name: Forms Backend

on:
  push:
    branches:
      - main
  pull_request:

jobs:
  lint:
    name: Linting
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Setup Python
        id: python
        uses: actions/setup-python@v2
        with:
          python-version: '3.9'

      - name: Setup Poetry
        uses: snok/install-poetry@v1.1.1
        with:
          virtualenvs-create: true
          virtualenvs-in-project: true

      # When same context exists in cache already, restore this environment.
      - name: Poetry Environment Caching
        uses: actions/cache@v2
        id: python_cache
        with:
          path: .venv
          key: "venv-${{ runner.os }}-${{ steps.python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}"

      # Only install dependencies when cache didn't hit.
      - name: Install dependencies
        if: steps.python_cache.outputs.cache-hit != 'true'
        run: |
          poetry install

      # Use this formatting to show them as GH Actions annotations.
      - name: Run flake8
        run: "poetry run flake8 --format='::error file=%(path)s,line=%(row)d,col=%(col)d::[flake8] %(code)s: %(text)s'"

      # Prepare the Pull Request Payload artifact. If this fails, we
      # we fail silently using the `continue-on-error` option. It's
      # nice if this succeeds, but if it fails for any reason, it
      # does not mean that our lint-test checks failed.
      - name: Prepare Pull Request Payload artifact
        id: prepare-artifact
        if: always() && github.event_name == 'pull_request'
        continue-on-error: true
        run: cat $GITHUB_EVENT_PATH | jq '.pull_request' > pull_request_payload.json

      # This only makes sense if the previous step succeeded. To
      # get the original outcome of the previous step before the
      # `continue-on-error` conclusion is applied, we use the
      # `.outcome` value. This step also fails silently.
      - name: Upload a Build Artifact
        if: always() && steps.prepare-artifact.outcome == 'success'
        continue-on-error: true
        uses: actions/upload-artifact@v2
        with:
          name: pull-request-payload
          path: pull_request_payload.json

  build:
    name: Build & Push
    runs-on: ubuntu-latest

    needs: [lint]
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'

    steps:
      - name: Create SHA Container Tag
        id: sha_tag
        run: |
          tag=$(cut -c 1-7 <<< $GITHUB_SHA)
          echo "::set-output name=tag::$tag"

      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Setup Docker BuildX
        uses: docker/setup-buildx-action@v1

      - name: Login to Github Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ secrets.GHCR_USER }}
          password: ${{ secrets.GHCR_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./Dockerfile
          push: true
          cache-from: type=registry,ref=ghcr.io/python-discord/forms-backend:latest
          cache-to: type=inline
          tags: |
            ghcr.io/python-discord/forms-backend:latest
            ghcr.io/python-discord/forms-backend:${{ steps.sha_tag.outputs.tag }}
          build-args: |
            git_sha=${{ github.sha }}

  deploy:
    name: Deployment
    runs-on: ubuntu-latest

    needs: [build]

    steps:
      - name: Create SHA Container Tag
        id: sha_tag
        run: |
          tag=$(cut -c 1-7 <<< $GITHUB_SHA)
          echo "::set-output name=tag::$tag"

      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Authenticate with Kubernetes
        uses: azure/k8s-set-context@v1
        with:
          method: kubeconfig
          kubeconfig: ${{ secrets.KUBECONFIG }}

      - name: Deploy to Kubernetes
        uses: Azure/k8s-deploy@v1
        with:
          manifests: |
            deployment.yaml
          images: 'ghcr.io/python-discord/forms-backend:${{ steps.sha_tag.outputs.tag }}'
          kubectl-version: 'latest'