#!/usr/bin/env node

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

/**
 * Internal dependencies.
 */
const {
	resolvePackage,
	resolvePackagePath,
} = require( '../utils' );
const {
	createLocalE2ePath,
	confirm,
	confirmLocalCopy,
	confirmLocalDelete,
	getPackageData,
	installDefaults,
} = require( '../utils/scaffold' );

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

// 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;
	}
}

/**
 * Install the test scripts and sample default.json configuration
 */
if ( command == 'install' ) {
	// Install some environment defaults if no package is requested.
	if ( ! packageName ) {
		installDefaults();
		return;
	}

	// `package` is a reserved word
	const pkg = resolvePackage( packageName ).name;
	if ( ! pkg.length ) {
		//@todo add error message
		return;
	}
	const { packageSlug, testSpecs, defaultJson, initializeSh } = getPackageData( pkg );

	// Write sample default.json
	if ( defaultJson ) {
		const defaultJsonName = `config${path.sep}default-${packageSlug}.json`;
		createLocalE2ePath( 'config' );
		if ( confirmLocalCopy( defaultJsonName, defaultJson, pkg ) ) {
			console.log( `Created sample test configuration to 'tests/e2e/${defaultJsonName}'.` );
		}
	}

	// Write sample initialize.sh
	if ( initializeSh ) {
		const defaultInitName = `docker${path.sep}${packageSlug}.sh`;
		createLocalE2ePath( 'docker' );
		if ( confirmLocalCopy( defaultInitName, initializeSh, pkg ) ) {
			console.log( `Created sample test container initialization script to 'tests/e2e/${defaultInitName}'.` );
		}
	}

	if ( ! testSpecs ) {
		return;
	}

	// Write test files
	const testsSpecFile = resolvePackagePath( testSpecs, pkg );
	const specs = fs.readFileSync( testsSpecFile );
	const tests = JSON.parse( specs );
	const { active, deprecated } = tests;

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

		// Create the specs folder if not present
		let specFolderPath = createLocalE2ePath( 'specs' );

		// Loop through folders and files to write test scripts.
		for ( let f = 0; f < active.length; f++ ) {
			if ( overwriteFiles == 'q' ) {
				overwriteFiles = '';
				break;
			}

			const testFolder = active[ f ];
			const { testFiles } = testFolder;

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

			let specFolder;
			if ( testFolder.name.length ) {
				specFolder = createLocalE2ePath( `specs${path.sep}${testFolder.name}` );
			} else {
				specFolder = specFolderPath;
			}

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

				const testFileName = `${testFolder.name}${path.sep}${testFile.name}.${testExtension}`;
				const testFilePath = `${specFolder}${path.sep}${testFile.name}.${testExtension}`;

				// Check to see if file exists.
				if ( fs.existsSync( testFilePath ) ) {
					if ( overwriteFiles != 'a' ) {
						confirmPrompt = `${testFileName} already exists. Overwrite? [y]es/[n]o/[a]ll/[q]uit: `;
						overwriteFiles = confirm( confirmPrompt, 'anqy' );
						overwriteFiles = overwriteFiles.toLowerCase();
					}

					if ( overwriteFiles == 'q' ) {
						break;
					}
					if ( overwriteFiles != 'a' && overwriteFiles != 'y' ) {
						continue;
					}
				}

				console.log( 'Writing tests/e2e/specs/' + 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;
				buffer.push( sprintf( importLineFormat, importPrefix + testImport ), blankLine );

				// Add test function calls and write the file
				let functionCalls = testFile.functions.map( functionName => functionName + '();' );
				buffer.push( ...functionCalls, blankLine );
				fs.writeFileSync( testFilePath, buffer.join( eol ) );
			}
		}
	}
	// @todo: deprecated files.
} else if ( command == 'uninstall' ) {
	if ( ! packageName ) {
		// @todo: write error message
		return;
	}

	const pkg = resolvePackage( packageName ).name;
	const { packageSlug, testSpecs, defaultJson, initializeSh } = getPackageData( pkg );

	// Delete sample default.json
	if ( defaultJson ) {
		const defaultJsonName = `config${path.sep}default-${packageSlug}.json`;
		confirmLocalDelete( defaultJsonName );
	}

	// Delete sample initialize.sh
	if ( initializeSh ) {
		const defaultInitName = `docker${path.sep}${packageSlug}.sh`;
		confirmLocalDelete( defaultInitName );
	}

	if ( ! testSpecs ) {
		return;
	}

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

	if ( ! active || ! active.length ) {
		return;
	}

	// Loop through folders and files to delete 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${path.sep}${testFolder.name}` : 'specs';
		for ( let t = 0; t < testFiles.length; t++ ) {
			const testFile = testFiles[ t ];
			const testFilePath = `${specFolder}${path.sep}${testFile.name}.${testExtension}`;

			confirmLocalDelete( testFilePath );
		}
	}

}