<?php
namespace Ari_Stream_Quiz\Helpers;

class Helper {
    private static $system_args = array(
        'action',

        'msg',

        'msg_type',

        'noheader',
    );

    private static $quiz_types = array(
        ARISTREAMQUIZ_QUIZTYPE_TRIVIA,
    );

    private static $themes = null;

    public static function build_url( $add_args = array(), $remove_args = array(), $remove_system_args = true, $encode_args = true ) {
        if ( $remove_system_args ) {
            $remove_args = array_merge( $remove_args, self::$system_args );
        }

        if ( $encode_args )
            $add_args = array_map( 'rawurlencode', $add_args );

        return add_query_arg( $add_args, remove_query_arg( $remove_args ) );
    }

    public static function is_valid_quiz_type( $type ) {
        return $type && in_array( $type, self::$quiz_types );
    }

    public static function get_themes() {
        if ( ! is_null( self::$themes ) ) {
            return self::$themes;
        }

        $folders = array();
        $path = ARISTREAMQUIZ_THEMES_PATH;
        $exclude = array( 'assets' );

        if ( ! ( $handle = @opendir( $path ) ) ) {
            return $folders;
        }

        while ( false !== ( $file = readdir( $handle ) ) ) {
            if ( '.' == $file || '..' == $file || in_array( $file, $exclude ) )
                continue ;

            $is_dir = is_dir( $path . $file );

            if ( ! $is_dir )
                continue ;

            $folders[] = $file;
        }

        self::$themes = $folders;

        return self::$themes;
    }

    public static function resolve_theme_name( $theme ) {
        $themes = self::get_themes();

        if ( ! in_array( $theme, $themes ) )
            $theme = ARISTREAMQUIZ_THEME_DEFAULT;

        return $theme;
    }

    public static function quiz_type_nicename( $quiz_type ) {
        $nicename = '';

		if ( ARISTREAMQUIZ_QUIZTYPE_TRIVIA == $quiz_type ) {
            $nicename = __( 'Trivia', 'ari-stream-quiz' );
        }

        return $nicename;
    }

    public static function can_edit_other_quizzes() {
        return current_user_can( 'edit_others_posts' );
    }

    public static function can_edit_quiz( $quiz_id ) {
        if ( self::can_edit_other_quizzes() )
            return true;

        $can_edit = false;

        $quiz_id = intval( $quiz_id, 10 );
        if ( $quiz_id < 1 )
            return $can_edit;

        $quizzes_model = new \Ari_Stream_Quiz\Models\Quizzes(
            array(
                'class_prefix' => 'Ari_Stream_Quiz'
            )
        );
        $quiz_author_id = $quizzes_model->get_quiz_author_id( $quiz_id );
        if ( $quiz_author_id > 0 && get_current_user_id() == $quiz_author_id ) {
            $can_edit = true;
        }

        return $can_edit;
    }

    public static function filter_edit_quizzes( $id_list ) {
        if ( self::can_edit_other_quizzes() )
            return $id_list;

        $id_list = \Ari\Utils\Array_Helper::to_int( $id_list, 1 );

        if ( count( $id_list ) == 0 )
            return $id_list;

        $quizzes_model = new \Ari_Stream_Quiz\Models\Quizzes(
            array(
                'class_prefix' => 'Ari_Stream_Quiz'
            )
        );
        $quizzes_author_id = $quizzes_model->get_quizzes_author_id( $id_list );

        $filter_id_list = array();
        $user_id = get_current_user_id();

        foreach ( $id_list as $quiz_id ) {
            if ( isset( $quizzes_author_id[$quiz_id] ) ) {
                $quiz_author_id = $quizzes_author_id[$quiz_id]->author_id;

                if ( $user_id == $quiz_author_id )
                    $filter_id_list[] = $quiz_id;
            }
        }

        return $filter_id_list;
    }
}