name: Generate SBOM

on:
  workflow_run:
    workflows: ["Build and Publish Release"]
    types:
      - completed
  workflow_dispatch:
    inputs:
      release_version:
        description: "Version of the release to generate SBOM for"
        required: true
  pull_request:
    branches:
      - develop

permissions: read-all

concurrency:
  group: sbom-${{ github.ref }}
  cancel-in-progress: true

env:
  REGISTRY: ghcr.io

jobs:
  generate-sbom:
    runs-on: ubuntu-latest
    if: github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success'
    permissions:
      contents: ${{ github.event_name == 'pull_request' && 'read' || 'write' }}
      actions: read
      packages: read
    steps:
      - name: Checkout Repo (for version detection)
        if: github.event_name == 'workflow_run'
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get Version From Workflow Run
        id: tag
        if: github.event_name == 'workflow_run'
        run: |
          # Get the SHA from the workflow run
          SHA="${{ github.event.workflow_run.head_sha }}"
          # Find the tag pointing to this SHA
          TAG=$(git tag --points-at $SHA | grep '^v[0-9]' | head -1)
          if [ -z "$TAG" ]; then
            echo "Error: No version tag found for SHA $SHA"
            exit 1
          fi
          echo "TRIGGERED_TAG=$TAG" >> $GITHUB_ENV
          echo "Found tag: $TAG"

      - name: Determine Version Number
        id: version_number
        run: |
          if [ "${{ github.event_name }}" == "workflow_run" ]; then
            version=$TRIGGERED_TAG
          elif [ -n "${{ inputs.release_version }}" ]; then
            version=${{ inputs.release_version }}
          else
            version=""
          fi
          if [[ ${version:0:1} == "v" ]];
          then
            echo "RELEASE_VERSION=${version:1}" >> $GITHUB_OUTPUT
          else
            echo "RELEASE_VERSION=$version" >> $GITHUB_OUTPUT
          fi

      - name: Make Branch Name
        id: branch
        if: github.event_name != 'pull_request'
        env:
          RELEASE_VERSION: ${{ steps.version_number.outputs.RELEASE_VERSION }}
        run: |
          echo "BRANCH_NAME=v${RELEASE_VERSION%.*}" >> $GITHUB_OUTPUT

      - name: Checkout Repo
        if: github.event_name != 'workflow_run'
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event_name != 'pull_request' && steps.branch.outputs.BRANCH_NAME || '' }}

      - name: Set OpenCost Image Tag
        id: image_tag
        if: github.event_name != 'pull_request'
        env:
          REPO_OWNER: ${{ github.repository_owner }}
          RELEASE_VERSION: ${{ steps.version_number.outputs.RELEASE_VERSION }}
        run: |
          echo "IMAGE_TAG=ghcr.io/$REPO_OWNER/opencost:$RELEASE_VERSION" >> $GITHUB_OUTPUT

      # Generate SBOM for source code
      - name: Generate SBOM for Source Code
        uses: anchore/sbom-action@v0
        with:
          path: .
          artifact-name: opencost-source-sbom.spdx.json
          output-file: opencost-source-sbom.spdx.json
          format: spdx-json

      # Generate SBOM for container image
      - name: Generate SBOM for Container Image
        if: github.event_name != 'pull_request'
        uses: anchore/sbom-action@v0
        with:
          image: ${{ steps.image_tag.outputs.IMAGE_TAG }}
          artifact-name: opencost-container-sbom.spdx.json
          output-file: opencost-container-sbom.spdx.json
          format: spdx-json

      # Generate CycloneDX format as well for broader compatibility
      - name: Generate CycloneDX SBOM for Source Code
        uses: anchore/sbom-action@v0
        with:
          path: .
          artifact-name: opencost-source-sbom.cyclonedx.json
          output-file: opencost-source-sbom.cyclonedx.json
          format: cyclonedx-json

      # Display SBOM contents on PRs for review
      - name: Display SBOM Contents
        if: github.event_name == 'pull_request'
        run: |
          echo "## SBOM Contents (SPDX Format)" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Package Count" >> $GITHUB_STEP_SUMMARY
          PACKAGE_COUNT=$(jq '.packages | length' opencost-source-sbom.spdx.json)
          echo "Total packages: $PACKAGE_COUNT" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Top-level Packages" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          jq -r '.packages[] | select(.name != null) | "\(.name) - \(.versionInfo // "unknown")"' opencost-source-sbom.spdx.json | head -50 >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "<details>" >> $GITHUB_STEP_SUMMARY
          echo "<summary>Full SPDX SBOM (click to expand)</summary>" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo '```json' >> $GITHUB_STEP_SUMMARY
          cat opencost-source-sbom.spdx.json >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          echo "</details>" >> $GITHUB_STEP_SUMMARY

      - name: Generate CycloneDX SBOM for Container Image
        if: github.event_name != 'pull_request'
        uses: anchore/sbom-action@v0
        with:
          image: ${{ steps.image_tag.outputs.IMAGE_TAG }}
          artifact-name: opencost-container-sbom.cyclonedx.json
          output-file: opencost-container-sbom.cyclonedx.json
          format: cyclonedx-json

      # Publish SBOMs to GitHub release (only for releases, not PRs)
      - name: Attach SBOMs to GitHub Release
        if: github.event_name != 'pull_request'
        uses: anchore/sbom-action/publish-sbom@v0
        with:
          sbom-artifact-match: ".*\\.spdx\\.json$|.*\\.cyclonedx\\.json$"

      # Create a summary of the SBOM generation
      - name: Generate Summary
        run: |
          echo "## SBOM Generation Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ Generated SBOMs for OpenCost ${{ steps.version_number.outputs.RELEASE_VERSION || 'PR build' }}" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Generated Artifacts:" >> $GITHUB_STEP_SUMMARY
          echo "- Source Code SBOM (SPDX)" >> $GITHUB_STEP_SUMMARY
          echo "- Source Code SBOM (CycloneDX)" >> $GITHUB_STEP_SUMMARY
          if [ "${{ github.event_name }}" != "pull_request" ]; then
            echo "- Container Image SBOM (SPDX)" >> $GITHUB_STEP_SUMMARY
            echo "- Container Image SBOM (CycloneDX)" >> $GITHUB_STEP_SUMMARY
          fi
          echo "" >> $GITHUB_STEP_SUMMARY
          if [ "${{ github.event_name }}" != "pull_request" ]; then
            echo "📦 SBOMs have been attached to the GitHub release" >> $GITHUB_STEP_SUMMARY
          fi