name: Docker

on:
  # Trigger when a release is published (after assets are uploaded)
  release:
    types: [published]

  # Optional manual trigger
  workflow_dispatch:
    inputs:
      version:
        description: 'Release tag to use (e.g., v1.0.0 or latest)'
        required: false
        default: 'latest'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

permissions:
  contents: read
  packages: write

jobs:
  build-and-push:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest

    # For release event, only build for tags like v1.2.3
    if: |
      github.event_name == 'workflow_dispatch' ||
      (github.event_name == 'release' && startsWith(github.event.release.tag_name, 'v'))

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

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

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Resolve VERSION:
      # - release event: use release tag_name (e.g., v0.3.0)
      # - workflow_dispatch: use input version (default: latest)
      - name: Get version
        id: version
        run: |
          if [ "${{ github.event_name }}" = "release" ]; then
            v="${{ github.event.release.tag_name }}"
          else
            v="${{ github.event.inputs.version }}"
            if [ -z "$v" ]; then
              v="latest"
            fi
          fi

          echo "VERSION=$v" >> "$GITHUB_OUTPUT"
          echo "Resolved VERSION=$v"

      # Ensure release assets exist before building
      - name: Check release assets
        id: check_assets
        run: |
          VERSION="${{ steps.version.outputs.VERSION }}"
          REPO="${{ github.repository }}"

          echo "Checking assets for $REPO, VERSION=$VERSION"

          # For 'latest', we can only reliably ask the latest release API,
          # the asset names are still versioned (drip-vX.Y.Z-linux-arch).
          if [ "$VERSION" = "latest" ]; then
            API_URL="https://api.github.com/repos/${REPO}/releases/latest"
            echo "Using latest release API: $API_URL"
            json=$(curl -fsSL "$API_URL")

            # Check that assets for both amd64 and arm64 exist
            echo "$json" | grep -q 'drip-.*linux-amd64' || missing_amd64=1
            echo "$json" | grep -q 'drip-.*linux-arm64' || missing_arm64=1

            if [ "${missing_amd64:-0}" -eq 0 ] && [ "${missing_arm64:-0}" -eq 0 ]; then
              echo "assets_ready=true" >> "$GITHUB_OUTPUT"
              echo "Assets found for both linux-amd64 and linux-arm64 (latest)."
            else
              echo "assets_ready=false" >> "$GITHUB_OUTPUT"
              echo "Required assets for latest release are missing; build will be skipped."
            fi
            exit 0
          fi

          # For a specific version tag (e.g., v0.3.0) check direct download URLs
          archs="amd64 arm64"
          missing=0

          for arch in $archs; do
            url="https://github.com/${REPO}/releases/download/${VERSION}/drip-${VERSION}-linux-${arch}"
            status=$(curl -o /dev/null -w "%{http_code}" -sL "$url")
            echo "[$arch] HTTP $status -> $url"
            if [ "$status" != "200" ]; then
              missing=1
            fi
          done

          if [ "$missing" -eq 0 ]; then
            echo "assets_ready=true" >> "$GITHUB_OUTPUT"
            echo "All required assets exist. Proceeding with build."
          else
            echo "assets_ready=false" >> "$GITHUB_OUTPUT"
            echo "Required assets are missing; build will be skipped."
          fi

      - name: Skip build (assets not ready)
        if: steps.check_assets.outputs.assets_ready != 'true'
        run: |
          echo "Release assets are not ready. Docker image build is skipped."
          echo "You must upload all required release files (drip-<version>-linux-amd64/arm64) first."

      - name: Extract metadata (tags & labels)
        id: meta
        if: steps.check_assets.outputs.assets_ready == 'true'
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            # Main tag, e.g. v0.3.0 or latest
            type=raw,value=${{ steps.version.outputs.VERSION }}
            # Also tag 'latest' for convenience when using a specific version
            type=raw,value=latest,enable=${{ steps.version.outputs.VERSION != 'latest' }}

      - name: Build and push
        if: steps.check_assets.outputs.assets_ready == 'true'
        uses: docker/build-push-action@v5
        with:
          context: .
          file: deployments/Dockerfile.release
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            VERSION=${{ steps.version.outputs.VERSION }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Generate deployment summary
        if: steps.check_assets.outputs.assets_ready == 'true'
        run: |
          echo "## 🐳 Docker Image Published" >> "$GITHUB_STEP_SUMMARY"
          echo "" >> "$GITHUB_STEP_SUMMARY"
          echo "**Version (GitHub Release tag or 'latest'):** \`${{ steps.version.outputs.VERSION }}\`" >> "$GITHUB_STEP_SUMMARY"
          echo "" >> "$GITHUB_STEP_SUMMARY"
          echo "### Pull from GHCR" >> "$GITHUB_STEP_SUMMARY"
          echo "\`\`\`bash" >> "$GITHUB_STEP_SUMMARY"
          echo "docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.VERSION }}" >> "$GITHUB_STEP_SUMMARY"
          echo "\`\`\`" >> "$GITHUB_STEP_SUMMARY"
          echo "" >> "$GITHUB_STEP_SUMMARY"
          echo "### Quick start" >> "$GITHUB_STEP_SUMMARY"
          echo "\`\`\`bash" >> "$GITHUB_STEP_SUMMARY"
          echo "docker run -d \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  --name drip-server \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  -p 443:443 \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  -v /path/to/certs:/app/data/certs:ro \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.VERSION }} \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  server --domain your.domain.com --port 443 \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  --tls-cert /app/data/certs/fullchain.pem \\\\" >> "$GITHUB_STEP_SUMMARY"
          echo "  --tls-key /app/data/certs/privkey.pem" >> "$GITHUB_STEP_SUMMARY"
          echo "\`\`\`" >> "$GITHUB_STEP_SUMMARY"