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<?php
/**
 * Allow the site viewer to select a localization (language).
 *
 * Only the zp-core and theme gettext() string are localized by this facility.
 *
 * If you want to support image descriptions, etc. in multiple languages you will
 * have to enable the <i>multi-lingual</i> option found next to the language selector on
 * the admin <i>Gallery</i> configuration page. Then you will have to provide appropriate
 * alternate translations for the fields you use. While there is a field for
 * strings for all Zenphoto supported languages you need supply only those you choose.
 * The others language strings will default to your local language.
 *
 * Locale selection may occur in several ways:
 * <ul>
 *  <li>A cookie stored when the user chooses his language</li>
 *  <li>The URI language selection provided by the <i>seo_locale</i> plugin</li>
 *  <li>The <i>subdomain locales</i> option</li>
 * </ul>
 *
 * This plugin applies only to the theme pages--not Admin. The <em>language cookie</i>, if set, will
 * carry over to the admin pages. As will using <i>subdomains</i>.
 *
 * @author Stephen Billard (sbillard)
 * @package plugins
 * @subpackage dynamic-locale
 */
$plugin_is_filter = 10 | CLASS_PLUGIN;
$plugin_description = gettext("Allows viewers of your site to select the language translation of their choice.");
$plugin_author = "Stephen Billard (sbillard)";
$plugin_category = gettext('SEO');
$option_interface = 'dynamic_locale';

zp_register_filter('theme_head', 'dynamic_locale::dynamic_localeJS');

if (getOption('dynamic_locale_subdomain')) {
    define('LOCALE_TYPE', 2);
} else if (extensionEnabled('seo_locale') && MOD_REWRITE) {
    define('LOCALE_TYPE', 1);
} else {
    define('LOCALE_TYPE', 0);
}

/**
 * prints a form for selecting a locale
 * The POST handling is by getUserLocale() called in functions.php
 *
 */
function printLanguageSelector($flags = NULL) {
    $localeOption = getOption('locale');
    $languages = generateLanguageList();
    if (isset($_REQUEST['locale'])) {
        $locale = sanitize($_REQUEST['locale']);
        if ($localeOption != $locale) {
            ?>
            <div class="errorbox">
                <h2>
                    <?php printf(gettext('<em>%s</em> is not available.'), html_encode($locale)); ?>
                    <?php printf(gettext('The locale %s is not supported on your server.'), html_encode($locale)); ?>
                    <br />
                    <?php echo gettext('See the troubleshooting guide on zenphoto.org for details.'); ?>
                </h2>
            </div>
            <?php
        }
    }
    if (is_null($flags)) {
        $flags = getOption('dynamic_locale_visual');
    }
    if ($flags) {
        asort($languages);
        ?>
        <ul class="flags">
            <?php
            $request = parse_url(getRequestURI());
            $separator = '?';
            if (isset($request['query'])) {
                $query = explode('&', $request['query']);
                $uri['query'] = '';
                foreach ($query as $key => $str) {
                    if (preg_match('/^locale\s*=/', $str)) {
                        unset($query[$key]);
                    }
                }
                if (empty($query)) {
                    unset($request['query']);
                } else {
                    $request['query'] = implode('&', $query);
                    $separator = '&';
                }
            }
            $uri = $request['path'];
            if (isset($request['query']))
                $uri .= '?' . $request['query'];
            foreach ($languages as $text => $lang) {
                ?>
                <li<?php if ($lang == $localeOption) echo ' class="currentLanguage"'; ?>>
                    <?php
                    switch (LOCALE_TYPE) {
                        case 2:
                            $path = dynamic_locale::fullHostPath($lang) . $uri;
                            break;
                        case 1:
                            $path = seo_locale::localePath(false, $lang) . str_replace(WEBPATH, '', $uri);
                            break;
                        default:
                            $path = $uri . $separator . 'locale=' . $lang;
                            break;
                    }
                    $flag = getLanguageFlag($lang);
                    if ($lang != $localeOption) {
                        ?>
                        <a href="<?php echo html_encode($path); ?>" >
                            <?php
                        }
                        ?>
                        <img src="<?php echo $flag; ?>" alt="<?php echo $text; ?>" title="<?php echo $text; ?>" />
                        <?php
                        if ($lang != $localeOption) {
                            ?>
                        </a>
                        <?php
                    }
                    ?>
                </li>
                <?php
            }
            ?>
        </ul>
        <?php
    } else {
        ?>
        <form action="#" method="post">
            <input type="hidden" name="oldlocale" value="<?php echo $localeOption; ?>" />
            <select id="dynamic-locale" class="languageselect" name="locale" onchange="this.form.submit()">
                <?php
                foreach ($languages as $key => $item) {
                    echo '<option class="languageoption" value="' . html_encode($item) . '"';
                    if ($item == $localeOption) {
                        echo ' selected="selected"';
                    }
                    echo ' >';
                    echo html_encode($key) . "</option>\n";
                }
                ?>
            </select>
        </form>
        <?php
    }
}

class dynamic_locale {

    function __construct() {
        setOptionDefault('dynamic_locale_visual', 0);
        setOptionDefault('dynamic_locale_subdomain', 0);
    }

    function getOptionsSupported() {
        global $_common_locale_type;
        $localdesc = '<p>' . gettext('If checked links to the alternative languages will be in the form <code><em>language</em>.domain</code> where <code><em>language</em></code> is the language code, e.g. <code><em>fr</em></code> for French.') . '</p>';
        if (!$_common_locale_type) {
            $localdesc .= '<p>' . gettext('This requires that you have created the appropriate subdomains pointing to your Zenphoto installation. That is <code>fr.mydomain.com/zenphoto/</code> must point to the same location as <code>mydomain.com/zenphoto/</code>. (Some providers will automatically redirect undefined subdomains to the main domain. If your provider does this, no subdomain creation is needed.)') . '</p>';
        }
        $options = array(gettext('Use flags')                        => array('key'      => 'dynamic_locale_visual', 'type'  => OPTION_TYPE_CHECKBOX,
                                        'order'  => 0,
                                        'desc'   => gettext('Checked produces an array of flags. Not checked produces a selector.')),
                        gettext('Use subdomains') . '*'  => array('key'          => 'dynamic_locale_subdomain', 'type'       => OPTION_TYPE_CHECKBOX,
                                        'order'      => 1,
                                        'disabled' => $_common_locale_type,
                                        'desc'       => $localdesc)
        );
        if ($_common_locale_type) {
            $options['note'] = array('key'       => 'dynamic_locale_type', 'type'    => OPTION_TYPE_NOTE,
                            'order'  => 2,
                            'desc'   => '<p class="notebox">' . $_common_locale_type . '</p>');
        } else {
            $_common_locale_type = gettext('* This option may be set via the <a onclick="gotoName(\'dynamic-locale\');"><em>dynamic-locale</em></a> plugin options.');
            $options['note'] = array('key'       => 'dynamic_locale_type',
                            'type'   => OPTION_TYPE_NOTE,
                            'order'  => 2,
                            'desc'   => gettext('<p class="notebox">*<strong>Note:</strong> The setting of this option is shared with other plugins.</p>'));
        }
        return $options;
    }

    static function dynamic_localeJS() {
        ?>
        <link type="text/css" rel="stylesheet" href="<?php echo WEBPATH . '/' . ZENFOLDER . '/' . PLUGIN_FOLDER; ?>/dynamic-locale/locale.css" />
        <?php
    }

    static function fullHostPath($lang) {
        global $_locale_Subdomains;
        $host = $_SERVER['HTTP_HOST'];
        $matches = explode('.', $host);
        if (validateLocale($matches[0], 'Dynamic Locale')) {
            array_shift($matches);
            $host = implode('.', $matches);
        }
        if ($l = $_locale_Subdomains[$lang]) {
            $host = $l . '.' . $host;
        }
        if (SERVER_PROTOCOL == 'https') {
            $host = 'https://' . $host;
        } else {
            $host = 'http://' . $host;
        }
        return $host;
    }

}
?>