pipeline {
  agent {
    docker {
      image 'python:3.11-slim'
    }
  }

  environment {
    APP_PORT = '3001'
  }

  stages {

    stage('Install Dependencies') {
      steps {
        sh '''
          python --version
          pip install --upgrade pip
          pip install -r requirements.txt
        '''
      }
    }

    stage('Unit Tests') {
      steps {
        sh 'pytest test_app.py'
      }
    }

    stage('Run & Integration Test') {
      parallel {

        stage('Start App') {
          steps {
            sh '''
              gunicorn --bind 0.0.0.0:${APP_PORT} app:app &
              echo $! > gunicorn.pid
            '''
          }
        }

        stage('Integration Test') {
          steps {
            sh '''
              sleep 5
              curl -f http://localhost:${APP_PORT}
            '''
          }
        }
      }
      post {
        always {
          sh '''
            if [ -f gunicorn.pid ]; then
              kill $(cat gunicorn.pid) || true
            fi
          '''
        }
      }
    }

    stage('Containerization') {
      steps {
        echo 'Docker Build Image...'
        echo 'Docker Tag Image...'
        echo 'Docker Push Image...'
      }
    }
  }
}