import { describe, expect, it } from "vitest";
import {
  addDaysIso,
  businessTodayIso,
  dashboardRangeParams,
  mondayOf,
  monthEndIso,
  monthStartIso,
} from "@/domain/dashboard/utils/dashboard-range-utils";

describe("businessTodayIso", () => {
  it("formats the America/New_York calendar date regardless of UTC time", () => {
    expect(businessTodayIso(new Date("2026-09-16T23:30:00Z"))).toBe("2026-09-16");
    expect(businessTodayIso(new Date("2026-09-17T02:30:00Z"))).toBe("2026-09-16");
    expect(businessTodayIso(new Date("2026-01-01T04:30:00Z"))).toBe("2025-12-31");
  });
});

describe("addDaysIso", () => {
  it("rolls over month and year boundaries", () => {
    expect(addDaysIso("2026-01-31", 1)).toBe("2026-02-01");
    expect(addDaysIso("2026-12-31", 1)).toBe("2027-01-01");
    expect(addDaysIso("2026-09-14", -7)).toBe("2026-09-07");
  });
});

describe("mondayOf", () => {
  it("returns the Monday of the ISO week", () => {
    expect(mondayOf("2026-09-16")).toBe("2026-09-14");
    expect(mondayOf("2026-09-14")).toBe("2026-09-14");
    expect(mondayOf("2026-09-13")).toBe("2026-09-07");
  });
});

describe("monthStartIso / monthEndIso", () => {
  it("returns month bounds", () => {
    expect(monthStartIso("2026-09-16")).toBe("2026-09-01");
    expect(monthEndIso("2026-09-16")).toBe("2026-09-30");
    expect(monthEndIso("2026-02-16")).toBe("2026-02-28");
  });
});

describe("dashboardRangeParams", () => {
  it("maps today to the business date", () => {
    expect(dashboardRangeParams("today", "2026-09-16")).toEqual({
      dateFrom: "2026-09-16",
      dateTo: "2026-09-16",
    });
  });

  it("maps this week to the Monday-Friday business week", () => {
    expect(dashboardRangeParams("this-week", "2026-09-16")).toEqual({
      dateFrom: "2026-09-14",
      dateTo: "2026-09-18",
    });
  });

  it("maps last 3 months to the trailing month span", () => {
    expect(dashboardRangeParams("last-3-months", "2026-09-16")).toEqual({
      dateFrom: "2026-07-01",
      dateTo: "2026-09-30",
    });
  });

  it("maps all time to unbounded params", () => {
    expect(dashboardRangeParams("all-time", "2026-09-16")).toEqual({});
  });
});