# ──────────────────────────────────────────────────────────────────────────────
# Flight Radar — GitLab CI/CD
#
# PREREQUISITES (one-time setup on the server):
#
#   1. Install GitLab Runner
#      https://docs.gitlab.com/runner/install/linux-manually/
#
#   2. Register the runner (shell executor, tag: "shell")
#      gitlab-runner register \
#        --url https://gitlab.com \
#        --registration-token <YOUR_PROJECT_TOKEN> \
#        --executor shell \
#        --tag-list shell \
#        --description "flight-radar-server"
#
#   3. Give the runner access to Docker (no sudo needed)
#      sudo usermod -aG docker gitlab-runner
#      sudo systemctl restart gitlab-runner
#
# PIPELINE BEHAVIOUR:
#   • Triggers on every push to the default branch (main).
#   • Builds both Docker images on the server (no registry needed).
#   • Brings the app up with docker compose; only changed services restart.
#   • If the build fails the old containers keep running — no downtime.
#   • Prunes dangling images after a successful deploy.
# ──────────────────────────────────────────────────────────────────────────────

stages:
  - deploy

variables:
  # Stable project name so containers are found across different checkout dirs
  COMPOSE_PROJECT: flight-radar
  # Path to compose file (relative to repo root = $CI_PROJECT_DIR)
  COMPOSE_FILE: flight-comparator/docker-compose.yml

deploy:
  stage: deploy
  tags:
    - shell          # must match the tag you gave your runner at registration
  rules:
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
  script:
    - echo "=== Deploying commit $CI_COMMIT_SHORT_SHA to $CI_COMMIT_BRANCH ==="
    - docker compose -f "$COMPOSE_FILE" -p "$COMPOSE_PROJECT" up --build -d --remove-orphans
    - echo "=== Cleaning up dangling images ==="
    - docker image prune -f
    - echo "=== Running containers ==="
    - docker compose -f "$COMPOSE_FILE" -p "$COMPOSE_PROJECT" ps