(function () {
    BI.Tree = function () {
        this.root = new BI.Node(BI.UUID());
    };

    BI.Tree.prototype = {
        constructor: BI.Tree,
        addNode: function (node, newNode, index) {
            if (BI.isNull(newNode)) {
                this.root.addChild(node, index);
            } else if (BI.isNull(node)) {
                this.root.addChild(newNode, index);
            } else {
                node.addChild(newNode, index);
            }
        },

        isRoot: function (node) {
            return node === this.root;
        },

        getRoot: function () {
            return this.root;
        },

        clear: function () {
            this.root.clear();
        },

        initTree: function (nodes) {
            var self = this;
            this.clear();
            var queue = [];
            BI.each(nodes, function (i, node) {
                var n = new BI.Node(node);
                n.set("data", node);
                self.addNode(n);
                queue.push(n);
            });
            while (!BI.isEmpty(queue)) {
                var parent = queue.shift();
                var node = parent.get("data");
                BI.each(node.children, function (i, child) {
                    var n = new BI.Node(child);
                    n.set("data", child);
                    queue.push(n);
                    self.addNode(parent, n);
                });
            }
        },

        _toJSON: function (node) {
            var self = this;
            var children = [];
            BI.each(node.getChildren(), function (i, child) {
                children.push(self._toJSON(child));
            });
            return BI.extend({
                id: node.id
            }, BI.deepClone(node.get("data")), (children.length > 0 ? {
                    children: children
                } : {}));
        },

        toJSON: function (node) {
            var self = this, result = [];
            BI.each((node || this.root).getChildren(), function (i, child) {
                result.push(self._toJSON(child));
            });
            return result;
        },

        _toJSONWithNode: function (node) {
            var self = this;
            var children = [];
            BI.each(node.getChildren(), function (i, child) {
                children.push(self._toJSONWithNode(child));
            });
            return BI.extend({
                id: node.id
            }, BI.deepClone(node.get("data")), {
                node: node
            }, (children.length > 0 ? {
                    children: children
                } : {}));
        },

        toJSONWithNode: function (node) {
            var self = this, result = [];
            BI.each((node || this.root).getChildren(), function (i, child) {
                result.push(self._toJSONWithNode(child));
            });
            return result;
        },

        search: function (root, target, param) {
            if (!(root instanceof BI.Node)) {
                return arguments.callee.apply(this, [this.root, root, target]);
            }
            var self = this, next = null;

            if (BI.isNull(target)) {
                return null;
            }
            if (BI.isEqual(root[param || "id"], target)) {
                return root;
            }
            BI.any(root.getChildren(), function (i, child) {
                next = self.search(child, target, param);
                if (null !== next) {
                    return true;
                }
            });
            return next;
        },

        _traverse: function (node, callback) {
            var queue = [];
            queue.push(node);
            while (!BI.isEmpty(queue)) {
                var temp = queue.shift();
                var b = callback && callback(temp);
                if (b === false) {
                    break;
                }
                if (b === true) {
                    continue;
                }
                if (temp != null) {
                    queue.push(...temp.getChildren());
                }
            }
        },

        traverse: function (callback) {
            this._traverse(this.root, callback);
        },

        _recursion: function (node, route, callback) {
            var self = this;
            return BI.every(node.getChildren(), function (i, child) {
                var next = BI.clone(route);
                next.push(child.id);
                var b = callback && callback(child, next);
                if (b === false) {
                    return false;
                }
                if (b === true) {
                    return true;
                }
                return self._recursion(child, next, callback);
            });
        },

        recursion: function (callback) {
            this._recursion(this.root, [], callback);
        },

        inOrderTraverse: function (callback) {
            this._inOrderTraverse(this.root, callback);
        },

        // 中序遍历(递归)
        _inOrderTraverse: function (node, callback) {
            if (node != null) {
                this._inOrderTraverse(node.getLeft());
                callback && callback(node);
                this._inOrderTraverse(node.getRight());
            }
        },

        // 中序遍历(非递归)
        nrInOrderTraverse: function (callback) {

            var stack = [];
            var node = this.root;
            while (node != null || !BI.isEmpty(stack)) {
                while (node != null) {
                    stack.push(node);
                    node = node.getLeft();
                }
                node = stack.pop();
                callback && callback(node);
                node = node.getRight();
            }
        },

        preOrderTraverse: function (callback) {
            this._preOrderTraverse(this.root, callback);
        },

        // 先序遍历(递归)
        _preOrderTraverse: function (node, callback) {
            if (node != null) {
                callback && callback(node);
                this._preOrderTraverse(node.getLeft());
                this._preOrderTraverse(node.getRight());
            }
        },

        // 先序遍历（非递归）
        nrPreOrderTraverse: function (callback) {

            var stack = [];
            var node = this.root;

            while (node != null || !BI.isEmpty(stack)) {

                while (node != null) {
                    callback && callback(node);
                    stack.push(node);
                    node = node.getLeft();
                }
                node = stack.pop();
                node = node.getRight();
            }
        },

        postOrderTraverse: function (callback) {
            this._postOrderTraverse(this.root, callback);
        },

        // 后序遍历(递归)
        _postOrderTraverse: function (node, callback) {
            if (node != null) {
                this._postOrderTraverse(node.getLeft());
                this._postOrderTraverse(node.getRight());
                callback && callback(node);
            }
        },

        // 后续遍历(非递归)
        nrPostOrderTraverse: function (callback) {

            var stack = [];
            var node = this.root;
            var preNode = null;// 表示最近一次访问的节点

            while (node != null || !BI.isEmpty(stack)) {

                while (node != null) {
                    stack.push(node);
                    node = node.getLeft();
                }

                node = BI.last(stack);

                if (node.getRight() == null || node.getRight() == preNode) {
                    callback && callback(node);
                    node = stack.pop();
                    preNode = node;
                    node = null;
                } else {
                    node = node.getRight();
                }
            }
        }
    };

    BI.Node = function (id) {
        if (BI.isObject(id)) {
            BI.extend(this, id);
        } else {
            this.id = id;
        }
        this.clear.apply(this, arguments);
    };

    BI.Node.prototype = {
        constructor: BI.Node,

        set: function (key, value) {
            if (BI.isObject(key)) {
                BI.extend(this, key);
                return;
            }
            this[key] = value;
        },

        get: function (key) {
            return this[key];
        },

        isLeaf: function () {
            return BI.isEmpty(this.children);
        },

        getChildren: function () {
            return this.children;
        },

        getChildrenLength: function () {
            return this.children.length;
        },

        getFirstChild: function () {
            return BI.first(this.children);
        },

        getLastChild: function () {
            return BI.last(this.children);
        },

        setLeft: function (left) {
            this.left = left;
        },

        getLeft: function () {
            return this.left;
        },

        setRight: function (right) {
            this.right = right;
        },

        getRight: function () {
            return this.right;
        },

        setParent: function (parent) {
            this.parent = parent;
        },

        getParent: function () {
            return this.parent;
        },

        getChild: function (index) {
            return this.children[index];
        },

        getChildIndex: function (id) {
            return BI.findIndex(this.children, function (i, ch) {
                return ch.get("id") === id;
            });
        },

        removeChild: function (id) {
            this.removeChildByIndex(this.getChildIndex(id));
        },

        removeChildByIndex: function (index) {
            var before = this.getChild(index - 1);
            var behind = this.getChild(index + 1);
            if (before != null) {
                before.setRight(behind || null);
            }
            if (behind != null) {
                behind.setLeft(before || null);
            }
            this.children.splice(index, 1);
        },

        removeAllChilds: function () {
            this.children = [];
        },

        addChild: function (child, index) {
            var cur = null;
            if (BI.isUndefined(index)) {
                cur = this.children.length - 1;
            } else {
                cur = index - 1;
            }
            child.setParent(this);
            if (cur >= 0) {
                this.getChild(cur) && this.getChild(cur).setRight(child);
                child.setLeft(this.getChild(cur));
            }
            if (BI.isUndefined(index)) {
                this.children.push(child);
            } else {
                this.children.splice(index, 0, child);
            }
        },

        equals: function (obj) {
            return this === obj || this.id === obj.id;
        },

        clear: function () {
            this.parent = null;
            this.left = null;
            this.right = null;
            this.children = [];
        }
    };

    BI.extend(BI.Tree, {
        transformToArrayFormat: function (nodes, pId, childKey) {
            if (!nodes) return [];
            var r = [];
            childKey = childKey || "children";
            if (BI.isArray(nodes)) {
                for (var i = 0, l = nodes.length; i < l; i++) {
                    var node = BI.clone(nodes[i]);
                    node.pId = node.pId == null ? pId : node.pId;
                    delete node.children;
                    r.push(node);
                    if (nodes[i][childKey]) {
                        r = r.concat(BI.Tree.transformToArrayFormat(nodes[i][childKey], node.id));
                    }
                }
            } else {
                var newNodes = BI.clone(nodes);
                newNodes.pId = newNodes.pId == null ? pId : newNodes.pId;
                delete newNodes.children;
                r.push(newNodes);
                if (nodes[childKey]) {
                    r = r.concat(BI.Tree.transformToArrayFormat(nodes[childKey], newNodes.id));
                }
            }
            return r;
        },

        arrayFormat: function (nodes, pId) {
            if (!nodes) {
                return [];
            }
            var r = [];
            if (BI.isArray(nodes)) {
                for (var i = 0, l = nodes.length; i < l; i++) {
                    var node = nodes[i];
                    node.pId = node.pId == null ? pId : node.pId;
                    r.push(node);
                    if (nodes[i]["children"]) {
                        r = r.concat(BI.Tree.arrayFormat(nodes[i]["children"], node.id));
                    }
                }
            } else {
                var newNodes = nodes;
                newNodes.pId = newNodes.pId == null ? pId : newNodes.pId;
                r.push(newNodes);
                if (nodes["children"]) {
                    r = r.concat(BI.Tree.arrayFormat(nodes["children"], newNodes.id));
                }
            }
            return r;
        },

        transformToTreeFormat: function (sNodes) {
            var i, l;
            if (!sNodes) {
                return [];
            }

            if (BI.isArray(sNodes)) {
                var r = [];
                var tmpMap = {};
                for (i = 0, l = sNodes.length; i < l; i++) {
                    if (BI.isNull(sNodes[i].id)) {
                        return sNodes;
                    }
                    tmpMap[sNodes[i].id] = BI.clone(sNodes[i]);
                }
                for (i = 0, l = sNodes.length; i < l; i++) {
                    if (tmpMap[sNodes[i].pId] && sNodes[i].id !== sNodes[i].pId) {
                        if (!tmpMap[sNodes[i].pId].children) {
                            tmpMap[sNodes[i].pId].children = [];
                        }
                        tmpMap[sNodes[i].pId].children.push(tmpMap[sNodes[i].id]);
                    } else {
                        r.push(tmpMap[sNodes[i].id]);
                    }
                    delete tmpMap[sNodes[i].id].pId;
                }
                return r;
            }
            return [sNodes];

        },

        treeFormat: function (sNodes) {
            var i, l;
            if (!sNodes) {
                return [];
            }

            if (BI.isArray(sNodes)) {
                var r = [];
                var tmpMap = {};
                for (i = 0, l = sNodes.length; i < l; i++) {
                    if (BI.isNull(sNodes[i].id)) {
                        return sNodes;
                    }
                    tmpMap[sNodes[i].id] = sNodes[i];
                }
                for (i = 0, l = sNodes.length; i < l; i++) {
                    if (tmpMap[sNodes[i].pId] && sNodes[i].id !== sNodes[i].pId) {
                        if (!tmpMap[sNodes[i].pId].children) {
                            tmpMap[sNodes[i].pId].children = [];
                        }
                        tmpMap[sNodes[i].pId].children.push(tmpMap[sNodes[i].id]);
                    } else {
                        r.push(tmpMap[sNodes[i].id]);
                    }
                }
                return r;
            }
            return [sNodes];

        },

        traversal: function (array, callback, pNode) {
            if (BI.isNull(array)) {
                return;
            }
            var self = this;
            BI.some(array, function (i, item) {
                if (callback(i, item, pNode) === false) {
                    return true;
                }
                self.traversal(item.children, callback, item);
            });
        }
    });
})();