/**
 * Suno music backend — wraps the existing generateMusic() from
 * src/video/assemble/music.ts (Kie.ai Suno provider).
 *
 * This backend delegates entirely to the proven assemble-layer
 * implementation; it does NOT re-implement any transport logic.
 * Availability: requires KIE_API_KEY in env.
 */

import { generateMusic } from '../assemble/music.js';
import type { MusicBackend, MusicGenInput, MusicGenResult } from './types.js';

export const sunoBackend: MusicBackend = {
  id: 'suno',
  kind: 'music',
  displayName: 'Suno (Kie.ai)',
  requiredEnv: ['KIE_API_KEY'],
  summary: 'Background-music generation via Kie.ai Suno V5 (submit → poll → download). Requires KIE_API_KEY.',

  async generate(input: MusicGenInput): Promise<MusicGenResult> {
    const env = input.env ?? process.env;
    const result = await generateMusic({
      prompt: input.prompt,
      durationSec: input.durationSec,
      outputPath: input.outputPath,
      dryRun: input.dryRun,
      apiKey: env['KIE_API_KEY'],
      ...(input.fetcher ? { fetcher: input.fetcher } : {}),
    });
    return {
      path: result.path,
      durationMs: result.durationMs,
      backendId: 'suno',
    };
  },
};