import { Injectable, Logger } from '@nestjs/common';
import { Interval } from '@nestjs/schedule';
import { PrismaService } from '../prisma/prisma.service';
import { NowPlayingService } from './now-playing.service';

interface Radio101Resp {
  result?: {
    short?: {
      titleTrack?: string;
      titleExecutorFull?: string;
      cover?: { coverOriginal?: string };
    };
  };
}

/**
 * Now-playing для станций на платформе 101.ru (Comedy Radio, Радио Energy/NRJ).
 * Потоки pub*.101.ru/stream/.../{channelId} — id канала = последний сегмент.
 * Трек: `https://101.ru/api/channel/getTrackOnAir/{id}/?dataFormat=json&idcity=1`
 * → result.short {titleExecutorFull, titleTrack, cover.coverOriginal}. Обложка —
 * cdn0.101.ru + coverOriginal. (Comedy: «комик - реприза» — это их «в эфире».)
 */
@Injectable()
export class Radio101NowPlayingService {
  private readonly logger = new Logger(Radio101NowPlayingService.name);
  private readonly coverBase = 'https://cdn0.101.ru';
  private readonly headers = { 'User-Agent': 'Mozilla/5.0' };

  constructor(
    private readonly prisma: PrismaService,
    private readonly nowPlayingService: NowPlayingService,
  ) {}

  @Interval(30000)
  async pollRadio101NowPlaying() {
    const stations = await this.prisma.station.findMany({
      where: { streamUrl: { contains: '.101.ru' } },
    });
    if (stations.length === 0) return;

    let updated = 0;
    await Promise.allSettled(
      stations.map(async (station) => {
        const id = this.extractChannelId(station.streamUrl);
        if (!id) return;

        const res = await fetch(
          `https://101.ru/api/channel/getTrackOnAir/${id}/?dataFormat=json&idcity=1`,
          { headers: this.headers, redirect: 'follow' },
        );
        if (!res.ok) return;
        const short = ((await res.json()) as Radio101Resp).result?.short;
        const artist = (short?.titleExecutorFull ?? '').trim();
        const song = (short?.titleTrack ?? '').trim();
        if (!artist || !song) return;

        const coverPath = short?.cover?.coverOriginal;
        const coverUrl = coverPath ? this.coverBase + coverPath : null;

        await this.nowPlayingService.ingest({
          stationDbId: station.id,
          stationNumericId: station.stationId,
          artist,
          song,
          coverUrl,
        });
        if (!station.isOnline) {
          await this.prisma.station.update({
            where: { id: station.id },
            data: { isOnline: true },
          });
        }
        updated++;
      }),
    );
    this.logger.log(`Radio101 poll: ${updated}/${stations.length} обновлено`);
  }

  // https://pub0302.101.ru:8000/stream/pro/aac/64/446 → 446
  private extractChannelId(streamUrl: string): string | null {
    const m = streamUrl.match(/\/(\d+)\/?$/);
    return m ? m[1] : null;
  }
}