// ==UserScript==
// @name u.js
// @namespace http://zarjay.net/
// @description Utility functions for browser console ninjas
// @include *
// @version 0.23
// ==/UserScript==

exec(function() {
        // Current version of u.js
    var VERSION = '0.22',

        // Predefined resources to be included via u.include(name)
        RESOURCES = {

            // resource: { css: [], js: [], script: [] }
            
            // Design - http://www.sprymedia.co.uk/article/Design
            // Grid layout, measurement, and alignment bookmarklet
            design: {
                js: ['http://www.sprymedia.co.uk/design/design/media/js/design-loader.js']
            },

            // DOM Monster - http://mir.aculo.us/dom-monster/
            // Analyzes DOM and gives performance tips
            'dom-monster': {
                js: ['//mir.aculo.us/dom-monster/dommonster.js']
            },

            // jQuery library - http://jquery.com/
            // DOM manipulation, event handling, Ajax, etc.
            jquery: {
                js: ['//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js']
            },

            // jQuery UI - http://jqueryui.com/
            // UI/effects library
            'jquery-ui': {
                css: ['//ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/jquery-ui.css'],
                js: ['//ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js']
            },

            // Katamari Hack - http://kathack.com/
            // Turns a webpage into a game of Katamari Damacy. Use your katamari ball to pick up DOM elements.
            katamari: {
                js: ['//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js', 'http://kathack.com/js/kh.js']
            },

            // Kickass - https://kickassapp.com/
            // Turn a webpage into a game of Asteroids. Use your ship to destroy DOM elements.
            kickass: {
                js: ['//hi.kickassapp.com/kickass.js']
            },

            // Lo-Dash - http://lodash.com/
            // Underscore alternative (utility library)
            lodash: {
                js: ['//cdnjs.cloudflare.com/ajax/libs/lodash.js/1.0.0-rc.3/lodash.min.js']
            },

            // Markup - http://markup.io
            // Draw on a webpage and share with others
            markup: {
                script: ["(function(){window.add_js=function(s){var k=(document.getElementsByTagName('head')[0]||document.body).appendChild(document.createElement('script'));k.src=s;k.type='text/javascript';k.markup='ea33cdc7-73dd-11e2-9673-fac11f1adc9e'};window.MarkUp=window.MarkUp||{};add_js('http://api.markup.io/bootstrap.js?v=1&'+(+(new Date)))})();"]
            },

            // Moment.js - http://momentjs.com/
            // Date library
            moment: {
                js: ['//cdnjs.cloudflare.com/ajax/libs/datejs/1.0/date.min.js']
            },

            // Raphael
            // SVG library
            raphael: {
                js: ['//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js']
            },

            // Stats - https://github.com/mrdoob/stats.js/
            // FPS counter
            stats: {
                js: ['https://github.com/mrdoob/stats.js/raw/master/build/stats.min.js'],
                script: ['var interval=setInterval(function(){if(typeof Stats==\'function\'){clearInterval(interval);var stats=new Stats();stats.domElement.style.position=\'fixed\';stats.domElement.style.left=\'0px\';stats.domElement.style.top=\'0px\';stats.domElement.style.zIndex=\'10000\';document.body.appendChild(stats.domElement);setInterval(function(){stats.update();},1000/60);}},100);']
            },

            // Statsy Bookmarklet - http://www.phpied.com/statsy-more-data-points-for-markup-quality/
            // Displays some DOM statistics
            statsy: {
                js: ['http://phpied.com/files/bookmarklets/somestats.js']
            },

            // Underscore - http://underscorejs.org/
            // Utility library
            underscore: {
                js: ['//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.4/underscore-min.js']
            },

            // What Font Bookmarklet - http://chengyinliu.com/whatfont.html
            // Identifies fonts
            whatfont: {
                js: ['http://chengyinliu.com/wf.js']
            }
        },

        // setInterval(function() { u.query('img').effect('rotate'); }, 3000);
        // u.query('img').effect('spin', 'random'); // They all spin at the same time
        // u.query('img').each(function(element) { element.effect('spin', 'random', Math.random() + 0.2); } ); // They all spin at different times
        // u.query('img').each(function(element) { element.effect('tilt', 5, Math.random() * (5 - 0.4 + 1) + 0.4); }); // They all spin at different times
        EFFECTS = {
            // u.effect('flip', 'z')
            flip: function(axis, speed) {
                // Default to flip on y-axis if undefined
                axis = axis || 'y';
                // If undefined, default to 3s
                // If number, assume seconds and add 's' unit
                speed = speed || '3s';
                if (!isNaN(speed)) speed += 's';

                var transform = 'rotate' + axis.toUpperCase();

                this.css('-webkit-transition', 'none');
                this.css('-webkit-transform', transform + '(0deg)');

                // Wait a bit before updating the same CSS properties
                setTimeout(function() {
                    this.css('-webkit-transition', '-webkit-transform ' + speed);
                    this.css('-webkit-transform', transform + '(180deg)');
                }.bind(this), 0);
            },

            // u.effect('rotate', '60deg', '4s')
            rotate: function(angle, speed) {
                // If number, add 'deg' unit
                // If undefined, default to random angle between -1080 and 1080
                angle = !isNaN(angle) && angle !== null ? angle + 'deg' : angle ? angle : ( Math.floor( Math.random() * 1081 ) - 1080 + 'deg' );
                // If undefined, default to 2s
                // If number, assume seconds and add 's' unit
                speed = speed || '2s';
                if (!isNaN(speed)) speed += 's';

                this.css('-webkit-transition', '-webkit-transform ' + speed);
                this.css('-webkit-transform', 'rotate(' + angle + ')');
            },

            // u.effect('spin', 'random')
            spin: function(option, speed) {
                var speedParts = /(\d+\.?\d*)(\D*)/.exec(speed),
                    speedMs = speedParts[2] !== 'ms' ? speedParts[1] * 1000 : speedParts[1],
                    angleIncrement = (option === 'backwards') ? -360 : (option === 'random') ? undefined : 360,
                    angle = angleIncrement;
                    fn = function() {
                        this.effect('rotate', angle, speed);
                        angle += angleIncrement;
                    },
                    id = setInterval(fn.bind(this), speedMs);
            },
            // u.effect('tilt', 5);
            // u.effect('tile', '5deg');
            tilt: function(range, speed) {
                // If deg value (e.g., '5deg'), parse out number
                // If undefined, default to 5
                range = parseInt(range || 5, 10);
                // If undefined, default to 3s
                // If number, assume seconds and add 's' unit
                speed = speed || '1s';
                if (!isNaN(speed)) speed += 's';

                var angleStart = 0 - range,
                    angleEnd = 0 + range;

                var animation = addAnimation({
                    '0%': '-webkit-transform:rotate(' + angleStart + 'deg);',
                    '50%': '-webkit-transform:rotate(' + angleEnd + 'deg);',
                    '100%': '-webkit-transform:rotate(' + angleStart + 'deg);'
                });

                this.css('-webkit-animation', animation + ' infinite ' + speed);
            }
        },

        // Converts array-like objects to arrays
        slice = Function.prototype.call.bind(Array.prototype.slice),

        // Copies properties from the second object into the first object
        extend = function(dest, src) {
            for (var prop in src) dest[prop] = src[prop];
            return dest;
        },

        // Adds a <style> to the page
        addStyle = function(css) {
            style = document.createElement('style');
            style.textContent = css;
            document.head.appendChild(style);
        },

        // Adds a <link> for the specified URL
        addCSS = function(url) {
            var link = document.createElement('link');
            link.rel = 'stylesheet';
            link.href = url;
            document.head.appendChild(link);

            console.log('Loaded ' + url);
        },

        // Adds a <script> for the specified URL
        addJS = function(url) {
            var script = document.createElement('script');
            script.src = url;
            script.async = false;
            document.head.appendChild(script);

            console.log('Loaded ' + url);
        },

        // Adds a <script> for the specified JavaScript
        addScript = function(fn, isImmediate) {
            if (isImmediate === undefined) isImmediate = false;
            var script = document.createElement('script');
            script.textContent = isImmediate ? '(' + fn + ')();' : fn;
            document.head.appendChild(script);
        },

        // Adds a CSS animation style
        addAnimation = function(keyframes) {
            this.counter = this.counter || 0;

            var animationName = 'u-animation-' + this.counter++;
            var style = '@-webkit-keyframes ' + animationName + ' { ';
            for (var name in keyframes) {
                style += name + ' { ' + keyframes[name] + ' } ';
            }
            
            style += '}';

            addStyle(style);
            return animationName;
        },

        Collection = {

            // Sets CSS property for elements
            // Or gets the CSS property value of first element
            css: function(property, value) {
                if (value === undefined && this.length) return window.getComputedStyle(this[0])[property];
                this.forEach(function(element) {
                    element.style[property] = value;
                });
            },

            each: function(callback) {
                this.forEach(function(element) {
                    callback(extend([element], Collection));
                });
            },

            // Make elements editable
            edit: function(isEditable) {
                this.forEach(function(element) {
                    if (isEditable === undefined) isEditable = true;
                    element.contentEditable = isEditable;
                });
            },

            // Applies a CSS effect
            effect: function(effect, value, speed) {
                if (effect === undefined) return Object.keys(EFFECTS);
                if (effect in EFFECTS) EFFECTS[effect].call(this, value, speed);
            },

            // Add HTML at the specified position
            insert: function(position, html) {
                var positions = {
                    append: 'beforeend',
                    prepend: 'afterbegin',
                    before: 'beforebegin',
                    after: 'afterend'
                };

                this.forEach(function(element) {
                    element.insertAdjacentHTML(positions[position] || position, html);
                });
            },

            // Intercept events by executing first (during the capture phase) and stopping propagation
            // Useful for sites that prevent/manipulate text selection, right-click, etc.
            intercept: function() {
                var events = ['keyup', 'keydown', 'keypress', 'mouseup', 'mousedown', 'selectstart', 'contextmenu', 'copy'],
                    stopEvents = function(e) { e.stopPropagation(); };

                this.forEach(function(element) {
                    events.forEach(function(e) {
                        element.addEventListener(e, stopEvents, true);
                    });
                });
            },

            // Gets the parent of each element
            parent: function() {
                return extend(this.map(function(element) {
                    return element.parentNode;
                }), Collection);
            },

            // Replaces HTML based on the given regex
            // If a string is used instead of a regex, it's converted to a global regex
            replace: function(regex, html) {
                this.forEach(function(element) {
                    if (!(regex instanceof RegExp)) regex = new RegExp(regex, 'g');
                    element.innerHTML = element.innerHTML.replace(regex, html);
                });

            },

            // Combine element values
            // Optionally specify functions to filter out selections,
            // remap values, or change how the values are summed up
            sum: function(filter, map, reduce) {
                filter = filter || function() { return true; };
                map = map || function(element) { return +element.textContent.replace(/[$,%]/g, ''); };
                reduce = reduce || function(a, b) { return a + b; };
                return this.filter(filter).map(map).reduce(reduce);
            }
        },

        body = extend([document.body], Collection);


    // u.js
    var u = {

        // Current version of u.js
        _VERSION: VERSION,

        // Get/set a CSS property on <body>
        // u.css(property)
        // u.css(property, value)
        css: Collection.css.bind(body),

        // Makes everything editable.
        // u.edit() or u.edit(true) - Turns on editing
        // u.edit(false) - Turns off editing
        edit: Collection.edit.bind(body),

        // u.effect(property, value, speed)
        // u.effect(effect, value, speed)
        effect: Collection.effect.bind(body),

        // Include a CSS file, JS file, or predefined resource
        // u.include(url) - Adds CSS or JS file onto the page
        // u.include(url, type) - Adds CSS or JS file onto the page (specifying type in second param)
        // u.include(resource) - Adds resource onto the page
        // u.include() - Lists available resources to include
        include: function(resource, type) {
            if (resource === undefined) return Object.keys(RESOURCES);

            if (resource in RESOURCES) {

                var r = RESOURCES[resource];
                if (r.css) for (var j = 0; j < r.css.length; ++j) addCSS(r.css[j]);
                if (r.js) for (var k = 0; k < r.js.length; ++k) addJS(r.js[k]);
                if (r.script) for (var l = 0; l < r.script.length; ++l) addScript(r.script[l]);

            } else {

                type = (type || url.split('.').pop()).toLowerCase();

                if (type === 'css') {
                    addCSS(url);
                } else if (type === 'js') {
                    addJS(url);
                } else {
                    throw new Error('Could not load ' + url);
                }

            }
        },

        // Insert HTML in <body> at the specified position
        // u.insert(position, html)
        insert: Collection.insert.bind(body),

        // Stop events from manipulating/preventing user input
        // u.intercept()
        intercept: Collection.intercept.bind(body),

        // Returns u.js-powered array of elements
        // Shortcut for document.querySelectorAll()
        // u.query(selector)
        query: function(selector) {
            return extend(slice(document.querySelectorAll(selector)), Collection);
        },

        // u.ready();
        // u.ready(fn);
        // u.ready(null);
        ready: function(fn) {
            var key = 'u.ready';

            if (fn === undefined) {
                fn = this.store(key);
                if (fn) addScript(fn, true);
            } else {
                this.store(key, fn);
            }
        },

        // Replace HTML in <body> usng a string or regex
        // u.replace(regex, html)
        replace: Collection.replace.bind(body),

        // Store and retrieve data in localStorage (including functions)
        // store(key, value) - Stores value in localStorage under key
        // store(key) - Gets value of key in localStorage
        // store() - List keys stored in localStorage
        store: function(key, value) {
            if (key === undefined) return Object.keys(localStorage);

            if (value === undefined) {

                value = localStorage[key];

                // Return immediately if falsey
                if (!value || value === 'undefined') return value;

                value = value && JSON.parse(value);

                if (value && value.indexOf && value.indexOf('function') === 0) value = eval('(' + value + ')');

                return value;

            } else {
                if (typeof value === 'function') value = value.toString();
                localStorage[key] = JSON.stringify(value);
            }
        }
    };


    /* Init */

    var loadu = function(u, names) {
        for (var i = 0; i < names.length; ++i) {
            var name = names[i];

            if (name in window) continue;

            window[name] = u;
            console.log('Loaded u.js as global variable ' + name);

            return;
        }

        console.warn('Could not load u.js due to variable conflicts.');
    };

    loadu(u, ['u', 'u.js', 'zarjay.net/u.js']);

    u.ready();

});

// Executes function in global scope (so it becomes available outside of userscript)
function exec(fn) {
    var script = document.createElement('script');
    script.textContent = '(' + fn + ')();';
    document.head.appendChild(script);
}