name: Build Latest Docker Image on Release

on:
  release:
    types: [published]
  workflow_dispatch:

permissions:
  contents: read
  id-token: write
  packages: write

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0  # Fetch all history for tags

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: "3.x"

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install cosign
        uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6  # v4.1.2

      - name: Get latest tag
        id: get_tag
        run: |
          if [ "${{ github.event_name }}" = "release" ] && [ -n "${{ github.event.release.tag_name }}" ]; then
            TAG="${{ github.event.release.tag_name }}"
          else
            TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
          fi
          if [ -z "$TAG" ]; then
            echo "No git tag found for docker publish"
            exit 1
          fi
          PACKAGE_VERSION="${TAG#v}"
          echo "Found tag: $TAG"
          echo "tag=$TAG" >> $GITHUB_OUTPUT
          echo "package_version=$PACKAGE_VERSION" >> $GITHUB_OUTPUT

      - name: Check if pre-release
        id: check_prerelease
        run: |
          TAG="${{ steps.get_tag.outputs.tag }}"
          if [[ "$TAG" == *"rc"* ]] || [[ "$TAG" == *"dev"* ]]; then
            echo "is_prerelease=true" >> $GITHUB_OUTPUT
            echo "This is a pre-release version: $TAG"
          else
            echo "is_prerelease=false" >> $GITHUB_OUTPUT
            echo "This is a stable release: $TAG"
          fi

      - name: Update version definitions
        run: |
          python scripts/release/set_version.py --core-version "${{ steps.get_tag.outputs.package_version }}"
          echo "Updated version definitions with ${{ steps.get_tag.outputs.package_version }}"
          grep '__version__ = ' lightrag/_version.py

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=${{ steps.get_tag.outputs.tag }}
            type=raw,value=latest,enable=${{ steps.check_prerelease.outputs.is_prerelease == 'false' }}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Sign Docker image
        if: steps.build-and-push.outputs.digest != ''
        env:
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
          TAGS: ${{ steps.meta.outputs.tags }}
        run: |
          set -euo pipefail
          echo "Signing manifest digest: $DIGEST"
          while IFS= read -r tag; do
            if [ -z "$tag" ]; then
              continue
            fi
            echo "Signing ${tag}@${DIGEST}"
            cosign sign --yes "${tag}@${DIGEST}"
          done <<< "$TAGS"

      - name: Output image details
        run: |
          echo "Docker image built and pushed successfully!"
          echo "Image tags:"
          echo "  - ghcr.io/${{ github.repository }}:${{ steps.get_tag.outputs.tag }}"
          echo "  - ghcr.io/${{ github.repository }}:latest"
          echo "Signed manifest digest: ${{ steps.build-and-push.outputs.digest }}"
          echo "Latest Git tag used: ${{ steps.get_tag.outputs.tag }}"