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

export async function POST(request: NextRequest) {
  try {
    const user = await requireAuth()

    const previousSongId = await getPreviousInQueue(user.id)
    if (!previousSongId) {
      return NextResponse.json(
        { error: 'No previous song in queue' },
        { status: 404 }
      )
    }

    await playSong(user.id, previousSongId, 'queue')

    return NextResponse.json(
      { message: 'Playing previous song', songId: previousSongId },
      { status: 200 }
    )
  } catch (error) {
    console.error('Previous song error:', error)
    if (error instanceof Error && error.message === 'Unauthorized') {
      return NextResponse.json(
        { error: 'Unauthorized' },
        { status: 401 }
      )
    }
    return NextResponse.json(
      { error: 'Failed to play previous song' },
      { status: 500 }
    )
  }
}