/*
 * simplyScroll 1.0.4 - a scroll-tastic jQuery plugin
 *
 * http://logicbox.net/jquery/simplyscroll
 * http://logicbox.net/blog/simplyscroll-jquery-plugin
 * http://plugins.jquery.com/project/simplyScroll
 *
 * Copyright (c) 2009 Will Kelly - http://logicbox.net
 *
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * Last revised: 03/07/2009 21:13
 *
 */

(function($) {

    $.fn.simplyScroll = function(o) {
        return this.each(function() {
            new $.simplyScroll(this, o);
        });
    };

    var defaults = {
        className: 'simply-scroll',
        frameRate: 24, //No of movements per second
        speed: 1, //No of pixels per frame
        horizontal: true,
        autoMode: 'off', //disables buttons 'loop','bounce'
        pauseOnHover: true,
        startOnLoad: false, //use this if having rendering problems (safari 3 + Mac OSX?)
        localJsonSource: '', //format [{"src":"images/pic.jpg","title":"title","link":"http://"},{etc..}]
        flickrFeed: '',
        jsonImgWidth: 240,
        jsonImgHeight: 180
    };

    $.simplyScroll = function(el, o) {

        var self = this;

        this.o = $.extend({}, defaults, o || {});
        this.auto = this.o.autoMode !== "off" ? true : false;

        //called on ul/ol/div etc
        this.$list = $(el);

        //generate extra markup
        this.$list.addClass('simply-scroll-list')
		.wrap('<div class="simply-scroll-clip"></div>')
		.parent().wrap('<div class="' + this.o.className + ' simply-scroll-container"></div>');

        if (!this.o.auto) { //button placeholders
            this.$list.parent().parent()
		.prepend('<div class="simply-scroll-forward"></div>')
		.prepend('<div class="simply-scroll-back"></div>');
        }

        //load image data
        if (this.o.flickrFeed) {
            $.getJSON(this.o.flickrFeed + "&format=json&jsoncallback=?",
			function(data) {
			    json = [];
			    $.each(data.items, function(i, item) {
			        json.push({
			            "src": item.media.m,
			            "title": item.title,
			            "link": item.link
			        });
			    });
			    self.renderData(json);
			}
		);
        } else if (this.o.localJsonSource) {
            $.getJSON(this.o.localJsonSource,
			function(json) {
			    self.renderData(json);
			}
		);
        } else {

            if (!this.o.startOnLoad) {
                this.init();
            } else {
                //wait for load before completing setup
                $(window).load(function() { self.init(); });
            }

        }

    };

    $.simplyScroll.fn = $.simplyScroll.prototype = {};

    $.simplyScroll.fn.extend = $.simplyScroll.extend = $.extend;

    $.simplyScroll.fn.extend({
        init: function() {
            //shortcuts
            this.$items = this.$list.children();
            this.$clip = this.$list.parent();
            this.$container = this.$clip.parent();

            if (!this.o.horizontal) {
                this.itemMax = this.$items[0].offsetHeight; //this.$items[0].offsetHeight;
                this.clipMax = this.$clip.height(); //this.$clip[0].offsetHeight;
                this.dimension = 'height';
                this.moveBackClass = 'simply-scroll-btn-up';
                this.moveForwardClass = 'simply-scroll-btn-down';
            } else {
                this.itemMax = this.$items[0].offsetWidth;
                this.clipMax = this.$clip.width();
                this.dimension = 'width';
                this.moveBackClass = 'simply-scroll-btn-left';
                this.moveForwardClass = 'simply-scroll-btn-right';
            }

            this.posMin = 0;
            
            
            this.posMax = this.$items.length * this.itemMax + 30;
            this.$list.css(this.dimension, this.posMax + 50 + 'px');

            if (this.o.autoMode == 'loop') {
                var addItems = Math.ceil(this.clipMax / this.itemMax);
                this.$items.slice(0, addItems).clone(true).appendTo(this.$list);
                this.posMax += (this.clipMax - this.o.speed);
                this.$list.css(this.dimension, this.posMax + (this.itemMax * addItems) + 'px');
            }

            this.interval = null;
            this.intervalDelay = Math.floor(1000 / this.o.frameRate);

            //ensure that speed is divisible by item width
            while (this.itemMax % this.o.speed !== 0) {
                this.o.speed--;
                if (this.o.speed === 0) {
                    this.o.speed = 1; break;
                }
            }

            var self = this;
            this.trigger = null;
            this.funcMoveBack = function() { self.trigger = this; self.moveBack(); };
            this.funcMoveForward = function() { self.trigger = this; self.moveForward(); };
            this.funcMoveStop = function() { self.moveStop(); };
            this.funcMoveResume = function() { self.moveResume(); };

            if (this.auto) {
                if (this.o.pauseOnHover) {
                    this.$clip.hover(this.funcMoveStop, this.funcMoveResume);
                }
                this.moveForward();
            } else {
                this.$btnBack = $('.simply-scroll-back', this.$container)
				.addClass('simply-scroll-btn' + ' ' + this.moveBackClass + ' ' + 'disabled')
				.hover(this.funcMoveBack, this.funcMoveStop);
                this.$btnForward = $('.simply-scroll-forward', this.$container)
				.addClass('simply-scroll-btn' + ' ' + this.moveForwardClass)
				.hover(this.funcMoveForward, this.funcMoveStop);
            }
        },
        moveForward: function() {
            var self = this;
            this.movement = 'forward';
            if (this.trigger !== null) {
                this.$btnBack.removeClass('disabled');
            }
            self.interval = setInterval(function() {
                if (!self.o.horizontal && self.$clip[0].scrollTop < (self.posMax - self.clipMax)) {
                    self.$clip[0].scrollTop += self.o.speed;
                } else if (self.o.horizontal && self.$clip[0].scrollLeft < (self.posMax - self.clipMax)) {
                    self.$clip[0].scrollLeft += self.o.speed;
                } else if (self.o.autoMode == 'loop') {
                    self.resetPos();
                } else {
                    self.moveStop(self.movement);
                }
            }, self.intervalDelay);
        },
        moveBack: function() {
            var self = this;
            this.movement = 'back';
            if (this.trigger !== null) {
                this.$btnForward.removeClass('disabled');
            }
            self.interval = setInterval(function() {
                if (!self.o.horizontal && self.$clip[0].scrollTop > 0) {
                    self.$clip[0].scrollTop -= self.o.speed;
                } else if (self.o.horizontal && self.$clip[0].scrollLeft > 0) {
                    self.$clip[0].scrollLeft -= self.o.speed;
                } else if (self.o.autoMode == 'loop') {
                    self.resetPos();
                } else {
                    self.moveStop(self.movement);
                }
            }, self.intervalDelay);
        },
        moveStop: function(moveDir) {
            clearInterval(this.interval);
            if (this.trigger !== null) {
                if (typeof moveDir != "undefined") {
                    $(this.trigger).addClass('disabled');
                }
                this.trigger = null;
            }
            if (this.auto) {
                if (this.o.autoMode == 'bounce') {
                    moveDir == 'forward' ? this.moveBack() : this.moveForward();
                }
            }
        },
        moveResume: function() {
            this.movement == 'forward' ? this.moveForward() : this.moveBack();
        },
        resetPos: function() {
            if (!this.o.horizontal) {
                this.$clip[0].scrollTop = 0;
            } else {
                this.$clip[0].scrollLeft = 0;
            }
        },
        renderData: function(json) {
            if (json.length > 0) { //render json data
                var self = this;
                $.each(json, function(i, item) {
                    $("<img/>").attr({
                        src: item.src,
                        title: item.title,
                        alt: item.title,
                        width: self.o.jsonImgWidth,
                        height: self.o.jsonImgHeight
                    }).appendTo(self.$list);
                });
                this.init();
            }
        }
    });

})(jQuery);