import fs from 'node:fs';
import path from 'node:path';
import process from 'node:process';
import v8 from 'node:v8';

import arrify from 'arrify';
import figures from 'figures';
import yargs from 'yargs';
import {hideBin} from 'yargs/helpers';

import {asyncEventIteratorFromApi} from './api-event-iterator.js';
import Api from './api.js';
import {chalk} from './chalk.js';
import validateEnvironmentVariables from './environment-variables.js';
import normalizeExtensions from './extensions.js';
import {normalizeGlobs, normalizePattern} from './globs.js';
import isCi from './is-ci.js';
import {splitPatternAndLineNumbers} from './line-numbers.js';
import {loadConfig} from './load-config.js';
import normalizeModuleTypes from './module-types.js';
import normalizeNodeArguments from './node-arguments.js';
import pkg from './pkg.cjs';

function exit(message) {
	console.error(`\n  ${chalk.red(figures.cross)} ${message}`);
	process.exit(1); // eslint-disable-line unicorn/no-process-exit
}

const coerceLastValue = value => Array.isArray(value) ? value.pop() : value;

const FLAGS = {
	concurrency: {
		alias: 'c',
		coerce: coerceLastValue,
		description: 'Max number of test files running at the same time (default: CPU cores)',
		type: 'number',
	},
	'fail-fast': {
		coerce: coerceLastValue,
		description: 'Stop after first test failure',
		type: 'boolean',
	},
	match: {
		alias: 'm',
		description: 'Only run tests with matching title (can be repeated)',
		type: 'string',
	},
	'no-worker-threads': {
		coerce: coerceLastValue,
		description: 'Don\'t use worker threads',
		type: 'boolean',
	},
	'node-arguments': {
		coerce: coerceLastValue,
		description: 'Additional Node.js arguments for launching worker processes (specify as a single string)',
		type: 'string',
	},
	serial: {
		alias: 's',
		coerce: coerceLastValue,
		description: 'Run tests serially',
		type: 'boolean',
	},
	tap: {
		alias: 't',
		coerce: coerceLastValue,
		description: 'Generate TAP output',
		type: 'boolean',
	},
	timeout: {
		alias: 'T',
		coerce: coerceLastValue,
		description: 'Set global timeout (milliseconds or human-readable, e.g. 10s, 2m)',
		type: 'string',
	},
	'update-snapshots': {
		alias: 'u',
		coerce: coerceLastValue,
		description: 'Update snapshots',
		type: 'boolean',
	},
	verbose: {
		alias: 'v',
		coerce: coerceLastValue,
		description: 'Enable verbose output (default)',
		type: 'boolean',
	},
	watch: {
		alias: 'w',
		coerce: coerceLastValue,
		description: 'Re-run tests when files change',
		type: 'boolean',
	},
};

export default async function loadCli() { // eslint-disable-line complexity
	let conf;
	let confError;
	try {
		const {argv: {config: configFile}} = yargs(hideBin(process.argv)).help(false).version(false);
		const loaded = await loadConfig({configFile});
		if (loaded.unsupportedFiles.length > 0) {
			console.log(chalk.magenta(
				`  ${figures.warning} AVA does not support JSON config, ignoring:\n\n    ${loaded.unsupportedFiles.join('\n    ')}`,
			));
		}

		conf = loaded.config;
		if (conf.configFile && path.basename(conf.configFile) !== path.relative(conf.projectDir, conf.configFile)) {
			console.log(chalk.magenta(`  ${figures.warning} Using configuration from ${conf.configFile}`));
		}
	} catch (error) {
		confError = error;
	}

	// Enter debug mode if the main process is being inspected. This assumes the
	// worker processes are automatically inspected, too. It is not necessary to
	// run AVA with the debug command, though it's allowed.
	let activeInspector = false;
	try {
		const {default: inspector} = await import('node:inspector');

		activeInspector = inspector.url() !== undefined;
	} catch {}

	let debug = activeInspector
		? {
			active: true,
			break: false,
			files: [],
			host: undefined,
			port: undefined,
		} : null;

	let resetCache = false;
	const {argv} = yargs(hideBin(process.argv))
		.scriptName('ava')
		.version(pkg.version)
		.parserConfiguration({
			'boolean-negation': true,
			'camel-case-expansion': false,
			'combine-arrays': false,
			'dot-notation': false,
			'duplicate-arguments-array': true,
			'flatten-duplicate-arrays': true,
			'negation-prefix': 'no-',
			'parse-numbers': true,
			'populate--': true,
			'set-placeholder-key': false,
			'short-option-groups': true,
			'strip-aliased': true,
			'unknown-options-as-args': false,
		})
		.usage('$0 [<pattern>...]')
		.usage('$0 debug [<pattern>...]')
		.usage('$0 reset-cache')
		.options({
			color: {
				description: 'Force color output',
				type: 'boolean',
			},
			config: {
				description: 'Specific JavaScript file for AVA to read its config from, instead of using package.json or ava.config.* files',
			},
		})
		.command('* [<pattern>...]', 'Run tests', yargs => yargs.options(FLAGS).positional('pattern', {
			array: true,
			describe: 'Select which test files to run. Leave empty if you want AVA to run all test files as per your configuration. Accepts glob patterns, directories that (recursively) contain test files, and file paths optionally suffixed with a colon and comma-separated numbers and/or ranges identifying the 1-based line(s) of specific tests to run',
			type: 'string',
		}), argv => {
			if (activeInspector) {
				debug.files = argv.pattern ?? [];
			}
		})
		.command(
			'debug [<pattern>...]',
			'Activate Node.js inspector and run a single test file',
			yargs => yargs.options(FLAGS).options({
				break: {
					description: 'Break before the test file is loaded',
					type: 'boolean',
				},
				host: {
					default: '127.0.0.1',
					description: 'Address or hostname through which you can connect to the inspector',
					type: 'string',
				},
				port: {
					default: 9229,
					description: 'Port on which you can connect to the inspector',
					type: 'number',
				},
			}).positional('pattern', {
				demand: true,
				describe: 'Glob pattern to select a single test file to debug, optionally suffixed with a colon and comma-separated numbers and/or ranges identifying the 1-based line(s) of specific tests to run',
				type: 'string',
			}),
			argv => {
				debug = {
					active: activeInspector,
					break: argv.break === true,
					files: argv.pattern,
					host: argv.host,
					port: argv.port,
				};
			})
		.command(
			'reset-cache',
			'Delete any temporary files and state kept by AVA, then exit',
			yargs => yargs,
			() => {
				resetCache = true;
			})
		.example('$0')
		.example('$0 test.js')
		.example('$0 test.js:4,7-9')
		.help();

	const combined = {...conf};

	for (const flag of Object.keys(FLAGS)) {
		if (flag === 'no-worker-threads' && Object.hasOwn(argv, 'worker-threads')) {
			combined.workerThreads = argv['worker-threads'];
			continue;
		}

		if (argv[flag] !== undefined) {
			if (flag === 'fail-fast') {
				combined.failFast = argv[flag];
			} else if (flag === 'update-snapshots') {
				combined.updateSnapshots = argv[flag];
			} else if (flag !== 'node-arguments') {
				combined[flag] = argv[flag];
			}
		}
	}

	const chalkOptions = {level: 0};
	if (combined.color !== false) {
		const {supportsColor: {level}} = await import('chalk'); // eslint-disable-line unicorn/import-style
		chalkOptions.level = level;
	}

	const {set: setChalk} = await import('./chalk.js');
	setChalk(chalkOptions);

	if (confError) {
		if (confError.cause) {
			exit(`${confError.message}\n\n${chalk.gray(confError.cause?.stack ?? confError.cause)}`);
		} else {
			exit(confError.message);
		}
	}

	const {nonSemVerExperiments: experiments, projectDir} = conf;
	if (resetCache) {
		const cacheDir = path.join(projectDir, 'node_modules', '.cache', 'ava');
		try {
			let entries;
			try {
				entries = fs.readdirSync(cacheDir);
			} catch (error) {
				if (error.code === 'ENOENT') {
					entries = [];
				} else {
					throw error;
				}
			}

			for (const entry of entries) {
				fs.rmSync(path.join(cacheDir, entry), {recursive: true, force: true});
			}

			if (entries.length === 0) {
				console.log(`\n${chalk.green(figures.tick)} No cache files to remove`);
			} else {
				console.log(`\n${chalk.green(figures.tick)} Removed AVA cache files in ${cacheDir}`);
			}

			process.exit(0); // eslint-disable-line unicorn/no-process-exit
		} catch (error) {
			exit(`Error removing AVA cache files in ${cacheDir}\n\n${chalk.gray(error?.stack ?? error)}`);
		}
	}

	if (argv.watch) {
		if (argv.tap && !conf.tap) {
			exit('The TAP reporter is not available when using watch mode.');
		}

		if (isCi) {
			exit('Watch mode is not available in CI, as it prevents AVA from terminating.');
		}

		if (debug !== null && !process.env.TEST_AVA) {
			exit('Watch mode is not available when debugging.');
		}
	}

	if (debug !== null) {
		if (argv.tap && !conf.tap) {
			exit('The TAP reporter is not available when debugging.');
		}

		if (isCi) {
			exit('Debugging is not available in CI.');
		}

		if (combined.timeout) {
			console.log(chalk.magenta(`  ${figures.warning} The timeout option has been disabled to help with debugging.`));
		}
	}

	if (Object.hasOwn(combined, 'concurrency') && (!Number.isInteger(combined.concurrency) || combined.concurrency < 0)) {
		exit('The --concurrency or -c flag must be provided with a non-negative integer.');
	}

	if (Object.hasOwn(conf, 'sortTestFiles') && typeof conf.sortTestFiles !== 'function') {
		exit('’sortTestFiles’ must be a comparator function.');
	}

	if (Object.hasOwn(conf, 'watch')) {
		exit('’watch’ must not be configured, use the --watch CLI flag instead.');
	}

	if (Object.hasOwn(conf, 'ignoredByWatcher')) {
		exit('’ignoredByWatcher’ has moved to ’watchMode.ignoreChanges’.');
	}

	if (!combined.tap && Object.keys(experiments).length > 0) {
		console.log(chalk.magenta(`  ${figures.warning} Experiments are enabled. These are unsupported and may change or be removed at any time.`));
	}

	let projectPackageObject;
	try {
		projectPackageObject = JSON.parse(fs.readFileSync(path.resolve(projectDir, 'package.json')));
	} catch (error) {
		if (error.code !== 'ENOENT') {
			throw error;
		}
	}

	const {type: defaultModuleType = 'commonjs'} = projectPackageObject ?? {};

	const providers = [];
	if (Object.hasOwn(conf, 'typescript')) {
		const {default: providerManager} = await import('./provider-manager.js');
		try {
			const {identifier: protocol, level, main} = await providerManager.typescript(projectDir);
			providers.push({
				level,
				protocol,
				main: main({config: conf.typescript}),
				type: 'typescript',
			});
		} catch (error) {
			exit(error.message);
		}
	}

	let environmentVariables;
	try {
		environmentVariables = validateEnvironmentVariables(conf.environmentVariables);
	} catch (error) {
		exit(error.message);
	}

	let extensions;
	try {
		extensions = normalizeExtensions(conf.extensions, providers);
	} catch (error) {
		exit(error.message);
	}

	let moduleTypes;
	try {
		moduleTypes = normalizeModuleTypes(conf.extensions, defaultModuleType, experiments);
	} catch (error) {
		exit(error.message);
	}

	let globs;
	try {
		globs = normalizeGlobs({
			files: conf.files, ignoredByWatcher: conf.watchMode?.ignoreChanges, extensions, providers,
		});
	} catch (error) {
		exit(error.message);
	}

	let nodeArguments;
	try {
		nodeArguments = normalizeNodeArguments(conf.nodeArguments, argv['node-arguments']);
	} catch (error) {
		exit(error.message);
	}

	let parallelRuns = null;
	if (isCi && combined.utilizeParallelBuilds !== false) {
		const {default: ciParallelVars} = await import('ci-parallel-vars');
		if (ciParallelVars) {
			const {index: currentIndex, total: totalRuns} = ciParallelVars;
			parallelRuns = {currentIndex, totalRuns};
		}
	}

	const match = combined.match === '' ? [] : arrify(combined.match);

	const input = debug ? debug.files : (argv.pattern ?? []);
	const filter = input
		.map(pattern => splitPatternAndLineNumbers(pattern))
		.map(({pattern, ...rest}) => ({
			pattern: normalizePattern(path.relative(projectDir, path.resolve(process.cwd(), pattern))),
			...rest,
		}));

	const api = new Api({
		cacheEnabled: combined.cache !== false,
		chalkOptions,
		concurrency: combined.concurrency ?? 0,
		workerThreads: combined.workerThreads !== false,
		debug,
		environmentVariables,
		experiments,
		extensions,
		failFast: combined.failFast,
		failWithoutAssertions: combined.failWithoutAssertions !== false,
		globs,
		match,
		moduleTypes,
		nodeArguments,
		parallelRuns,
		sortTestFiles: conf.sortTestFiles,
		projectDir,
		providers,
		ranFromCli: true,
		require: arrify(combined.require),
		serial: combined.serial,
		snapshotDir: combined.snapshotDir ? path.resolve(projectDir, combined.snapshotDir) : null,
		timeout: combined.timeout ?? '10s',
		updateSnapshots: combined.updateSnapshots,
		workerArgv: argv['--'],
	});

	let reporter;
	if (combined.tap && !argv.watch && debug === null) {
		const {default: TapReporter} = await import('./reporters/tap.js');
		reporter = new TapReporter({
			extensions: globs.extensions,
			projectDir,
			reportStream: process.stdout,
			stdStream: process.stderr,
		});
	} else {
		const {default: Reporter} = await import('./reporters/default.js');
		reporter = new Reporter({
			extensions: globs.extensions,
			projectDir,
			reportStream: process.stdout,
			stdStream: process.stderr,
			watching: argv.watch,
		});
	}

	if (process.env.TEST_AVA) {
		const {controlFlow} = await import('./ipc-flow-control.cjs');
		const bufferedSend = controlFlow(process);

		api.on('run', plan => {
			plan.status.on('stateChange', evt => {
				bufferedSend(evt);
			});
		});
	}

	if (combined.observeRun && experiments.observeRunsFromConfig) {
		combined.observeRun({
			events: asyncEventIteratorFromApi(api),
		});
	}

	api.on('run', plan => {
		reporter.startRun(plan);

		plan.status.on('stateChange', evt => {
			if (evt.type === 'end' || evt.type === 'interrupt') {
				// Write out code coverage data when the run ends, lest a process
				// interrupt causes it to be lost.
				v8.takeCoverage();
			}

			if (evt.type === 'interrupt') {
				reporter.endRun();
				process.exit(1); // eslint-disable-line unicorn/no-process-exit
			}
		});
	});

	if (argv.watch) {
		const {available, start} = await import('./watcher.js');
		if (!available(projectDir)) {
			exit('Watch mode requires support for recursive fs.watch()');
			return;
		}

		let abortController;
		if (process.env.TEST_AVA) {
			const {takeCoverage} = await import('node:v8');
			abortController = new AbortController();
			process.on('message', message => {
				if (message === 'abort-watcher') {
					abortController.abort();
					takeCoverage();
				}
			});
			process.channel?.unref();
		}

		start({
			api,
			filter,
			globs,
			projectDir,
			providers,
			reporter,
			stdin: process.stdin,
			signal: abortController?.signal,
		});
	} else {
		let debugWithoutSpecificFile = false;
		api.on('run', plan => {
			if (debug !== null && plan.files.length !== 1) {
				debugWithoutSpecificFile = true;
			}
		});

		const runStatus = await api.run({filter});

		if (debugWithoutSpecificFile && !debug.active) {
			exit('Provide the path to the test file you wish to debug');
			return;
		}

		process.exitCode = runStatus.suggestExitCode({matching: match.length > 0});
		reporter.endRun();
	}
}