<?php


class PoSync
{
    protected $path;
    protected $langPath;

    protected $langList;

    protected $langPrefix = [
        'en' => 'en',
        'de' => 'de',
    ];

    function __construct()
    {
        $this->init();
    }


    protected function init()
    {
        $this->path = __DIR__;
        $this->langPath = realpath(__DIR__ . '/../site/languages');
        $this->initAutoloader();
    }

    public function sync()
    {
        /** @var array [poName => ['msgId', ...], ...] */
        $allFileWords = [];
        /** @var array [lang => ['poName', ...], ...] */
        $langFileList = [];
        /** @var array [lang => [poName => Sepia\PoParser, ...], ...] */
        $langFileParser = [];

        $poList = $this->getPOFileList($this->langPath . '/en');
        foreach ($this->getLangList() as $lang) {
            $langPath = $this->langPath . '/' . $lang;
            // $poList = $this->getPOFileList($langPath);
            $langFileList[$lang] = $poList;
            foreach ($poList as $poName) {
                $poFilename = $langPath . '/' . $poName;
                file_exists($poFilename) or touch($poFilename);
                /** @var \Sepia\PoParser $parser */
                $parser = Sepia\PoParser::parseFile($poFilename);
                $parser->filename = $poFilename;
                $langFileParser[$lang][$poName] = $parser;
                $entries = $parser->getEntries();
                $entryKeys = array_keys($entries);
                $allFileWords[$poName] = (empty($allFileWords[$poName])) ? $entryKeys : array_merge($allFileWords[$poName], $entryKeys);
            }
        }

        foreach ($this->getLangList() as $lang) {
            foreach ($langFileList[$lang] as $poName) {
                /** @var \Sepia\PoParser $parser */
                $parser = $langFileParser[$lang][$poName];
                $entries = $parser->getEntries();
                if (($diff = array_diff($allFileWords[$poName], array_keys($entries)))) {
                    foreach ($diff as $msgId) {
                        echo "adding '{$msgId}' to '{$lang}/{$poName}'\n";
                        $parser->setEntry($msgId, [
                            'msgid'  => $msgId,
                            'msgstr' => ('en' === $lang ? '' : $this->langPrefix[$lang] . ' ') . $msgId,
                        ]);
                    }
                    echo "saving '{$lang}/{$poName}'\n";
                    $parser->writeFile($parser->filename);
                }
            }
        }
    }

    protected function getLangList()
    {
        if (null === $this->langList) {
            $this->langList = [];
            if (($list = scandir($this->langPath))) {
                foreach ($list as $name) {
                    if ('.' !== $name[0] && is_dir($this->langPath . '/' . $name)) {
                        $this->langList[] = $name;
                    }
                }
            }
        }

        return $this->langList;
    }

    protected function getPOFileList($path)
    {
        $list = [];
        if (($rawList = scandir($path))) {
            foreach ($rawList as $name) {
                if ('.' !== $name[0] && false !== ($dotIdx = strrpos($name, '.')) && substr($name, $dotIdx) === '.po') {
                    $list[] = $name;
                }
            }
        }
        return $list;
    }

    protected function initAutoloader()
    {
        $classPath = $this->path . '/lib/PHP-po-parser';
        spl_autoload_register(function ($class) use ($classPath) {
            $class = str_replace('\\', '/', $class);
            $path = "{$classPath}/{$class}.php";
            if (file_exists($path)) {
                require $path;
            }
        });

        return $this;
    }

}

$sync = new PoSync();
$sync->sync();