/*-
 * ============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>
          );
    }
}