name: 'Build and Push Image'
description: 'Build a container image with Docker and push to zot registry via Tailscale sidecar'

# Uses a Tailscale sidecar container to push images to the registry.
# This works around Docker Desktop's VM not having access to the tailnet.
#
# Flow:
# 1. Start Tailscale sidecar container (joins tailnet)
# 2. Build image with docker build
# 3. Save image to OCI tarball
# 4. Push tarball to registry using skopeo (via Tailscale network)
# 5. Cleanup sidecar

inputs:
  context:
    description: 'Build context path'
    required: true
  dockerfile:
    description: 'Dockerfile path (relative to context)'
    required: false
    default: 'Dockerfile'
  image_name:
    description: 'Image name (without registry, e.g. blumeops/devpi)'
    required: true
  version:
    description: 'Version tag (e.g. v1.0.0)'
    required: true
  registry:
    description: 'Registry URL'
    required: false
    default: 'registry.tail8d86e.ts.net'
  tailscale_authkey:
    description: 'Tailscale OAuth client secret for ci-gateway'
    required: true

runs:
  using: 'composite'
  steps:
    - name: Start Tailscale sidecar
      shell: bash
      run: |
        echo "Starting Tailscale sidecar..."

        # Clean up any existing sidecar
        docker rm -f ts-ci-gateway 2>/dev/null || true

        # Start Tailscale container
        docker run -d \
          --name ts-ci-gateway \
          --hostname ci-gateway \
          -e TS_AUTHKEY="${{ inputs.tailscale_authkey }}" \
          -e TS_EXTRA_ARGS="--advertise-tags=tag:ci-gateway" \
          -e TS_ACCEPT_DNS=true \
          -e TS_USERSPACE=true \
          tailscale/tailscale:latest

        # Wait for Tailscale to connect
        echo "Waiting for Tailscale to connect..."
        for i in {1..30}; do
          # Check if container is still running
          if ! docker ps -q -f name=ts-ci-gateway | grep -q .; then
            echo "ERROR: Tailscale container exited unexpectedly!"
            echo "Container logs:"
            docker logs ts-ci-gateway 2>&1 || true
            exit 1
          fi

          if docker exec ts-ci-gateway tailscale status >/dev/null 2>&1; then
            echo "Tailscale connected!"
            docker exec ts-ci-gateway tailscale status
            break
          fi
          echo "  Attempt $i/30..."
          sleep 2
        done

        # Verify DNS resolution
        echo "Testing DNS resolution..."
        docker exec ts-ci-gateway nslookup ${{ inputs.registry }} || echo "DNS test failed, continuing anyway..."

    - name: Build image with Docker
      shell: bash
      run: |
        echo "Building ${{ inputs.image_name }}:${{ inputs.version }}"
        docker build \
          --tag ${{ inputs.image_name }}:${{ inputs.version }} \
          --tag ${{ inputs.image_name }}:${{ github.sha }} \
          --file ${{ inputs.context }}/${{ inputs.dockerfile }} \
          ${{ inputs.context }}

    - name: Save image to tarball
      shell: bash
      run: |
        echo "Saving image to tarball..."
        mkdir -p /tmp/ci-images
        docker save ${{ inputs.image_name }}:${{ inputs.version }} -o /tmp/ci-images/image.tar
        ls -lh /tmp/ci-images/image.tar

    - name: Push to registry via Tailscale
      shell: bash
      run: |
        echo "Pushing ${{ inputs.image_name }}:${{ inputs.version }} via Tailscale sidecar..."

        # Copy tarball into the Tailscale container
        docker cp /tmp/ci-images/image.tar ts-ci-gateway:/tmp/image.tar

        # Get indri's Tailscale IP from tailscale status (registry runs on indri)
        echo "Getting indri's Tailscale IP..."
        echo "Tailscale status:"
        docker exec ts-ci-gateway tailscale status || true

        INDRI_IP=$(docker exec ts-ci-gateway tailscale status 2>/dev/null | grep -E '\bindri\b' | awk '{print $1}')

        if [ -z "$INDRI_IP" ]; then
          echo "ERROR: Could not get indri's Tailscale IP from tailscale status"
          exit 1
        fi
        echo "Indri Tailscale IP: $INDRI_IP"

        # Install skopeo and push
        docker exec ts-ci-gateway sh -c "
          apk add --no-cache skopeo >/dev/null 2>&1

          # Add registry hostname pointing to indri's Tailscale IP
          echo '$INDRI_IP ${{ inputs.registry }}' >> /etc/hosts
          echo 'Added /etc/hosts entry: $INDRI_IP ${{ inputs.registry }}'

          echo 'Pushing version tag...'
          skopeo copy \
            --dest-tls-verify=false \
            docker-archive:/tmp/image.tar \
            docker://${{ inputs.registry }}/${{ inputs.image_name }}:${{ inputs.version }}

          echo 'Pushing SHA tag...'
          skopeo copy \
            --dest-tls-verify=false \
            docker-archive:/tmp/image.tar \
            docker://${{ inputs.registry }}/${{ inputs.image_name }}:${{ github.sha }}
        "

    - name: Cleanup
      shell: bash
      if: always()
      run: |
        echo "Cleaning up..."
        docker rm -f ts-ci-gateway 2>/dev/null || true
        rm -rf /tmp/ci-images

    - name: Summary
      shell: bash
      run: |
        echo "Built and pushed:"
        echo "   ${{ inputs.registry }}/${{ inputs.image_name }}:${{ inputs.version }}"
        echo "   ${{ inputs.registry }}/${{ inputs.image_name }}:${{ github.sha }}"
        echo ""
        echo "Registry tags:"
        curl -sf "https://${{ inputs.registry }}/v2/${{ inputs.image_name }}/tags/list" | jq -r '.tags[]' | sort -V | tail -10 || true