name: Deploy

# Деплоится только при изменениях основного стека.
# Obsidian-стек (CouchDB) — отдельный workflow `deploy-obsidian.yml`.
on:
  push:
    branches: [main]
    paths:
      - "backend/**"
      - "frontend/**"
      - "docker-compose.prod.yml"
      - "Caddyfile"
      - ".github/workflows/deploy.yml"
      # NB: shared compose-fragments (network) — тоже триггерят main
      # потому что Caddy шарит сеть с obsidian-stack
  workflow_dispatch:

concurrency:
  group: deploy-prod
  cancel-in-progress: false

env:
  IMAGE_BACKEND: ghcr.io/lekss361/gendesign-backend
  IMAGE_WORKER: ghcr.io/lekss361/gendesign-worker
  IMAGE_FRONTEND: ghcr.io/lekss361/gendesign-frontend

jobs:
  changes:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read
    outputs:
      backend: ${{ steps.filter.outputs.backend }}
      frontend: ${{ steps.filter.outputs.frontend }}
      infra: ${{ steps.filter.outputs.infra }}
    steps:
      - uses: actions/checkout@v4
      - uses: dorny/paths-filter@v3
        id: filter
        with:
          filters: |
            backend:
              - 'backend/**'
            frontend:
              - 'frontend/**'
            infra:
              - 'docker-compose.prod.yml'
              - 'Caddyfile'
              - '.github/workflows/deploy.yml'

  build-backend:
    runs-on: ubuntu-latest
    needs: changes
    permissions:
      contents: read
      packages: write
    if: |
      needs.changes.outputs.backend == 'true' ||
      needs.changes.outputs.infra == 'true' ||
      github.event_name == 'workflow_dispatch'
    steps:
      - uses: actions/checkout@v4

      - name: Login to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build & push backend (lean — без Chromium)
        uses: docker/build-push-action@v6
        with:
          context: ./backend
          target: runner
          push: true
          cache-from: type=gha,scope=backend-lean
          cache-to: type=gha,mode=max,scope=backend-lean
          tags: |
            ${{ env.IMAGE_BACKEND }}:latest
            ${{ env.IMAGE_BACKEND }}:${{ github.sha }}

  build-worker:
    runs-on: ubuntu-latest
    needs: changes
    permissions:
      contents: read
      packages: write
    if: |
      needs.changes.outputs.backend == 'true' ||
      needs.changes.outputs.infra == 'true' ||
      github.event_name == 'workflow_dispatch'
    steps:
      - uses: actions/checkout@v4

      - name: Login to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build & push worker (с Chromium для Playwright)
        uses: docker/build-push-action@v6
        with:
          context: ./backend
          target: runner-with-chromium
          push: true
          cache-from: type=gha,scope=worker-chromium
          cache-to: type=gha,mode=max,scope=worker-chromium
          tags: |
            ${{ env.IMAGE_WORKER }}:latest
            ${{ env.IMAGE_WORKER }}:${{ github.sha }}

  build-frontend:
    runs-on: ubuntu-latest
    needs: changes
    permissions:
      contents: read
      packages: write
    if: |
      needs.changes.outputs.frontend == 'true' ||
      needs.changes.outputs.infra == 'true' ||
      github.event_name == 'workflow_dispatch'
    steps:
      - uses: actions/checkout@v4

      - name: Login to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build & push frontend
        uses: docker/build-push-action@v6
        with:
          context: ./frontend
          push: true
          cache-from: type=gha,scope=frontend
          cache-to: type=gha,mode=max,scope=frontend
          tags: |
            ${{ env.IMAGE_FRONTEND }}:latest
            ${{ env.IMAGE_FRONTEND }}:${{ github.sha }}

  deploy:
    runs-on: ubuntu-latest
    needs: [changes, build-backend, build-worker, build-frontend]
    permissions:
      contents: read
    # Запускается если ни один build не завершился failure.
    # `always()` позволяет выполнить job даже когда зависимые jobs были skipped.
    if: |
      always() &&
      !cancelled() &&
      needs.build-backend.result != 'failure' &&
      needs.build-worker.result != 'failure' &&
      needs.build-frontend.result != 'failure'
    steps:
      - name: Deploy to VM via SSH
        uses: appleboy/ssh-action@v1.0.3
        env:
          IMAGE_TAG: latest
          SENTRY_RELEASE_VAL: ${{ github.sha }}
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          port: ${{ secrets.DEPLOY_PORT || 22 }}
          envs: IMAGE_TAG,SENTRY_RELEASE_VAL
          script: |
            set -euo pipefail
            cd /opt/gendesign

            # Sync compose / Caddyfile / init scripts from the repo.
            # --ff-only refuses if there are local commits on the VM (we don't expect any).
            git fetch origin main
            git reset --hard origin/main

            # Sentry release tracking — записываем git-sha в .env.runtime.
            # ВАЖНО: НЕ перезаписываем файл целиком (там могут быть
            # COUCHDB_PASSWORD и др. user-managed secrets). Заменяем только
            # строку SENTRY_RELEASE или добавляем если её нет.
            # IMAGE_TAG=latest для docker pull; SENTRY_RELEASE_VAL = git sha для трекинга.
            mkdir -p backend
            touch backend/.env.runtime
            if grep -q '^SENTRY_RELEASE=' backend/.env.runtime; then
                sed -i "s|^SENTRY_RELEASE=.*|SENTRY_RELEASE=$SENTRY_RELEASE_VAL|" backend/.env.runtime
            else
                printf 'SENTRY_RELEASE=%s\n' "$SENTRY_RELEASE_VAL" >> backend/.env.runtime
            fi
            chmod 600 backend/.env.runtime

            # Создать external network если её нет (нужна Caddy для маршрута
            # obsidian.gendsgn.ru → couchdb из отдельного obsidian-stack).
            docker network inspect gendesign_shared >/dev/null 2>&1 \
                || docker network create gendesign_shared

            export IMAGE_TAG="$IMAGE_TAG"
            # Project name явно — `gendesign` (по имени папки auto), но
            # фиксируем для consistency с obsidian-stack (-p gendesign-obsidian).
            docker compose -p gendesign -f docker-compose.prod.yml pull
            docker compose -p gendesign -f docker-compose.prod.yml up -d

            # Caddyfile is bind-mounted; up -d won't re-read it. Reload explicitly.
            # `|| true` so a temporary Caddy hiccup doesn't fail the whole deploy.
            docker compose -p gendesign -f docker-compose.prod.yml exec -T caddy \
              caddy reload --config /etc/caddy/Caddyfile || true

            # Clean up disk — aggressive чтобы избежать накопления.
            # 1. Для каждого gendesign-* repo оставляем 2 самых свежих SHA-тега
            #    + :latest. Docker images сортирует по Created DESC.
            for repo in ghcr.io/lekss361/gendesign-backend \
                        ghcr.io/lekss361/gendesign-worker \
                        ghcr.io/lekss361/gendesign-frontend; do
              docker images "$repo" --format '{{.Repository}}:{{.Tag}}' \
                | grep -v ':latest$' \
                | tail -n +3 \
                | xargs -r docker rmi 2>/dev/null || true
            done
            # 2. ВСЕ unused images (даже свежие). Running контейнеры безопасны
            #    — их images не unused. Раньше был filter until=72h, но при
            #    частых деплоях оставались "fresh dangling" layers, накапливая
            #    до 50GB за неделю.
            docker image prune -af || true
            docker builder prune -af || true

            # Wait for backend to be healthy (up to 30 s).
            for i in $(seq 1 30); do
              curl -fsS http://localhost:8000/health && break
              sleep 1
            done