/*
Copyright (c) 2007, iUI Project Members
See LICENSE.txt for licensing terms
*/


(function() {

    var slideSpeed = 20;
    var slideInterval = 0;

    var currentPage = null;
    var currentDialog = null;
    var currentWidth = 0;
    var currentHash = location.hash;
    var hashPrefix = "#_";
    var pageHistory = [];
    var newPageCount = 0;
    var checkTimer;

    // *************************************************************************************************

    window.iui =
{
    showPage: function(page, backwards) {
        if (page) {
            if (currentDialog) {
                currentDialog.removeAttribute("selected");
                currentDialog = null;
            }

            if (hasClass(page, "dialog"))
                showDialog(page);
            else {
                var fromPage = currentPage;
                currentPage = page;

                if (fromPage)
                    setTimeout(slidePages, 0, fromPage, page, backwards);
                else
                    updatePage(page, fromPage);
            }
        }
    },

    showPageById: function(pageId) {
        var page = $(pageId);
        if (page) {
            var index = pageHistory.indexOf(pageId);
            var backwards = index != -1;
            if (backwards)
                pageHistory.splice(index, pageHistory.length);

            iui.showPage(page, backwards);
        }
    },

    showPageByHref: function(href, args, method, replace, cb) {
        var req = new XMLHttpRequest();

        req.onerror = function() {
            if (cb)
                cb(false);
        };

        req.onreadystatechange = function() {
            if (req.readyState == 4) {
                var scripts = [];
                var scriptsToRun = 0;
                if (replace) {
                    replaceElementWithSource(replace, req.responseText);
                }
                else {
                    var frag = document.createElement("div");
                    frag.innerHTML = req.responseText;
                    var scripts_els = frag.getElementsByTagName('script');
                    for (var i = 0, l = scripts_els.length; i < l; i++) {
                        if (scripts_els[i].src.length > 0) {
                        }
                        else {

                            scripts.push(scripts_els[i].innerText);
                            scriptsToRun++;
                        }
                    }
                    iui.insertPages(frag.childNodes);
                }
                if (cb) {
                    setTimeout(function() {
                        for (var i = 0, l = scriptsToRun; i < l; i++) {

                            window.eval(scripts[i]);

                        }
                       
                        cb();
                    }, 100, true);
                }
                else {
                    for (var i = 0, l = scriptsToRun; i < l; i++) {
                        window.eval(scripts[i]);
                    }                    
                }

            }
        };
       
        if (args) {
            req.open(method || "GET", href, true);
            req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            req.setRequestHeader("Content-Length", args.length);
            req.send(args.join("&"));
        }
        else {
            req.open(method || "GET", href, true);
            req.send(null);
        }
    },

    insertPages: function(nodes) {
        var targetPage;
        for (var i = 0; i < nodes.length; ++i) {
            var child = nodes[i];
            if (child.nodeType == 1) {
                if (!child.id)
                    child.id = "__" + (++newPageCount) + "__";

                var clone = $(child.id);
                if (clone)
                    clone.parentNode.replaceChild(child, clone);
                else
                    document.body.appendChild(child);

                if (child.getAttribute("selected") == "true" || !targetPage)
                    targetPage = child;

                --i;
            }
        }

        if (targetPage)
            iui.showPage(targetPage);
    },

    getSelectedPage: function() {
        for (var child = document.body.firstChild; child; child = child.nextSibling) {
            if (child.nodeType == 1 && child.getAttribute("selected") == "true")
                return child;
        }
    }
};

    // *************************************************************************************************

    addEventListener("load", function(event) {
        var page = iui.getSelectedPage();
        if (page)
            iui.showPage(page);

        setTimeout(preloadImages, 0);
        setTimeout(checkOrientAndLocation, 0);
        checkTimer = setInterval(checkOrientAndLocation, 300);
    }, false);

    addEventListener("click", function(event) {

        var link = findParent(event.target, "a");


        if (link) {
            function unselect() { link.removeAttribute("selected"); }

            if (link.href && link.hash && link.hash != "#") {
                link.setAttribute("selected", "true");
                iui.showPage($(link.hash.substr(1)));
                setTimeout(unselect, 500);
            }
            else if (link == $("backButton"))
                history.back();
            else if (link.getAttribute("type") == "submit")
                submitForm(findParent(link, "form"));
            else if (link.getAttribute("type") == "cancel")
                cancelDialog(findParent(link, "form"));
            else if (link.target == "_replace") {
                link.setAttribute("selected", "progress");
                iui.showPageByHref(link.href, null, null, link, unselect);
            }
            else if (link.target == "_self" && link.href == window.location.href.substring(0, link.href.length)) {
                location.reload();
            }
            else if (!link.target) {
                link.setAttribute("selected", "progress");
                iui.showPageByHref(link.href, null, null, null, unselect);
            }
            else {
                return;
            }
            event.preventDefault();
        }
    }, true);

    addEventListener("click", function(event) {

        var div = findParent(event.target, "div");
        if (div && hasClass(div, "toggle")) {
            div.setAttribute("toggled", div.getAttribute("toggled") != "true");
            event.preventDefault();
        }

    }, true);

    function checkOrientAndLocation() {
        if (window.innerWidth != currentWidth) {
            currentWidth = window.innerWidth;
            var orient = currentWidth == 320 ? "profile" : "landscape";
            document.body.setAttribute("orient", orient);
            setTimeout(scrollTo, 100, 0, 1);
        }

        if (location.hash != currentHash) {
            var pageId = location.hash.substr(hashPrefix.length)
            iui.showPageById(pageId);
        }
    }

    function showDialog(page) {
        currentDialog = page;
        page.setAttribute("selected", "true");

        if (hasClass(page, "dialog") && !page.target)
            showForm(page);
    }

    function showForm(form) {
        form.onsubmit = function(event) {
            event.preventDefault();
            submitForm(form);
        };

        form.onclick = function(event) {
            if (event.target == form && hasClass(form, "dialog"))
                cancelDialog(form);
        };
    }

    function cancelDialog(form) {
        form.removeAttribute("selected");
    }

    function updatePage(page, fromPage) {
        if (!page.id)
            page.id = "__" + (++newPageCount) + "__";

        location.href = currentHash = hashPrefix + page.id;
        pageHistory.push(page.id);

        var pageTitle = $("pageTitle");
        if (page.title)
            pageTitle.innerHTML = page.title;

        if (page.localName.toLowerCase() == "form" && !page.target)
            showForm(page);

        var backButton = $("backButton");
        if (backButton) {
            var prevPage = $(pageHistory[pageHistory.length - 2]);
            if (prevPage && !page.getAttribute("hideBackButton")) {
                backButton.style.display = "inline";
                backButton.innerHTML = prevPage.title ? prevPage.title : "Back";
            }
            else
                backButton.style.display = "none";
        }
    }

    function slidePages(fromPage, toPage, backwards) {
        var axis = (backwards ? fromPage : toPage).getAttribute("axis");
        if (axis == "y")
            (backwards ? fromPage : toPage).style.top = "100%";
        else
            toPage.style.left = "100%";

        toPage.setAttribute("selected", "true");
        scrollTo(0, 1);
        clearInterval(checkTimer);

        var percent = 100;
        slide();
        var timer = setInterval(slide, slideInterval);

        function slide() {
            percent -= slideSpeed;
            if (percent <= 0) {
                percent = 0;
                if (!hasClass(toPage, "dialog"))
                    fromPage.removeAttribute("selected");
                clearInterval(timer);
                checkTimer = setInterval(checkOrientAndLocation, 300);
                setTimeout(updatePage, 0, toPage, fromPage);
            }

            if (axis == "y") {
                backwards
                ? fromPage.style.top = (100 - percent) + "%"
                : toPage.style.top = percent + "%";
            }
            else {
                fromPage.style.left = (backwards ? (100 - percent) : (percent - 100)) + "%";
                toPage.style.left = (backwards ? -percent : percent) + "%";
            }
        }
    }

    function preloadImages() {
        var preloader = document.createElement("div");
        preloader.id = "preloader";
        document.body.appendChild(preloader);
    }

    function submitForm(form) {
        iui.showPageByHref(form.action || "POST", encodeForm(form), form.method);
    }

    function encodeForm(form) {
        function encode(inputs) {
            for (var i = 0; i < inputs.length; ++i) {
                if (inputs[i].name) {
                    if (inputs[i].getAttribute("type") == "checkbox" && !inputs[i].checked) {
                        continue;
                    } else {
                        args.push(inputs[i].name + "=" + escape(inputs[i].value));
                    }
                }
            }
        }

        var args = [];
        encode(form.getElementsByTagName("input"));
        encode(form.getElementsByTagName("select"));
        encode(form.getElementsByTagName("textarea"));
        return args;
    }

    function findParent(node, localName) {
        while (node && (node.nodeType != 1 || node.localName.toLowerCase() != localName))
            node = node.parentNode;
        return node;
    }

    function hasClass(self, name) {
        var re = new RegExp("(^|\\s)" + name + "($|\\s)");
        return re.exec(self.getAttribute("class")) != null;
    }

    function replaceElementWithSource(replace, source) {
        var page = replace.parentNode;
        var parent = replace;
        while (page.parentNode != document.body) {
            page = page.parentNode;
            parent = parent.parentNode;
        }

        var frag = document.createElement(parent.localName);
        frag.innerHTML = source;

        page.removeChild(parent);

        while (frag.firstChild)
            page.appendChild(frag.firstChild);
    }

    function $(id) { return document.getElementById(id); }
    function ddd() { console.log.apply(console, arguments); }

})();