import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/auth'
import { listDeckSummaries } from '@/lib/flashcards/deck-queries'
import { getOrCreateDeckForNotebook } from '@/lib/flashcards/deck-utils'

export async function GET() {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const decks = await listDeckSummaries(session.user.id)
    return NextResponse.json({ decks })
  } catch (error) {
    console.error('[flashcards/decks GET]', error)
    return NextResponse.json({ error: 'Failed to load decks' }, { status: 500 })
  }
}

export async function POST(request: NextRequest) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const body = await request.json()
    const name = typeof body.name === 'string' ? body.name.trim() : ''
    if (!name) {
      return NextResponse.json({ error: 'Name required' }, { status: 400 })
    }

    const deck = await getOrCreateDeckForNotebook({
      userId: session.user.id,
      notebookId: null,
      manualName: name,
    })

    return NextResponse.json({
      deck: {
        id: deck.id,
        name: deck.name,
        notebookId: deck.notebookId,
      },
    })
  } catch (error) {
    console.error('[flashcards/decks POST]', error)
    return NextResponse.json({ error: 'Failed to create deck' }, { status: 500 })
  }
}