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import { NodeChildren as InnerNodeChildren, Node as InnerNode } from '@alilc/lowcode-designer';

import { NodeSchema, NodeData, TransformStage } from '@alilc/lowcode-types';

import Node from './node';

import { nodeSymbol, nodeChildrenSymbol } from './symbols';

export default class NodeChildren {

private readonly [nodeChildrenSymbol]: InnerNodeChildren;

constructor(nodeChildren: InnerNodeChildren) {

this[nodeChildrenSymbol] = nodeChildren;

}

static create(nodeChldren: InnerNodeChildren | null) {

if (!nodeChldren) return null;

return new NodeChildren(nodeChldren);

}

/**

* 返回当前 children 实例所属的节点实例

*/

get owner(): Node | null {

return Node.create(this[nodeChildrenSymbol].owner);

}

/**

* children 内的节点实例数

*/

get size() {

return this[nodeChildrenSymbol].size;

}

/**

* 是否为空

* @returns

*/

get isEmpty() {

return this[nodeChildrenSymbol].isEmpty();

}

/**

* 删除指定节点

* @param node

* @returns

*/

delete(node: Node) {

return this[nodeChildrenSymbol].delete(node[nodeSymbol]);

}

/**

* 插入一个节点

* @param node 待插入节点

* @param at 插入下标

* @returns

*/

insert(node: Node, at?: number | null) {

return this[nodeChildrenSymbol].insert(node[nodeSymbol], at, true);

}

/**

* 返回指定节点的下标

* @param node

* @returns

*/

indexOf(node: Node) {

return this[nodeChildrenSymbol].indexOf(node[nodeSymbol]);

}

/**

* 类似数组 splice 操作

* @param start

* @param deleteCount

* @param node

*/

splice(start: number, deleteCount: number, node?: Node) {

this[nodeChildrenSymbol].splice(start, deleteCount, node?.[nodeSymbol]);

}

/**

* 返回指定下标的节点

* @param index

* @returns

*/

get(index: number) {

return this[nodeChildrenSymbol].get(index);

}

/**

* 是否包含指定节点

* @param node

* @returns

*/

has(node: Node) {

return this[nodeChildrenSymbol].has(node[nodeSymbol]);

}

/**

* 类似数组的 forEach

* @param fn

*/

forEach(fn: (node: Node, index: number) => void) {

this[nodeChildrenSymbol].forEach((item: InnerNode<NodeSchema>, index: number) => {

fn(Node.create(item)!, index);

});

}

/**

* 类似数组的 map

* @param fn

*/

map<T>(fn: (node: Node, index: number) => T[]) {

return this[nodeChildrenSymbol].map((item: InnerNode<NodeSchema>, index: number) => {

return fn(Node.create(item)!, index);

});

}

/**

* 类似数组的 every

* @param fn

*/

every(fn: (node: Node, index: number) => boolean) {

return this[nodeChildrenSymbol].every((item: InnerNode<NodeSchema>, index: number) => {

return fn(Node.create(item)!, index);

});

}

/**

* 类似数组的 some

* @param fn

*/

some(fn: (node: Node, index: number) => boolean) {

return this[nodeChildrenSymbol].some((item: InnerNode<NodeSchema>, index: number) => {

return fn(Node.create(item)!, index);

});

}

/**

* 类似数组的 filter

* @param fn

*/

filter(fn: (node: Node, index: number) => boolean) {

return this[nodeChildrenSymbol]

.filter((item: InnerNode<NodeSchema>, index: number) => {

return fn(Node.create(item)!, index);

})

.map((item: InnerNode<NodeSchema>) => Node.create(item)!);

}

/**

* 类似数组的 find

* @param fn

*/

find(fn: (node: Node, index: number) => boolean) {

return Node.create(

this[nodeChildrenSymbol].find((item: InnerNode<NodeSchema>, index: number) => {

return fn(Node.create(item)!, index);

}),

);

}

/**

* 类似数组的 reduce

* @param fn

*/

reduce(fn: (acc: any, cur: Node) => any, initialValue: any) {

return this[nodeChildrenSymbol].reduce((acc: any, cur: InnerNode) => {

return fn(acc, Node.create(cur)!);

}, initialValue);

}

/**

* 导入 schema

* @param data

*/

importSchema(data?: NodeData | NodeData[]) {

this[nodeChildrenSymbol].import(data);

}

/**

* 导出 schema

* @param stage

* @returns

*/

exportSchema(stage: TransformStage = TransformStage.Render) {

return this[nodeChildrenSymbol].export(stage);

}

/**

* 执行新增、删除、排序等操作

* @param remover

* @param adder

* @param sorter

*/

mergeChildren(

remover: (node: Node, idx: number) => boolean,

adder: (children: Node[]) => any,

sorter: (firstNode: Node, secondNode: Node) => number,

) {

if (!sorter) {

sorter = () => 0;

}

this[nodeChildrenSymbol].mergeChildren(

(node: InnerNode, idx: number) => remover(Node.create(node)!, idx),

(children: InnerNode[]) => adder(children.map((node) => Node.create(node)!)),

(firstNode: InnerNode, secondNode: InnerNode) =>

sorter(Node.create(firstNode)!, Node.create(secondNode)!),

);

}

}