pipeline {
  agent none

  options {
    timestamps()
  }

  environment {
    NODE_OPTIONS = '--max_old_space_size=2048'
    APP_VERSION = "1.0.${BUILD_NUMBER}"
    DOCKER_BUILDKIT = '1'
  }

  stages {

    stage('Init') {
      agent any
      when {
        branch 'main'
      }
      steps {
        script {
          env.COMMIT_AUTHOR = sh(
            script: "git show -s --format=%an HEAD",
            returnStdout: true
          ).trim()

          env.COMMIT_SHORT = sh(
            script: "git rev-parse --short HEAD",
            returnStdout: true
          ).trim()
        }

        echo "CD deploy for main (${env.COMMIT_SHORT})"
      }
    }

    /* =========================
       TESTS
       ========================= */

    stage('Backend: test (main)') {
      when {
        branch 'main'
      }
      agent {
        docker {
          image 'python:3.11-slim'
          args '-u root'
        }
      }
      steps {
        dir('backend') {
          sh '''
            set -e
            python -m venv .venv
            . .venv/bin/activate
            pip install --upgrade pip
            pip install -r requirements-dev.txt
            pytest
          '''
        }
      }
    }

    stage('Frontend: build (main)') {
      when {
        branch 'main'
      }
      agent {
        docker {
          image 'node:20-slim'
        }
      }
      steps {
        dir('frontend') {
          sh '''
            set -e
            npm install --no-progress --no-audit --prefer-offline
            npm run build
          '''
        }
      }
    }

    /* =========================
       DOCKER BUILD
       ========================= */

    stage('Docker: build images') {
      when {
        branch 'main'
      }
      agent any
      steps {
        sh '''
          set -e

          docker build \
            --build-arg APP_VERSION=${APP_VERSION} \
            --build-arg GIT_COMMIT=${COMMIT_SHORT} \
            --build-arg COMMIT_AUTHOR="${COMMIT_AUTHOR}" \
            --build-arg BUILD_NUMBER=${BUILD_NUMBER} \
            -t cafeteria-backend:${BUILD_NUMBER} \
            -t cafeteria-backend:latest \
            ./backend

          docker build \
            -t cafeteria-frontend:${BUILD_NUMBER} \
            -t cafeteria-frontend:latest \
            ./frontend
        '''
      }
    }

    /* =========================
       DEPLOY
       ========================= */

    stage('Deploy frontend & backend') {
      when {
        branch 'main'
      }
      agent any
      environment {
        JENKINS_BASE_URL = 'http://jenkins:8080'
        JENKINS_JOB_NAME = 'Espetos'
      }
      steps {
        withCredentials([
          usernamePassword(
            credentialsId: 'jenkins-api-token',
            usernameVariable: 'JENKINS_USER',
            passwordVariable: 'JENKINS_TOKEN'
          )
        ]) {
          sh '''
            set -e

            : "${BACKEND_PORT:?Missing BACKEND_PORT}"
            : "${BACKEND_HEALTH_URL:?Missing BACKEND_HEALTH_URL}"
            : "${FRONTEND_PORT:?Missing FRONTEND_PORT}"
            : "${FRONTEND_HEALTH_URL:?Missing FRONTEND_HEALTH_URL}"

            echo "Deploying backend ${BUILD_NUMBER}"

            docker tag cafeteria-backend:latest cafeteria-backend:previous || true
            docker rm -f cafeteria-backend 2>/dev/null || true

            docker run -d \
              --name cafeteria-backend \
              -p "$BACKEND_PORT":"$BACKEND_PORT" \
              cafeteria-backend:latest

            sleep 5

            if ! curl -fs "$BACKEND_HEALTH_URL"; then
              echo "Backend failed, rolling back"
              docker rm -f cafeteria-backend
              docker run -d \
                --name cafeteria-backend \
                -p "$BACKEND_PORT":"$BACKEND_PORT" \
                cafeteria-backend:previous
              exit 1
            fi

            echo "Deploying frontend ${BUILD_NUMBER}"

            docker tag cafeteria-frontend:latest cafeteria-frontend:previous || true
            docker rm -f cafeteria-frontend 2>/dev/null || true

            docker run -d \
              --name cafeteria-frontend \
              -p "$FRONTEND_PORT":80 \
              cafeteria-frontend:latest

            sleep 3

            if ! curl -fs "$FRONTEND_HEALTH_URL"; then
              echo "Frontend failed, rolling back"
              docker rm -f cafeteria-frontend
              docker run -d \
                --name cafeteria-frontend \
                -p "$FRONTEND_PORT":80 \
                cafeteria-frontend:previous
              exit 1
            fi
          '''
        }
      }
    }
  }

  post {
    always {
      cleanWs()
    }
  }
}