Create stacked pools historical hashrates to see dominance over time

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

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+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';
+import { poolsColor } from 'src/app/app.constants';
+
+@Component({
+  selector: 'app-hashrate-chart-pools',
+  templateUrl: './hashrate-chart-pools.component.html',
+  styleUrls: ['./hashrate-chart-pools.component.scss'],
+  styles: [`
+    .loadingGraphs {
+      position: absolute;
+      top: 38%;
+      left: calc(50% - 15px);
+      z-index: 100;
+    }
+  `],
+})
+export class HashrateChartPoolsComponent implements OnInit {
+  @Input() widget: boolean = false;
+  @Input() right: number | string = 40;
+  @Input() left: number | string = 25;
+
+  radioGroupForm: FormGroup;
+
+  chartOptions: EChartsOption = {};
+  chartInitOptions = {
+    renderer: 'svg',
+    width: 'auto',
+    height: 'auto',
+  };
+
+  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-difficulty:Hashrate and Difficulty`);
+    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.getHistoricalPoolsHashrate$(timespan)
+            .pipe(
+              tap((data: any) => {
+                const grouped = {};
+                for (const hashrate of data.hashrates) {
+                  if (!grouped.hasOwnProperty(hashrate.poolName)) {
+                    grouped[hashrate.poolName] = [];
+                  }
+                  grouped[hashrate.poolName].push(hashrate);
+                }
+
+                const series = [];
+                const legends = [];
+
+                for (const name in grouped) {
+                  series.push({
+                    stack: 'Total',
+                    name: name,
+                    showSymbol: false,
+                    data: grouped[name].map((val) => [val.timestamp * 1000, (val.share * 100).toFixed(2)]),
+                    type: 'line',
+                    lineStyle: {
+                      width: 0,
+                    },
+                    areaStyle: {
+                      opacity: 1,
+                    },
+                    smooth: true,
+                    color: poolsColor[name.replace(/[^a-zA-Z0-9]/g, "").toLowerCase()],
+                    emphasis: {
+                      disabled: true,
+                      scale: false,
+                    },
+                  });
+
+                  legends.push({
+                    name: name,
+                    inactiveColor: 'rgb(110, 112, 121)',
+                    textStyle: {
+                      color: 'white',
+                    },
+                    icon: 'roundRect',
+                    itemStyle: {
+                      color: poolsColor[name.replace(/[^a-zA-Z0-9]/g, "").toLowerCase()],
+                    },
+                  });
+                }
+
+                this.prepareChartOptions({
+                  legends: legends,
+                  series: series
+                });
+                this.isLoading = false;
+              }),
+              map((data: any) => {
+                const availableTimespanDay = (
+                  (new Date().getTime() / 1000) - (data.oldestIndexedBlockTimestamp)
+                ) / 3600 / 24;
+                return {
+                  availableTimespanDay: availableTimespanDay,
+                  hashrates: data
+                };
+              }),
+            );
+        }),
+        share()
+      );
+  }
+
+  prepareChartOptions(data) {
+    this.chartOptions = {
+      grid: {
+        right: this.right,
+        left: this.left,
+        bottom: this.widget ? 30 : 60,
+        top: this.widget ? 10 : 40,
+      },
+      tooltip: {
+        trigger: 'axis',
+        axisPointer: {
+          type: 'line'
+        },
+        backgroundColor: 'rgba(17, 19, 31, 1)',
+        borderRadius: 4,
+        shadowColor: 'rgba(0, 0, 0, 0.5)',
+        textStyle: {
+          color: '#b1b1b1',
+          align: 'left',
+        },
+        borderColor: '#000',
+        formatter: function (data) {
+          let tooltip = `<b style="color: white; margin-left: 18px">${data[0].axisValueLabel}</b><br>`;
+          data.sort((a, b) => b.data[1] - a.data[1]);
+          for (const pool of data) {
+            if (pool.data[1] > 0) {
+              tooltip += `${pool.marker} ${pool.seriesName}: ${pool.data[1]}%<br>`
+            }
+          }
+          return tooltip;
+        }.bind(this)
+      },
+      xAxis: {
+        type: 'time',
+        splitNumber: (this.isMobile() || this.widget) ? 5 : 10,
+      },
+      legend: (this.isMobile() || this.widget) ? undefined : {
+        data: data.legends
+      },
+      yAxis: {
+        position: 'right',
+        axisLabel: {
+          color: 'rgb(110, 112, 121)',
+          formatter: (val) => `${val}%`,
+        },
+        splitLine: {
+          show: false,
+        },
+        type: 'value',
+        max: 100,
+        min: 0,
+      },
+      series: data.series,
+    };
+  }
+
+  isMobile() {
+    return (window.innerWidth <= 767.98);
+  }
+}