name: Executor

on:
  schedule:
    - cron: "0 6 * * *" # Daily at 6 AM UTC
  workflow_dispatch: # Allow manual triggering

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: aevea/action-kaniko/executor
  SOURCE_REPO: chainguard-forks/kaniko

jobs:
  check-and-build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Get latest tag from source repo
        id: source-tag
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          LATEST_TAG=$(gh release view --repo ${{ env.SOURCE_REPO }} --json tagName -q '.tagName' 2>/dev/null || true)
          if [ -z "$LATEST_TAG" ]; then
            # Fallback to tags if no releases
            LATEST_TAG=$(gh api repos/${{ env.SOURCE_REPO }}/tags --jq '.[0].name')
          fi
          echo "tag=$LATEST_TAG" >> $GITHUB_OUTPUT
          echo "Latest source tag: $LATEST_TAG"

      - name: Check if tag already exists in registry
        id: check-tag
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Check if the image with this tag already exists using GitHub Packages API
          EXISTING_TAGS=$(gh api /users/aevea/packages/container/action-kaniko%2Fexecutor/versions --jq '.[].metadata.container.tags[]' 2>/dev/null || true)

          if echo "$EXISTING_TAGS" | grep -qx "${{ steps.source-tag.outputs.tag }}"; then
            echo "exists=true" >> $GITHUB_OUTPUT
            echo "Tag ${{ steps.source-tag.outputs.tag }} already exists, skipping build"
          else
            echo "exists=false" >> $GITHUB_OUTPUT
            echo "Tag ${{ steps.source-tag.outputs.tag }} does not exist, will build"
          fi

      - name: Checkout source repository
        if: steps.check-tag.outputs.exists == 'false'
        uses: actions/checkout@v6
        with:
          repository: ${{ env.SOURCE_REPO }}
          ref: ${{ steps.source-tag.outputs.tag }}

      - name: Set up Docker Buildx
        if: steps.check-tag.outputs.exists == 'false'
        uses: docker/setup-buildx-action@v3

      - name: Log in to GitHub Container Registry
        if: steps.check-tag.outputs.exists == 'false'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push executor image
        if: steps.check-tag.outputs.exists == 'false'
        uses: docker/build-push-action@v6
        with:
          context: .
          file: deploy/Dockerfile
          target: kaniko-executor
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.source-tag.outputs.tag }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
          build-args: |
            TARGETARCH=amd64
            TARGETOS=linux
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Summary
        run: |
          if [ "${{ steps.check-tag.outputs.exists }}" = "true" ]; then
            echo "## Build Skipped" >> $GITHUB_STEP_SUMMARY
            echo "Tag \`${{ steps.source-tag.outputs.tag }}\` already exists in the registry." >> $GITHUB_STEP_SUMMARY
          else
            echo "## Build Complete" >> $GITHUB_STEP_SUMMARY
            echo "Successfully built and pushed \`${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.source-tag.outputs.tag }}\`" >> $GITHUB_STEP_SUMMARY
          fi