name: Build and Push Docker Image

on:
  push:
    branches: [ main, master ]
    tags: [ 'v*', 'release-*' ]
  workflow_dispatch: {}

env:
  DOCKERFILE: Dockerfile

jobs:
  docker:
    runs-on: docker
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Define Registry Variables
        id: vars
        run: |
          # Derive registry/namespace/image from Gitea context, normalize to lowercase
          OWNER="${{ gitea.repository_owner }}"
          REPO="${{ gitea.repository_name }}"
          OWNER=$(echo "$OWNER" | tr '[:upper:]' '[:lower:]')
          REPO=$(echo "$REPO" | tr '[:upper:]' '[:lower:]')

          # Allow overriding image name via repository variable IMAGE_NAME; default to repo name
          IMAGE_NAME="${{ vars.IMAGE_NAME }}"
          if [ -z "$IMAGE_NAME" ]; then IMAGE_NAME="$REPO"; fi
          IMAGE_NAME=$(echo "$IMAGE_NAME" | tr '[:upper:]' '[:lower:]')

          # Gitea exposes server URL like https://gitea.example.com
          # Prefer explicit var GITEA_REGISTRY; else, use the same host as Gitea server
          if [ -n "${{ vars.GITEA_REGISTRY }}" ]; then
            REGISTRY="${{ vars.GITEA_REGISTRY }}"
          else
            REGISTRY=$(echo "${{ gitea.server_url }}" | sed -E 's#^https?://##; s#/$##')
          fi

          echo "registry=$REGISTRY" >> "$GITHUB_OUTPUT"
          echo "owner=$OWNER" >> "$GITHUB_OUTPUT"
          echo "image=$IMAGE_NAME" >> "$GITHUB_OUTPUT"

      - name: Log in to Gitea Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ steps.vars.outputs.registry }}
          username: ${{ gitea.actor }}
          password: ${{ secrets.GITEA_TOKEN }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ steps.vars.outputs.registry }}/${{ steps.vars.outputs.owner }}/${{ steps.vars.outputs.image }}
          tags: |
            type=raw,value=latest,enable=${{ gitea.ref_type == 'branch' && (gitea.ref == 'refs/heads/main' || gitea.ref == 'refs/heads/master') }}
            type=ref,event=branch
            type=ref,event=tag
            type=sha,format=short

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ${{ env.DOCKERFILE }}
          platforms: linux/amd64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ steps.vars.outputs.registry }}/${{ steps.vars.outputs.owner }}/${{ steps.vars.outputs.image }}:buildcache
          cache-to: type=registry,ref=${{ steps.vars.outputs.registry }}/${{ steps.vars.outputs.owner }}/${{ steps.vars.outputs.image }}:buildcache,mode=max