function Rating(){
    this.ratingContainer = "js-rating-plugin";  // Rating block container class name
    this.localization = 'Рейтинг'; // Word that means rating in your local
    this.userVoteInfo = {}; //Information about user votes for each element on page
	var _this = this;  // For namespace vision inside function passed as argument



    this.initialize = function(){

        var ratingViews = document.getElementsByClassName(this.ratingContainer); //Detect all rating blocks on page
        if(ratingViews) {
            userVotes(sortTargets(ratingViews));

            for (var i = 0; i < ratingViews.length; i++) {
                this.showRating(ratingViews[i]);
            }
        }

    };
	
	
	// Shows rating for passed element
	this.showRating = function(ratingContainer){

        var target = ratingContainer.getAttribute('data-target');
        var targetId = Number(ratingContainer.getAttribute('data-target-id'));
        ratingContainer.setAttribute('id', target+targetId);

        if(target in _this.userVoteInfo == false){
            _this.userVoteInfo[target]  = {};
        }
        if(targetId in _this.userVoteInfo[target] == false){
            _this.userVoteInfo[target][targetId] = {'userVoted': false, rating: 0};
        }

		var rating = 'rating' in _this.userVoteInfo[target][targetId] ? _this.userVoteInfo[target][targetId]['rating'] : 0;


        var rateSpan = document.createElement('span');
        rateSpan.className = 'total-rating';
        rateSpan.innerHTML = rating>0 ? '+' + rating : rating;
        rateSpan.title = this.localization;


        var rateItem = document.createElement('span');
        rateItem.className = 'rate-word';
        rateItem.innerHTML = 'Проголосовать ';



		if (this.userCanVote(target, targetId)){ //Checking it just to prevent unnecessary events below


            var rateDown = document.createElement('span');
            rateDown.className = 'minus rate-down';

            var rateUp = document.createElement('span');
            rateUp.className = 'plus rate-up';


            if(target == 'posts'){
                ratingContainer.appendChild(rateItem); //Если предметом голосования явяется пост, то выводим текст "проголосовать"
            }
            ratingContainer.appendChild(rateDown);
            ratingContainer.appendChild(rateSpan);
            ratingContainer.appendChild(rateUp);

		} else{

            if(target == 'posts'){
                rateItem.innerHTML = 'Рейтинг';
                ratingContainer.appendChild(rateItem);
            }
            ratingContainer.appendChild(rateSpan);
        }





	};





	//Returns information about items if they are already rated by user either not
	var userVotes = function(targets) {
        $.ajax({
            async: false,
            type: "POST",
            data: {rating_plugin_targets: targets},
            url: "/index.php?getElementsRating",
            success: function (jsoned) {
                if(jsoned != '') {
                    try {
                        _this.userVoteInfo = JSON && JSON.parse(jsoned) || $.parseJSON(jsoned);
                    } catch(e){
                        _this.userVoteInfo = {};
                    }
                }
            },
            error:function(){
                console.log('some troubles with rating plugin');
            }
        });
	};




    // Returns bool if user can vote to target
    this.userCanVote = function(target, targetId){
        if(target in this.userVoteInfo === false || targetId in this.userVoteInfo[target] === false){
            return true;
        }

        return !this.userVoteInfo[target][targetId]['userVoted'];

    };







    //Votes for target
	this.vote = function(target, targetId, rate){

	  rate = parseInt(rate, 10);

	  if(rate>=-1 && rate<=1){
		$.ajax({
			async: false,
			type: "POST",
			data: {"rating_plugin_target":target, "rating_plugin_target_id" : targetId, "rating_plugin_rating" : rate},
			url: "/index.php?voteForElement",
			success: function(result){

                if(result == null){
                    return false;
                }


                if(target in _this.userVoteInfo == false){
                    _this.userVoteInfo[target] = {};
                }
                if(targetId in _this.userVoteInfo[target] == false){
                    _this.userVoteInfo[target][targetId] = {'userVoted': false, rating: 0};
                }

                _this.userVoteInfo[target][targetId] = {'userVoted':true, 'rating':rate};

                var nowRating =  parseInt($('#'+target+targetId+" > .total-rating").html(), 10) + rate;
                var rating = nowRating>0 ? '+' + nowRating : nowRating;
                $('#'+target+targetId+" > .total-rating").html(rating);
                $('#'+target+targetId+" > .rate-up").remove();
                $('#'+target+targetId+" > .rate-down").remove();
                $('#'+target+targetId+" > .rate-word").html('Рейтинг');
                popUpWindow('Ваш голос учтен', 'success');

                return true;
            },
            error:function(){
                popUpWindow('Не удалось проголсовать', 'error');
            }
		  });
	   }
	};





    //Sort elements by targets
    var sortTargets = function(targets){

        var targetsSorted = {};

        if(targets instanceof Object){
            for(var i=0; i<targets.length; i++){
                var target = targets[i].getAttribute('data-target');
                var targetId = targets[i].getAttribute('data-target-id');

                if(target in targetsSorted == false){
                    targetsSorted[target] = {};
                }

                targetsSorted[target][targetId] = [targetId];
            }
        }

        return targetsSorted;

    };





}


$(document).ready(function(){
    var RatingPluginInstance = new Rating();
    RatingPluginInstance.initialize();

    $(".rate-up").click(function(){
        var container = $(this).parent('.js-rating-plugin');
        var target = container.attr('data-target');
        var targetId = container.attr('data-target-id');
        RatingPluginInstance.vote(target, targetId, 1);
    });


    $(".rate-down").click(function(){
        var container = $(this).parent();
        var target = container.attr('data-target');
        var targetId = container.attr('data-target-id');
        RatingPluginInstance.vote(target, targetId, -1);
    });
});