/*-
 * ============LICENSE_START=======================================================
 * ONAP POLICY-CLAMP
 * ================================================================================
 * Copyright (C) 2021 AT&T Intellectual Property. All rights
 *                             reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END============================================
 * ===================================================================
 *
 */

import React, { forwardRef } from 'react'
import TreeView from '@material-ui/lab/TreeView';
import TreeItem from '@material-ui/lab/TreeItem';
import FolderIcon from '@material-ui/icons/Folder';
import FolderOpenIcon from '@material-ui/icons/FolderOpen';
import DescriptionIcon from '@material-ui/icons/Description';


export default class PoliciesTreeViewer extends React.Component {

  separator = ".";

  nodesList = new Map();

  constructor(props, context) {
    super(props, context);
    this.createPoliciesTree = this.createPoliciesTree.bind(this);
    this.handleTreeItemClick = this.handleTreeItemClick.bind(this);
    this.buildNameWithParent = this.buildNameWithParent.bind(this);

  }

  state = {
    policiesTreeData: this.createPoliciesTree(this.props.policiesData),
  }

  componentDidUpdate(prevProps) {
    if (prevProps.policiesData !== this.props.policiesData) {
      this.setState({ policiesTreeData: this.createPoliciesTree(this.props.policiesData) })
    }
  }

  createPoliciesTree(policiesArray) {
    // put my policies array in a Json
    let nodeId = 1;
    let root = { id: nodeId, policyCount: 0, name: "ROOT", children: [], parent: undefined };
    this.nodesList.set(nodeId++, root);

    policiesArray.forEach(policy => {
      let currentTreeNode = root;
      policy[this.props.valueForTreeCreation].split(this.separator).forEach((policyNamePart, index, policyNamePartsArray) => {
        let node = currentTreeNode["children"].find(element => element.name === policyNamePart);
        if (typeof (node) === "undefined") {
          node = { id: nodeId, policyCount: 0, children: [], name: policyNamePart, parent: currentTreeNode };
          this.nodesList.set(nodeId++, node);
          currentTreeNode["children"].push(node);
        }
        if ((index + 1) === policyNamePartsArray.length) {
          ++currentTreeNode["policyCount"];
        }
        currentTreeNode = node;
      })
    })
    return root;
  }

  buildNameWithParent(node) {
    let nameToBuild = node.name;
    if (node.parent !== undefined) {
      nameToBuild = this.buildNameWithParent(node.parent) + this.separator + node.name;
    }
    return nameToBuild;
  }

  handleTreeItemClick(event, value) {
    let fullName = this.buildNameWithParent(this.nodesList.get(value[0])).substring(5);
    this.props.policiesFilterFunction(fullName);
  }

  renderTreeItems(nodes) {
    return (<TreeItem key={ nodes.id } nodeId={ nodes.id } label={ nodes.name + "(" + nodes.policyCount + ")" } onNodeSelect={ this.handleTreeItemClick }>
      {
        Array.isArray(nodes.children) ? nodes.children.map((node) => this.renderTreeItems(node)) : null
      }
    </TreeItem>);
  };

  render() {
    return (
      <TreeView defaultExpanded={ ['root'] } defaultCollapseIcon={ <FolderOpenIcon/> }
                defaultExpandIcon={ <FolderIcon/> } defaultEndIcon={ <DescriptionIcon/> } onNodeSelect={ this.handleTreeItemClick } multiSelect>
        { this.renderTreeItems(this.state.policiesTreeData) }
      </TreeView>
    );
  }
}