const {
  calculateRequestedDays,
  leaveRangesOverlap,
  summarizeLeaveLedgerEntries,
} = require("../../../src/services/leave");

describe("Leave Service", () => {
  describe("calculateRequestedDays", () => {
    it("supports same-day half-day requests", () => {
      expect(
        calculateRequestedDays({
          startDate: "2026-03-10",
          endDate: "2026-03-10",
          startSession: "am",
          endSession: "am",
        }),
      ).toBe(0.5);

      expect(
        calculateRequestedDays({
          startDate: "2026-03-10",
          endDate: "2026-03-10",
          startSession: "pm",
          endSession: "pm",
        }),
      ).toBe(0.5);
    });

    it("supports cross-day half-day boundaries", () => {
      expect(
        calculateRequestedDays({
          startDate: "2026-03-10",
          endDate: "2026-03-12",
          startSession: "pm",
          endSession: "am",
        }),
      ).toBe(2);
    });

    it("rejects invalid session ranges", () => {
      expect(() =>
        calculateRequestedDays({
          startDate: "2026-03-10",
          endDate: "2026-03-10",
          startSession: "pm",
          endSession: "am",
        }),
      ).toThrow(/参数校验失败/);
    });
  });

  describe("leaveRangesOverlap", () => {
    it("detects overlapping half-day ranges", () => {
      expect(
        leaveRangesOverlap(
          {
            startDate: "2026-03-10",
            endDate: "2026-03-11",
            startSession: "pm",
            endSession: "pm",
          },
          {
            startDate: "2026-03-11",
            endDate: "2026-03-12",
            startSession: "am",
            endSession: "am",
          },
        ),
      ).toBe(true);
    });

    it("does not flag non-overlapping adjacent ranges", () => {
      expect(
        leaveRangesOverlap(
          {
            startDate: "2026-03-10",
            endDate: "2026-03-10",
            startSession: "am",
            endSession: "am",
          },
          {
            startDate: "2026-03-10",
            endDate: "2026-03-10",
            startSession: "pm",
            endSession: "pm",
          },
        ),
      ).toBe(false);
    });
  });

  describe("summarizeLeaveLedgerEntries", () => {
    it("calculates reserve / consume / release balances correctly", () => {
      const summary = summarizeLeaveLedgerEntries([
        { entry_type: "grant", days: 10 },
        { entry_type: "reserve", days: 2.5 },
        { entry_type: "release", days: 1 },
        { entry_type: "consume", days: 1.5 },
      ]);

      expect(summary.granted).toBe(10);
      expect(summary.reserved).toBe(1.5);
      expect(summary.used).toBe(1.5);
      expect(summary.available).toBe(7);
    });
  });
});