#!/usr/bin/env node

/**
 * External dependencies.
 */
const fs = require( 'fs' );
const sprintf = require( 'sprintf-js' ).sprintf;

/**
 * Internal dependencies.
 */
const {
	resolveLocalE2ePath,
	resolvePackage,
	resolvePackagePath,
} = require( '../utils' );

const args = process.argv.slice( 2 );
const [ command, packageName ] = args;

/**
 * Install the test scripts and sample default.json configuration
 */
if ( command == 'install' ) {
	//**
	const package = resolvePackage( packageName ).name;
	if ( ! package.length ) {
		//@todo add error message
		return;
	}
	const packageSlug = package.replace( '@', '' ).replace( /\//g, '.' );
	const { packageInstallFiles } = require( package );
	const { testSpecs, defaultJson, initializeSh } = packageInstallFiles;

	// Write sample default.json
	if ( defaultJson ) {
		const defaultJsonName = `config/default-${packageSlug}.json`;
		const defaultJsonSample = resolveLocalE2ePath( defaultJsonName );
		const packageJsonSample = resolvePackagePath( defaultJson, package );
		fs.copyFileSync( packageJsonSample, defaultJsonSample );
		console.log( `\nCreated sample test configuration to 'tests/e2e/${defaultJsonName}'.\n` );
	}

	// Write sample initialize.sh
	if ( initializeSh ) {
		const defaultInitName = `docker/${packageSlug}.sh`;
		const defaultInitPath = resolveLocalE2ePath( defaultInitName );
		const packageInitPath = resolvePackagePath( initializeSh, package );
		fs.copyFileSync( packageInitPath, defaultInitPath );
		console.log( `\nCreated sample test container initialization script to 'tests/e2e/${defaultInitName}'.\n` );
	}

	// Write test files
	if ( ! testSpecs ) {
		return;
	}

	const testsSpecFile = resolvePackagePath( testSpecs, package );
	const specs = fs.readFileSync( testsSpecFile );
	const tests = JSON.parse( specs );
	const { active, deprecated } = tests;

	// Allow multiple spec file extensions and formats.
	let testExtension = 'test.js';
	let testFormat = '';
	for ( let a = 2; a < args.length; a++ ) {
		const nextArg = a + 1;
		if ( nextArg >= args.length ) {
			break;
		}
		switch ( args[ a ] ) {
			case '--format':
				testFormat = args[ nextArg ];
				break;
			case '--ext':
				testExtension = args[ nextArg ];
				break;
		}
	}

	if ( active && active.length ) {
		const eol = "\n";
		const autoGenerate = sprintf( '/* This file was auto-generated by the command `npx wc-e2e install %s. */', packageName );
		let importLineFormat;
		if ( testFormat.toLowerCase() == 'cjs' ) {
			importLineFormat = sprintf( "const {%%s} = require( '%s' );", package );
		} else {
			importLineFormat = sprintf( "import {%%s} from '%s';", package );
		}

		// Loop through folders and files to write test scripts.
		for ( let f = 0; f < active.length; f++ ) {
			const testFolder = active[ f ];
			const { testFiles } = testFolder;

			if ( ! testFiles || ! testFiles.length ) {
				continue;
			}

			const specFolder = testFolder.name.length ? `specs/${testFolder.name}` : 'specs';
			const specFolderPath = resolveLocalE2ePath( specFolder );

			// Create the test folder if it doesn't exist.
			if ( ! fs.existsSync( specFolderPath ) ) {
				fs.mkdirSync( specFolderPath );
			}

			// Create the test files.
			for ( let t = 0; t < testFiles.length; t++ ) {
				const testFile = testFiles[ t ];
				if ( ! testFile.functions.length ) {
					continue;
				}

				const testFileName = `${specFolder}/${testFile.name}.${testExtension}`;
				const testFilePath = resolveLocalE2ePath( testFileName );

				// @todo Add check to see if file exists
				// fs.existsSync
				// @todo Confirm overwrite
				// readline

				console.log( 'Writing tests/e2e/' + testFileName );
				let buffer = [ autoGenerate ];
				let testSeparator, testTerminator, importPrefix;

				// Add the import line.
				if ( testFile.functions.length > 3 ) {
					testSeparator = ',' + eol;
					testTerminator = eol;
					importPrefix = eol;
				} else {
					testSeparator = ', ';
					testTerminator = '';
					importPrefix = ' ';
				}
				const testImport = testFile.functions.join( testSeparator ) + testTerminator;
				// '' adds a blank line
				buffer.push( sprintf( importLineFormat, importPrefix + testImport ), '' );

				// Add test function calls and write the file
				let functionCalls = testFile.functions.map( functionName => functionName + '();' );
				buffer.push( ...functionCalls );
				fs.writeFileSync( testFilePath, buffer.join( eol ) );
			}
			console.log( eol );
		}
	}

	// @todo: deprecated files.
}