import { markNodeData, NODE_KEY } from './util';
import objectAssign from './merge';

const getPropertyFromData = function (node, prop) {
  const props = node.store.props;
  const data = node.data || {};
  const config = props[prop];

  if (typeof config === 'function') {
    return config(data, node);
  } else if (typeof config === 'string') {
    return data[config];
  } else if (typeof config === 'undefined') {
    const dataProp = data[prop];
    return dataProp === undefined ? '' : dataProp;
  }
};

let nodeIdSeed = 0;

export default class Node {
  constructor(options, isLeftChild = false) {
    this.isLeftChild = isLeftChild;
    this.id = nodeIdSeed++;
    this.data = null;
    this.expanded = false;
    this.leftExpanded = false;
    this.isCurrent = false;
    this.visible = true;
    this.parent = null;
    for (let name in options) {
      if (options.hasOwnProperty(name)) {
        this[name] = options[name];
      }
    }
    this.level = 0;
    this.childNodes = [];
    this.leftChildNodes = [];

    if (this.parent) {
      this.level = this.parent.level + 1;
    }

    const store = this.store;
    if (!store) {
      throw new Error('[Node]store is required!');
    }
    store.registerNode(this);
    if (this.data) {
      this.setData(this.data, isLeftChild);
      if (store.defaultExpandAll || !store.showCollapsable) {
        this.expanded = true;
        this.leftExpanded = true;
      }
    }

    if (!Array.isArray(this.data)) {
      markNodeData(this, this.data);
    }
    if (!this.data) return;
    const defaultExpandedKeys = store.defaultExpandedKeys;
    const key = store.key;
    if (
      key &&
      defaultExpandedKeys &&
      defaultExpandedKeys.indexOf(this.key) !== -1
    ) {
      this.expand(null, true);
    }

    if (
      key &&
      store.currentNodeKey !== undefined &&
      this.key === store.currentNodeKey
    ) {
      store.currentNode = this;
      store.currentNode.isCurrent = true;
    }

    this.updateLeafState();
  }

  setData(data, isLeftChild) {
    if (!Array.isArray(data)) {
      markNodeData(this, data);
    }
    const store = this.store;
    this.data = data;
    this.childNodes = [];
    let children;
    if (this.level === 0 && this.data instanceof Array) {
      children = this.data;
    } else {
      children = getPropertyFromData(this, 'children') || [];
    }
    for (let i = 0, j = children.length; i < j; i++) {
      this.insertChild({ data: children[i] }, null, null, isLeftChild);
    }
  }
  get key() {
    const nodeKey = this.store.key;
    if (this.data) return this.data[nodeKey];
    return null;
  }
  get label() {
    return getPropertyFromData(this, 'label');
  }
  // 是否是 OKR 飞书模式
  hasLeftChild() {
    const store = this.store;
    return store.onlyBothTree && store.direction === 'horizontal';
  }
  insertChild(child, index, batch, isLeftChild) {
    if (!child) throw new Error('insertChild error: child is required.');
    if (!(child instanceof Node)) {
      if (!batch) {
        const children = this.getChildren(true);
        if (children.indexOf(child.data) === -1) {
          if (index === undefined || index === null || index < 0) {
            children.push(child.data);
          } else {
            children.splice(index, 0, child.data);
          }
        }
      }
      objectAssign(child, {
        parent: this,
        store: this.store,
      });
      child = new Node(child, isLeftChild);
    }
    child.level = this.level + 1;
    if (index === undefined || index === null || index < 0) {
      this.childNodes.push(child);
    } else {
      this.childNodes.splice(index, 0, child);
    }
    this.updateLeafState();
  }
  getChildren(forceInit = false) {
    // this is data
    if (this.level === 0) return this.data;
    const data = this.data;
    if (!data) return null;

    const props = this.store.props;
    let children = 'children';
    if (props) {
      children = props.children || 'children';
    }

    if (data[children] === undefined) {
      data[children] = null;
    }

    if (forceInit && !data[children]) {
      data[children] = [];
    }

    return data[children];
  }
  updateLeafState() {
    if (
      this.store.lazy === true &&
      this.loaded !== true &&
      typeof this.isLeafByUser !== 'undefined'
    ) {
      this.isLeaf = this.isLeafByUser;
      return;
    }
    const childNodes = this.childNodes;
    if (
      !this.store.lazy ||
      (this.store.lazy === true && this.loaded === true)
    ) {
      this.isLeaf = !childNodes || childNodes.length === 0;
      return;
    }
    this.isLeaf = false;
  }
  updateLeftLeafState() {
    if (
      this.store.lazy === true &&
      this.loaded !== true &&
      typeof this.isLeafByUser !== 'undefined'
    ) {
      this.isLeaf = this.isLeafByUser;
      return;
    }
    const childNodes = this.leftChildNodes;
    if (
      !this.store.lazy ||
      (this.store.lazy === true && this.loaded === true)
    ) {
      this.isLeaf = !childNodes || childNodes.length === 0;
      return;
    }
    this.isLeaf = false;
  }
  // 节点的收起
  collapse() {
    this.expanded = false;
  }
  // 节点的展开
  expand(callback, expandParent) {
    const done = () => {
      if (expandParent) {
        let parent = this.parent;
        while (parent.level > 0) {
          parent.isLeftChild
            ? (parent.leftExpanded = true)
            : (parent.expanded = true);
          parent = parent.parent;
        }
      }
      this.isLeftChild ? (this.leftExpanded = true) : (this.expanded = true);
      if (callback) callback();
    };
    done();
  }

  removeChild(child) {
    const children = this.getChildren() || [];
    const dataIndex = children.indexOf(child.data);
    if (dataIndex > -1) {
      children.splice(dataIndex, 1);
    }

    const index = this.childNodes.indexOf(child);

    if (index > -1) {
      this.store && this.store.deregisterNode(child);
      child.parent = null;
      this.childNodes.splice(index, 1);
    }

    this.updateLeafState();
  }
  insertBefore(child, ref) {
    let index;
    if (ref) {
      index = this.childNodes.indexOf(ref);
    }
    this.insertChild(child, index);
  }
  insertAfter(child, ref) {
    let index;
    if (ref) {
      index = this.childNodes.indexOf(ref);
      if (index !== -1) index += 1;
    }
    this.insertChild(child, index);
  }
}