import { describe, expect, it } from "vitest";
import {
  buildTimelineBatchShiftAuditChanges,
  shiftTimelineAllocationWindow,
} from "../router/timeline-allocation-batch-shift-support.js";

describe("timeline allocation batch shift support", () => {
  it("shifts and clamps allocation windows for each batch-shift mode", () => {
    expect(
      shiftTimelineAllocationWindow({
        startDate: new Date("2026-04-10T00:00:00.000Z"),
        endDate: new Date("2026-04-12T00:00:00.000Z"),
        daysDelta: 2,
        mode: "move",
      }),
    ).toEqual({
      startDate: new Date("2026-04-12T00:00:00.000Z"),
      endDate: new Date("2026-04-14T00:00:00.000Z"),
    });

    expect(
      shiftTimelineAllocationWindow({
        startDate: new Date("2026-04-10T00:00:00.000Z"),
        endDate: new Date("2026-04-12T00:00:00.000Z"),
        daysDelta: 5,
        mode: "resize-start",
      }),
    ).toEqual({
      startDate: new Date("2026-04-12T00:00:00.000Z"),
      endDate: new Date("2026-04-12T00:00:00.000Z"),
    });

    expect(
      shiftTimelineAllocationWindow({
        startDate: new Date("2026-04-10T00:00:00.000Z"),
        endDate: new Date("2026-04-12T00:00:00.000Z"),
        daysDelta: -5,
        mode: "resize-end",
      }),
    ).toEqual({
      startDate: new Date("2026-04-10T00:00:00.000Z"),
      endDate: new Date("2026-04-10T00:00:00.000Z"),
    });
  });

  it("builds batch-shift audit payloads", () => {
    expect(
      buildTimelineBatchShiftAuditChanges({
        mode: "move",
        daysDelta: 3,
        count: 2,
      }),
    ).toEqual({
      operation: "batchShift",
      mode: "move",
      daysDelta: 3,
      count: 2,
    });
  });
});