import { Component, effect, inject } from '@angular/core';
import { AsyncPipe } from '@angular/common';
import { map, Observable, startWith } from 'rxjs';

import { ShowService } from '../services/show.service';
import { Show } from '../interfaces/show';
import { StationConfigService } from '../services/station-config.service';
import { StructuredDataService } from '../services/structured-data.service';
import { SortSchedulesPipe } from '../pipes/sort-schedules.pipe';
import { resolveImageUrl } from '../services/app-config.service';

interface ScheduleState {
  loading: boolean;
  shows: Show[];
}

@Component({
  selector: 'app-schedule',
  standalone: true,
  imports: [AsyncPipe, SortSchedulesPipe],
  templateUrl: './schedule.component.html',
  styleUrl: './schedule.component.scss',
})
export class ScheduleComponent {
  private showService = inject(ShowService);
  readonly config = inject(StationConfigService).config;
  private structuredData = inject(StructuredDataService);

  /** ID of the currently expanded show card — null means none. */
  expandedShowId: number | null = null;

  /** Toggle expansion: clicking the active card collapses it; clicking another expands it. */
  toggleShow(showId: number): void {
    this.expandedShowId = this.expandedShowId === showId ? null : showId;
  }

  /** Async pipe drives the template — guarantees change detection on every emission. */
  readonly schedule$: Observable<ScheduleState> =
    this.showService.getShows().pipe(
      map((shows) => ({ loading: false, shows })),
      startWith({ loading: true, shows: [] }),
    );

  /** Resolve a relative uploads/… path to an absolute URL for image rendering. */
  resolveAsset(url: string | null): string {
    return resolveImageUrl(url ?? '');
  }

  resolveImageUrl(url: string): string {
    return resolveImageUrl(url);
  }

  constructor() {
    // Feed active shows to structured data for RadioSeason schema injection.
    effect(() => {
      const snapshot = this.showService.getShows();
      snapshot.subscribe((shows) => {
        this.structuredData.activeShows.set(shows);
      });
    });
  }
}