# ─── BETE GitLab CI/CD Pipeline ───────────────────────────────────────────────
# Builds 4 Docker images (frontend, backend, discord-gateway, proxy),
# pushes to GitLab Container Registry, then deploys to VPS via SSH.
#
# Required CI/CD Variables (set in GitLab → Settings → CI/CD → Variables):
#
#   VPS_HOST        - VPS IP/hostname
#   VPS_USERNAME    - SSH user
#   VPS_SSH_KEY     - SSH private key (type: file)
#   ENV_FILE        - Full .env file content (type: env_var)
#
# Notes:
#   - VPS_SSH_KEY must be "File" type so GitLab writes it to disk
#   - ENV_FILE is "Variable" type — contains full multi-line .env content
#
# ──────────────────────────────────────────────────────────────────────────────

stages:
  - build
  - deploy

variables:
  # Use Docker-in-Docker for building with BuildKit
  DOCKER_HOST: tcp://docker:2376
  DOCKER_TLS_CERTDIR: "/certs"
  DOCKER_DRIVER: overlay2
  DOCKER_BUILDKIT: 1

  # Image naming
  REGISTRY: $CI_REGISTRY
  IMAGE_TAG_LATEST: latest
  IMAGE_TAG_COMMIT: $CI_COMMIT_SHA

  # Frontend build args
  VITE_BE_API_URL: https://imphnen.asepharyana.my.id
  VITE_BE_WS_URL: wss://imphnen.asepharyana.my.id

  # Deploy defaults
  SSH_HOST: "${VPS_USERNAME:-root}@${VPS_HOST:-45.127.35.244}"
  APP_DIR: /opt/imphenbot

# ── Build stage ───────────────────────────────────────────────────────────────
.docker-build:
  stage: build
  image: docker:27-cli
  tags:
    - docker
  services:
    - name: docker:27-dind
      command: ["--mtu=1400"]
  cache:
    key: docker-$CI_COMMIT_REF_SLUG-$SERVICE_NAME
    paths:
      - /caches/$SERVICE_NAME/
  before_script:
    # Login to GitLab Container Registry
    - echo "$CI_JOB_TOKEN" | docker login "$CI_REGISTRY" -u "$CI_REGISTRY_USER" --password-stdin
    # Ensure cache directory exists
    - mkdir -p /caches/$SERVICE_NAME
  script:
    # Build with cache
    - |
      docker build \
        --file infra/docker/Dockerfile.$SERVICE_NAME \
        --tag $REGISTRY/$CI_PROJECT_PATH/bete-$SERVICE_NAME:$IMAGE_TAG_COMMIT \
        --tag $REGISTRY/$CI_PROJECT_PATH/bete-$SERVICE_NAME:$IMAGE_TAG_LATEST \
        --build-arg BUILDKIT_INLINE_CACHE=1 \
        --build-arg VITE_BE_API_URL=$VITE_BE_API_URL \
        --build-arg VITE_BE_WS_URL=$VITE_BE_WS_URL \
        --cache-from $REGISTRY/$CI_PROJECT_PATH/bete-$SERVICE_NAME:latest \
        .
    # Push images
    - docker push $REGISTRY/$CI_PROJECT_PATH/bete-$SERVICE_NAME:$IMAGE_TAG_COMMIT
    - docker push $REGISTRY/$CI_PROJECT_PATH/bete-$SERVICE_NAME:$IMAGE_TAG_LATEST

build-frontend:
  extends: .docker-build
  variables:
    SERVICE_NAME: frontend
  only:
    - master

build-backend:
  extends: .docker-build
  variables:
    SERVICE_NAME: backend
  only:
    - master

build-discord-gateway:
  extends: .docker-build
  variables:
    SERVICE_NAME: discord-gateway
  only:
    - master

build-proxy:
  extends: .docker-build
  variables:
    SERVICE_NAME: proxy
  only:
    - master

# ── Deploy stage ──────────────────────────────────────────────────────────────
deploy-vps:
  stage: deploy
  image: alpine:latest
  tags:
    - docker
  only:
    - master
  needs:
    - build-frontend
    - build-backend
    - build-discord-gateway
    - build-proxy
  before_script:
    # Install SSH client and tools
    - apk add --no-cache openssh-client docker-compose bash
    # Set up SSH key (file-type variable: value is a path)
    - mkdir -p ~/.ssh
    - cp "$VPS_SSH_KEY" ~/.ssh/id_rsa
    - chmod 600 ~/.ssh/id_rsa
    # Write .env content to temp file for scp
    - printf '%s' "$ENV_FILE" > /tmp/.env.prod
    # Add VPS to known_hosts
    - ssh-keyscan -H "${VPS_HOST}" >> ~/.ssh/known_hosts 2>/dev/null
  script:
    # Copy .env and docker-compose to VPS
    - scp /tmp/.env.prod "$SSH_HOST:$APP_DIR/.env"
    - scp infra/docker/docker-compose.yml "$SSH_HOST:$APP_DIR/docker-compose.yml"
    # Deploy via SSH
    - |
      ssh "$SSH_HOST" "
        set -eu

        cd $APP_DIR

        # Login to GitLab Container Registry
        echo '$CI_JOB_TOKEN' | docker login $CI_REGISTRY -u '$CI_REGISTRY_USER' --password-stdin

        # Update image tags in docker-compose.yml to use GitLab registry
        sed -i 's|ghcr.io/\${OWNER:-mytheclipse}|$CI_REGISTRY/$CI_PROJECT_PATH|g' docker-compose.yml
        sed -i 's|\${OWNER:-mytheclipse}|$CI_PROJECT_NAMESPACE|g' docker-compose.yml

        # Pull latest images
        docker compose pull

        # Stop and remove old containers
        docker rm -f imphenbot-proxy imphenbot-backend imphenbot-frontend imphenbot-discord-gateway 2>/dev/null || true

        # Start fresh
        docker compose up -d --remove-orphans

        # Cleanup old images
        docker image prune -f
      "
  after_script:
    - rm -f ~/.ssh/id_rsa /tmp/.env.prod