import { Injectable } from '@angular/core';
import { DataService, ChartFormatOptions } from '@vendure/admin-ui/core';
import { AdvancedMetricSummary, AdvancedMetricType } from './generated/graphql';
import { BehaviorSubject, Observable, combineLatest } from 'rxjs';
import { GET_METRICS } from './queries.graphql';
import { switchMap } from 'rxjs/operators';
import { ChartEntry } from './chartist/chartist.component';
export interface AdvancedChartEntry {
  label: string;
  value: number;
  formatOptions: ChartFormatOptions;
  code: string;
  name: string;
}
@Injectable({
  providedIn: 'root',
})
export class MetricsUiService {
  currencyCode$ = this.dataService.settings
    .getActiveChannel()
    .refetchOnChannelChange()
    .mapStream((data) => data.activeChannel.defaultCurrencyCode || undefined);
  uiState$ = this.dataService.client
    .uiState()
    .mapStream((data) => data.uiState);
  selectedVariantIds$ = new BehaviorSubject<string[]>([]);
  queryData$ = combineLatest([
    this.currencyCode$,
    this.uiState$,
    this.selectedVariantIds$,
  ]).pipe(
    switchMap(([currencyCode, uiState, selectedVariantIds]) =>
      this.dataService
        .query(GET_METRICS, {
          input: {
            ...(selectedVariantIds.length
              ? { variantIds: selectedVariantIds }
              : []),
          },
        })
        .refetchOnChannelChange()
        .mapStream((metricSummary: any) => {
          return this.toChartEntry(
            metricSummary.advancedMetricSummaries,
            `${uiState.language}-${uiState.locale}`,
            currencyCode
          );
        })
    )
  );

  constructor(private dataService: DataService) {}

  toChartEntry(
    input: AdvancedMetricSummary[],
    locale: string,
    currencyCode: string
  ): ChartEntry[] {
    return input.map((r) => {
      const formatValueAs: 'currency' | 'number' =
        r.type === AdvancedMetricType.Number ? 'number' : 'currency';
      const formatOptions: ChartFormatOptions = {
        formatValueAs,
        currencyCode,
        locale,
      };
      return {
        formatOptions,
        summary: r,
      };
    });
  }
}