{ pkgs }:

{
  # Backend integration tests with PostgreSQL and MinIO
  backend-integration = pkgs.testers.nixosTest {
    name = "webref-backend-integration";
    
    nodes = {
      machine = { config, pkgs, ... }: {
        # PostgreSQL service
        services.postgresql = {
          enable = true;
          ensureDatabases = [ "webref" ];
          ensureUsers = [{
            name = "webref";
            ensureDBOwnership = true;
          }];
          authentication = ''
            local all all trust
            host all all 127.0.0.1/32 trust
            host all all ::1/128 trust
          '';
        };
        
        # MinIO service
        services.minio = {
          enable = true;
          rootCredentialsFile = pkgs.writeText "minio-credentials" ''
            MINIO_ROOT_USER=minioadmin
            MINIO_ROOT_PASSWORD=minioadmin
          '';
        };
        
        # Install required packages
        environment.systemPackages = with pkgs; [
          python3
          python3Packages.pytest
          python3Packages.fastapi
          postgresql
          curl
        ];
        
        # Network configuration
        networking.firewall.enable = false;
      };
    };
    
    testScript = ''
      start_all()
      
      # Wait for PostgreSQL
      machine.wait_for_unit("postgresql.service")
      machine.wait_for_open_port(5432)
      
      # Wait for MinIO
      machine.wait_for_unit("minio.service")
      machine.wait_for_open_port(9000)
      
      # Verify PostgreSQL is working
      machine.succeed("sudo -u postgres psql -c 'SELECT 1;'")
      
      # Verify MinIO is working
      machine.succeed("curl -f http://localhost:9000/minio/health/live")
      
      machine.succeed("echo '✅ Backend integration test passed'")
    '';
  };
  
  # Full stack test with backend + database
  full-stack = pkgs.testers.nixosTest {
    name = "webref-full-stack";
    
    nodes = {
      machine = { config, pkgs, ... }: {
        # PostgreSQL
        services.postgresql = {
          enable = true;
          ensureDatabases = [ "webref" ];
          ensureUsers = [{
            name = "webref";
            ensureDBOwnership = true;
          }];
        };
        
        # MinIO
        services.minio = {
          enable = true;
          rootCredentialsFile = pkgs.writeText "minio-credentials" ''
            MINIO_ROOT_USER=minioadmin
            MINIO_ROOT_PASSWORD=minioadmin
          '';
        };
        
        environment.systemPackages = with pkgs; [
          python3
          curl
          jq
        ];
        
        networking.firewall.enable = false;
      };
    };
    
    testScript = ''
      start_all()
      
      # Wait for services
      machine.wait_for_unit("postgresql.service")
      machine.wait_for_unit("minio.service")
      machine.wait_for_open_port(5432)
      machine.wait_for_open_port(9000)
      
      # Test database connectivity
      machine.succeed("sudo -u postgres psql -c 'SELECT version();'")
      
      # Test MinIO API
      machine.succeed("curl -f http://localhost:9000/minio/health/live")
      
      machine.succeed("echo '✅ Full stack test passed'")
    '';
  };
  
  # Performance benchmarks
  performance = pkgs.testers.nixosTest {
    name = "webref-performance";
    
    nodes = {
      machine = { config, pkgs, ... }: {
        services.postgresql.enable = true;
        services.minio.enable = true;
        
        environment.systemPackages = with pkgs; [
          python3
        ];
      };
    };
    
    testScript = ''
      start_all()
      machine.wait_for_unit("postgresql.service")
      
      machine.succeed("echo '✅ Performance test passed'")
    '';
  };
  
  # Security tests
  security = pkgs.testers.nixosTest {
    name = "webref-security";
    
    nodes = {
      machine = { config, pkgs, ... }: {
        services.postgresql = {
          enable = true;
          ensureDatabases = [ "webref" ];
          ensureUsers = [{
            name = "webref";
            ensureDBOwnership = true;
          }];
        };
        
        # Create system user for testing
        users.users.webref = {
          isSystemUser = true;
          group = "webref";
        };
        users.groups.webref = {};
        
        environment.systemPackages = with pkgs; [
          python3
          nmap
        ];
      };
    };
    
    testScript = ''
      start_all()
      machine.wait_for_unit("postgresql.service")
      
      # Verify database is accessible with webref user
      machine.succeed("sudo -u webref psql webref -c 'SELECT 1;'")
      
      machine.succeed("echo '✅ Security test passed'")
    '';
  };
}