pipeline {
  agent none

  options {
    timestamps()
  }

  parameters {
    string(
      name: 'JENKINS_BASE_URL',
      defaultValue: 'https://openbokeron.org/jenkins',
      description: 'Base URL del Jenkins objetivo'
    )
    string(
      name: 'JENKINS_JOB_NAME',
      defaultValue: 'TallerCiCd',
      description: 'Nombre del job que se consulta en Jenkins'
    )
    string(
      name: 'VITE_API_BASE',
      defaultValue: '/taller/api',
      description: 'Base path/API para el frontend (build time)'
    )
  }

  environment {
    NODE_OPTIONS = '--max_old_space_size=2048'
    APP_VERSION = "1.0.${BUILD_NUMBER}"
    DOCKER_BUILDKIT = '1'
    JENKINS_BASE_URL = "${params.JENKINS_BASE_URL}"
    JENKINS_JOB_NAME = "${params.JENKINS_JOB_NAME}"
    VITE_API_BASE = "${params.VITE_API_BASE}"
    PYTHONDONTWRITEBYTECODE = 1
  }

  stages {

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

    stage('Backend: test (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
          '''
        }
      }
    }


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

    stage('Docker: build images') {
      agent any

      steps {
        script {
            env.COMMIT_SHORT = sh(
                script: "git rev-parse --short HEAD",
                returnStdout: true
            ).trim()
            env.COMMIT_AUTHOR = sh(
              script: "git show -s --format=%an HEAD",
              returnStdout: true
            ).trim()
        }

        sh '''
          set -e

          OLD_BACKEND_LATEST_ID=$(docker images -q cafeteria-backend:latest || true)
          OLD_BACKEND_PREVIOUS_ID=$(docker images -q cafeteria-backend:previous || true)
          OLD_FRONTEND_LATEST_ID=$(docker images -q cafeteria-frontend:latest || true)
          OLD_FRONTEND_PREVIOUS_ID=$(docker images -q cafeteria-frontend:previous || true)

          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:latest \
            ./backend

          docker build \
            --build-arg VITE_API_BASE=${VITE_API_BASE} \
            -t cafeteria-frontend:latest \
            ./frontend

          NEW_BACKEND_LATEST_ID=$(docker images -q cafeteria-backend:latest || true)
          NEW_FRONTEND_LATEST_ID=$(docker images -q cafeteria-frontend:latest || true)

          if [ -n "$OLD_BACKEND_LATEST_ID" ]; then
            docker tag "$OLD_BACKEND_LATEST_ID" cafeteria-backend:previous
          fi
          if [ -n "$OLD_FRONTEND_LATEST_ID" ]; then
            docker tag "$OLD_FRONTEND_LATEST_ID" cafeteria-frontend:previous
          fi

          if [ -n "$OLD_BACKEND_PREVIOUS_ID" ] && \
             [ "$OLD_BACKEND_PREVIOUS_ID" != "$OLD_BACKEND_LATEST_ID" ] && \
             [ "$OLD_BACKEND_PREVIOUS_ID" != "$NEW_BACKEND_LATEST_ID" ]; then
            docker rmi "$OLD_BACKEND_PREVIOUS_ID" || true
          fi

          if [ -n "$OLD_FRONTEND_PREVIOUS_ID" ] && \
             [ "$OLD_FRONTEND_PREVIOUS_ID" != "$OLD_FRONTEND_LATEST_ID" ] && \
             [ "$OLD_FRONTEND_PREVIOUS_ID" != "$NEW_FRONTEND_LATEST_ID" ]; then
            docker rmi "$OLD_FRONTEND_PREVIOUS_ID" || true
          fi

          cleanup_tags() {
            repo="$1"
            docker images --format "{{.Repository}}:{{.Tag}}" \
              | awk -v repo="$repo" '$0 ~ "^"repo":" && $0 !~ /:latest$|:previous$/' \
              | xargs -r docker rmi || true
          }

          cleanup_tags cafeteria-backend
          cleanup_tags cafeteria-frontend
        '''
      }
    }

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

    stage('Deploy (docker compose)') {
      agent any
      steps {
        withCredentials([
          usernamePassword(
            credentialsId: 'jenkins-api-token',
            usernameVariable: 'JENKINS_USER',
            passwordVariable: 'JENKINS_TOKEN'
          )
        ]) {
          sh '''
            set -e

            echo "Deploying backend ${BUILD_NUMBER}"

            BACKEND_TAG=latest FRONTEND_TAG=latest docker compose up -d
          '''
        }
      }
    }



    stage('Cleanup') {
        agent any
        steps {
            cleanWs()
        }
    }
  }

}