"use strict";

require("./helpers/warmup-webpack");

const path = require("path");
const fs = require("graceful-fs");
const vm = require("vm");
const rimraf = require("rimraf");
const checkArrayExpectation = require("./checkArrayExpectation");
const createLazyTestEnv = require("./helpers/createLazyTestEnv");
const { remove } = require("./helpers/remove");
const prepareOptions = require("./helpers/prepareOptions");
const deprecationTracking = require("./helpers/deprecationTracking");
const FakeDocument = require("./helpers/FakeDocument");

function copyDiff(src, dest, initial) {
	if (!fs.existsSync(dest)) fs.mkdirSync(dest);
	const files = fs.readdirSync(src);
	files.forEach(filename => {
		const srcFile = path.join(src, filename);
		const destFile = path.join(dest, filename);
		const directory = fs.statSync(srcFile).isDirectory();
		if (directory) {
			copyDiff(srcFile, destFile, initial);
		} else {
			var content = fs.readFileSync(srcFile);
			if (/^DELETE\s*$/.test(content.toString("utf-8"))) {
				fs.unlinkSync(destFile);
			} else if (/^DELETE_DIRECTORY\s*$/.test(content.toString("utf-8"))) {
				rimraf.sync(destFile);
			} else {
				fs.writeFileSync(destFile, content);
				if (initial) {
					const longTimeAgo = Date.now() - 1000 * 60 * 60 * 24;
					fs.utimesSync(
						destFile,
						Date.now() - longTimeAgo,
						Date.now() - longTimeAgo
					);
				}
			}
		}
	});
}

const describeCases = config => {
	describe(config.name, () => {
		if (process.env.NO_WATCH_TESTS) {
			it.skip("long running tests excluded", () => {});
			return;
		}

		const casesPath = path.join(__dirname, "watchCases");
		let categories = fs.readdirSync(casesPath);

		categories = categories.map(cat => {
			return {
				name: cat,
				tests: fs
					.readdirSync(path.join(casesPath, cat))
					.filter(folder => folder.indexOf("_") < 0)
					.filter(testName => {
						const testDirectory = path.join(casesPath, cat, testName);
						const filterPath = path.join(testDirectory, "test.filter.js");
						if (fs.existsSync(filterPath) && !require(filterPath)(config)) {
							describe.skip(testName, () => it("filtered", () => {}));
							return false;
						}
						return true;
					})
					.sort()
			};
		});
		beforeAll(() => {
			let dest = path.join(__dirname, "js");
			if (!fs.existsSync(dest)) fs.mkdirSync(dest);
			dest = path.join(__dirname, "js", config.name + "-src");
			if (!fs.existsSync(dest)) fs.mkdirSync(dest);
		});
		categories.forEach(category => {
			beforeAll(() => {
				const dest = path.join(
					__dirname,
					"js",
					config.name + "-src",
					category.name
				);
				if (!fs.existsSync(dest)) fs.mkdirSync(dest);
			});
			describe(category.name, () => {
				category.tests.forEach(testName => {
					describe(testName, () => {
						const tempDirectory = path.join(
							__dirname,
							"js",
							config.name + "-src",
							category.name,
							testName
						);
						const testDirectory = path.join(casesPath, category.name, testName);
						const runs = fs
							.readdirSync(testDirectory)
							.sort()
							.filter(name => {
								return fs
									.statSync(path.join(testDirectory, name))
									.isDirectory();
							})
							.map(name => ({ name }));

						beforeAll(done => {
							rimraf(tempDirectory, done);
						});

						it(
							testName + " should compile",
							done => {
								const outputDirectory = path.join(
									__dirname,
									"js",
									config.name,
									category.name,
									testName
								);

								rimraf.sync(outputDirectory);

								let options = {};
								const configPath = path.join(
									testDirectory,
									"webpack.config.js"
								);
								if (fs.existsSync(configPath)) {
									options = prepareOptions(require(configPath), {
										testPath: outputDirectory,
										srcPath: tempDirectory
									});
								}
								const applyConfig = (options, idx) => {
									if (!options.mode) options.mode = "development";
									if (!options.context) options.context = tempDirectory;
									if (!options.entry) options.entry = "./index.js";
									if (!options.target) options.target = "async-node";
									if (!options.output) options.output = {};
									if (!options.output.path)
										options.output.path = outputDirectory;
									if (typeof options.output.pathinfo === "undefined")
										options.output.pathinfo = true;
									if (!options.output.filename)
										options.output.filename = "bundle.js";
									if (options.cache && options.cache.type === "filesystem") {
										const cacheDirectory = path.join(tempDirectory, ".cache");
										options.cache.cacheDirectory = cacheDirectory;
										options.cache.name = `config-${idx}`;
									}
									if (config.experiments) {
										if (!options.experiments) options.experiments = {};
										for (const key of Object.keys(config.experiments)) {
											if (options.experiments[key] === undefined)
												options.experiments[key] = config.experiments[key];
										}
									}
									if (config.optimization) {
										if (!options.optimization) options.optimization = {};
										for (const key of Object.keys(config.optimization)) {
											if (options.optimization[key] === undefined)
												options.optimization[key] = config.optimization[key];
										}
									}
								};
								if (Array.isArray(options)) {
									options.forEach(applyConfig);
								} else {
									applyConfig(options, 0);
								}

								const state = {};
								let runIdx = 0;
								let waitMode = false;
								let run = runs[runIdx];
								let triggeringFilename;
								let lastHash = "";
								const currentWatchStepModule = require("./helpers/currentWatchStep");
								let compilationFinished = done;
								currentWatchStepModule.step = run.name;
								copyDiff(
									path.join(testDirectory, run.name),
									tempDirectory,
									true
								);

								setTimeout(() => {
									const deprecationTracker = deprecationTracking.start();
									const webpack = require("..");
									const compiler = webpack(options);
									compiler.hooks.invalid.tap(
										"WatchTestCasesTest",
										(filename, mtime) => {
											triggeringFilename = filename;
										}
									);
									compiler.watch(
										{
											aggregateTimeout: 1000
										},
										(err, stats) => {
											if (err) return compilationFinished(err);
											if (!stats) {
												return compilationFinished(
													new Error("No stats reported from Compiler")
												);
											}
											if (stats.hash === lastHash) return;
											lastHash = stats.hash;
											if (run.done && lastHash !== stats.hash) {
												return compilationFinished(
													new Error(
														"Compilation changed but no change was issued " +
															lastHash +
															" != " +
															stats.hash +
															" (run " +
															runIdx +
															")\n" +
															"Triggering change: " +
															triggeringFilename
													)
												);
											}
											if (waitMode) return;
											run.done = true;
											run.stats = stats;
											if (err) return compilationFinished(err);
											const statOptions = {
												preset: "verbose",
												cached: true,
												cachedAssets: true,
												cachedModules: true,
												colors: false
											};
											fs.mkdirSync(outputDirectory, { recursive: true });
											fs.writeFileSync(
												path.join(
													outputDirectory,
													`stats.${runs[runIdx] && runs[runIdx].name}.txt`
												),
												stats.toString(statOptions),
												"utf-8"
											);
											const jsonStats = stats.toJson({
												errorDetails: true
											});
											if (
												checkArrayExpectation(
													path.join(testDirectory, run.name),
													jsonStats,
													"error",
													"Error",
													compilationFinished
												)
											)
												return;
											if (
												checkArrayExpectation(
													path.join(testDirectory, run.name),
													jsonStats,
													"warning",
													"Warning",
													compilationFinished
												)
											)
												return;

											const globalContext = {
												console: console,
												expect: expect,
												setTimeout,
												clearTimeout,
												document: new FakeDocument()
											};

											function _require(currentDirectory, module) {
												if (Array.isArray(module) || /^\.\.?\//.test(module)) {
													let fn;
													let content;
													let p;
													if (Array.isArray(module)) {
														p = path.join(currentDirectory, module[0]);
														content = module
															.map(arg => {
																p = path.join(currentDirectory, arg);
																return fs.readFileSync(p, "utf-8");
															})
															.join("\n");
													} else {
														p = path.join(currentDirectory, module);
														content = fs.readFileSync(p, "utf-8");
													}
													if (
														options.target === "web" ||
														options.target === "webworker"
													) {
														fn = vm.runInNewContext(
															"(function(require, module, exports, __dirname, __filename, it, WATCH_STEP, STATS_JSON, STATE, expect, window, self) {" +
																'function nsObj(m) { Object.defineProperty(m, Symbol.toStringTag, { value: "Module" }); return m; }' +
																content +
																"\n})",
															globalContext,
															p
														);
													} else {
														fn = vm.runInThisContext(
															"(function(require, module, exports, __dirname, __filename, it, WATCH_STEP, STATS_JSON, STATE, expect) {" +
																"global.expect = expect;" +
																'function nsObj(m) { Object.defineProperty(m, Symbol.toStringTag, { value: "Module" }); return m; }' +
																content +
																"\n})",
															p
														);
													}
													const m = {
														exports: {}
													};
													fn.call(
														m.exports,
														_require.bind(null, path.dirname(p)),
														m,
														m.exports,
														path.dirname(p),
														p,
														run.it,
														run.name,
														jsonStats,
														state,
														expect,
														globalContext,
														globalContext
													);
													return module.exports;
												} else if (
													testConfig.modules &&
													module in testConfig.modules
												) {
													return testConfig.modules[module];
												} else return jest.requireActual(module);
											}

											let testConfig = {};
											try {
												// try to load a test file
												testConfig = require(path.join(
													testDirectory,
													"test.config.js"
												));
											} catch (e) {
												// empty
											}

											if (testConfig.noTests)
												return process.nextTick(compilationFinished);
											_require(
												outputDirectory,
												testConfig.bundlePath || "./bundle.js"
											);

											if (run.getNumberOfTests() < 1)
												return compilationFinished(
													new Error("No tests exported by test case")
												);

											run.it(
												"should compile the next step",
												done => {
													runIdx++;
													if (runIdx < runs.length) {
														run = runs[runIdx];
														waitMode = true;
														setTimeout(() => {
															waitMode = false;
															compilationFinished = done;
															currentWatchStepModule.step = run.name;
															copyDiff(
																path.join(testDirectory, run.name),
																tempDirectory,
																false
															);
														}, 1500);
													} else {
														const deprecations = deprecationTracker();
														if (
															checkArrayExpectation(
																testDirectory,
																{ deprecations },
																"deprecation",
																"Deprecation",
																done
															)
														) {
															compiler.close();
															return;
														}
														compiler.close(done);
													}
												},
												45000
											);

											compilationFinished();
										}
									);
								}, 300);
							},
							45000
						);

						for (const run of runs) {
							const { it: _it, getNumberOfTests } = createLazyTestEnv(
								10000,
								run.name
							);
							run.it = _it;
							run.getNumberOfTests = getNumberOfTests;
							it(`${run.name} should allow to read stats`, done => {
								if (run.stats) {
									run.stats.toString({ all: true });
									run.stats = undefined;
								}
								done();
							});
						}

						afterAll(() => {
							remove(tempDirectory);
						});
					});
				});
			});
		});
	});
};
exports.describeCases = describeCases;
