import { getServerSession } from "next-auth/next";
import { authOptions } from "@/app/api/auth/options";
import { NextResponse } from "next/server";
import { logger } from '@/lib/logger';
import { fetchWithTimeout, fetchJsonWithTimeout } from '@/lib/utils/fetch-with-timeout';

// Helper function to get Leantime user ID by email
async function getLeantimeUserId(email: string): Promise<number | null> {
  try {
    // Validate email format
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailRegex.test(email)) {
      logger.error('[LEANTIME] Invalid email format', { email: email.substring(0, 5) + '***' });
      return null;
    }

    // Get user by email using the proper method
    const userData = await fetchJsonWithTimeout('https://agilite.slm-lab.net/api/jsonrpc', {
      method: 'POST',
      timeout: 10000, // 10 seconds
      headers: {
        'Content-Type': 'application/json',
        'X-API-Key': process.env.LEANTIME_TOKEN || '',
      },
      body: JSON.stringify({
        method: 'leantime.rpc.Users.Users.getUserByEmail',
        jsonrpc: '2.0',
        id: 1,
        params: {
          email: email
        }
      })
    });

    // Only log minimal information for debugging
    logger.debug('[LEANTIME] User lookup completed', { hasResult: !!userData.result });

    if (!userData.result) {
      logger.warn('[LEANTIME] User not found', { email: email.substring(0, 5) + '***' });
      return null;
    }

    // The result should be the user object or false
    if (userData.result === false) {
      return null;
    }

    return userData.result.id;
  } catch (error) {
    logger.error('[LEANTIME] Error getting user', {
      error: error instanceof Error ? error.message : String(error)
    });
    return null;
  }
}

// Helper function to delete user from Leantime
async function deleteLeantimeUser(email: string, requestingUserId: string): Promise<{ success: boolean; error?: string }> {
  try {
    // First get the Leantime user ID
    const leantimeUserId = await getLeantimeUserId(email);
    if (!leantimeUserId) {
      return { 
        success: false, 
        error: 'User not found in Leantime' 
      };
    }

    // Check if the requesting user has permission to delete this user
    // This is a placeholder - implement proper permission check based on your requirements
    if (!(await hasDeletePermission(requestingUserId, leantimeUserId))) {
      return {
        success: false,
        error: 'Unauthorized to delete this user'
      };
    }

    const data = await fetchJsonWithTimeout('https://agilite.slm-lab.net/api/jsonrpc', {
      method: 'POST',
      timeout: 10000, // 10 seconds
      headers: {
        'Content-Type': 'application/json',
        'X-API-Key': process.env.LEANTIME_TOKEN || '',
      },
      body: JSON.stringify({
        method: 'leantime.rpc.Users.Users.deleteUser',
        jsonrpc: '2.0',
        id: 1,
        params: {
          id: leantimeUserId
        }
      })
    });
    
    // Only log minimal information
    logger.debug('[LEANTIME] Delete user completed', { success: !!data.result });

    if (!data.result) {
      return { 
        success: false, 
        error: 'Failed to delete user in Leantime' 
      };
    }

    return { success: true };
  } catch (error) {
    logger.error('[LEANTIME] Error deleting user', {
      error: error instanceof Error ? error.message : String(error)
    });
    return { 
      success: false, 
      error: 'Error deleting user in Leantime' 
    };
  }
}

// Placeholder for permission check - implement based on your requirements
async function hasDeletePermission(requestingUserId: string, targetUserId: number): Promise<boolean> {
  // Implement proper permission check logic here
  // For example:
  // 1. Check if requesting user is admin
  // 2. Check if requesting user is trying to delete themselves
  // 3. Check if requesting user has the right role/permissions
  return true;
}

export async function DELETE(req: Request, props: { params: Promise<{ userId: string }> }) {
  const params = await props.params;
  const session = await getServerSession(authOptions);
  const userId = params.userId; // Store userId from params to avoid sync access issues

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

  try {
    // Get admin token
    const tokenData = await fetchJsonWithTimeout(
      `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/token`,
      {
        method: 'POST',
        timeout: 10000, // 10 seconds
        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!,
        }),
      }
    );

    if (!tokenData.access_token) {
      logger.error('[KEYCLOAK] Failed to get admin token');
      return NextResponse.json({ error: "Erreur d'authentification" }, { status: 401 });
    }

    // Get user details before deletion
    const userDetails = await fetchJsonWithTimeout(
      `${process.env.KEYCLOAK_BASE_URL}/admin/realms/${process.env.KEYCLOAK_REALM}/users/${userId}`,
      {
        timeout: 10000, // 10 seconds
        headers: {
          Authorization: `Bearer ${tokenData.access_token}`,
        },
      }
    );

    logger.debug('[USER_DELETE] Processing user deletion', { userId });
    
    // Forward the request to the new endpoint format with the email parameter
    // This ensures Dolibarr deletion is also handled
    const apiUrl = new URL(`${req.headers.get('origin') || process.env.NEXTAUTH_URL}/api/users`);
    apiUrl.searchParams.append('id', userId);
    apiUrl.searchParams.append('email', userDetails.email);
    
    const forwardResponse = await fetchWithTimeout(apiUrl.toString(), {
      method: "DELETE",
      timeout: 30000, // 30 seconds
      headers: {
        "Cookie": req.headers.get('cookie') || '',
        "Authorization": req.headers.get('authorization') || '',
      },
    });
    
    if (!forwardResponse.ok) {
      const errorData = await forwardResponse.json();
      logger.error('[USER_DELETE] Error forwarding delete request', { errorData });
      return NextResponse.json(
        { error: "Erreur lors de la suppression de l'utilisateur", details: errorData },
        { status: forwardResponse.status }
      );
    }
    
    const responseData = await forwardResponse.json();
    return NextResponse.json(responseData);

  } catch (error) {
    logger.error('[USER_DELETE] Error deleting user', {
      error: error instanceof Error ? error.message : String(error),
      userId
    });
    return NextResponse.json(
      { error: "Erreur serveur" },
      { status: 500 }
    );
  }
}

export async function PUT(req: Request, props: { params: Promise<{ userId: string }> }) {
  const params = await props.params;
  const session = await getServerSession(authOptions);

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

  try {
    const body = await req.json();

    // Get client credentials token
    const tokenData = await fetchJsonWithTimeout(
      `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/token`,
      {
        method: 'POST',
        timeout: 10000, // 10 seconds
        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!,
        }),
      }
    );

    if (!tokenData.access_token) {
      logger.error('[KEYCLOAK] Failed to get token', { tokenData });
      return NextResponse.json({ error: "Failed to get token" }, { status: 500 });
    }

    // Update user
    const updateResponse = await fetchWithTimeout(
      `${process.env.KEYCLOAK_BASE_URL}/admin/realms/${process.env.KEYCLOAK_REALM}/users/${params.userId}`,
      {
        method: 'PUT',
        timeout: 10000, // 10 seconds
        headers: {
          'Authorization': `Bearer ${tokenData.access_token}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(body),
      }
    );

    if (!updateResponse.ok) {
      const errorData = await updateResponse.json();
      logger.error('[KEYCLOAK] Failed to update user', { errorData, userId: params.userId });
      return NextResponse.json({ error: "Failed to update user" }, { status: updateResponse.status });
    }

    return NextResponse.json({ success: true });
  } catch (error) {
    logger.error('[USER_UPDATE] Error updating user', {
      error: error instanceof Error ? error.message : String(error),
      userId: params.userId
    });
    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
  }
}