import { getServerSession } from "next-auth/next";
import { authOptions } from "@/app/api/auth/[...nextauth]/route";
import { NextResponse } from "next/server";

async function getAdminToken() {
  try {
    const tokenResponse = await fetch(
      `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/token`,
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
        body: new URLSearchParams({
          grant_type: 'client_credentials',
          client_id: process.env.KEYCLOAK_CLIENT_ID!,
          client_secret: process.env.KEYCLOAK_CLIENT_SECRET!,
        }),
      }
    );

    const data = await tokenResponse.json();

    if (!tokenResponse.ok || !data.access_token) {
      console.error('Token Error:', data);
      return null;
    }

    return data.access_token;
  } catch (error) {
    console.error('Token Error:', error);
    return null;
  }
}

export async function GET() {
  const session = await getServerSession(authOptions);

  if (!session) {
    return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
  }

  try {
    const token = await getAdminToken();
    if (!token) {
      return NextResponse.json({ error: "Erreur d'authentification" }, { status: 401 });
    }

    const response = await fetch(
      `${process.env.KEYCLOAK_BASE_URL}/admin/realms/${process.env.KEYCLOAK_REALM}/roles`,
      {
        headers: {
          Authorization: `Bearer ${token}`,
        },
      }
    );

    if (!response.ok) {
      const errorData = await response.json();
      console.error("Failed to fetch roles:", errorData);
      return NextResponse.json({ error: "Erreur lors de la récupération des rôles" }, { status: response.status });
    }

    const roles = await response.json();

    // Filter out only Keycloak system roles
    const filteredRoles = roles.filter((role: any) => 
      !role.name.startsWith('default-roles-') && 
      !['offline_access', 'uma_authorization'].includes(role.name)
    );

    console.log("Available roles:", filteredRoles);
    return NextResponse.json(filteredRoles);
  } catch (error) {
    console.error("Error fetching roles:", error);
    return NextResponse.json(
      { error: "Une erreur est survenue" },
      { status: 500 }
    );
  }
}