# All files / src/app/shared/datatable/table-key-value table-key-value.component.ts

97.53% Statements 79/81
95% Branches 19/20
100% Functions 20/20
96.88% Lines 62/64

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     import {
      Component,
      EventEmitter,
      Input,
      OnChanges,
      OnInit,
      Output,
      ViewChild
    } from '@angular/core';

    import * as _ from 'lodash';

    import { CellTemplate } from '../../enum/cell-template.enum';
    import { CdTableColumn } from '../../models/cd-table-column';
    import { TableComponent } from '../table/table.component';

    class Item {
      key: string;
      value: any;
    }

    /**
     * Display the given data in a 2 column data table. The left column
     * shows the 'key' attribute, the right column the 'value' attribute.
     * The data table has the following characteristics:
     * - No header and footer is displayed
     * - The relation of the width for the columns 'key' and 'value' is 1:3
     * - The 'key' column is displayed in bold text
     */
    @Component({
      selector: 'cd-table-key-value',
      template: require('./table-key-value.component.html'),
      styles: []
    })
    export class TableKeyValueComponent implements OnInit, OnChanges {
      @ViewChild(TableComponent)
      table: TableComponent;

      @Input()
      data: any;
      @Input()
      autoReload: any = 5000;
      @Input()
      renderObjects = false;
      // Only used if objects are rendered
      @Input()
      appendParentKey = true;
      @Input()
      hideEmpty = false;

      // If set, the classAddingTpl is used to enable different css for different values
      @Input()
      customCss?: { [css: string]: number | string | ((any) => boolean) };

      columns: Array<CdTableColumn> = [];
      tableData: Item[];

      /**
       * The function that will be called to update the input data.
       */
      @Output()
      fetchData = new EventEmitter();

      constructor() {}

      ngOnInit() {
        this.columns = [
          {
            prop: 'key',
            flexGrow: 1,
            cellTransformation: CellTemplate.bold
          },
          {
            prop: 'value',
            flexGrow: 3
          }
        ];
        if (this.customCss) {
          this.columns[1].cellTransformation = CellTemplate.classAdding;
        }
        // We need to subscribe the 'fetchData' event here and not in the
        // HTML template, otherwise the data table will display the loading
        // indicator infinitely if data is only bound via '[data]="xyz"'.
        // See for 'loadingIndicator' in 'TableComponent::ngOnInit()'.
        if (this.fetchData.observers.length > 0) {
          this.table.fetchData.subscribe(() => {
            // Forward event triggered by the 'cd-table' data table.
            this.fetchData.emit();
          });
        }
        this.useData();
      }

      ngOnChanges() {
        this.useData();
      }

      useData() {
        if (!this.data) {
          return; // Wait for data
        }
        this.tableData = this._makePairs(this.data);
      }

      _makePairs(data: any): Item[] {
        let temp = [];
        if (!data) {
          return; // Wait for data
        } else if (_.isArray(data)) {
          temp = this._makePairsFromArray(data);
        } else if (_.isObject(data)) {
          temp = this._makePairsFromObject(data);
        } else {
          throw new Error('Wrong data format');
        }
        temp = temp.map((v) => this._convertValue(v)).filter((o) => o); // Filters out undefined
        return _.sortBy(this.renderObjects ? this.insertFlattenObjects(temp) : temp, 'key');
      }

      _makePairsFromArray(data: any[]): Item[] {
        let temp = [];
        const first = data[0];
        if (_.isArray(first)) {
          if (first.length === 2) {
            temp = data.map((a) => ({
              key: a[0],
              value: a[1]
            }));
          } else {
            throw new Error('Wrong array format: [string, any][]');
          }
        } else if (_.isObject(first)) {
          if (_.has(first, 'key') && _.has(first, 'value')) {
            temp = [...data];
          } else {
            temp = data.reduce(
              (previous: any[], item) => previous.concat(this._makePairsFromObject(item)),
              temp
            );
          }
        }
        return temp;
      }

      _makePairsFromObject(data: object): Item[] {
        return Object.keys(data).map((k) => ({
          key: k,
          value: data[k]
        }));
      }

      private insertFlattenObjects(temp: Item[]): any[] {
        return _.flattenDeep(
          temp.map((item) => {
            const value = item.value;
            const isObject = _.isObject(value);
            if (!isObject || _.isEmpty(value)) {
              if (isObject) {
                item.value = '';
              }
              return item;
            }
            return this.splitItemIntoItems(item);
          })
        );
      }

      /**
       * Split item into items will call _makePairs inside _makePairs (recursion), in oder to split
       * the object item up into items as planned.
       */
      private splitItemIntoItems(v: { key: string; value: object }): Item[] {
        return this._makePairs(v.value).map((item) => {
          if (this.appendParentKey) {
            item.key = v.key + ' ' + item.key;
          }
          return item;
        });
      }

      _convertValue(v: Item): Item {
        if (_.isArray(v.value)) {
          v.value = v.value.map((item) => (_.isObject(item) ? JSON.stringify(item) : item)).join(', ');
        }
        const isEmpty = _.isEmpty(v.value) && !_.isNumber(v.value);
        if ((this.hideEmpty && isEmpty) || (_.isObject(v.value) && !this.renderObjects)) {
          return;
        } else if (isEmpty && !this.hideEmpty && v.value !== '') {
          v.value = '';
        }
        return v;
      }
    }