name: Docker Build

on:
  push:
    branches: [main]
    tags: ["v*"]
  pull_request:
    branches: [main]

env:
  REGISTRY: ${{ github.server_url == 'https://github.com' && 'ghcr.io' || format('{0}/v2', github.server_url) }}
  IMAGE_PREFIX: ${{ github.repository }}

permissions:
  contents: read
  packages: write

jobs:
  build-backend:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

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

      - name: Log in to registry (push only) - GitHub
        if: github.event_name == 'push' && github.server_url == 'https://github.com'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Log in to registry (push only) - Gitea
        if: github.event_name == 'push' && github.server_url != 'https://github.com'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.GITEA_USERNAME || github.actor }}
          password: ${{ secrets.GITEA_TOKEN || secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/backend
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=sha

      - name: Build and push backend image
        uses: docker/build-push-action@v6
        with:
          context: .
          file: backend/Dockerfile
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  build-frontend:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

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

      - name: Log in to registry (push only) - GitHub
        if: github.event_name == 'push' && github.server_url == 'https://github.com'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Log in to registry (push only) - Gitea
        if: github.event_name == 'push' && github.server_url != 'https://github.com'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.GITEA_USERNAME || github.actor }}
          password: ${{ secrets.GITEA_TOKEN || secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/frontend
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=sha

      - name: Build and push frontend image
        uses: docker/build-push-action@v6
        with:
          context: ./frontend
          file: frontend/Dockerfile
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max