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/*
 * Metadata - jQuery plugin for parsing metadata from elements
 *
 * Copyright (c) 2006 John Resig, Yehuda Katz, Jorn Zaefferer, Paul McLanahan
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 */

/**
 * Sets the type of metadata to use. Metadata is encoded in JSON, and each property
 * in the JSON will become a property of the element itself.
 *
 * There are three supported types of metadata storage:
 *
 *   attr:  Inside an attribute. The name parameter indicates *which* attribute.
 *
 *   class: Inside the class attribute, wrapped in curly braces: { }
 *
 *   elem:  Inside a child element (e.g. a script tag). The
 *          name parameter indicates *which* element.
 *
 * The metadata for an element is loaded the first time the element is accessed via jQuery.
 *
 * As a result, you can define the metadata type, use $(expr) to load the metadata into the elements
 * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
 *
 * @name $.metadata.setType
 *
 * @example <p id="one" class="some_class {item_id: 1, item_label: 'Label'}">This is a p</p>
 * @before $.metadata.setType("class")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from the class attribute
 *
 * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'Label'}">This is a p</p>
 * @before $.metadata.setType("attr", "data")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from a "data" attribute
 *
 * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'Label'}</script>This is a p</p>
 * @before $.metadata.setType("elem", "script")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "Label"
 * @desc Reads metadata from a nested script element
 *
 * @param String type The encoding type
 * @param String name The name of the attribute to be used to get metadata (optional)
 * @cat Plugins/Metadata
 * @descr Sets the type of encoding to be used when loading metadata for the first time
 * @type undefined
 * @see metadata()
 */

(function($) {

$.extend({
	metadata : {
		defaults : {
			type: 'class',
			name: 'metadata',
			cre: /(\{.*\})/,
			single: 'metadata'
		},

		// Helper function to recursively sanitize object values
		sanitizeObject: function(obj) {
			if (!obj || typeof obj !== 'object') return obj;
			
			const result = Array.isArray(obj) ? [] : {};
			
			for (let key in obj) {
				const value = obj[key];
				
				// Skip functions entirely - prevent callback injection
				if (typeof value === 'function') continue;
				
				// Recursively sanitize nested objects/arrays
				if (value && typeof value === 'object') {
					result[key] = this.sanitizeObject(value);
				}
				// Sanitize all strings with DOMPurify
				else if (typeof value === 'string') {
					result[key] = DOMPurify.sanitize(value);
				}
				// Keep other primitive values as is
				else {
					result[key] = value;
				}
			}
			
			return result;
		},

		setType: function( type, name ){
			this.defaults.type = type;
			this.defaults.name = name;
		},

		get: function( elem, opts ){
			var data, m, e, attr,
				settings = $.extend({},this.defaults,opts);
			// check for empty string in single property
			if ( !settings.single.length ) { settings.single = 'metadata'; }

			data = $.data(elem, settings.single);
			// returned cached data if it already exists
			if ( data ) { return data; }

			data = "{}";

			if ( settings.type === "class" ) {
				m = settings.cre.exec( elem.className );
				if ( m ) { data = m[1]; }
			} else if ( settings.type === "elem" ) {
				if( !elem.getElementsByTagName ) { return undefined; }
				e = elem.getElementsByTagName(settings.name);
				if ( e.length ) { data = $.trim(e[0].innerHTML); }
			} else if ( elem.getAttribute !== undefined ) {
				attr = elem.getAttribute( settings.name );
				if ( attr ) { data = attr; }
			}

			if ( data.indexOf( '{' ) <0 ) { data = "{" + data + "}"; }

			try {
				// First try parsing as JSON
				data = JSON.parse(data);
			} catch(e) {
				try {
					// If JSON parsing fails, try to convert to valid JSON
					// Handle unquoted keys and convert single quotes to double quotes
					data = data.replace(/([{,]\s*)(['"])?([a-zA-Z0-9_]+)(['"])?:/g, '$1"$3":')
						.replace(/'/g, '"');  // Convert all single quotes to double quotes
					data = JSON.parse(data);
				} catch(e2) {
					// If both parsing attempts fail, return empty object
					data = {};
				}
			}

			// Sanitize the parsed data before storing
			data = this.sanitizeObject(data);

			$.data( elem, settings.single, data );
			return data;
		}
	}
});

/**
 * Returns the metadata object for the first member of the jQuery object.
 *
 * @name metadata
 * @descr Returns element's metadata object
 * @param Object opts An object contianing settings to override the defaults
 * @type jQuery
 * @cat Plugins/Metadata
 */
$.fn.metadata = function( opts ){
	return $.metadata.get( this[0], opts );
};

})(jQuery);