Added hashrate chart

frontend/src/app/components/hashrate-chart/hashrate-chart.component.ts

@@ -1,15 +1,173 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, Inject, Input, LOCALE_ID, OnInit } from '@angular/core';
+import { EChartsOption } from 'echarts';
+import { Observable } from 'rxjs';
+import { map, share, startWith, switchMap, tap } from 'rxjs/operators';
+import { ApiService } from 'src/app/services/api.service';
+import { SeoService } from 'src/app/services/seo.service';
+import { formatNumber } from '@angular/common';
+import { FormBuilder, FormGroup } from '@angular/forms';
 
 @Component({
   selector: 'app-hashrate-chart',
   templateUrl: './hashrate-chart.component.html',
-  styleUrls: ['./hashrate-chart.component.scss']
+  styleUrls: ['./hashrate-chart.component.scss'],
+  styles: [`
+    .loadingGraphs {
+      position: absolute;
+      top: 38%;
+      left: calc(50% - 15px);
+      z-index: 100;
+    }
+  `],
 })
 export class HashrateChartComponent implements OnInit {
+  @Input() widget: boolean = false;
 
-  constructor() { }
+  radioGroupForm: FormGroup;
 
-  ngOnInit(): void {
+  chartOptions: EChartsOption = {};
+  chartInitOptions = {
+    renderer: 'svg'
+  };
+
+  hashrateObservable$: Observable<any>;
+  isLoading = true;
+  formatNumber = formatNumber;
+
+  constructor(
+    @Inject(LOCALE_ID) public locale: string,
+    private seoService: SeoService,
+    private apiService: ApiService,
+    private formBuilder: FormBuilder,
+  ) {
+    this.seoService.setTitle($localize`:@@mining.hashrate:hashrate`);
+    this.radioGroupForm = this.formBuilder.group({ dateSpan: '1y' });
+    this.radioGroupForm.controls.dateSpan.setValue('1y');
   }
 
+  ngOnInit(): void {
+    this.hashrateObservable$ = this.radioGroupForm.get('dateSpan').valueChanges
+      .pipe(
+        startWith('1y'),
+        switchMap((timespan) => {
+          return this.apiService.getHistoricalHashrate$(timespan)
+            .pipe(
+              tap(data => {
+                this.prepareChartOptions(data.hashrates.map(val => [val.timestamp * 1000, val.avgHashrate]));
+                this.isLoading = false;
+              }),
+              map(data => {
+                const availableTimespanDay = (
+                  (new Date().getTime() / 1000) - (data.oldestIndexedBlockTimestamp / 1000)
+                ) / 3600 / 24;
+                return {
+                  availableTimespanDay: availableTimespanDay,
+                  data: data.hashrates
+                };
+              }),
+            );
+          }),
+          share()
+        );
+  }
+
+  prepareChartOptions(data) {
+    this.chartOptions = {
+      title: {
+        text: this.widget? '' : $localize`:@@mining.hashrate:Hashrate`,
+        left: 'center',
+        textStyle: {
+          color: '#FFF',
+        },
+      },
+      tooltip: {
+        show: true,
+        trigger: 'axis',
+      },
+      axisPointer: {
+        type: 'line',
+      },
+      xAxis: {
+        type: 'time',
+        splitNumber: this.isMobile() ? 5 : 10,
+      },
+      yAxis: {
+        type: 'value',
+        axisLabel: {
+          formatter: (val) => {
+            const powerOfTen = {
+              exa: Math.pow(10, 18),
+              peta: Math.pow(10, 15),
+              terra: Math.pow(10, 12),
+              giga: Math.pow(10, 9),
+              mega: Math.pow(10, 6),
+              kilo: Math.pow(10, 3),
+            }
+
+            let selectedPowerOfTen = { divider: powerOfTen.exa, unit: 'E' };
+            if (val < powerOfTen.mega) {
+              selectedPowerOfTen = { divider: 1, unit: '' }; // no scaling
+            } else if (val < powerOfTen.giga) {
+              selectedPowerOfTen = { divider: powerOfTen.mega, unit: 'M' };
+            } else if (val < powerOfTen.terra) {
+              selectedPowerOfTen = { divider: powerOfTen.giga, unit: 'G' };
+            } else if (val < powerOfTen.peta) {
+              selectedPowerOfTen = { divider: powerOfTen.terra, unit: 'T' };
+            } else if (val < powerOfTen.exa) {
+              selectedPowerOfTen = { divider: powerOfTen.peta, unit: 'P' };
+            }
+
+            const newVal = val / selectedPowerOfTen.divider;
+            return `${newVal} ${selectedPowerOfTen.unit}`
+          }
+        },
+        splitLine: {
+          lineStyle: {
+            type: 'dotted',
+            color: '#ffffff66',
+            opacity: 0.25,
+          }
+        },
+      },
+      series: {
+        showSymbol: false,
+        data: data,
+        type: 'line',
+        smooth: false,
+        lineStyle: {
+          width: 3,
+        },
+        areaStyle: {},
+      },
+      dataZoom: this.widget ? null : [{
+        type: 'inside',
+        realtime: true,
+        zoomLock: true,
+        zoomOnMouseWheel: true,
+        moveOnMouseMove: true,
+        maxSpan: 100,
+        minSpan: 10,
+      }, {
+        showDetail: false,
+        show: true,
+        type: 'slider',
+        brushSelect: false,
+        realtime: true,
+        bottom: 0,
+        selectedDataBackground: {
+          lineStyle: {
+            color: '#fff',
+            opacity: 0.45,
+          },
+          areaStyle: {
+            opacity: 0,
+          }
+        },
+      }],
+    };
+  }
+
+  isMobile() {
+    return (window.innerWidth <= 767.98);
+  }
 }