//vim: et:ts=4:sw=4:sts=4:ft=js

/*
OxUI Loader

Provides function Ox.UI([options], callback) that fires when
    OxUI.css, Ox.js und jquery.js have loaded
    all images have loaded
    the document is ready
*/

(function() {

    var files = ['css/OxUI.css', 'js/Ox.js', 'js/jquery.js'],
        path = Array.prototype.slice.apply(
            document.getElementsByTagName('script')
        ).filter(function(element) {
            return /OxUI\.js$/.test(element.src);
        })[0].src.replace('js/OxUI.js', ''),
        head = document.getElementsByTagName('head')[0],
        oxUICallback = function() {},
        oxUIDefaults = {
            // 'classic', 'modern', 'console' or 'none'
            display: 'classic'
        },
        oxUIFunction = function(options, callback) {
            oxUICallback = arguments.length == 2 ? callback : options;
            oxUIOptions = arguments.length == 2 && options ? options : oxUIDefaults;
        },
        documentReady = false,
        documentReadyCallbacks = [];
    
    files.forEach(function(file, i) {
        files[i] = {
            ready: isIncluded(file),
            src: file
        };
    });

    Ox = typeof Ox != 'undefined' ? Ox : function() {};    
    Ox.UI = oxUIFunction;

    waitForDocument();
    waitForFiles();

    files.forEach(function(file) {
        var element,
            isCSS = isFileType(file.src, 'css');
        if (!file.ready) {
            element = document.createElement(isCSS ? 'link' : 'script');
            element[isCSS ? 'href' : 'src'] = path + file.src;
            element.type = isCSS ? 'text/css' : 'text/javascript';
            if (isCSS) {
                element.rel = 'stylesheet';
                waitForCSS();
            } else {
                element.onload = onload;
            }
            head.appendChild(element);
        }
        function onload() {
            file.ready = true;
            console.log(file.src, 'ready')
            if (file.src == 'js/Ox.js') {
                Ox.UI = oxUIFunction;
            }
            waitForFiles();                    
        }
        function waitForCSS() {
            try {
                element.sheet.cssRule;
                onload();
            } catch(e) {
                setTimeout(waitForCSS, 25);
            }
        }
    });

    function isFileType(src, type) {
        return new RegExp('\.' + type + '$').test(src);
    }

    function isIncluded(src) {
        var isCSS = isFileType(src);
        return Array.prototype.slice.apply(
            document.getElementsByTagName(isCSS ? 'link' : 'script')
        ).map(function(element) {
            return element[isCSS ? 'href' : 'src'] == path + src;
        }).reduce(function(prev, curr) {
            return prev || curr; 
        }, false);
    }

    function waitForDocument() {
        document.addEventListener('DOMContentLoaded', onload, false);
        function onload() {
            console.log('document ready')
            document.removeEventListener('DOMContentLoaded', onload, false);
            documentReady = true;
            bootOxUI();
        }
    }

    function waitForFiles() {
        files.map(function(file) {
            return file.ready;
        }).reduce(function(pre, cur) {
            return pre && cur;
        }) && loadOxUI();
    }

    function bootOxUI() {

        // runs when the document is ready

        var body, css, div,
            options = oxUIOptions || oxUIDefaults,
            userAgents = [
                {name: 'Chrome', url: 'http://www.google.com/chrome/'},
                {name: 'Firefox', url: 'http://www.mozilla.org/firefox/'},
                {name: 'Safari', url: 'http://www.apple.com/safari/'}
            ];

        if (options.display != 'none') {
            body = element('body');
            css = {
                position: 'absolute',
                left: 0,
                top: 0,
                right: 0,
                bottom: 0,
                margin: 'auto',
                MozUserSelect: 'none',
                WebkitUserSelect: 'none'
            };
            div = element('<div>')
                .css({
                    position: 'absolute',
                    left: 0,
                    top: 0,
                    right: 0,
                    bottom: 0,
                    background: 'rgb(' + (
                        options.display == 'classic' ? '240, 240, 240' : '16, 16, 16')
                    + ')',
                    color: 'rgb(240, 240, 240)',
                    opacity: 1,
                    zIndex: 1000
                })
                .appendTo(body);
        }

        console.log('userAgent', getUserAgent())

        getUserAgent() ? start() : stop();

        function getUserAgent() {
            var userAgent = '';
            userAgents.forEach(function(v) {
                if (navigator.userAgent.indexOf(v.name) > -1) {
                    userAgent = v.name;
                }
            });
            return userAgent;
        }

        function element(str) {
            // Generic HTML Element Object (mimics jQuery)
            return {
                0: str[0] == '<' ? 
                    document.createElement(str.substr(1, str.length - 2)) :
                    document.getElementsByTagName(str)[0],
                addClass: function(str) {
                    this[0].className = str;
                    return this;
                },
                append: function(element) {
                    this[0].appendChild(element[0]);
                    return this;
                },
                appendTo: function(element) {
                    element[0].appendChild(this[0]);
                    return this;
                },
                attr: function(obj) {
                    for (var key in obj) {
                        this[0].setAttribute(key, obj[key]);
                    }
                    return this;
                },
                css: function(obj) {
                    for (var key in obj) {
                        this[0].style[key] = obj[key];
                    }
                    return this;
                },
                html: function(str) {
                    this[0].innerHTML = str;
                    return this;
                },
                mousedown: function(fn) {
                    this[0].onmousedown = fn;
                    return this;
                }
            };
        }

        function start() {
            console.log('start')
            var image = new Image(),
                src = path + 'svg/ox.ui.classic/symbolLoading.svg';
            image.onload = function() {
                element('<img>')
                    .attr({
                        src: src,
                    })
                    .css(css)
                    .css({
                        width: '32px',
                        height: '32px'
                    })
                    .mousedown(function(e) {
                        e.preventDefault()
                    })
                    .appendTo(div);
            };
            image.src = src;
        }

        function stop() {
            console.log('stop')
            var counter = 0,
                message = 'Browser not supported, use ' + userAgents.map(function(userAgent, i) {
                    return userAgent.name + (
                        i == userAgent.length - 1 ? '.' :
                        i == userAgent.length - 2 ? ' or' : ','
                    );
                }).join(' ');
            if (options.display == 'none') {
                throw new Error(message);
            } else {
                div.addClass('error');
                if (options.display == 'console') {
                    element('<div>').html(message).appendTo(body);
                } else {
                    userAgents.forEach(function(userAgent) {
                        var image = new Image();
                        userAgent.src = path + 'png/ox.ui/browser' + userAgent.name + '128.png';
                        image.onload = function() {
                            ++counter == userAgents.length && showImages();
                        }
                        image.src = userAgent.src;
                    });
                }
            }
            function showImages() {
                var box = element('<div>')
                    .css(css)
                    .css({
                        width: (userAgents.length * 72) + 'px',
                        height: '72px'
                    })
                    .appendTo(div);
                userAgents.forEach(function(userAgent, i) {
                    var link = element('<a>')
                        .attr({
                            href: userAgent.url,
                            title: userAgent.name
                        })
                        .css({
                            position: 'absolute',
                            left: (i * 72) + 'px',
                            width: '72px',
                            height: '72px',
                        })
                        .appendTo(box);
                    element('<img>')
                        .attr({
                            src: userAgent.src
                        })
                        .css(css)
                        .css({
                            width: '64px',
                            height: '64px',
                            border: 0,
                            cursor: 'pointer'
                        })
                        .mousedown(function(e) {
                            e.preventDefault();
                        })
                        .appendTo(link);
                });
            }
        }

    }

    function loadOxUI() {

        // runs when css and js files have loaded

        documentReady && initDocument();

        $.getJSON(path + 'json/OxUI.json', function(data) {

            var $head = $('head'),
                promises = documentReady ? [] : [waitForDocument()];

            // fixme: find a better way to not wait for flags
            data = data.filter(function(image) {
                return !Ox.startsWith(image, 'svg/ox.map/');
            });
            data.forEach(function(src) {
                promises.push(loadFile(src));
            });
            $.when.apply(null, promises)
                .then(function() {
                    var $div, error = $('.error').length;
                    if (!error) {
                        $div = $('div');
                        $('img').remove();
                        $div.animate({
                            opacity: 0
                        }, 1000, function() {
                            $div.remove();
                        });
                        oxUICallback();
                    }
                })
                .fail(function() {
                    throw new Error('File not found.');
                });

            function loadFile(src) {
                var dfd = new $.Deferred(),
                    isJS = isFileType(src, 'js'),
                    element = isJS ? document.createElement('script') : new Image();
                element.onload = dfd.resolve;
                element.src = path + src;
                if (isJS) {
                    element.type = 'text/javascript';
                    head.appendChild(element)
                } else {
                    // need to keep a reference to keep image in cache
                    Ox.UI.IMAGE_CACHE.push(src);
                }
                return dfd.promise();
            }

            function waitForDocument() {
                var dfd = new $.Deferred();
                $(function() {
                    documentReady = true;
                    initDocument()
                    dfd.resolve();
                });    
                return dfd.promise();
            }

        });

        function initDocument() {
            Ox.UI.$body = $('body');
            Ox.UI.$document = $(document);
            Ox.UI.$head = $('head');
            Ox.UI.$window = $(window);
            documentReadyCallbacks.forEach(function(callback) {
                callback();
            });
        }

        Ox.UI.ready = function(callback) {
            if (!documentReady) {
                documentReadyCallbacks.push(callback);
            } else {
                callback();
            }
        };

        Ox.UI.elements = {};
        Ox.UI.DEFAULT_THEME = 'classic';
        Ox.UI.DIMENSIONS = {
            horizontal: ['width', 'height'],
            vertical: ['height', 'width']
        };
        Ox.UI.EDGES = {
            horizontal: ['left', 'right', 'top', 'bottom'],
            vertical: ['top', 'bottom', 'left', 'right']
        };
        Ox.UI.getImagePath = function(filename) {
            // fixme: not the best idea to do this here
            if (filename == 'symbolPlay.svg') {
                filename = 'symbolRight.svg';
            }
            return Ox.UI.PATH + filename.split('.').pop() +
                '/ox.ui.' + Ox.UI.theme() + '/' + filename;
        };
        Ox.UI.IMAGE_CACHE = [];
        Ox.UI.PATH = $('script[src*="OxUI.js"]')
            .attr('src').replace('js/OxUI.js', '');
        Ox.UI.SCROLLBAR_SIZE = $.browser.mozilla ? 16 : 12;
        // fixme: the follwing should be deprecated
        Ox.UI.theme = function() {
            var theme;
            Ox.forEach(Ox.UI.$body.attr('class').split(' '), function(v) {
                if (Ox.startsWith(v, 'OxTheme')) {
                    theme = v.replace('OxTheme', '').toLowerCase();
                    return false;
                }
            });
            return theme || Ox.UI.DEFAULT_THEME; // fixme: shouldn't be neccessary
        };
        Ox.UI.getBarSize = function(size) {
            var sizes = {
                small: 20,
                medium: 24,
                large: 28
            };
            return sizes[size];
        };
        Ox.UI.symbols = {
            alt: '\u2325',
            apple: '\uF8FF',
            arrow_down: '\u2193',
            arrow_left: '\u2190',
            arrow_right: '\u2192',
            arrow_up: '\u2191',
            backspace: '\u232B',
            backup: '\u2707',
            ballot: '\u2717',
            black_star: '\u2605',
            burn: '\u2622',
            caps_lock: '\u21EA',
            check: '\u2713',
            //clear: '\u2327',
            clear: '\u00D7',
            click: '\uF803',
            close: '\u2715',
            command: '\u2318',
            control: '\u2303',
            cut: '\u2702',
            'delete': '\u2326',
            diamond: '\u25C6',
            edit: '\uF802',
            eject: '\u23CF',
            escape: '\u238B',
            end: '\u2198',
            enter: '\u2324',
            fly: '\u2708',
            gear: '\u2699',
            home: '\u2196',
            info: '\u24D8',
            navigate: '\u2388',
            option: '\u2387',
            page_up: '\u21DE',
            page_down: '\u21DF',
            redo: '\u21BA',
            'return': '\u21A9',
            //select: '\u21D5',
            select: '\u25BE',
            shift: '\u21E7',
            sound: '\u266B',
            space: '\u2423',
            tab: '\u21E5',
            trash: '\u267A',
            triangle_down: '\u25BC',
            triangle_left: '\u25C0',
            triangle_right: '\u25BA',
            triangle_up: '\u25B2',
            undo: '\u21BB',
            voltage: '\u26A1',
            warning: '\u26A0',
            white_star: '\u2606'
        };

    }

}());