<?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 MakePhpCommand extends WP_CLI_Command {
    /**
     * Create PHP files from PO files.
     *
     * ## OPTIONS
     *
     * <source>
     * : Path to an existing PO file or a directory containing multiple PO files.
     *
     * [<destination>]
     * : Path to the destination directory for the resulting PHP files. Defaults to the source directory.
     *
     * ## EXAMPLES
     *
     *     # Create PHP files for all PO files in the current directory.
     *     $ wp i18n make-php .
     *     Success: Created 3 files.
     *
     *     # Create a PHP file from a single PO file in a specific directory.
     *     $ wp i18n make-php example-plugin-de_DE.po languages
     *     Success: Created 1 file.
     *
     * @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;
        if ( isset( $args[1] ) ) {
            $destination = $args[1];
        }

        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' );
            $destination_file = "{$destination}/{$file_basename}.l10n.php";

            $translations = Translations::fromPoFile( $file->getPathname() );
            if ( ! PhpArrayGenerator::toFile( $translations, $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 ) ) );
    }
}