import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/lib/auth'
import { prisma } from '@/lib/prisma'

type GenerateType = 'slide-generator' | 'excalidraw-generator'

const TYPE_DEFAULTS: Record<GenerateType, {
  role: string
  tools: string[]
  maxSteps: number
}> = {
  'slide-generator': {
    role: 'Crée une présentation PowerPoint professionnelle et visuelle à partir du contenu de la note fournie.',
    tools: JSON.stringify(['note_search', 'note_read', 'generate_pptx']),
    maxSteps: 8,
  },
  'excalidraw-generator': {
    role: 'Génère un diagramme Excalidraw clair et professionnel à partir du contenu de la note fournie.',
    tools: JSON.stringify(['note_search', 'note_read', 'generate_excalidraw']),
    maxSteps: 6,
  },
}

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

  const body = await req.json()
  const { noteId, type, theme, style } = body as {
    noteId: string
    type: GenerateType
    theme?: string
    style?: string
  }

  if (!noteId || !type || !TYPE_DEFAULTS[type]) {
    return NextResponse.json({ error: 'Paramètres invalides' }, { status: 400 })
  }

  // Verify note belongs to user
  const note = await prisma.note.findFirst({
    where: { id: noteId, userId },
    select: { id: true, title: true, notebookId: true },
  })
  if (!note) {
    return NextResponse.json({ error: 'Note introuvable' }, { status: 404 })
  }

  const defaults = TYPE_DEFAULTS[type]
  const agentName = type === 'slide-generator'
    ? `Slides — ${(note.title || 'Note').substring(0, 40)}`
    : `Diagramme — ${(note.title || 'Note').substring(0, 40)}`

  // Create a dedicated one-shot agent for this note
  const agent = await prisma.agent.create({
    data: {
      name: agentName,
      type,
      role: defaults.role,
      tools: defaults.tools,
      maxSteps: defaults.maxSteps,
      frequency: 'manual',
      isEnabled: true,
      sourceNoteIds: JSON.stringify([noteId]),
      targetNotebookId: note.notebookId ?? undefined,
      slideTheme: theme ?? 'vibrant_tech',
      slideStyle: style ?? 'soft',
      userId,
    },
  })

  try {
    const { executeAgent } = await import('@/lib/ai/services/agent-executor.service')
    const result = await executeAgent(agent.id, userId)
    return NextResponse.json(result)
  } catch (err) {
    console.error('[run-for-note] executeAgent error:', err)
    return NextResponse.json(
      { success: false, error: err instanceof Error ? err.message : 'Erreur inconnue' },
      { status: 500 },
    )
  }
}