/*
* 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: 100,
        speed: 1,
        horizontal: true,
        autoMode: 'off',
        pauseOnHover: true,
        startOnLoad: false,
        localJsonSource: '',
        flickrFeed: '',
        jsonImgWidth: 240,
        jsonImgHeight: 180
    };
    $.simplyScroll = function (el, o) {
        var self = this;
        this.o = $.extend({}, defaults, o || {});
        this.auto = this.o.autoMode !== "off" ? true : false;
        this.$list = $(el);
        this.$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) {
            this.$list.parent().parent().prepend('<div class="simply-scroll-forward"></div>').prepend('<div class="simply-scroll-back"></div>');
        }
        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 {
                $(window).load(function () {
                    self.init();
                });
            }
        }
    };
    $.simplyScroll.fn = $.simplyScroll.prototype = {};
    $.simplyScroll.fn.extend = $.simplyScroll.extend = $.extend;
    $.simplyScroll.fn.extend({
        init: function () {
            try {
                this.$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.clipMax = this.$clip.height();
                    this.dimension = 'height';
                    this.moveBackClass = 'simply-scroll-btn-up';
                    this.moveForwardClass = 'simply-scroll-btn-down';
                } else {
                    this.itemMax = this.$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;
                this.$list.css(this.dimension, this.posMax + 'px');
                if (this.o.autoMode == 'loop') {
                    var addItems = Math.ceil(this.clipMax / this.itemMax);
                    this.$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);
                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);
                }
            } catch (ex) {}
        },
        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) {
                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);