name: Build, Push, and Deploy with Blue/Green or Canary

on:
  push:
    branches:
      - main

jobs:
  build-push:
    runs-on: self-hosted
    steps:
      - name: Check out code
        uses: actions/checkout@v3

      - name: Log in to Container Registry
        run: echo ${{ secrets.password }} | docker login registry.i80.dk -u ${{ secrets.username }} --password-stdin

      - name: Build Docker Image
        run: |
          COMMIT_HASH=$(git rev-parse --short HEAD)
          docker build -t registry.i80.dk/gitea/lifefaq:green -t registry.i80.dk/gitea/lifefaq:${COMMIT_HASH} .

      - name: Push Docker Image
        run: |
          COMMIT_HASH=$(git rev-parse --short HEAD)
          docker push registry.i80.dk/gitea/lifefaq:${COMMIT_HASH}
          docker push registry.i80.dk/gitea/lifefaq:green

  blue-green-deploy:
    runs-on: self-hosted
    needs: build-push
    steps:
      - name: Deploy Green Version
        env:
          NOMAD_ADDR: https://nomad.i80.dk
        run: nomad job run -var="image=registry.i80.dk/gitea/lifefaq:green" .gitea/workflows/nomad-job-green.hcl

      - name: Switch Traffic to Green
        run: ssh runner@nomad sudo /opt/nginx_updater/venv/bin/python3 /opt/nginx_updater/nginx_updater.py lifefaq --target green

      - name: Validate Deployment
        run: curl -f https://lifefaq.i80.dk/health || exit 1

      - name: Purge Old Blue Version
        if: success()
        env:
          NOMAD_ADDR: https://nomad.i80.dk
        run: nomad job stop -purge lifefaq-blue

  canary-deploy:
    runs-on: self-hosted
    needs: build-push
    steps:
      - name: Deploy Canary Version
        env:
          NOMAD_ADDR: https://nomad.i80.dk
        run: nomad job run -var="image=registry.i80.dk/gitea/lifefaq:${COMMIT_HASH}" .gitea/workflows/nomad-job-canary.hcl

      - name: Update Forwarder for Canary (10% traffic)
        run: ssh runner@nomad sudo /opt/nginx_updater/venv/bin/python3 /opt/nginx_updater/update_forwarder.py --subdomain lifefaq --weight 10

      - name: Monitor and Scale Canary
        run: |
          # Monitor performance for 10 minutes
          sleep 600
          curl -f https://lifefaq.i80.dk/health || exit 1
          ssh runner@nomad sudo /opt/nginx_updater/venv/bin/python3 /opt/nginx_updater/update_forwarder.py --subdomain lifefaq --weight 50

      - name: Complete Canary Rollout
        if: success()
        run: ssh runner@nomad sudo /opt/nginx_updater/venv/bin/python3 /opt/nginx_updater/update_forwarder.py --subdomain lifefaq --weight 100