) => {
    await app.authenticate(request);
  });

  app.setErrorHandler((error, request, reply) => {
    if (error instanceof AppError) {
      return reply.status(error.statusCode).send({
        requestId: request.id,
        error: {
          code: error.code,
          message: error.message,
          details: error.details ?? {},
        },
      });
    }

    return reply.status(500).send({
      requestId: request.id,
      error: { code: "SYS_001", message: "服务器内部错误", details: {} },
    });
  });

  await app.register(leaveRoutes, { prefix: "/api" });

  return {
    app,
    featureFlagFindUnique,
    legalEntityFindUnique,
  };
}

describe("leave working-days route", () => {
  it("returns preview fields and counts for ranges that include official holidays", async () => {
    const { app } = await buildApp();

    const response = await app.inject({
      method: "GET",
      url: "/api/leave-requests/working-days?startDate=2026-01-01&endDate=2026-01-04&startSession=am&endSession=pm",
      headers: { authorization: "Bearer test" },
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().data).toEqual({
      requestedDays: 1,
      naturalRequestedDays: 4,
      holidayDayCount: 3,
      weekendDayCount: 0,
      adjustedWorkdayCount: 1,
      calendarApplied: true,
      isNonWorkingRange: false,
    });

    await app.close();
  });

  it("keeps half-day precision in preview results", async () => {
    const { app } = await buildApp();

    const response = await app.inject({
      method: "GET",
      url: "/api/leave-requests/working-days?startDate=2026-01-03&endDate=2026-01-04&startSession=pm&endSession=am",
      headers: { authorization: "Bearer test" },
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().data).toEqual({
      requestedDays: 0.5,
      naturalRequestedDays: 1,
      holidayDayCount: 0.5,
      weekendDayCount: 0,
      adjustedWorkdayCount: 0.5,
      calendarApplied: true,
      isNonWorkingRange: false,
    });

    await app.close();
  });

  it("returns zero days instead of error for fully non-working preview ranges", async () => {
    const { app } = await buildApp({
      legalEntity: buildLegalEntity({
        default_holiday_calendar: {
          id: "calendar-1",
          archived_at: null,
          days: [
            buildCalendarDay("2026-05-01", "holiday"),
            buildCalendarDay("2026-05-02", "holiday"),
            buildCalendarDay("2026-05-03", "holiday"),
            buildCalendarDay("2026-05-04", "holiday"),
            buildCalendarDay("2026-05-05", "holiday"),
          ],
        },
      }),
    });

    const response = await app.inject({
      method: "GET",
      url: "/api/leave-requests/working-days?startDate=2026-05-01&endDate=2026-05-05&startSession=am&endSession=pm",
      headers: { authorization: "Bearer test" },
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().data).toEqual({
      requestedDays: 0,
      naturalRequestedDays: 5,
      holidayDayCount: 5,
      weekendDayCount: 0,
      adjustedWorkdayCount: 0,
      calendarApplied: true,
      isNonWorkingRange: true,
    });

    await app.close();
  });

  it("falls back to natural days when the holiday-calendar feature is disabled", async () => {
    const { app, featureFlagFindUnique, legalEntityFindUnique } = await buildApp({
      leaveHolidayCalendarEnabled: false,
    });

    const response = await app.inject({
      method: "GET",
      url: "/api/leave-requests/working-days?startDate=2026-01-01&endDate=2026-01-04&startSession=am&endSession=pm",
      headers: { authorization: "Bearer test" },
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().data).toEqual({
      requestedDays: 4,
      naturalRequestedDays: 4,
      holidayDayCount: 0,
      weekendDayCount: 0,
      adjustedWorkdayCount: 0,
      calendarApplied: false,
      isNonWorkingRange: false,
    });
    expect(featureFlagFindUnique).not.toHaveBeenCalled();
    expect(legalEntityFindUnique).not.toHaveBeenCalled();

    await app.close();
  });
});