import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'
import { requireAuth } from '@/lib/auth'
import { playSong, getNextInQueue } from '@/lib/player'

export async function POST(request: NextRequest) {
  try {
    const user = await requireAuth()
    const body = await request.json()
    const { songId } = body

    // If a specific songId is provided, play that song
    if (songId) {
      // Verify the song exists and is public
      const song = await prisma.song.findUnique({
        where: { id: songId },
        select: { id: true, isPublic: true, artistId: true },
      })

      if (!song) {
        return NextResponse.json(
          { error: 'Song not found' },
          { status: 404 }
        )
      }

      if (!song.isPublic && song.artistId !== user.id) {
        return NextResponse.json(
          { error: 'Cannot play this song' },
          { status: 403 }
        )
      }

      await playSong(user.id, songId, 'manual')
      return NextResponse.json(
        { message: 'Playing song', songId },
        { status: 200 }
      )
    }

    // If no songId, play next in queue
    const nextSongId = await getNextInQueue(user.id)
    if (!nextSongId) {
      return NextResponse.json(
        { error: 'No songs in queue' },
        { status: 404 }
      )
    }

    await playSong(user.id, nextSongId, 'queue')
    return NextResponse.json(
      { message: 'Playing next song in queue', songId: nextSongId },
      { status: 200 }
    )
  } catch (error) {
    console.error('Play error:', error)
    if (error instanceof Error && error.message === 'Unauthorized') {
      return NextResponse.json(
        { error: 'Unauthorized' },
        { status: 401 }
      )
    }
    return NextResponse.json(
      { error: 'Failed to play song' },
      { status: 500 }
    )
  }
}