/*
* 	 imBookFlip - a JQuery Plugin
* 	 @author Les Green
* 	 Copyright (C) 2009 Intriguing Minds, Inc.
*   Version 0.6
* 
*   This program is free software: you can redistribute it and/or modify
*   it under the terms of the GNU General Public License as published by
*   the Free Software Foundation, either version 3 of the License, or
*   (at your option) any later version.
*
*   This program is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*   GNU General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*   
*   original Javascript BookFlip concept - http://www.coastworx.com/bookflip.php
*   soundManager - Scott Schiller http://www.schillmania.com/projects/soundmanager2/
*
*   Demo and Documentation can be found at:   
*   http://www.grasshopperpebbles.com
*   
*/

; (function($) {
    $.fn.extend({
        imBookFlip: function(options) {
            opts = $.extend({}, $.bookFlip.defaults, options);
            return this.each(function() {
                new $.bookFlip(this, opts);
            });
        }
    });

    $.bookFlip = function(obj, opts) {
        var $this = $(obj);
        var numPages = 0;
        var leftStart = 0, rightStart = 1;
        var autoPage = 0;
        var page, book, bW, pageW, pageH, bookOpenW = '';

        if (opts.sound_manager) {
            loadAudio();
        }

        if (opts.iframe.src) {
            loadIFrame();
        } else {
            page = $('.' + opts.page_class)[0];
            init();
        }

        function loadIFrame() {
            var iframe = $this.append($('<iframe src="' + opts.iframe.src + '" id="bookFlipIframe" name="bookFlipIframe"></iframe>').css({ "width": $this.width(), "height": $this.height(), "border": "0px", "overflow": "hidden" }));
            $('#bookFlipIframe').load(function() {
                book = $('#bookFlipIframe').contents().find('#' + opts.iframe.book);
                page = $('#bookFlipIframe').contents().find('.' + opts.page_class)[0];
                init();
            });
        };

        function init() {
            bW = parseInt($(page).css('borderLeftWidth')) + parseInt($(page).css('borderRightWidth'));
            pageW = parseInt($(page).css('width')) + bW;
            pageH = parseInt($(page).css('height')) + bW;
            bookOpenW = pageW * 2;

            //var showBinder=false; //change to false for no binder
            //var binderImage = "parchmentring2.gif"; //location of center binder
            //var binderWidth = 20; //width of center binder image		

            if (opts.numPixels > 100) { opts.numPixels = 100; };
            createPages();
        };

        function loadAudio() {
            var ld = (opts.autoFlip != 'click');
            var dbg = false;
            if (opts.sound_manager.debug) {
                dbg = opts.sound_manager.debug;
            }
            soundManager.url = opts.sound_manager.swf_loc;
            soundManager.debugMode = dbg;
            soundManager.onload = function() {
                // soundManager is initialised, ready to use. Create a sound for this demo page.
                soundManager.createSound({
                    id: 'bookAudio',
                    url: opts.sound_manager.audio_loc,
                    autoLoad: true,
                    autoPlay: ld
                });
            }
        };

        function createPages() {
            var pages;
            if (opts.iframe.src) {
                $this = $(book);
                pages = $this.find(' > div');
            } else {
                var bk = $this.attr('id');
                pages = $('#' + bk + ' > div');
            }
            $this.css({ 'width': (bookOpenW + 'px'), 'height': pageH + 'px', 'zIndex': 0 });
            $(pages).each(function(i) {
                numPages++;
                var orig = $(this).clone();
                var div = $('<div></div>').attr({ 'id': 'pageNum' + i, 'class': opts.page_class }).css({ 'zIndex': 20 - i, 'border': 'none', 'left': pageW + 'px', 'width': pageW + 'px', 'height': pageH + 'px' });
                $(this).replaceWith(div);
                $(orig).attr('id', 'pageFlip' + i);
                /*if(!number_check(i)){
                if(document.all){
                $(orig).css('filter', 'progid:DXImageTransform.Microsoft.Alpha(Opacity=100, FinishOpacity=30, Style=1, StartX=80, FinishX=100, StartY=0, FinishY=0)');
                }else{
                var pngDiv = $('<div></div>').css({'position': 'absolute', 'left':pWidth-80+'px', 'top':'0px', 'width':80+'px', 'height': pHeight+'px', 'background': 'transparent url(bookflip/black_gradient.png) top right repeat-y'}).appendTo($(orig));
                }			
                }*/
                $(div).append($(orig));
                if (opts.allowPageClick) {
                    $(orig).click(function() {
                        if (number_check(i)) {
                            soundCheck();
                            nextPage();
                        } else {
                            prevPage();
                        }
                    });
                }
            });
            $this.css('display', 'block');
            if (opts.autoFlip == 'auto') {
                doAutoFlip();
            }
        };

        function doAutoFlip() {
            if (rightStart < numPages) {
                autoPage = setTimeout(nextPage, opts.autoFlipSpeed);
            } else {
                clearTimeout(autoPage);
            }
        };

        function soundCheck() {
            if ((opts.sound_manager) && (rightStart == 1)) {
                if (opts.autoFlip == 'click') {
                    soundManager.play('bookAudio');
                }
            }
        };

        function number_check(value) {
            //  returns true if value is even, false if value is odd
            return (1 - (value % 2));
        };

        function nextPage() {
            var page = (opts.iframe.src) ? $this.find("#pageNum" + rightStart) : $("#pageNum" + rightStart);
            var lpage = (opts.iframe.src) ? $this.find("#pageNum" + leftStart) : $("#pageNum" + leftStart);
            $(page).css({ 'width': '0px', 'left': bookOpenW + 'px', 'zIndex': 99 });
            $(page).animate({ 'left': 2 + 'px', 'width': pageW + 'px' }, 'slow', function() {
                $(lpage).css({ 'width': '0px' });
                var z = $(this).css('zIndex');
                $(this).css({ 'left': '0px', 'width': pageW + 'px', 'zIndex': z - 99 });
                $(lpage).css({ 'left': '', 'right': '0px' });
                $(this).css({ 'left': '', 'right': '0px' });
                leftStart = leftStart + 2;
                rightStart = rightStart + 2;
                if (opts.autoFlip != 'off') {
                    doAutoFlip();
                }
            });
        };

        function prevPage() {
            leftStart = leftStart - 2;
            rightStart = rightStart - 2;
            var page = (opts.iframe.src) ? $this.find("#pageNum" + leftStart) : $("#pageNum" + leftStart);
            var rpage = (opts.iframe.src) ? $this.find("#pageNum" + rightStart) : $("#pageNum" + rightStart);
            var pFlipL = (opts.iframe.src) ? $this.find("#pageFlip" + leftStart) : $("#pageFlip" + leftStart);
            var pFlipR = (opts.iframe.src) ? $this.find("#pageFlip" + rightStart) : $("#pageFlip" + rightStart);
            $(page).css({ 'width': '0px', 'left': '0px' });
            $(pFlipR).css({ 'left': '', 'right': '0px' });
            $(page).animate({ 'left': pageW + 'px', 'width': pageW + 'px' }, 'slow', function() {
                $(rpage).css({ 'width': '0px' });
                $(pFlipR).css({ 'left': '0px' });
                $(pFlipL).css({ 'left': '0px' });
            });
        };

    };

    $.bookFlip.defaults = {
        allowPageClick: true,
        autoFlip: 'off', //auto, click
        autoFlipSpeed: 7000,
        numPixels: 20, //number of pixels to move per frame, more is faster but less smooth
        pSpeed: '20', //page speed, 20 is best for Opera browser. Less is faster
        page_class: '',
        sound_manager: '', // {swf_loc: 'soundmanager/soundmanager2.swf', audio_loc: '', debug: false}
        iframe: '' //{src: 'test_bookflip3_iframe.html', book: 'myBook'}
    };
})(jQuery);