<?php
/**
 * Leaflet Map Class File
 * 
 * PHP Version 5.5
 * 
 * @category Admin
 * @author   Benjamin J DeLong <ben@bozdoz.com>
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Leaflet Map Class
 */
class Leaflet_Map
{

    /**
     * Leaflet version
     * 
     * @var string major minor patch version
     */
    public static $leaflet_version = '1.3.4';

    /**
     * Number of maps on page; used for unique map ids
     * 
     * @var int $map_count
     */
    public $map_count = 0;

    /**
     * Files to include upon init
     * 
     * @var array $_shortcodes
     */
    private $_shortcodes = array(
        'leaflet-geojson' => array(
            'file' => 'class.geojson-shortcode.php',
            'class' => 'Leaflet_Geojson_Shortcode'
        ),
        'leaflet-image' => array(
            'file' => 'class.image-shortcode.php',
            'class' => 'Leaflet_Image_Shortcode'
        ),
        'leaflet-kml' => array(
            'file' => 'class.kml-shortcode.php',
            'class' => 'Leaflet_Kml_Shortcode'
        ),
        'leaflet-gpx' => array(
            'file' => 'class.gpx-shortcode.php',
            'class' => 'Leaflet_Gpx_Shortcode'
        ),
        'leaflet-line' => array(
            'file' => 'class.line-shortcode.php',
            'class' => 'Leaflet_Line_Shortcode'
        ),
        'leaflet-circle' => array(
            'file' => 'class.circle-shortcode.php',
            'class' => 'Leaflet_Circle_Shortcode'
        ),
        'leaflet-map' => array(
            'file' => 'class.map-shortcode.php',
            'class' => 'Leaflet_Map_Shortcode'
        ),
        'leaflet-marker' => array(
            'file' => 'class.marker-shortcode.php',
            'class' => 'Leaflet_Marker_Shortcode'
        )
    );

    /**
     * Singleton Instance of Leaflet Map
     * 
     * @var Leaflet_Map
     **/
    private static $instance = null;

    /**
     * Singleton init Function
     * 
     * @static
     */
    public static function init() {
        if ( !self::$instance ) {
            self::$instance = new self;
        }

        return self::$instance;
    }

    /**
     * Leaflet_Map Constructor
     */
    private function __construct() {
        $this->init_hooks();
        $this->add_shortcodes();

        // loaded
        do_action('leaflet_map_loaded');
    }

    /**
     * Add actions and filters
     */
    private function init_hooks()
    {

        // Leaflet_Map_Plugin_Settings
        include_once LEAFLET_MAP__PLUGIN_DIR . 'class.plugin-settings.php';

        // Leaflet_Map_Admin
        include_once LEAFLET_MAP__PLUGIN_DIR . 'class.admin.php';
        
        // init admin
        Leaflet_Map_Admin::init();

        add_action( 'plugins_loaded', array('Leaflet_Map', 'load_text_domain' ));
        
        add_action( 'wp_enqueue_scripts', array('Leaflet_Map', 'enqueue_and_register') );

        /* 
        allows maps on excerpts 
        todo? should be optional somehow (admin setting?)
        */
        add_filter('the_excerpt', 'do_shortcode');
    }

    /**
     * Includes and adds shortcodes
     */
    private function add_shortcodes()
    {
        // shortcodes
        $shortcode_dir = LEAFLET_MAP__PLUGIN_DIR . 'shortcodes/';
        
        foreach ($this->_shortcodes as $shortcode => $details) {
            include_once $shortcode_dir . $details['file'];
            add_shortcode($shortcode, array($details['class'], 'shortcode'));
        }
    }

    /**
     * Triggered when user uninstalls/removes plugin
     */
    public static function uninstall()
    {
        // remove settings in db
        // think it needs to be included again (because __construct 
        // won't need to execute)
        include_once LEAFLET_MAP__PLUGIN_DIR . 'class.plugin-settings.php';
        $settings = Leaflet_Map_Plugin_Settings::init();
        $settings->reset();

        // remove geocoder locations in db
        include_once LEAFLET_MAP__PLUGIN_DIR . 'class.geocoder.php';
        Leaflet_Geocoder::remove_caches();
    }

    /**
     * Loads Translations
     */
    public static function load_text_domain()
    {
        load_plugin_textdomain( 'leaflet-map', false, dirname( plugin_basename( LEAFLET_MAP__PLUGIN_FILE ) ) . '/languages/' );
    }

    /**
     * Enqueue and register styles and scripts (called in __construct)
     */
    public static function enqueue_and_register()
    {
        /* defaults from db */
        // Leaflet_Map_Plugin_Settings
        include_once LEAFLET_MAP__PLUGIN_DIR . 'class.plugin-settings.php';
        $settings = Leaflet_Map_Plugin_Settings::init();

        $js_url = $settings->get('js_url');
        $css_url = $settings->get('css_url');

        wp_register_style('leaflet_stylesheet', $css_url, Array(), null, false);
        wp_register_script('leaflet_js', $js_url, Array(), null, true);

        // new required MapQuest javascript file
        $tiling_service = $settings->get('default_tiling_service');

        if ($tiling_service == 'mapquest') {
            $mapquest_js_url = 'https://www.mapquestapi.com/sdk/leaflet/v2.2/mq-map.js?key=%s';
            $mq_appkey = $settings->get('mapquest_appkey');
            $mapquest_js_url = sprintf($mapquest_js_url, $mq_appkey);

            wp_register_script('leaflet_mapquest_plugin', $mapquest_js_url, Array('leaflet_js'), '2.0', true);
        }
        
        // optional ajax geojson plugin
        wp_register_script('tmcw_togeojson', 'https://cdn.rawgit.com/mapbox/togeojson/master/togeojson.js', Array('jquery'), LEAFLET_MAP__PLUGIN_VERSION, false);

        if (defined('WP_DEBUG') && WP_DEBUG) {
            $minified = '';
        } else {
            $minified = '.min';
        }

        wp_register_script('leaflet_ajax_geojson_js', plugins_url(sprintf('scripts/leaflet-ajax-geojson%s.js', $minified), __FILE__), Array('tmcw_togeojson', 'leaflet_js'), LEAFLET_MAP__PLUGIN_VERSION, false);

        wp_register_script('leaflet_svg_icon_js', plugins_url(sprintf('scripts/leaflet-svg-icon%s.js', $minified), __FILE__), Array('leaflet_js'), LEAFLET_MAP__PLUGIN_VERSION, false);
        
        /* run a construct function in the document head for subsequent functions to use (it is lightweight) */
        wp_enqueue_script('wp_leaflet_map', plugins_url(sprintf('scripts/construct-leaflet-map%s.js', $minified), __FILE__), Array('leaflet_js'), LEAFLET_MAP__PLUGIN_VERSION, false);
    }

    /**
     * Filter for removing nulls from array
     *
     * @param array $arr
     * 
     * @return array with nulls removed
     */
    public function filter_null($arr)
    {
        if (!function_exists('remove_null')) {
            function remove_null ($var) {
                return $var !== null;
            }
        }

        return array_filter($arr, 'remove_null');
    }

    /**
     * Sanitize JSON
     *
     * Takes options for filtering/correcting inputs for use in JavaScript
     *
     * @param array $arr     user-input array
     * @param array $args    array with key-value definitions on how to convert values
     * @return array corrected for JavaScript
     */
    public function json_sanitize($arr, $args)
    {
        // remove nulls
        $arr = self::filter_null($arr);

        // sanitize output
        $args = array_intersect_key($args, $arr);
        $arr = filter_var_array($arr, $args);

        return json_encode($arr);
    }

    /**
     * Get Style JSON for map shapes/geojson (svg or canvas)
     *
     * Takes atts for creating shapes on the map
     *
     * @param array $atts    user-input array
     * 
     * @return array corrected for JavaScript
     */
    public function get_style_json($atts)
    {
        if ($atts) {
            extract($atts);
        }

        // from http://leafletjs.com/reference-1.0.3.html#path
        $style = array(
            'stroke' => isset($stroke) ? $stroke : null,
            'color' => isset($color) ? $color : null,
            'weight' => isset($weight) ? $weight : null,
            'opacity' => isset($opacity) ? $opacity : null,
            'lineCap' => isset($linecap) ? $linecap : null,
            'lineJoin' => isset($linejoin) ? $linejoin : null,
            'dashArray' => isset($dasharray) ? $dasharray : null,
            'dashOffset' => isset($dashoffset) ? $dashoffset : null,
            'fill' => isset($fill) ? $fill : null,
            'fillColor' => isset($fillcolor) ? $fillcolor : null,
            'fillOpacity' => isset($fillopacity) ? $fillopacity : null,
            'fillRule' => isset($fillrule) ? $fillrule : null,
            'className' => isset($classname) ? $classname : null,
            );

        $args = array(
            'stroke' => FILTER_VALIDATE_BOOLEAN,
            'color' => FILTER_SANITIZE_STRING,
            'weight' => FILTER_VALIDATE_FLOAT,
            'opacity' => FILTER_VALIDATE_FLOAT,
            'lineCap' => FILTER_SANITIZE_STRING,
            'lineJoin' => FILTER_SANITIZE_STRING,
            'dashArray' => FILTER_SANITIZE_STRING,
            'dashOffset' => FILTER_SANITIZE_STRING,
            'fill' => FILTER_VALIDATE_BOOLEAN,
            'fillColor' => FILTER_SANITIZE_STRING,
            'fillOpacity' => FILTER_VALIDATE_FLOAT,
            'fillRule' => FILTER_SANITIZE_STRING,
            'className' => FILTER_SANITIZE_STRING
            );

        return $this->json_sanitize($style, $args);
    }

    /**
     * Add Popups to Shapes
     *
     * used by leaflet-marker, leaflet-line and leaflet-circle
     *
     * @param array  $atts    user-input array
     * @param string $content text to display
     * @param string $shape   JavaScript variable for shape
     *
     * @return null
     */
    public function add_popup_to_shape($atts, $content, $shape)
    {
        if (!empty($atts)) {
            extract($atts);
        }

        $message = empty($message) ? 
            (empty($content) ? '' : $content) : $message;
        $message = str_replace(array("\r\n", "\n", "\r"), '<br>', $message);
        $message = htmlspecialchars($message);
        $visible = empty($visible) ? false : ($visible == 'true');

        if (!empty($message)) {
            echo "{$shape}.bindPopup(window.WPLeafletMapPlugin.unescape('{$message}'))";
            if ($visible) {
                echo ".openPopup()";
            }
            echo ";";
        }
    }
}