# CD workflow — TEST LAB DEPLOYMENT
# Deploys to test lab host 192.168.88.40:2375.
# Production Hetzner target TBD — switch DOCKER_HOST when provisioned.
# See TODO.md Production Deployment section for cutover plan.

name: CD

on:
  workflow_run:
    workflows: ["CI"]
    types:
      - completed
    branches: [main]
  workflow_dispatch:

jobs:
  deploy:
    runs-on: [ubuntu-latest]
    if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
    environment: production
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

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

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: git.allucanget.biz
          username: ${{ secrets.CI_REGISTRY_USER }}
          password: ${{ secrets.CI_REGISTRY_TOKEN }}

      - name: Prepare environment
        run: |
          cat > .env << 'EOF'
          DATABASE_URL="${{ secrets.DATABASE_URL }}"
          REDIS_URL=redis://redis:6379/0
          PLAYLIST_PATH=/app/playlist/playlist.txt
          HLS_SEGMENT_DURATION=6
          HLS_WINDOW_SIZE=24
          LOG_LEVEL=info
          ADMIN_USERNAME="${{ secrets.ADMIN_USERNAME }}"
          ADMIN_PASSWORD="${{ secrets.ADMIN_PASSWORD }}"
          ADMIN_SESSION_TTL_HOURS=12
          NGINX_PORT=80
          EOF

      - name: Seed Prometheus config
        run: |
          mkdir -p monitoring/prometheus
          cat > monitoring/prometheus/prometheus.yml << 'EOF'
          global:
            scrape_interval: 15s
            evaluation_interval: 15s

          rule_files:
            - "/etc/prometheus/alerts.yml"

          scrape_configs:
            - job_name: 'chat'
              static_configs:
                - targets: ['chat:3000']
            - job_name: 'playout'
              static_configs:
                - targets: ['playout:8081']
            - job_name: 'nginx'
              static_configs:
                - targets: ['nginx-exporter:9113']
            - job_name: 'redis'
              static_configs:
                - targets: ['redis-exporter:9121']
            - job_name: 'postgres'
              static_configs:
                - targets: ['postgres-exporter:9187']
            - job_name: 'node'
              static_configs:
                - targets: ['node-exporter:9100']
            - job_name: 'prometheus'
              static_configs:
                - targets: ['localhost:9090']
          EOF
          cat > monitoring/prometheus/alerts.yml << 'EOF'
          groups:
            - name: linearvoid
              rules:
                - alert: ChatDown
                  expr: up{job="chat"} == 0
                  for: 2m
                  labels:
                    severity: critical
                  annotations:
                    summary: "Chat service is down"
                - alert: PlayoutDown
                  expr: up{job="playout"} == 0
                  for: 2m
                  labels:
                    severity: critical
                  annotations:
                    summary: "Playout service is down"
                - alert: RedisDown
                  expr: linearvoid_chat_redis_up == 0
                  for: 2m
                  labels:
                    severity: warning
                  annotations:
                    summary: "Redis is unreachable"
                - alert: PlayoutSlateActive
                  expr: linearvoid_playout_mode == 1
                  for: 1m
                  labels:
                    severity: warning
                  annotations:
                    summary: "Playout in slate fallback"
                - alert: HighCPU
                  expr: 100 - (avg by (instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
                  for: 10m
                  labels:
                    severity: warning
                  annotations:
                    summary: "High CPU usage"
                - alert: LowDiskSpace
                  expr: (node_filesystem_avail_bytes{mountpoint="/"} / node_filesystem_size_bytes{mountpoint="/"}) * 100 < 10
                  for: 5m
                  labels:
                    severity: warning
                  annotations:
                    summary: "Low disk space"
          EOF

      - name: Deploy with docker-compose
        env:
          DOCKER_HOST: tcp://192.168.88.40:2375
        run: |
          docker compose -f docker-compose.prod.yml pull
          docker compose -f docker-compose.prod.yml up -d --remove-orphans

      - name: Health check
        env:
          DOCKER_HOST: tcp://192.168.88.40:2375
        run: |
          # Wait for services to stabilize
          sleep 20

          # Check chat health (via docker exec — IP-agnostic, works on any DOCKER_HOST)
          echo "Checking chat health..."
          if ! docker exec linearvoid-chat curl -sf http://localhost:3000/health; then
            echo "Chat health check failed"
            docker logs linearvoid-chat --tail 50
            exit 1
          fi

          # Check nginx health
          echo "Checking nginx health..."
          if ! docker exec linearvoid-nginx curl -sf http://localhost/health; then
            echo "Nginx health check failed"
            docker logs linearvoid-nginx --tail 50
            exit 1
          fi

          # Retry playout health check since it may still be initializing
          echo "Checking playout health..."
          for i in $(seq 1 6); do
            if docker exec linearvoid-playout curl -sf http://localhost:8081/health; then
              echo "Playout is healthy"
              break
            fi
            echo "Playout not ready yet (attempt $i/6), waiting 5s..."
            sleep 5
          done
          if ! docker exec linearvoid-playout curl -sf http://localhost:8081/health; then
            echo "Playout failed to become healthy after 6 attempts"
            docker logs linearvoid-playout --tail 50
            exit 1
          fi

          echo "All services healthy"

      - name: Cleanup old images
        env:
          DOCKER_HOST: tcp://192.168.88.40:2375
        run: |
          docker image prune -f --filter "until=24h"