// Function.prototype.bind polyfill
if ( !Function.prototype.bind ) {
  Function.prototype.bind = function( obj ) {
    if(typeof this !== 'function') // closest thing possible to the ECMAScript 5 internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');

    var slice = [].slice,
        args = slice.call(arguments, 1), 
        self = this, 
        nop = function () {}, 
        bound = function () {
          return self.apply( this instanceof nop ? this : ( obj || {} ), 
                              args.concat( slice.call(arguments) ) );    
        };

    bound.prototype = this.prototype;

    return bound;
  };
}

var likeCounter = {

    // latest count value
    count: 3936038,
    // target element selector
    target: null,
    // refresh interval (0 to disable refresh)
    refresh: 0,

    init: function (params) {
        if ($(params.target).length == 0)
            throw 'LikeCounter: Target selector doesn\'t match any dom element.';

        if ($(params.target).length > 1)
            throw 'LikeCounter: Target selector matches more than one element.';

        this.target = params.target;
        this.refresh = params.refresh;

        $(this.target).text('3.936.038');

        if (this.refresh > 0) {
            setTimeout(this.update.bind(this), this.refresh);
        }
    },

    update: function () {
        $.ajax({
            url: '/likes/count',
            type: 'POST',
            timeout: '30000',
            context: this,
			dataType: 'json',
            success: function (result) {
                if (result.value > this.context.count) {
                    this.context.count = result.value;
                    $(this.context.target).text(result.valueDisplay);
                }
                setTimeout(this.context.update.bind(this.context), this.context.refresh);
            },
            error: function () {
                setTimeout(this.context.update.bind(this.context), this.context.refresh);
            }
        });
    }
};