const assert = require("node:assert");

const { runTests } = require("../runner.js");
const { eq, keys } = require("../../src/utils.js");

const test_eq = t => {
	t.start("eq()");
	t.test("scalar values equality", () => {
		assert(eq(0, 0));
		assert(eq(100, 100));
		assert(eq(1.5, 1.5));
		assert(eq(-9, -9));

		assert(!eq(0, 1));
		assert(!eq(100, 99));
		assert(!eq(1.5, 1.4));
		assert(!eq(-9, 9));


		assert(eq(null, null));
		assert(eq(undefined, undefined));
		assert(eq("", ""));
		assert(eq("a string", "a string"));

		assert(!eq(null, undefined));
		assert(!eq(undefined, 0));
		assert(!eq("", "0"));
		assert(!eq("a string", "another string"));


		assert(eq(true, true));
		assert(eq(false, false));

		assert(!eq(true, false));


		assert(eq(1n, 1n));
		assert(eq(99999999999999n, 99999999999999n));
	});

	t.test("array equality", () => {
		assert(eq([], []));


		assert(eq([0, 1, 2], [0, 1, 2]));
		assert(eq([0, 1, 2], new Array(0, 1, 2)));

		assert(!eq([0, 1, 2], [0, 1]));
		assert(!eq([0, 1], new Array(0, 1, 2)));


		assert(eq([undefined], [undefined]));
		assert(eq([null, 0, "", true], [null, 0, "", true]));


		assert(eq([[[[0]]]], [[[[0]]]]));

		assert(!eq([[[[0]]]], [0]));
	});

	t.test("object equality", () => {
		assert(eq({}, {}));
		assert(eq({ a: 1 }, { a: 1 }));

		assert(!eq({ a: 1, b: undefined }, { a: 1 }));


		assert(eq(
			{ a: 1, b: { c: { d: "e" } } },
			{ a: 1, b: { c: { d: "e" } } },
		));

		class C {}
		// ... FIXME: finish
	});

	t.test("mixed values", () => {
		assert(eq(
			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
		));

		assert(!eq(null, {}));

		assert(!eq([], {}));
	});
};

const test_keys = t => {
	t.start("keys()");
	t.test("happy paths", () => {
		assert.deepEqual(
			{ a: 1, b: 2 },
			keys(["a", "b"], { a: 1, b: 2, c: 3 }),
		);
	});

	t.test("stress scenarios", () => {
		assert.deepEqual(
			{},
			keys([], {}),
			"empty selection of empty object",
		);

		assert.deepEqual(
			{},
			keys([], {a: 1}),
			"empty selection of non-empty object",
		);

		assert.deepEqual(
			{},
			keys(["a"], {}),
			"non-empty selection of empty object",
		);

		assert.deepEqual(
			{ a: undefined, b: null },
			keys(["a", "b", "c"], { a: undefined, b: null }),
			"falsy values",
		);
	});
};

const tests = [
	test_eq,
	test_keys,
];

runTests(tests);