import { describe, expect, it } from "vitest";

import { BookerLayouts } from "@calcom/prisma/zod-utils";

import { getPrefetchMonthCount } from "./getPrefetchMonthCount";

describe("getPrefetchMonthCount", () => {
  describe("COLUMN_VIEW layout", () => {
    it("should return 2 when months are different", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", 1, 2, false);
      expect(result).toBe(2);
    });

    it("should return undefined when months are the same", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", 5, 5, false);
      expect(result).toBe(undefined);
    });

    it("should return 2 regardless of bookerState when months are different", () => {
      expect(getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_time", 3, 4, false)).toBe(2);
      expect(getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "booking", 7, 8, false)).toBe(2);
    });

    it("should return 2 even when prefetchNextMonth is true", () => {
      expect(getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_time", 3, 4, true)).toBe(2);
    });
  });

  describe("WEEK_VIEW layout", () => {
    it("should return undefined when state is selecting_time", () => {
      const result = getPrefetchMonthCount(BookerLayouts.WEEK_VIEW, "selecting_time", 1, 2, false);
      expect(result).toBe(undefined);
    });

    it("should return undefined when state is not selecting_time", () => {
      const result = getPrefetchMonthCount(BookerLayouts.WEEK_VIEW, "selecting_date", 1, 2, false);
      expect(result).toBe(undefined);
    });

    it("should return undefined even with different months", () => {
      const result = getPrefetchMonthCount(BookerLayouts.WEEK_VIEW, "booking", 0, 11, false);
      expect(result).toBe(undefined);
    });
  });

  describe("MONTH_VIEW layout with selecting_time state", () => {
    it("should return 2 when months are different and NOT prefetching", () => {
      const result = getPrefetchMonthCount(BookerLayouts.MONTH_VIEW, "selecting_time", 3, 4, false);
      expect(result).toBe(2);
    });

    it("should return undefined when months are different but ALREADY prefetching", () => {
      const result = getPrefetchMonthCount(BookerLayouts.MONTH_VIEW, "selecting_time", 3, 4, true);
      expect(result).toBe(undefined);
    });

    it("should return undefined when months are the same", () => {
      const result = getPrefetchMonthCount(BookerLayouts.MONTH_VIEW, "selecting_time", 6, 6, false);
      expect(result).toBe(undefined);
    });
  });

  describe("MONTH_VIEW layout with other states", () => {
    it("should return undefined when state is selecting_date", () => {
      const result = getPrefetchMonthCount(BookerLayouts.MONTH_VIEW, "selecting_date", 1, 2, false);
      expect(result).toBe(undefined);
    });

    it("should return undefined when state is booking", () => {
      const result = getPrefetchMonthCount(BookerLayouts.MONTH_VIEW, "booking", 1, 2, false);
      expect(result).toBe(undefined);
    });
  });

  describe("invalid month inputs", () => {
    it("should return undefined when first month is NaN", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", NaN, 5, false);
      expect(result).toBe(undefined);
    });

    it("should return undefined when second month is NaN", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", 5, NaN, false);
      expect(result).toBe(undefined);
    });

    it("should return undefined when both months are invalid", () => {
      const result = getPrefetchMonthCount(
        BookerLayouts.COLUMN_VIEW,
        "selecting_time",
        Infinity,
        -Infinity,
        false
      );
      expect(result).toBe(undefined);
    });
  });

  describe("edge cases", () => {
    it("should handle month transitions (11 to 0)", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", 11, 0, false);
      expect(result).toBe(2);
    });

    it("should handle negative month numbers if they are different", () => {
      const result = getPrefetchMonthCount(BookerLayouts.COLUMN_VIEW, "selecting_date", -1, 5, false);
      expect(result).toBe(2);
    });
  });
});