name: Release

on:
  push:
    tags:
      - 'v*'

jobs:
  release:
    runs-on: dind
    steps:
      - name: Install tooling
        run: apk add --no-cache git curl jq docker-cli docker-cli-buildx

      - name: Clone repository at tag
        run: |
          git clone "https://${{ secrets.GITEA_TOKEN }}@gitea.jeanlucmakiola.de/${{ gitea.repository }}.git" repo
          cd repo
          git checkout "${{ gitea.ref_name }}"

      - name: Compute previous tag and changelog
        working-directory: repo
        run: |
          VERSION="${{ gitea.ref_name }}"
          PREV_TAG=$(git tag -l 'v*' --sort=-v:refname | grep -v "^${VERSION}$" | head -n1 || true)
          if [ -z "$PREV_TAG" ]; then
            CHANGELOG=$(git log --pretty=format:"- %s" "${VERSION}")
          else
            CHANGELOG=$(git log --pretty=format:"- %s" "${PREV_TAG}..${VERSION}")
          fi
          {
            echo "VERSION=$VERSION"
            echo "PREV_TAG=$PREV_TAG"
            echo "CHANGELOG<<CHANGELOG_EOF"
            echo "$CHANGELOG"
            echo "CHANGELOG_EOF"
          } >> "$GITHUB_ENV"

      - name: Log in to Gitea registry
        run: |
          echo "${{ secrets.REGISTRY_TOKEN }}" \
            | docker login gitea.jeanlucmakiola.de -u "${{ gitea.repository_owner }}" --password-stdin

      - name: Build and push Docker image
        working-directory: repo
        run: |
          IMAGE="gitea.jeanlucmakiola.de/${{ gitea.repository }}"
          docker buildx create --use --name builder >/dev/null 2>&1 || docker buildx use builder
          docker buildx build \
            --cache-from "type=registry,ref=${IMAGE}:buildcache" \
            --cache-to   "type=registry,ref=${IMAGE}:buildcache,mode=max" \
            -f docker/Dockerfile \
            -t "${IMAGE}:${VERSION}" \
            -t "${IMAGE}:latest" \
            --push .

      - name: Create Gitea release
        run: |
          API_URL="${GITHUB_SERVER_URL}/api/v1/repos/${{ gitea.repository }}/releases"
          curl -fsS -X POST "$API_URL" \
            -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
            -H "Content-Type: application/json" \
            -d "$(jq -n \
              --arg tag "$VERSION" \
              --arg name "$VERSION" \
              --arg body "$CHANGELOG" \
              '{tag_name: $tag, name: $name, body: $body, draft: false, prerelease: false}')"