import Node from './node';
import { getNodeKey } from './util';

export default class TreeStore {
  constructor(options) {
    this.currentNode = null;
    this.currentNodeKey = null;

    for (let option in options) {
      if (options.hasOwnProperty(option)) {
        this[option] = options[option];
      }
    }

    this.nodesMap = {};

    this.root = new Node({
      data: this.data,
      store: this
    });

    if (this.lazy && this.load) {
      const loadFn = this.load;
      loadFn(this.root, (data) => {
        this.root.doCreateChildren(data);
        this._initDefaultCheckedNodes();
      });
    } else {
      this._initDefaultCheckedNodes();
    }
  }

  filter(value) {
    const filterNodeMethod = this.filterNodeMethod;
    const traverse = function(node) {
      const childNodes = node.root ? node.root.childNodes : node.childNodes;

      childNodes.forEach((child) => {
        child.visible = filterNodeMethod.call(child, value, child.data, child);

        traverse(child);
      });

      if (!node.visible && childNodes.length) {
        let allHidden = true;

        childNodes.forEach((child) => {
          if (child.visible) allHidden = false;
        });

        if (node.root) {
          node.root.visible = allHidden === false;
        } else {
          node.visible = allHidden === false;
        }
      }

      if (node.visible && !node.isLeaf) node.expand();
    };

    traverse(this);
  }

  setData(newVal) {
    const instanceChanged = newVal !== this.root.data;
    this.root.setData(newVal);
    if (instanceChanged) {
      this._initDefaultCheckedNodes();
    }
  }

  getNode(data) {
    const key = typeof data !== 'object' ? data : getNodeKey(this.key, data);
    return this.nodesMap[key];
  }

  insertBefore(data, refData) {
    const refNode = this.getNode(refData);
    refNode.parent.insertBefore({ data }, refNode);
  }

  insertAfter(data, refData) {
    const refNode = this.getNode(refData);
    refNode.parent.insertAfter({ data }, refNode);
  }

  remove(data) {
    const node = this.getNode(data);
    if (node) {
      node.parent.removeChild(node);
    }
  }

  append(data, parentData) {
    const parentNode = parentData ? this.getNode(parentData) : this.root;

    if (parentNode) {
      parentNode.insertChild({ data });
    }
  }

  _initDefaultCheckedNodes() {
    const defaultCheckedKeys = this.defaultCheckedKeys || [];
    const nodesMap = this.nodesMap;

    defaultCheckedKeys.forEach((checkedKey) => {
      const node = nodesMap[checkedKey];

      if (node) {
        node.setChecked(true, !this.checkStrictly);
      }
    });
  }

  _initDefaultCheckedNode(node) {
    const defaultCheckedKeys = this.defaultCheckedKeys || [];

    if (defaultCheckedKeys.indexOf(node.key) !== -1) {
      node.setChecked(true, !this.checkStrictly);
    }
  }

  setDefaultCheckedKey(newVal) {
    if (newVal !== this.defaultCheckedKeys) {
      this.defaultCheckedKeys = newVal;
      this._initDefaultCheckedNodes();
    }
  }

  registerNode(node) {
    const key = this.key;
    if (!key || !node || !node.data) return;

    const nodeKey = node.key;
    if (nodeKey !== undefined) this.nodesMap[node.key] = node;
  }

  deregisterNode(node) {
    const key = this.key;
    if (!key || !node || !node.data) return;

    delete this.nodesMap[node.key];
  }

  getCheckedNodes(leafOnly = false) {
    const checkedNodes = [];
    const traverse = function(node) {
      const childNodes = node.root ? node.root.childNodes : node.childNodes;

      childNodes.forEach((child) => {
        if ((!leafOnly && child.checked) || (leafOnly && child.isLeaf && child.checked)) {
          checkedNodes.push(child.data);
        }

        traverse(child);
      });
    };

    traverse(this);

    return checkedNodes;
  }

  getCheckedKeys(leafOnly = false) {
    const key = this.key;
    const allNodes = this._getAllNodes();
    const keys = [];
    allNodes.forEach((node) => {
      if (!leafOnly || (leafOnly && node.isLeaf)) {
        if (node.checked) {
          keys.push((node.data || {})[key]);
        }
      }
    });
    return keys;
  }

  _getAllNodes() {
    const allNodes = [];
    const nodesMap = this.nodesMap;
    for (let nodeKey in nodesMap) {
      if (nodesMap.hasOwnProperty(nodeKey)) {
        allNodes.push(nodesMap[nodeKey]);
      }
    }

    return allNodes;
  }

  _setCheckedKeys(key, leafOnly = false, checkedKeys) {
    const allNodes = this._getAllNodes().sort((a, b) => b.level - a.level);
    const cache = Object.create(null);
    const keys = Object.keys(checkedKeys);
    allNodes.forEach(node => node.setChecked(false, false));
    for (let i = 0, j = allNodes.length; i < j; i++) {
      const node = allNodes[i];
      const nodeKey = node.data[key].toString();
      let checked = keys.indexOf(nodeKey) > -1;
      if (!checked) {
        if (node.checked && !cache[nodeKey]) {
          node.setChecked(false, false);
        }
        continue;
      }

      let parent = node.parent;
      while (parent && parent.level > 0) {
        cache[parent.data[key]] = true;
        parent = parent.parent;
      }

      if (node.isLeaf || this.checkStrictly) {
        node.setChecked(true, false);
        continue;
      }
      node.setChecked(true, true);

      if (leafOnly) {
        node.setChecked(false, false);
        const traverse = function(node) {
          const childNodes = node.childNodes;
          childNodes.forEach((child) => {
            if (!child.isLeaf) {
              child.setChecked(false, false);
            }
            traverse(child);
          });
        };
        traverse(node);
      }
    }
  }

  setCheckedNodes(array, leafOnly = false) {
    const key = this.key;
    const checkedKeys = {};
    array.forEach((item) => {
      checkedKeys[(item || {})[key]] = true;
    });

    this._setCheckedKeys(key, leafOnly, checkedKeys);
  }

  setCheckedKeys(keys, leafOnly = false) {
    this.defaultCheckedKeys = keys;
    const key = this.key;
    const checkedKeys = {};
    keys.forEach((key) => {
      checkedKeys[key] = true;
    });

    this._setCheckedKeys(key, leafOnly, checkedKeys);
  }

  setDefaultExpandedKeys(keys) {
    keys = keys || [];
    this.defaultExpandedKeys = keys;

    keys.forEach((key) => {
      const node = this.getNode(key);
      if (node) node.expand(null, this.autoExpandParent);
    });
  }

  setChecked(data, checked, deep) {
    const node = this.getNode(data);

    if (node) {
      node.setChecked(!!checked, deep);
    }
  }

  getCurrentNode() {
    return this.currentNode;
  }

  setCurrentNode(node) {
    this.currentNode = node;
  }

  setCurrentNodeKey(key) {
    const node = this.getNode(key);
    if (node) {
      this.currentNode = node;
    }
  }
};
