name: Build & Push Docker Image to Gitea Registry

on:
  push:
    branches: [master]

env:
  REGISTRY: git.mischlabs.de
  REGISTRY_IMAGE: git.mischlabs.de/mrdiderot/mischlabs

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Docker CLI
        shell: sh
        run: |
          if ! command -v docker >/dev/null 2>&1; then
            echo "Docker CLI not found. Installing static binary..."
            if command -v curl >/dev/null 2>&1; then
              curl -fsSL https://download.docker.com/linux/static/stable/x86_64/docker-26.1.4.tgz | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
            elif command -v wget >/dev/null 2>&1; then
              wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-26.1.4.tgz | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
            else
              echo "Neither curl nor wget found! Attempting package manager install..."
              if command -v apt-get >/dev/null 2>&1; then
                apt-get update && apt-get install -y docker.io
              elif command -v apk >/dev/null 2>&1; then
                apk add --no-cache docker-cli
              else
                echo "Cannot install Docker CLI!"
                exit 1
              fi
            fi
          else
            echo "Docker CLI already installed."
          fi
          docker --version

      - name: Log in to Gitea Package Registry
        shell: sh
        run: |
          if [ -z "${{ secrets.REGISTRY_USER }}" ] || [ -z "${{ secrets.REGISTRY_TOKEN }}" ]; then
            echo "Missing registry credentials."
            echo "Create repository secrets REGISTRY_USER and REGISTRY_TOKEN."
            echo "REGISTRY_TOKEN must be a Gitea access token with package write permission."
            exit 1
          fi
          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login "${{ env.REGISTRY }}" -u "${{ secrets.REGISTRY_USER }}" --password-stdin

      - name: Build and push Docker image
        shell: sh
        run: |
          docker build -t ${{ env.REGISTRY_IMAGE }}:latest -t ${{ env.REGISTRY_IMAGE }}:${{ github.sha }} .
          docker push ${{ env.REGISTRY_IMAGE }}:latest
          docker push ${{ env.REGISTRY_IMAGE }}:${{ github.sha }}