define(['jQuery'], function ($) {

    function getNode(item, folderState, selected) {

        var htmlName = getNodeInnerHtml(item);

        var node = {
            id: item.Id,
            text: htmlName,

            state: {
                opened: item.IsFolder && folderState == 'open',
                selected: selected
            },

            li_attr: {}
        };

        if (item.IsFolder) {
            node.children = [
                    {
                        text: 'Loading...',
                        icon: false
                    }];
            node.icon = false;
        }
        else {
            node.icon = false;
        }

        if (node.state.opened) {
            node.li_attr.loadedFromServer = true;
        }

        if (selected) {
            selectedNodeId = item.Id;
        }

        return node;
    }

    function getNodeInnerHtml(item) {

        var name = item.Name;

        // Channel number
        if (item.Number) {
            name = item.Number + " - " + name;
        }
        if (item.IndexNumber != null && item.Type != "Season") {
            name = item.IndexNumber + " - " + name;
        }

        var cssClass = "editorNode";

        if (item.LocationType == "Offline") {
            cssClass += " offlineEditorNode";
        }

        var htmlName = "<div class='" + cssClass + "'>";

        if (item.LockData) {
            htmlName += '<iron-icon icon="lock" style="height:18px"></iron-icon>';
        }

        htmlName += name;

        if (!item.ImageTags || !item.ImageTags.Primary) {
            htmlName += '<img src="css/images/editor/missingprimaryimage.png" title="' + Globalize.translate('MissingPrimaryImage') + '" />';
        }

        if (!item.BackdropImageTags || !item.BackdropImageTags.length) {
            if (item.Type !== "Episode" && item.Type !== "Season" && item.MediaType !== "Audio" && item.Type !== "TvChannel" && item.Type !== "MusicAlbum") {
                htmlName += '<img src="css/images/editor/missingbackdrop.png" title="' + Globalize.translate('MissingBackdropImage') + '" />';
            }
        }

        if (!item.ImageTags || !item.ImageTags.Logo) {
            if (item.Type == "Movie" || item.Type == "Trailer" || item.Type == "Series" || item.Type == "MusicArtist" || item.Type == "BoxSet") {
                htmlName += '<img src="css/images/editor/missinglogo.png" title="' + Globalize.translate('MissingLogoImage') + '" />';
            }
        }

        if (item.Type == "Episode" && item.LocationType == "Virtual") {

            try {
                if (item.PremiereDate && (new Date().getTime() >= parseISO8601Date(item.PremiereDate, { toLocal: true }).getTime())) {
                    htmlName += '<img src="css/images/editor/missing.png" title="' + Globalize.translate('MissingEpisode') + '" />';
                }
            } catch (err) {

            }

        }

        htmlName += "</div>";

        return htmlName;
    }

    function loadChildrenOfRootNode(page, scope, callback) {

        ApiClient.getLiveTvChannels({ limit: 0 }).then(function (result) {

            var nodes = [];

            nodes.push({

                id: 'MediaFolders',
                text: Globalize.translate('HeaderMediaFolders'),
                state: {
                    opened: true
                },
                li_attr: {
                    itemtype: 'mediafolders',
                    loadedFromServer: true
                },
                icon: false
            });

            if (result.TotalRecordCount) {

                nodes.push({

                    id: 'livetv',
                    text: Globalize.translate('HeaderLiveTV'),
                    state: {
                        opened: false
                    },
                    li_attr: {
                        itemtype: 'livetv'
                    },
                    children: [
                    {
                        text: 'Loading...',
                        icon: false
                    }],
                    icon: false
                });
            }

            callback.call(scope, nodes);

            nodesToLoad.push('MediaFolders');
        });
    }

    function loadLiveTvChannels(service, openItems, callback) {

        ApiClient.getLiveTvChannels({ ServiceName: service, AddCurrentProgram: false }).then(function (result) {

            var nodes = result.Items.map(function (i) {

                var state = openItems.indexOf(i.Id) == -1 ? 'closed' : 'open';

                return getNode(i, state, false);

            });

            callback(nodes);

        });

    }

    function loadMediaFolders(page, scope, openItems, callback) {

        ApiClient.getJSON(ApiClient.getUrl("Library/MediaFolders")).then(function (result) {

            var nodes = result.Items.map(function (n) {

                var state = openItems.indexOf(n.Id) == -1 ? 'closed' : 'open';

                return getNode(n, state, false);

            });

            callback.call(scope, nodes);

            for (var i = 0, length = nodes.length; i < length; i++) {
                if (nodes[i].state.opened) {

                    nodesToLoad.push(nodes[i].id);
                }
            }

        });

    }

    function loadNode(page, scope, node, openItems, selectedId, currentUser, callback) {

        var id = node.id;

        if (id == '#') {

            loadChildrenOfRootNode(page, scope, callback);
            return;
        }

        if (id == 'livetv') {

            loadLiveTvChannels(id, openItems, callback);
            return;
        }

        if (id == 'MediaFolders') {

            loadMediaFolders(page, scope, openItems, callback);
            return;
        }

        var query = {
            ParentId: id,
            Fields: 'Settings'
        };

        var itemtype = node.li_attr.itemtype;

        if (itemtype != "Season" && itemtype != "Series") {
            query.SortBy = "SortName";
        }

        ApiClient.getItems(Dashboard.getCurrentUserId(), query).then(function (result) {

            var nodes = result.Items.map(function (n) {

                var state = openItems.indexOf(n.Id) == -1 ? 'closed' : 'open';

                return getNode(n, state, n.Id == selectedId);

            });

            callback.call(scope, nodes);

            for (var i = 0, length = nodes.length; i < length; i++) {
                if (nodes[i].state.opened) {

                    nodesToLoad.push(nodes[i].id);
                }
            }

        });

    }

    function scrollToNode(page, id) {

        var elem = $('#' + id, page)[0];

        if (elem) {
            // commenting out for now because it's causing the whole window to scroll in chrome
            elem.scrollIntoView();
        }
    }

    function initializeTree(page, currentUser, openItems, selectedId) {

        require(['jstree'], function () {
            initializeTreeInternal(page, currentUser, openItems, selectedId);
        });
    }

    function onNodeSelect(event, data) {
        var node = data.node;

        var eventData = {
            id: node.id,
            itemType: node.li_attr.itemtype
        };

        if (eventData.itemType != 'livetv' && eventData.itemType != 'mediafolders') {
            $(this).trigger('itemclicked', [eventData]);
        }
    }

    function onNodeOpen(event, data) {

        var page = $(this).parents('.page')[0];
        var node = data.node;

        if (node.children && node.children) {
            loadNodesToLoad(page, node);
        }

        if (node.li_attr && node.id != '#' && !node.li_attr.loadedFromServer) {

            node.li_attr.loadedFromServer = true;

            $.jstree.reference(".libraryTree", page).load_node(node.id, loadNodeCallback);
        }
    }

    function onNodeLoad(event, data) {

        var page = $(this).parents('.page')[0];
        var node = data.node;

        if (node.children && node.children) {
            loadNodesToLoad(page, node);
        }

        if (node.li_attr && node.id != '#' && !node.li_attr.loadedFromServer) {

            node.li_attr.loadedFromServer = true;

            $.jstree.reference(".libraryTree", page).load_node(node.id, loadNodeCallback);
        }
    }

    function initializeTreeInternal(page, currentUser, openItems, selectedId) {

        nodesToLoad = [];
        selectedNodeId = null;

        $.jstree.destroy();

        $('.libraryTree', page).jstree({

            "plugins": ["wholerow"],

            core: {

                check_callback: true,
                data: function (node, callback) {

                    loadNode(page, this, node, openItems, selectedId, currentUser, callback);
                },

                themes: {
                    variant: 'large'
                }
            }

        }).off('select_node.jstree', onNodeSelect).on('select_node.jstree', onNodeSelect).off('open_node.jstree', onNodeOpen).on('open_node.jstree', onNodeOpen).off('load_node.jstree', onNodeLoad).on('load_node.jstree', onNodeLoad);
    }

    function loadNodesToLoad(page, node) {

        var children = node.children;

        for (var i = 0, length = children.length; i < length; i++) {

            var child = children[i];

            if (nodesToLoad.indexOf(child) != -1) {

                nodesToLoad = nodesToLoad.filter(function (n) {
                    return n != child;
                });

                $.jstree.reference(".libraryTree", page).load_node(child, loadNodeCallback);
            }
        }
    }

    function loadNodeCallback(node) {

        if (selectedNodeId && node.children && node.children.indexOf(selectedNodeId) != -1) {

            setTimeout(function () {

                scrollToNode($.mobile.activePage, selectedNodeId);
            }, 500);
        }
    }

    var nodesToLoad = [];
    var selectedNodeId;

    function updateEditorNode(page, item) {

        var elem = $('#' + item.Id + '>a', page)[0];

        if (elem == null) {
            return;
        }

        $('.editorNode', elem).remove();

        $(elem).append(getNodeInnerHtml(item));

        if (item.IsFolder) {

            var tree = jQuery.jstree._reference(".libraryTree");
            var currentNode = tree._get_node(null, false);
            tree.refresh(currentNode);
        }
    }

    $(document).on('itemsaved', ".metadataEditorPage", function (e, item) {

        updateEditorNode(this, item);

    }).on('pagebeforeshow', ".metadataEditorPage", function () {

        require(['css!css/metadataeditor.css']);

    }).on('pagebeforeshow', ".metadataEditorPage", function () {

        var page = this;

        Dashboard.getCurrentUser().then(function (user) {

            var id = getCurrentItemId();

            if (id) {

                ApiClient.getAncestorItems(id, user.Id).then(function (ancestors) {

                    var ids = ancestors.map(function (i) {
                        return i.Id;
                    });

                    initializeTree(page, user, ids, id);
                });

            } else {
                initializeTree(page, user, []);
            }

        });

    }).on('pagebeforehide', ".metadataEditorPage", function () {

        var page = this;

        $('.libraryTree', page).off('select_node.jstree', onNodeSelect).off('open_node.jstree', onNodeOpen).off('load_node.jstree', onNodeLoad);

    });

    var itemId;
    function setCurrentItemId(id) {
        itemId = id;
    }

    function getCurrentItemId() {

        if (itemId) {
            return itemId;
        }

        var url = window.location.hash || window.location.href;

        return getParameterByName('id', url);
    }

    window.MetadataEditor = {
        getItemPromise: function() {
            var currentItemId = getCurrentItemId();

            if (currentItemId) {
                return ApiClient.getItem(Dashboard.getCurrentUserId(), currentItemId);
            }

            return ApiClient.getRootFolder(Dashboard.getCurrentUserId());
        },
        getCurrentItemId: getCurrentItemId,
        setCurrentItemId: setCurrentItemId
    };

});