<?php

namespace WP_CLI\I18n;

use DirectoryIterator;
use Gettext\Translations;
use IteratorIterator;
use SplFileInfo;
use WP_CLI;
use WP_CLI\Utils;
use WP_CLI_Command;

class MakeMoCommand extends WP_CLI_Command {
	/**
	 * Create MO files from PO files.
	 *
	 * ## OPTIONS
	 *
	 * <source>
	 * : Path to an existing PO file or a directory containing multiple PO files.
	 *
	 * [<destination>]
	 * : Path to the destination file or directory for the resulting MO files. Defaults to the source directory.
	 *
	 * ## EXAMPLES
	 *
	 *     # Create MO files for all PO files in the current directory.
	 *     $ wp i18n make-mo .
	 *
	 *     # Create a MO file from a single PO file in a specific directory.
	 *     $ wp i18n make-mo example-plugin-de_DE.po languages
	 *
	 *     # Create a MO file from a single PO file to a specific file destination
	 *     $ wp i18n make-mo example-plugin-de_DE.po languages/bar.mo
	 *
	 * @when before_wp_load
	 *
	 * @throws WP_CLI\ExitException
	 */
	public function __invoke( $args, $assoc_args ) {
		$source = realpath( $args[0] );
		if ( ! $source || ( ! is_file( $source ) && ! is_dir( $source ) ) ) {
			WP_CLI::error( 'Source file or directory does not exist.' );
		}

		$destination      = is_file( $source ) ? dirname( $source ) : $source;
		$custom_file_name = null;
		if ( isset( $args[1] ) ) {
			$destination          = $args[1];
			$destination_pathinfo = pathinfo( $destination );
			// Destination is a file, make sure source is also a file
			if ( ! empty( $destination_pathinfo['filename'] ) && ! empty( $destination_pathinfo['extension'] ) ) {
				if ( ! is_file( $source ) ) {
					WP_CLI::error( 'Destination file not supported when source is a directory.' );
				}
				$destination      = $destination_pathinfo['dirname'];
				$custom_file_name = $destination_pathinfo['filename'] . '.' . $destination_pathinfo['extension'];
			}
		}

		if ( ! is_dir( $destination ) && ! mkdir( $destination, 0777, true ) ) {
			WP_CLI::error( 'Could not create destination directory.' );
		}

		if ( is_file( $source ) ) {
			$files = [ new SplFileInfo( $source ) ];
		} else {
			$files = new IteratorIterator( new DirectoryIterator( $source ) );
		}

		$result_count = 0;
		/** @var DirectoryIterator $file */
		foreach ( $files as $file ) {
			if ( 'po' !== $file->getExtension() ) {
				continue;
			}

			if ( ! $file->isFile() || ! $file->isReadable() ) {
				WP_CLI::warning( sprintf( 'Could not read file %s', $file->getFilename() ) );
				continue;
			}

			$file_basename = basename( $file->getFilename(), '.po' );
			$file_name     = $file_basename . '.mo';
			if ( $custom_file_name ) {
				$file_name = $custom_file_name;
			}
			$destination_file = "{$destination}/{$file_name}";

			$translations = Translations::fromPoFile( $file->getPathname() );
			if ( ! $translations->toMoFile( $destination_file ) ) {
				WP_CLI::warning( sprintf( 'Could not create file %s', $destination_file ) );
				continue;
			}

			++$result_count;
		}

		WP_CLI::success( sprintf( 'Created %d %s.', $result_count, Utils\pluralize( 'file', $result_count ) ) );
	}
}