/**
 * Created by Mai on 2017/3/17.
 */
var idTree = {
    createNew: function (setting) {
        var _setting = {
            id: 'id',
            pid: 'pid',
            nid: 'nid',
            rootId: -1
        };

        var _eventType = {
            editedData: 'editedData'
        };

        var tools = {
            findNode: function (nodes, check) {
                for (var i = 0; i < nodes.length; i++) {
                    if (check(nodes[i])) {
                        return nodes[i];
                    }
                }
                return null;
            },
            reSortNodes: function (nodes, recursive) {
                var temp = [], first;
                var findFirstNode = function (nodes) {
                    return tools.findNode(nodes, function (node) {
                        return node.preSibling === null;
                    });
                };
                var moveNode = function (node, orgArray, newArray, newIndex) {
                    var next;
                    orgArray.splice(orgArray.indexOf(node), 1);
                    newArray.splice(newIndex, 0, node);
                    if (node.getNextSiblingID() !== -1) {
                        next = node.nextSibling;
                        if (next && (orgArray.indexOf(next) >= 0)) {
                            moveNode(next, orgArray, newArray, newIndex + 1);
                        }
                    }
                };
                if (nodes.length === 0) {
                    return nodes;
                }
                if (recursive) {
                    nodes.forEach(function (node) {
                        node.children = tools.reSortNodes(node.children, recursive);
                    });
                }
                while (nodes.length > 0) {
                    first = findFirstNode(nodes);
                    first = first ? first : nodes[0];
                    moveNode(first, nodes, temp, temp.length);
                }
                nodes = null;
                tools.reSiblingNodes(temp);
                return temp;
            },
            reSiblingNodes: function (nodes) {
                var i;
                for (i = 0; i < nodes.length; i++) {
                    nodes[i].preSibling = (i === 0) ? null : nodes[i - 1];
                    nodes[i].nextSibling = (i === nodes.length - 1) ? null : nodes[i + 1];
                }
            },
            // 在nodes中，从iIndex（包括）开始全部移除
            removeNodes: function (tree, parent, iIndex, count) {
                var children = parent ? parent.children : tree.roots;
                var pre = (iIndex < 0 || iIndex >= children.length) ? null : children[iIndex].preSibling;
                var next = (pre && iIndex + count - 1 < children.length) ? children[iIndex + count] : null;
                if (pre) {
                    pre.nextSibling = next;
                }
                if (next) {
                    next.preSibling = pre;
                }
                if (arguments.length === 4) {
                    children.splice(iIndex, count);
                } else {
                    children.splice(iIndex, children.length - iIndex);
                }
            },
            // 在nodes中增加addNodes, 位置从index开始
            addNodes: function (tree, parent, nodes, iIndex) {
                var children = parent ? parent.children : tree.roots;
                var pre, next, i;
                if (nodes.length === 0) { return; }
                if (arguments.length === 4) {
                    pre = (iIndex <= 0 || iIndex > children.length) ? null : children[iIndex - 1];
                    next = pre ? pre.nextSibling : null;
                } else if (arguments.length === 3) {
                    pre = children.length === 0 ? null : children[children.length - 1];
                    next = null;
                }
                if (pre) {
                    pre.nextSibling = nodes[0];
                }
                nodes[0].preSibling = pre;
                if (next) {
                    next.preSibling = nodes[nodes.length - 1];
                }
                nodes[nodes.length - 1].nextSibling = next;
                for (i = 0; i < nodes.length; i++) {
                    if (arguments.length === 4) {
                        children.splice(iIndex + i, 0, nodes[i]);
                    } else if (arguments.length === 3) {
                        children.push(nodes[i]);
                    }
                    nodes[i].parent = parent;
                }
            },
            sortTreeItems: function (tree) {
                var addItems = function (items) {
                    var i;
                    for (i = 0; i < items.length; i++) {
                        tree.items.push(items[i]);
                        addItems(items[i].children);
                    }
                };
                tree.items.splice(0, tree.items.length);
                addItems(tree.roots);
            }
        };

        var Node = function (tree, data) {
            // 以下的属性，本单元外均不可直接修改
            this.tree = tree;
            this.data = data;
            this.children = [];

            this.parent = null;
            this.nextSibling = null;
            this.preSibling = null;

            this.expanded = true;
            this.visible = true;

            this.visible = true;

            this.isUpdate = false;
            this.isNew = false;
        };

        Node.prototype.getID = function () {
            return this.data[this.tree.setting.id];
        };
        Node.prototype.getParentID = function () {
            return this.parent ? this.parent.getID() : -1;
        };
        Node.prototype.getNextSiblingID = function () {
            return this.nextSibling ? this.nextSibling.getID() : -1;
        };

        Node.prototype.firstChild = function () {
            return this.children.length === 0 ? null : this.children[0];
        };
        Node.prototype.depth = function () {
            return this.parent ? this.parent.depth() + 1 : 0;
        };
        Node.prototype.isFirst = function () {
            if (this.parent) {
                return this.parent.children.indexOf(this) === 0 ? true : false;
            } else {
                return this.tree.roots.indexOf(this) === 0 ? true : false;
            }
        };
        Node.prototype.isLast = function () {
            if (this.parent) {
                return this.parent.children.indexOf(this) === this.parent.children.length - 1 ? true : false;
            } else {
                return this.tree.roots.indexOf(this) === this.tree.roots.length - 1 ? true : false;
            }
        };
        Node.prototype.siblingIndex = function () {
            return this.parent ? this.parent.children.indexOf(this) : this.tree.roots.indexOf(this);
        }
        Node.prototype.posterityCount = function () {
            var iCount = 0;
            if (this.children.length !== 0) {
                iCount += this.children.length;
                this.children.forEach(function (child) {
                    iCount += child.posterityCount();
                });
            }
            return iCount;
            /*return (node.children.length === 0) ? 0 : node.children.reduce(function (x, y) {
                return x.posterityCount() + y.posterityCount();
            }) + node.children.count;*/
        };

        Node.prototype.setExpanded = function (expanded) {
            var setNodesVisible = function (nodes, visible) {
                nodes.forEach(function (node) {
                    node.visible = visible;
                    setNodesVisible(node.children, visible && node.expanded);
                })
            };
            this.expanded = expanded;
            setNodesVisible(this.children, expanded);
        };
        /*Node.prototype.vis = function () {
            return this.parent ? this.parent.vis() && this.parent.expanded() : true;
        };*/
        Node.prototype.serialNo = function () {
            return this.tree.items.indexOf(this);
        };

        Node.prototype.addChild = function (node) {
            var preSibling = this.children.length === 0 ? null : this.children[this.children.length - 1];
            node.parent = this;
            if (preSibling) {
                preSibling.nextSibling = node;
            }
            node.preSibling = preSibling;
            this.children.push(node);
        };
        Node.prototype.removeChild = function (node) {
            var preSibling = node.preSibling, nextSibling = node.nextSibling;
            if (preSibling) {
                preSibling.nextSibling = nextSibling;
            }
            if (nextSibling) {
                nextSibling.preSibling = preSibling;
            }
            this.children.splice(this.children.re)
        };

        Node.prototype.canUpLevel = function () {
            return this.parent ? true : false;
        };
        Node.prototype.canDownLevel = function () {
            return !this.isFirst();
        };
        Node.prototype.canUpMove = function () {
            return !this.isFirst();
        };
        Node.prototype.canDownMove = function () {
            return !this.isLast();
        }

        Node.prototype.upLevel = function () {
            var success = false,
                iIndex = this.parent.children.indexOf(this), orgParent = this.parent, newNextSibling = this.parent.nextSibling;
            if (this.canUpLevel) {
                // NextSiblings become child
                tools.addNodes(this.tree, this, this.parent.children.slice(iIndex + 1));
                // Orginal Parent remove node and nextSiblings
                tools.removeNodes(this.tree, this.parent, iIndex);
                // New Parent add node
                tools.addNodes(this.tree, this.parent.parent, [this], this.parent.siblingIndex() + 1);
                if (!this.expanded) {
                    this.setExpanded(true);
                }
                success = true;
            }
            return success;
        };
        Node.prototype.downLevel = function () {
            var success = false, iIndex = this.parent ? this.parent.children.indexOf(this) : this.tree.roots.indexOf(this);
            var newParent = this.preSibling;
            if (this.canDownLevel()) {
                tools.removeNodes(this.tree, this.parent, this.siblingIndex(), 1);
                tools.addNodes(this.tree, this.preSibling, [this]);
                if (!newParent.expanded) {
                    newParent.setExpanded(true);
                }
                success = true;
            }
            return success;
        };
        Node.prototype.upMove = function () {
            var success = false;
            var iIndex = this.siblingIndex(), belongArray = this.parent ? this.parent.children : this.tree.roots, orgPre = this.preSibling;
            if (this.canUpMove()) {
                orgPre.nextSibling = this.nextSibling;
                this.preSibling = orgPre.preSibling;
                orgPre.preSibling = this;
                this.nextSibling = orgPre;
                belongArray.splice(iIndex, 1);
                belongArray.splice(iIndex - 1, 0, this);
                tools.sortTreeItems(this.tree);
                success = true;
            }
            return success;
        };
        Node.prototype.downMove = function () {
            var success = false;
            var iIndex = this.siblingIndex(), belongArray = this.parent ? this.parent.children : this.tree.roots, orgNext = this.nextSibling;
            if (this.canDownMove()) {
                orgNext.preSibling = this.preSibling;
                this.nextSibling = orgNext.nextSibling;
                orgNext.nextSibling = this;
                this.preSibling = orgNext;
                belongArray.splice(iIndex, 1);
                belongArray.splice(iIndex + 1, 0, this);
                tools.sortTreeItems(this.tree);
                success = true;
            }
            return success;
        }

        var Tree = function (setting) {
            this.nodes = {};
            this.roots = [];
            this.items = [];
            this.setting = setting;
            this.prefix = 'id_';
            this.selected = null;

            this.event = {};
            this.eventType = _eventType;
        };

        Tree.prototype.maxNodeID = (function () {
            var maxID = 0;
            return function (ID) {
                if (arguments.length === 0) {
                    return maxID;
                } else {
                    maxID = Math.max(maxID, ID);
                }
            };
        })();
        Tree.prototype.rangeNodeID = (function () {
            var rangeID = -1;
            return function (ID) {
                if (arguments.length === 0) {
                    return rangeID;
                } else {
                    rangeID = Math.max(rangeID, ID);
                }
            }
        })();
        Tree.prototype.newNodeID = function () {
            if (this.rangeNodeID() === -1) {
                return this.maxNodeID() + 1;
            } else {
                if (this.maxNodeID() >= this.rangeNodeID()) {
                    return this.maxNodeID() + 1;
                } else {
                    return -1;
                }
            }
            /*if (this.maxID >= this.rangeNodeID() || this.rangeNodeID === -1) {
                return -1;
            } else {
                return this.maxNodeID() + 1;
            }*/
        };

        Tree.prototype.loadDatas = function (datas) {
            var prefix = this.prefix, i, node, parent, next, that = this;
            // prepare index
            datas.forEach(function (data) {
                var node = new Node(that, data);
                that.nodes[prefix + data[that.setting.id]] = node;
                that.maxNodeID(data[that.setting.id]);
            });
            // set parent by pid, set nextSibling by nid
            datas.forEach(function (data) {
                node = that.nodes[prefix + data[that.setting.id]];
                if (data[that.setting.pid] === that.setting.rootId) {
                    that.roots.push(node);
                } else {
                    parent = that.nodes[prefix + data[that.setting.pid]];
                    if (parent) {
                        node.parent = parent;
                        parent.children.push(node);
                    }
                }
                if (data[that.setting.nid] !== that.setting.rootId) {
                    next = that.nodes[prefix + data[that.setting.nid]];
                    if (next) {
                        node.nextSibling = next;
                        next.preSibling = node;
                    }
                }
            })
            // sort by nid
            this.roots = tools.reSortNodes(this.roots, true);
            tools.sortTreeItems(this);
        };
        Tree.prototype.firstNode = function () {
            return this.roots.length === 0 ? null : this.roots[0];
        };
        Tree.prototype.findNode = function (id) {
            return this.nodes[this.prefix + id];
        };
        Tree.prototype.count = function () {
            var iCount = 0;
            if (this.roots.length !== 0) {
                iCount += this.roots.length;
                this.roots.forEach(function (node) {
                    iCount += node.posterityCount();
                });
            }
            return iCount;
        };

        Tree.prototype.insert = function (parentID, nextSiblingID) {
            var newID = this.newNodeID(), node = null, data = {};
            var parent = parentID === -1 ? null : this.nodes[this.prefix + parentID];
            var nextSibling = nextSiblingID === -1 ? null: this.nodes[this.prefix + nextSiblingID];
            if (newID !== -1) {
                data = {};
                data[this.setting.id] = newID;
                data[this.setting.pid] = parentID;
                data[this.setting.nid] = nextSiblingID;
                node = new Node(this, data);
                if (nextSibling) {
                    tools.addNodes(this, parent, [node], nextSibling.siblingIndex());
                } else {
                    tools.addNodes(this, parent, [node]);
                }
                this.nodes[this.prefix + newID] = node;
                tools.sortTreeItems(this);
                this.maxNodeID(newID);
            }
            return node;
        };
        Tree.prototype.delete = function (node) {
            var success = false;
            if (node) {
                delete this.nodes[this.prefix + node.getID()];
                if (node.preSibling) {
                    node.preSibling.nextSibling = node.nextSibling;
                }
                if (node.nextSibling) {
                    node.nextSibling.preSibling = node.preSibling;
                }
                if (node.parent) {
                    node.parent.children.splice(node.siblingIndex(), 1);
                } else {
                    this.roots.splice(node.siblingIndex(), 1);
                }
                tools.sortTreeItems(this);
                success = true;
            }
            return success;
        };

        /*Tree.prototype.editedData = function (field, id, newText) {
            var node = this.findNode(id), result = {allow: false, nodes: []};
            if (this.event[this.eventType.editedData]) {
                return this.event[this.eventType.editedData](field, node.data);
            } else {
                node.data[field] = newText;
                result.allow = true;
                return result;
            }
        };*/

        Tree.prototype.bind = function (eventName, eventFun) {
            this.event[eventName] = eventFun;
        };

        return new Tree(setting);
    }
};