# All files / src/app/ceph/dashboard/health-pie health-pie.component.ts

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72.73% Branches 8/11
52.94% Functions 9/17
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     import {
      Component,
      ElementRef,
      EventEmitter,
      Input,
      OnChanges,
      OnInit,
      Output,
      ViewChild
    } from '@angular/core';

    import * as Chart from 'chart.js';
    import * as _ from 'lodash';

    import { ChartTooltip } from '../../../shared/models/chart-tooltip';
    import { DimlessBinaryPipe } from '../../../shared/pipes/dimless-binary.pipe';
    import { HealthPieColor } from './health-pie-color.enum';

    @Component({
      selector: 'cd-health-pie',
      template: require('./health-pie.component.html'),
      styles: []
    })
    export class HealthPieComponent implements OnChanges, OnInit {
      @ViewChild('chartCanvas')
      chartCanvasRef: ElementRef;
      @ViewChild('chartTooltip')
      chartTooltipRef: ElementRef;

      @Input()
      data: any;
      @Input()
      chartType: string;
      @Input()
      isBytesData = false;
      @Input()
      displayLegend = false;
      @Input()
      tooltipFn: any;
      @Output()
      prepareFn = new EventEmitter();

      chartConfig: any = {
        dataset: [
          {
            label: null,
            borderWidth: 0
          }
        ],
        options: {
          legend: {
            display: false,
            position: 'right',
            labels: { usePointStyle: true },
            onClick: (event, legendItem) => {
              this.onLegendClick(event, legendItem);
            }
          },
          animation: { duration: 0 },

          tooltips: {
            enabled: false
          }
        }
      };
      private hiddenSlices = [];

      constructor(private dimlessBinary: DimlessBinaryPipe) {}

      ngOnInit() {
        // An extension to Chart.js to enable rendering some
        // text in the middle of a doughnut
        Chart.pluginService.register({
          beforeDraw: function(chart) {
            if (!chart.options.center_text) {
              return;
            }

            const width = chart.chart.width,
              height = chart.chart.height,
              ctx = chart.chart.ctx;

            ctx.restore();
            const fontSize = (height / 114).toFixed(2);
            ctx.font = fontSize + 'em sans-serif';
            ctx.textBaseline = 'middle';

            const text = chart.options.center_text,
              textX = Math.round((width - ctx.measureText(text).width) / 2),
              textY = height / 2;

            ctx.fillText(text, textX, textY);
            ctx.save();
          }
        });

        const getStyleTop = (tooltip, positionY) => {
          return positionY + tooltip.caretY - tooltip.height - 10 + 'px';
        };

        const getStyleLeft = (tooltip, positionX) => {
          return positionX + tooltip.caretX + 'px';
        };

        const chartTooltip = new ChartTooltip(
          this.chartCanvasRef,
          this.chartTooltipRef,
          getStyleLeft,
          getStyleTop
        );

        const getBody = (body) => {
          return this.getChartTooltipBody(body);
        };

        chartTooltip.getBody = getBody;

        this.chartConfig.options.tooltips.custom = (tooltip) => {
          chartTooltip.customTooltips(tooltip);
        };

        this.setChartType();

        this.chartConfig.options.legend.display = this.displayLegend;

        this.chartConfig.colors = [
          {
            backgroundColor: [
              HealthPieColor.DEFAULT_RED,
              HealthPieColor.DEFAULT_BLUE,
              HealthPieColor.DEFAULT_ORANGE,
              HealthPieColor.DEFAULT_GREEN,
              HealthPieColor.DEFAULT_MAGENTA
            ]
          }
        ];

        this.prepareFn.emit([this.chartConfig, this.data]);
      }

      ngOnChanges() {
        this.prepareFn.emit([this.chartConfig, this.data]);
        this.hideSlices();
        this.setChartSliceBorderWidth();
      }

      private getChartTooltipBody(body) {
        const bodySplit = body[0].split(': ');

        if (this.isBytesData) {
          bodySplit[1] = this.dimlessBinary.transform(bodySplit[1]);
        }

        return bodySplit.join(': ');
      }

      private setChartType() {
        const chartTypes = ['doughnut', 'pie'];
        const selectedChartType = chartTypes.find((chartType) => chartType === this.chartType);

        if (selectedChartType !== undefined) {
          this.chartConfig.chartType = selectedChartType;
        } else {
          this.chartConfig.chartType = chartTypes[0];
        }
      }

      private setChartSliceBorderWidth() {
        let nonZeroValueSlices = 0;
        _.forEach(this.chartConfig.dataset[0].data, function(slice) {
          if (slice > 0) {
            nonZeroValueSlices += 1;
          }
        });

        this.chartConfig.dataset[0].borderWidth = nonZeroValueSlices > 1 ? 1 : 0;
      }

      private onLegendClick(event, legendItem) {
        event.stopPropagation();
        this.hiddenSlices[legendItem.index] = !legendItem.hidden;
        this.ngOnChanges();
      }

      private hideSlices() {
        _.forEach(this.chartConfig.dataset[0].data, (_slice, sliceIndex) => {
          if (this.hiddenSlices[sliceIndex]) {
            this.chartConfig.dataset[0].data[sliceIndex] = undefined;
          }
        });
      }
    }