/** Octopart API - JavaScript Library
 *  andres@octopart.com
 *
 *  !!! THIS LIBRARY DEPENDS ON JQUERY IN 3 PLACES !!!
 *
 *  to instantiate a search client:
 *  client = octopart.SearchClient()
 * 
 *  to get 20 results for "tantalum capacitor":
 *  client.setQueryString('tantalum capacitor')
 *  client.submit({start:0,limit:20},function(response){
 *      for (i in response.results) {
 *          part = response.results[i].item;
 *          alert(part.manufacturer.displayname+' - '+part.mpn);
 *      }
 *  });
 */

(function(){
    // add library to window
    if (window.octopart) return;
    else window.octopart = {};


    var api_url = 'http://octopart.com/api/v2/';
    var api_key = null;


    // -------------- define search client ---------------------
    function SearchClient(args){
	args = args || {};
	this.reset();

	// set request args
	for (key in args) this.request[key] = args[key];
    };


    SearchClient.prototype.reset = function(){
	this.request = {};
    };


    SearchClient.prototype.addFilter = function(fieldname,value) {
	if (!this.request.filters) this.request.filters = [];
	this.request.filters.push([fieldname,[value]]);
    };


    SearchClient.prototype.addRangedFilter = function(fieldname,min,max){
	if (!this.request.rangedfilters) this.request.rangedfilters = [];
	this.request.rangedfilters.push([fieldname,[[min,max]]]);
    };


    SearchClient.prototype.deleteFilter = function(fieldname,value) {
	// This function deletes all filters on *fieldname*
	// TODO: remove only filters on *(fieldname,value)*
	this.request.filters = $.grep(this.request.filters, function(filter,i){
	    return (filter[0]!=fieldname && filter[1][0]!=value);
	});

	this.request.rangedfilters = $.grep(this.request.rangedfilters, function(filter,i){
	    return (filter[0]!=fieldname);
	});
    };


    SearchClient.prototype.setQueryString = function(querystring){
	this.request.q = querystring;
    };


    SearchClient.prototype.setSortBy = function(sortby){
	this.request.sortby = sortby;
    };


    SearchClient.prototype.submit = function(args,callback){
	args = args || {};

	var self = this;

	// build url arguments
	var urlargs = {};

	urlargs.q             = self.request.q;
	urlargs.filters       = JSON.stringify(self.request.filters || []);
	urlargs.rangedfilters = JSON.stringify(self.request.rangedfilters || []);
	urlargs.sortby        = JSON.stringify(self.request.sortby || [['score','desc']]);
	
	if ('start' in args) urlargs.start = args.start;
	if ('limit' in args) urlargs.limit = args.limit;
	if ('drilldown.include' in args) urlargs['drilldown.include'] = args['drilldown.include'];
	if ('drilldown.fieldname' in args) urlargs['drilldown.fieldname'] = args['drilldown.fieldname'];
	if ('drilldown.facets.start' in args) urlargs['drilldown.facets.start'] = args['drilldown.facets.start'];
	if ('drilldown.facets.limit' in args) urlargs['drilldown.facets.limit'] = args['drilldown.facets.limit'];
	if ('drilldown.facets.sortby' in args) urlargs['drilldown.facets.sortby'] = args['drilldown.facets.sortby'];
	if ('drilldown.facets.prefix' in args) urlargs['drilldown.facets.prefix'] = args['drilldown.facets.prefix'];

	if (api_key) urlargs['apikey'] = api_key;

	// send request
	$.getJSON(
	    api_url+'parts/search?callback=?',
	    urlargs,
	    function(response){
		// update client
		self.request = response.request;

		// instantiate part objects
		for (i in response.results) response.results[i].item = new Part(response.results[i].item);

		// execute callback
		if (callback) callback(response);
	    }
	);
    };


    // ---------- define Part class ------------------
    function Part(args){
	args = args || {};
	for (key in args) this[key] = args[key];
    };


    Part.prototype.getAttributeValues = function(fieldname){
	for (i in this.specs) {
	    if (this.specs[i].attribute.fieldname == fieldname) return this.specs[i].values;
	}
	return null;
    };


    // ----------- attach classes and methods to octopart library ---------------
    octopart.SearchClient = SearchClient;
    octopart.set_apiurl   = function(url){api_url = url;};
    octopart.set_apikey   = function(key){api_key = key;};
})();