preceptorjs/taxi

module.exports = {

    load: function () {

        function versionInfo () {
            return {
                major: 1,
                minor: 0
            };
        }

        function deviceInfo () {
            return {
                userAgent: window.navigator.userAgent,

                app: {
                    codeName: window.navigator.appCodeName,
                    name: window.navigator.appName,
                    version: window.navigator.appVersion,
                    buildId: window.navigator.buildID
                },

                languages: window.navigator.languages || [window.navigator.language],

                product: {
                    name: window.navigator.product,
                    sub: window.navigator.productSub
                },
                vendor: {
                    name: window.navigator.vendor,
                    sub: window.navigator.vendorSub
                },

                screen: {
                    pixelRatio: window.devicePixelRatio || 1,
                    availableWidth: window.screen.availWidth,
                    availableHeight: window.screen.availHeight,
                    colorDepth: window.screen.colorDepth,
                    width: window.screen.width,
                    height: window.screen.height,
                    fullScreen: window.fullScreen
                }
            }
        }

        function documentInfo () {
            var de = document.documentElement,
                body = document.body,
                result = {};

            result.title = document.title;
            result.url = window.location + '';
            result.referrer = document.referrer;

            result.size = {
                width: Math.max(body.scrollWidth, body.offsetWidth, de.clientWidth, de.scrollWidth, de.offsetWidth),
                height: Math.max(body.scrollHeight, body.offsetHeight, de.clientHeight, de.scrollHeight, de.offsetHeight)
            }
        }

        function viewPortInfo () {
            var el = document.createElement('div'),
                de = document.documentElement,
                body = document.body,
                result = {};

            // Get current scroll-position
            result.x = window.pageXOffset || body.scrollLeft || de.scrollLeft;
            result.y = window.pageYOffset || body.scrollTop || de.scrollTop;

            // Get current view-port size
            el.style.position = "fixed";
            el.style.top = 0;
            el.style.left = 0;
            el.style.bottom = 0;
            el.style.right = 0;
            de.insertBefore(el, de.firstChild);
            result.width = el.offsetWidth;
            result.height = el.offsetHeight;
            de.removeChild(el);

            return result;
        }

        function domInfo () {

            var capturedTags = ["A", "SPAN", "OL", "UL", "LI", "HEADER", "FOOTER", "NAV", "ARTICLE", "SECTION", "ASIDE", "DIV", "APPLET", "CANVAS", "VIDEO", "TABLE", "DETAILS", "SUMMARY", "IFRAME", "MENU", "MAIN", "FIGURE", "FIELDSET"];

            function loadDOMNode (inputNode, parentNode) {

                var nodes, length, offset, newNode;

                if (capturedTags.indexOf(inputNode.tagName) !== -1) {

                    newNode = {};
                    newNode.id = (inputNode.id && inputNode.id.length > 0) ? inputNode.id : null;
                    newNode.tagName = inputNode.tagName;
                    newNode.classes = (inputNode.className && inputNode.className.length > 0) ? inputNode.className.split(/\s/) : [];
                    newNode.width = inputNode.offsetWidth;
                    newNode.height = inputNode.offsetHeight;

                    offset = absoluteOffset(inputNode);
                    newNode.x = offset.x;
                    newNode.y = offset.y;

                    newNode.nodes = [];

                    if ((newNode.width > 0) && (newNode.height > 0)) {
                        parentNode.nodes.push(newNode);
                        parentNode = newNode;
                    }
                }

                nodes = inputNode.children;
                length = inputNode.childElementCount;

                if (nodes && length) {
                    for (var i = 0; i < length; i++) {
                        loadDOMNode(nodes[i], parentNode);
                    }
                }

                return parentNode;
            }

            function absoluteOffset (element) {

                var x = 0, y = 0;

                do {
                    x += element.offsetLeft || 0;
                    y += element.offsetTop || 0;
                    element = element.offsetParent;
                } while (element);

                return {
                    x: x, y: y
                };
            }

            var node = {nodes:[]};

            loadDOMNode(document.body, node);

            return node;
        }

        return JSON.stringify({
            version: versionInfo(),
            device: deviceInfo(),
            document: documentInfo(),
            viewPort: viewPortInfo(),
            screenshot: {
                stitched: false,
                x: 0,
                y: 0,
                width: null,
                height: null
            },
            dom: domInfo()
        });
    }
};