/**
 * The TreePanel provides tree-structured UI representation of tree-structured data.
 * A TreePanel must be bound to a {@link Ext.data.TreeStore}. TreePanel's support
 * multiple columns through the {@link #columns} configuration.
 *
 * Simple TreePanel using inline data:
 *
 *     @example
 *     var store = Ext.create('Ext.data.TreeStore', {
 *         root: {
 *             expanded: true,
 *             children: [
 *                 { text: "detention", leaf: true },
 *                 { text: "homework", expanded: true, children: [
 *                     { text: "book report", leaf: true },
 *                     { text: "alegrbra", leaf: true}
 *                 ] },
 *                 { text: "buy lottery tickets", leaf: true }
 *             ]
 *         }
 *     });
 *
 *     Ext.create('Ext.tree.Panel', {
 *         title: 'Simple Tree',
 *         width: 200,
 *         height: 150,
 *         store: store,
 *         rootVisible: false,
 *         renderTo: Ext.getBody()
 *     });
 *
 * For the tree node config options (like `text`, `leaf`, `expanded`), see the documentation of
 * {@link Ext.data.NodeInterface NodeInterface} config options.
 */
Ext.define('Ext.tree.Panel', {
    extend: 'Ext.panel.Table',
    alias: 'widget.treepanel',
    alternateClassName: ['Ext.tree.TreePanel', 'Ext.TreePanel'],
    requires: ['Ext.tree.View', 'Ext.selection.TreeModel', 'Ext.tree.Column', 'Ext.data.TreeStore'],
    viewType: 'treeview',
    selType: 'treemodel',

    treeCls: Ext.baseCSSPrefix + 'tree-panel',

    deferRowRender: false,

    /**
     * @private
     * @cfg {Boolean} rowLines
     * False so that rows are not separated by lines.
     */
    rowLines: false,

    /**
     * @cfg {Boolean} lines
     * False to disable tree lines.
     */
    lines: true,

    /**
     * @cfg {Boolean} useArrows
     * True to use Vista-style arrows in the tree.
     */
    useArrows: false,

    /**
     * @cfg {Boolean} singleExpand
     * True if only 1 node per branch may be expanded.
     */
    singleExpand: false,

    ddConfig: {
        enableDrag: true,
        enableDrop: true
    },

    /**
     * @cfg {Boolean} animate
     * True to enable animated expand/collapse. Defaults to the value of {@link Ext#enableFx}.
     */

    /**
     * @cfg {Boolean} rootVisible
     * False to hide the root node.
     */
    rootVisible: true,

    /**
     * @cfg {String} displayField
     * The field inside the model that will be used as the node's text.
     */
    displayField: 'text',

    /**
     * @cfg {Ext.data.Model/Ext.data.NodeInterface/Object} root
     * Allows you to not specify a store on this TreePanel. This is useful for creating a simple tree with preloaded
     * data without having to specify a TreeStore and Model. A store and model will be created and root will be passed
     * to that store. For example:
     *
     *     Ext.create('Ext.tree.Panel', {
     *         title: 'Simple Tree',
     *         root: {
     *             text: "Root node",
     *             expanded: true,
     *             children: [
     *                 { text: "Child 1", leaf: true },
     *                 { text: "Child 2", leaf: true }
     *             ]
     *         },
     *         renderTo: Ext.getBody()
     *     });
     */
    root: null,

    // Required for the Lockable Mixin. These are the configurations which will be copied to the
    // normal and locked sub tablepanels
    normalCfgCopy: ['displayField', 'root', 'singleExpand', 'useArrows', 'lines', 'rootVisible', 'scroll'],
    lockedCfgCopy: ['displayField', 'root', 'singleExpand', 'useArrows', 'lines', 'rootVisible'],
    
    isTree: true,

    /**
     * @cfg {Boolean} hideHeaders
     * True to hide the headers.
     */

    /**
     * @cfg {Boolean} folderSort
     * True to automatically prepend a leaf sorter to the store.
     */
     
    /**
     * @cfg {Ext.data.TreeStore} store (required)
     * The {@link Ext.data.TreeStore Store} the tree should use as its data source.
     */

    constructor: function(config) {
        config = config || {};
        if (config.animate === undefined) {
            config.animate = Ext.isDefined(this.animate) ? this.animate : Ext.enableFx;
        }
        this.enableAnimations = config.animate;
        delete config.animate;

        this.callParent([config]);
    },

    initComponent: function() {
        var me = this,
            cls = [me.treeCls],
            view;

        if (me.useArrows) {
            cls.push(Ext.baseCSSPrefix + 'tree-arrows');
            me.lines = false;
        }

        if (me.lines) {
            cls.push(Ext.baseCSSPrefix + 'tree-lines');
        } else if (!me.useArrows) {
            cls.push(Ext.baseCSSPrefix + 'tree-no-lines');
        }

        if (Ext.isString(me.store)) {
            me.store = Ext.StoreMgr.lookup(me.store);
        } else if (!me.store || Ext.isObject(me.store) && !me.store.isStore) {
            me.store = new Ext.data.TreeStore(Ext.apply({}, me.store || {}, {
                root: me.root,
                fields: me.fields,
                model: me.model,
                folderSort: me.folderSort
            }));
        } else if (me.root) {
            me.store = Ext.data.StoreManager.lookup(me.store);
            me.store.setRootNode(me.root);
            if (me.folderSort !== undefined) {
                me.store.folderSort = me.folderSort;
                me.store.sort();
            }
        }

        // I'm not sure if we want to this. It might be confusing
        // if (me.initialConfig.rootVisible === undefined && !me.getRootNode()) {
        //     me.rootVisible = false;
        // }

        me.viewConfig = Ext.apply({}, me.viewConfig);
        me.viewConfig = Ext.applyIf(me.viewConfig, {
            rootVisible: me.rootVisible,
            animate: me.enableAnimations,
            singleExpand: me.singleExpand,
            node: me.store.getRootNode(),
            hideHeaders: me.hideHeaders
        });

        me.mon(me.store, {
            scope: me,
            rootchange: me.onRootChange,
            clear: me.onClear
        });

        me.relayEvents(me.store, [
            /**
             * @event beforeload
             * @inheritdoc Ext.data.Store#beforeload
             */
            'beforeload',

            /**
             * @event load
             * @inheritdoc Ext.data.Store#load
             */
            'load'
        ]);

        me.store.on({
            /**
             * @event itemappend
             * @inheritdoc Ext.data.TreeStore#append
             */
            append: me.createRelayer('itemappend'),

            /**
             * @event itemremove
             * @inheritdoc Ext.data.TreeStore#remove
             */
            remove: me.createRelayer('itemremove'),

            /**
             * @event itemmove
             * @inheritdoc Ext.data.TreeStore#move
             */
            move: me.createRelayer('itemmove', [0, 4]),

            /**
             * @event iteminsert
             * @inheritdoc Ext.data.TreeStore#insert
             */
            insert: me.createRelayer('iteminsert'),

            /**
             * @event beforeitemappend
             * @inheritdoc Ext.data.TreeStore#beforeappend
             */
            beforeappend: me.createRelayer('beforeitemappend'),

            /**
             * @event beforeitemremove
             * @inheritdoc Ext.data.TreeStore#beforeremove
             */
            beforeremove: me.createRelayer('beforeitemremove'),

            /**
             * @event beforeitemmove
             * @inheritdoc Ext.data.TreeStore#beforemove
             */
            beforemove: me.createRelayer('beforeitemmove'),

            /**
             * @event beforeiteminsert
             * @inheritdoc Ext.data.TreeStore#beforeinsert
             */
            beforeinsert: me.createRelayer('beforeiteminsert'),

            /**
             * @event itemexpand
             * @inheritdoc Ext.data.TreeStore#expand
             */
            expand: me.createRelayer('itemexpand', [0, 1]),

            /**
             * @event itemcollapse
             * @inheritdoc Ext.data.TreeStore#collapse
             */
            collapse: me.createRelayer('itemcollapse', [0, 1]),

            /**
             * @event beforeitemexpand
             * @inheritdoc Ext.data.TreeStore#beforeexpand
             */
            beforeexpand: me.createRelayer('beforeitemexpand', [0, 1]),

            /**
             * @event beforeitemcollapse
             * @inheritdoc Ext.data.TreeStore#beforecollapse
             */
            beforecollapse: me.createRelayer('beforeitemcollapse', [0, 1])
        });

        // If the user specifies the headers collection manually then dont inject our own
        if (!me.columns) {
            if (me.initialConfig.hideHeaders === undefined) {
                me.hideHeaders = true;
            }
            me.addCls(Ext.baseCSSPrefix + 'autowidth-table');
            me.columns = [{
                xtype    : 'treecolumn',
                text     : 'Name',
                width    : Ext.isIE6 ? null : 10000,
                dataIndex: me.displayField         
            }];
        }

        if (me.cls) {
            cls.push(me.cls);
        }
        me.cls = cls.join(' ');
        me.callParent();
        
        view = me.getView();

        me.relayEvents(view, [
            /**
             * @event checkchange
             * Fires when a node with a checkbox's checked property changes
             * @param {Ext.data.Nodeinterface} node The node who's checked property was changed
             * @param {Boolean} checked The node's new checked state
             */
            'checkchange',
            /**
             * @event afteritemexpand
             * @inheritdoc Ext.tree.View#afteritemexpand
             */
            'afteritemexpand',
            /**
             * @event afteritemcollapse
             * @inheritdoc Ext.tree.View#afteritemcollapse
             */
            'afteritemcollapse'
        ]);

        // If the root is not visible and there is no rootnode defined, then just lets load the store
        if (!view.rootVisible && !me.getRootNode()) {
            me.setRootNode({
                expanded: true
            });
        }
    },
    
    onClear: function(){
        this.view.onClear();
    },

    /**
     * Sets root node of this tree.
     * @param {Ext.data.Model/Ext.data.NodeInterface/Object} root
     * @return {Ext.data.NodeInterface} The new root
     */
    setRootNode: function() {
        return this.store.setRootNode.apply(this.store, arguments);
    },

    /**
     * Returns the root node for this tree.
     * @return {Ext.data.NodeInterface}
     */
    getRootNode: function() {
        return this.store.getRootNode();
    },

    onRootChange: function(root) {
        this.view.setRootNode(root);
    },

    /**
     * Retrieve an array of checked records.
     * @return {Ext.data.NodeInterface[]} An array containing the checked records
     */
    getChecked: function() {
        return this.getView().getChecked();
    },

    isItemChecked: function(rec) {
        return rec.get('checked');
    },

    /**
     * Expand all nodes
     * @param {Function} [callback] A function to execute when the expand finishes.
     * @param {Object} [scope] The scope of the callback function
     */
    expandAll : function(callback, scope) {
        var root = this.getRootNode(),
            animate = this.enableAnimations,
            view = this.getView();
        if (root) {
            if (!animate) {
                view.beginBulkUpdate();
            }
            root.expand(true, callback, scope);
            if (!animate) {
                view.endBulkUpdate();
            }
        }
    },

    /**
     * Collapse all nodes
     * @param {Function} [callback] A function to execute when the collapse finishes.
     * @param {Object} [scope] The scope of the callback function
     */
    collapseAll : function(callback, scope) {
        var root = this.getRootNode(),
            animate = this.enableAnimations,
            view = this.getView();

        if (root) {
            if (!animate) {
                view.beginBulkUpdate();
            }
            if (view.rootVisible) {
                root.collapse(true, callback, scope);
            } else {
                root.collapseChildren(true, callback, scope);
            }
            if (!animate) {
                view.endBulkUpdate();
            }
        }
    },

    /**
     * Expand the tree to the path of a particular node.
     * @param {String} path The path to expand. The path should include a leading separator.
     * @param {String} [field] The field to get the data from. Defaults to the model idProperty.
     * @param {String} [separator='/'] A separator to use.
     * @param {Function} [callback] A function to execute when the expand finishes. The callback will be called with
     * (success, lastNode) where success is if the expand was successful and lastNode is the last node that was expanded.
     * @param {Object} [scope] The scope of the callback function
     */
    expandPath: function(path, field, separator, callback, scope) {
        var me = this,
            current = me.getRootNode(),
            index = 1,
            view = me.getView(),
            keys,
            expander;

        field = field || me.getRootNode().idProperty;
        separator = separator || '/';

        if (Ext.isEmpty(path)) {
            Ext.callback(callback, scope || me, [false, null]);
            return;
        }

        keys = path.split(separator);
        if (current.get(field) != keys[1]) {
            // invalid root
            Ext.callback(callback, scope || me, [false, current]);
            return;
        }

        expander = function(){
            if (++index === keys.length) {
                Ext.callback(callback, scope || me, [true, current]);
                return;
            }
            var node = current.findChild(field, keys[index]);
            if (!node) {
                Ext.callback(callback, scope || me, [false, current]);
                return;
            }
            current = node;
            current.expand(false, expander);
        };
        current.expand(false, expander);
    },

    /**
     * Expand the tree to the path of a particular node, then select it.
     * @param {String} path The path to select. The path should include a leading separator.
     * @param {String} [field] The field to get the data from. Defaults to the model idProperty.
     * @param {String} [separator='/'] A separator to use.
     * @param {Function} [callback] A function to execute when the select finishes. The callback will be called with
     * (bSuccess, oLastNode) where bSuccess is if the select was successful and oLastNode is the last node that was expanded.
     * @param {Object} [scope] The scope of the callback function
     */
    selectPath: function(path, field, separator, callback, scope) {
        var me = this,
            keys,
            last;

        field = field || me.getRootNode().idProperty;
        separator = separator || '/';

        keys = path.split(separator);
        last = keys.pop();

        me.expandPath(keys.join(separator), field, separator, function(success, node){
            var doSuccess = false;
            if (success && node) {
                node = node.findChild(field, last);
                if (node) {
                    me.getSelectionModel().select(node);
                    Ext.callback(callback, scope || me, [true, node]);
                    doSuccess = true;
                }
            } else if (node === me.getRootNode()) {
                doSuccess = true;
            }
            Ext.callback(callback, scope || me, [doSuccess, node]);
        }, me);
    }
});