import { NextRequest, NextResponse } from "next/server";
import { getServerSession } from "next-auth";
import { authOptions } from "@/app/api/auth/authOptions";
import { prisma } from "@/lib/prisma";

export async function PUT(
  req: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const session = await getServerSession(authOptions);
    if (!session?.user || session.user.role !== "ADMIN") {
      return NextResponse.json({ error: "Accès refusé" }, { status: 403 });
    }

    const resolvedParams = await params;
    const clientId = parseInt(resolvedParams.id);
    
    if (isNaN(clientId)) {
      return NextResponse.json({ error: "ID client invalide" }, { status: 400 });
    }

    const { managerId } = await req.json();

    if (!managerId) {
      return NextResponse.json({ error: "ID manager manquant" }, { status: 400 });
    }

    // Vérifier que le client existe
    const client = await prisma.client.findUnique({
      where: { id: clientId }
    });

    if (!client) {
      return NextResponse.json({ error: "Client non trouvé" }, { status: 404 });
    }

    // Vérifier que le manager existe
    const manager = await prisma.user.findUnique({
      where: { id: parseInt(managerId), role: "MANAGER" }
    });

    if (!manager) {
      return NextResponse.json({ error: "Manager non trouvé" }, { status: 404 });
    }

    // Récupérer le ManagerData du manager cible
    const toManagerData = await prisma.managerData.findUnique({
      where: { userId: parseInt(managerId) }
    });

    if (!toManagerData) {
      return NextResponse.json({ error: "ManagerData non trouvé pour le manager" }, { status: 404 });
    }

    // Assigner le client au manager en synchronisant managerId et managerDataId
    const updatedClient = await prisma.client.update({
      where: { id: clientId },
      data: { 
        managerId: parseInt(managerId),
        managerDataId: toManagerData.id
      },
      include: { manager: true }
    });

    return NextResponse.json({
      success: true,
      message: "Client assigné avec succès",
      client: updatedClient
    });

  } catch (error) {
    console.error('Erreur lors de l\'assignation du client:', error);
    return NextResponse.json(
      { error: "Erreur lors de l'assignation" },
      { status: 500 }
    );
  }
}