"use strict";

const expect = require("chai").expect;
const TestUtil = require("../../util");
const Utils = require("../../../src/command-line/utils");

describe("Utils", function() {
	describe(".extraHelp", function() {
		let originalRaw;

		beforeEach(function() {
			originalRaw = log.raw;
		});

		afterEach(function() {
			log.raw = originalRaw;
		});

		it("should start and end with empty lines to display correctly with --help", function() {
			// Mock `log.raw` to extract its effect into an array
			const stdout = [];
			log.raw = TestUtil.mockLogger((str) => stdout.push(str));

			Utils.extraHelp();

			// Starts with 2 empty lines
			expect(stdout[0]).to.equal("\n");
			expect(stdout[1]).to.equal("\n");
			expect(stdout[2]).to.not.equal("\n");

			// Ends with 1 empty line
			expect(stdout[stdout.length - 2]).to.not.equal("\n");
			expect(stdout[stdout.length - 1]).to.equal("\n");
		});

		it("should contain information about THELOUNGE_HOME env var", function() {
			// Mock `log.raw` to extract its effect into a concatenated string
			let stdout = "";
			log.raw = TestUtil.mockLogger((str) => stdout += str);

			Utils.extraHelp();

			expect(stdout).to.include("THELOUNGE_HOME");
		});
	});

	describe(".parseConfigOptions", function() {
		describe("when it's the first option given", function() {
			it("should return nothing when passed an invalid config", function() {
				expect(Utils.parseConfigOptions("foo")).to.be.undefined;
			});

			it("should correctly parse boolean values", function() {
				expect(Utils.parseConfigOptions("foo=true")).to.deep.equal({foo: true});
				expect(Utils.parseConfigOptions("foo=false")).to.deep.equal({foo: false});
			});

			it("should correctly parse empty strings", function() {
				expect(Utils.parseConfigOptions("foo=")).to.deep.equal({foo: ""});
			});

			it("should correctly parse null values", function() {
				expect(Utils.parseConfigOptions("foo=null")).to.deep.equal({foo: null});
			});

			it("should correctly parse undefined values", function() {
				expect(Utils.parseConfigOptions("foo=undefined"))
					.to.deep.equal({foo: undefined});
			});

			it("should correctly parse array values", function() {
				expect(Utils.parseConfigOptions("foo=[bar,true]"))
					.to.deep.equal({foo: ["bar", true]});

				expect(Utils.parseConfigOptions("foo=[bar, true]"))
					.to.deep.equal({foo: ["bar", true]});
			});

			it("should correctly parse empty array values", function() {
				expect(Utils.parseConfigOptions("foo=[]"))
					.to.deep.equal({foo: []});
			});

			it("should correctly parse values that contain `=` sign", function() {
				expect(Utils.parseConfigOptions("foo=bar=42"))
					.to.deep.equal({foo: "bar=42"});
			});

			it("should correctly parse keys using dot-notation", function() {
				expect(Utils.parseConfigOptions("foo.bar=value"))
					.to.deep.equal({foo: {bar: "value"}});
			});

			it("should correctly parse keys using array-notation", function() {
				expect(Utils.parseConfigOptions("foo[0]=value"))
					.to.deep.equal({foo: ["value"]});
			});
		});

		describe("when some options have already been parsed", function() {
			it("should not modify existing options when passed an invalid config", function() {
				const memo = {foo: "bar"};
				expect(Utils.parseConfigOptions("foo", memo)).to.equal(memo);
			});

			it("should combine a new option with previously parsed ones", function() {
				expect(Utils.parseConfigOptions("bar=false", {foo: true}))
					.to.deep.equal({foo: true, bar: false});
			});

			it("should maintain existing properties of a nested object", function() {
				expect(Utils.parseConfigOptions("foo.bar=true", {foo: {baz: false}}))
					.to.deep.equal({foo: {bar: true, baz: false}});
			});

			it("should maintain existing entries of an array", function() {
				expect(Utils.parseConfigOptions("foo[1]=baz", {foo: ["bar"]}))
					.to.deep.equal({foo: ["bar", "baz"]});
			});

			describe("when given the same key multiple times", function() {
				let originalWarn;

				beforeEach(function() {
					originalWarn = log.warn;
				});

				afterEach(function() {
					log.warn = originalWarn;
				});

				it("should not override options", function() {
					log.warn = () => {};

					expect(Utils.parseConfigOptions("foo=baz", {foo: "bar"}))
						.to.deep.equal({foo: "bar"});
				});

				it("should display a warning", function() {
					let warning = "";
					log.warn = TestUtil.mockLogger((str) => warning += str);

					Utils.parseConfigOptions("foo=bar", {foo: "baz"});

					expect(warning).to.include("foo was already specified");
				});
			});
		});
	});
});