import { copyArrayWith } from "../../src/utils/array-utils";
import { describe, it, expect } from "vitest";

describe("copyArrayWith", () => {
    it("should replace the element at the specified index", () => {
        const original = [1, 2, 3, 4];
        const result = copyArrayWith(2, 99, original);
        expect(result).toEqual([1, 2, 99, 4]);
    });

    it("should not modify the original array", () => {
        const original = ["a", "b", "c"];
        const result = copyArrayWith(1, "x", original);
        expect(original).toEqual(["a", "b", "c"]); // Original remains unchanged
        expect(result).toEqual(["a", "x", "c"]);
    });

    it("should handle replacing the first element", () => {
        const original = [true, false, true];
        const result = copyArrayWith(0, false, original);
        expect(result).toEqual([false, false, true]);
    });

    it("should handle replacing the last element", () => {
        const original = ["apple", "banana", "cherry"];
        const result = copyArrayWith(2, "date", original);
        expect(result).toEqual(["apple", "banana", "date"]);
    });

    it("should work with complex objects", () => {
        const original = [{ id: 1 }, { id: 2 }, { id: 3 }];
        const newValue = { id: 99 };
        const result = copyArrayWith(1, newValue, original);
        expect(result).toEqual([{ id: 1 }, { id: 99 }, { id: 3 }]);
        expect(original[1].id).toBe(2); // Original remains unchanged
    });

    it("should allow setting to undefined", () => {
        const original = [1, 2, 3];
        const result = copyArrayWith(1, undefined, original);
        expect(result).toEqual([1, undefined, 3]);
    });

    it("should allow setting to null", () => {
        const original = [1, 2, 3];
        const result = copyArrayWith(1, null, original);
        expect(result).toEqual([1, null, 3]);
    });
});