<?php

// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id$

/**
 * Class to update a language.php file with the translations
 * done in another language.php. Tipically used to keep language
 * files synchronized in different Tiki branches.
 */
class Language_MergeFiles
{
    /**
     * File used to collect new translations.
     * @var Language_File
     */
    private $sourceFile;

    /**
     * File that will be updated with new translations
     * done on $this->sourceFile.
     * @var Language_File
     */
    private $targetFile;

    public function __construct(Language_File $sourceFile, Language_File $targetFile)
    {
        $this->sourceFile = $sourceFile;
        $this->targetFile = $targetFile;
    }

    public function merge()
    {
        $sourceStrings = $this->sourceFile->parse();
        $targetStrings = $this->targetFile->parse();
        $toUpdate = [];

        foreach ($targetStrings as $key => $string) {
            if (
                isset($sourceStrings[$key]) && $sourceStrings[$key]['translated'] === true
                && (! isset($string['translation']) || $sourceStrings[$key]['translation'] != $string['translation'])
            ) {
                $toUpdate[$key] = $sourceStrings[$key]['translation'];
            }
        }

        // move the code that actually writes to the language.php to another class
        // that would handle every ways to write to a language.php file.
        $tmpFilePath = $this->targetFile->filePath . '.tmp';
        $handle = fopen($tmpFilePath, 'w');
        $lines = file($this->targetFile->filePath);

        if ($handle) {
            // foreach each line in the target file check decide whether to keep the
            // current translation or use the translation from the source file if one exists
            foreach ($lines as $line) {
                $matches = [];

                if (
                    preg_match('|^/?/?\s*\"(.*)\"\s*\=\>\s*\"(.*)\"\s*\,\s*$|', $line, $matches)
                    && isset($toUpdate[$matches[1]])
                ) {
                    fwrite($handle, "\"{$matches[1]}\" => \"{$toUpdate[$matches[1]]}\",\n");
                } else {
                    fwrite($handle, $line);
                }
            }

            rename($tmpFilePath, $this->targetFile->filePath);
        }
    }
}