name: Build and Push Docker Images

on:
  push:
    branches: [ main ]
    tags: [ 'v*' ]
    paths:
      - 'backend/**'
      - 'frontend/**'
      - '.github/workflows/docker-build.yml'
  workflow_dispatch:

jobs:
  changes:
    runs-on: docker
    container:
      image: ghcr.io/catthehacker/ubuntu:act-latest
    outputs:
      backend: ${{ steps.filter.outputs.backend }}
      frontend: ${{ steps.filter.outputs.frontend }}
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Needed to get all history for path filtering

      - name: Check for changed files
        id: filter
        run: |
          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
            # If manually triggered, build both
            echo "backend=true" >> $GITHUB_OUTPUT
            echo "frontend=true" >> $GITHUB_OUTPUT
          elif [[ "${{ github.ref }}" == refs/tags/* ]]; then
            # If it's a tag, build both
            echo "backend=true" >> $GITHUB_OUTPUT
            echo "frontend=true" >> $GITHUB_OUTPUT
          else
            # Check which directories have changes
            git fetch origin main
          
            if git diff --name-only origin/main..HEAD | grep -q "^backend/"; then
              echo "backend=true" >> $GITHUB_OUTPUT
            else
              echo "backend=false" >> $GITHUB_OUTPUT
            fi
          
            if git diff --name-only origin/main..HEAD | grep -q "^frontend/"; then
              echo "frontend=true" >> $GITHUB_OUTPUT
            else
              echo "frontend=false" >> $GITHUB_OUTPUT
            fi
          fi

  build-backend:
    needs: changes
    if: needs.changes.outputs.backend == 'true'
    runs-on: docker
    container:
      image: ghcr.io/catthehacker/ubuntu:act-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

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

      - name: Login to Gitea Registry
        uses: docker/login-action@v3
        with:
          registry: gitea.pragmazest.com
          username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
          password: ${{ secrets.DOCKER_REGISTRY_ACCESS_TOKEN }}

      - name: Extract metadata
        id: meta
        run: |
          if [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION=${GITHUB_REF#refs/tags/v}
          else
            VERSION=latest
          fi
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "date=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT

      - name: Build and push backend
        uses: docker/build-push-action@v5
        with:
          context: ./backend
          file: ./backend/Dockerfile
          push: true
          target: production
          tags: |
            gitea.pragmazest.com/${{ github.repository }}/backend:${{ steps.meta.outputs.version }}
            gitea.pragmazest.com/${{ github.repository }}/backend:latest
          labels: |
            org.opencontainers.image.created=${{ steps.meta.outputs.date }}
            org.opencontainers.image.version=${{ steps.meta.outputs.version }}
            org.opencontainers.image.revision=${{ github.sha }}

      - name: Image digest
        run: |
          echo "Backend image: gitea.pragmazest.com/${{ github.repository }}/backend:${{ steps.meta.outputs.version }}"

  build-frontend:
    needs: changes
    if: needs.changes.outputs.frontend == 'true'
    runs-on: docker
    container:
      image: ghcr.io/catthehacker/ubuntu:act-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

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

      - name: Login to Gitea Registry
        uses: docker/login-action@v3
        with:
          registry: gitea.pragmazest.com
          username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
          password: ${{ secrets.DOCKER_REGISTRY_ACCESS_TOKEN }}

      - name: Extract metadata
        id: meta
        run: |
          if [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION=${GITHUB_REF#refs/tags/v}
          else
            VERSION=latest
          fi
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "date=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT

      - name: Build and push frontend
        uses: docker/build-push-action@v5
        with:
          context: ./frontend
          file: ./frontend/Dockerfile
          push: true
          target: runner
          tags: |
            gitea.pragmazest.com/${{ github.repository }}/frontend:${{ steps.meta.outputs.version }}
            gitea.pragmazest.com/${{ github.repository }}/frontend:latest
          labels: |
            org.opencontainers.image.created=${{ steps.meta.outputs.date }}
            org.opencontainers.image.version=${{ steps.meta.outputs.version }}
            org.opencontainers.image.revision=${{ github.sha }}

      - name: Image digest
        run: |
          echo "Frontend image: gitea.pragmazest.com/${{ github.repository }}/frontend:${{ steps.meta.outputs.version }}"