# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
---
name: Supply Chain Verification (PR)

on:
  workflow_dispatch:
    inputs:
      pr_number:
        description: "PR number to verify (optional, will auto-detect from workflow_run)"
        required: false
        type: string
  pull_request:
  push:
    branches:
      - main

concurrency:
  group: supply-chain-pr-${{ github.event.workflow_run.event || github.event_name }}-${{ github.event.workflow_run.head_branch || github.ref }}
  cancel-in-progress: true

permissions:
  contents: read
  pull-requests: write
  security-events: write
  actions: read

jobs:
  verify-supply-chain:
    name: Verify Supply Chain
    runs-on: ubuntu-latest
    timeout-minutes: 15
    # Run for: manual dispatch, or successful workflow_run triggered by push/PR
    if: >
      github.event_name == 'workflow_dispatch' ||
      github.event_name == 'pull_request' ||
      (github.event_name == 'workflow_run' &&
       (github.event.workflow_run.event == 'push' || github.event.workflow_run.pull_requests[0].number != null) &&
       (github.event.workflow_run.status != 'completed' || github.event.workflow_run.conclusion == 'success'))

    steps:
      - name: Checkout repository
        # actions/checkout v4.2.2
        uses: actions/checkout@0c366fd6a839edf440554fa01a7085ccba70ac98

      - name: Extract PR number from workflow_run
        id: pr-number
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          INPUT_PR_NUMBER: ${{ inputs.pr_number }}
          EVENT_NAME: ${{ github.event_name }}
          HEAD_SHA: ${{ github.event.workflow_run.head_sha || github.event.pull_request.head.sha || github.sha }}
          HEAD_BRANCH: ${{ github.event.workflow_run.head_branch || github.head_ref || github.ref_name }}
          WORKFLOW_RUN_EVENT: ${{ github.event.workflow_run.event }}
          REPO_OWNER: ${{ github.repository_owner }}
          REPO_NAME: ${{ github.repository }}
        run: |
          if [[ -n "${INPUT_PR_NUMBER}" ]]; then
            echo "pr_number=${INPUT_PR_NUMBER}" >> "$GITHUB_OUTPUT"
            echo "📋 Using manually provided PR number: ${INPUT_PR_NUMBER}"
            exit 0
          fi

          if [[ "${EVENT_NAME}" != "workflow_run" && "${EVENT_NAME}" != "push" && "${EVENT_NAME}" != "pull_request" ]]; then
            echo "❌ No PR number provided and not triggered by workflow_run/push/pr"
            echo "pr_number=" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "🔍 Looking for PR with head SHA: ${HEAD_SHA}"
          echo "🔍 Head branch: ${HEAD_BRANCH}"

          # Search for PR by head SHA
          PR_NUMBER=$(gh api \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            "/repos/${REPO_NAME}/pulls?state=open&head=${REPO_OWNER}:${HEAD_BRANCH}" \
            --jq '.[0].number // empty' 2>/dev/null || echo "")

          if [[ -z "${PR_NUMBER}" ]]; then
            # Fallback: search by commit SHA
            PR_NUMBER=$(gh api \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${REPO_NAME}/commits/${HEAD_SHA}/pulls" \
              --jq '.[0].number // empty' 2>/dev/null || echo "")
          fi

          if [[ -z "${PR_NUMBER}" ]]; then
            echo "⚠️ Could not find PR number for this workflow run"
            echo "pr_number=" >> "$GITHUB_OUTPUT"
          else
            echo "pr_number=${PR_NUMBER}" >> "$GITHUB_OUTPUT"
            echo "✅ Found PR number: ${PR_NUMBER}"
          fi

          # Check if this is a push event (not a PR)
          if [[ "${WORKFLOW_RUN_EVENT}" == "push" || "${EVENT_NAME}" == "push" || -z "${PR_NUMBER}" ]]; then
            echo "is_push=true" >> "$GITHUB_OUTPUT"
            echo "✅ Detected push build from branch: ${HEAD_BRANCH}"
          else
            echo "is_push=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Sanitize branch name
        id: sanitize
        env:
          BRANCH_NAME: ${{ github.event.workflow_run.head_branch || github.head_ref || github.ref_name }}
        run: |
          # Sanitize branch name for use in artifact names
          # Replace / with - to avoid invalid reference format errors
          SANITIZED=$(echo "$BRANCH_NAME" | tr '/' '-')
          echo "branch=${SANITIZED}" >> "$GITHUB_OUTPUT"
          echo "📋 Sanitized branch name: ${BRANCH_NAME} -> ${SANITIZED}"

      - name: Check for PR image artifact
        id: check-artifact
        if: github.event_name == 'workflow_run' && (steps.pr-number.outputs.pr_number != '' || steps.pr-number.outputs.is_push == 'true')
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          IS_PUSH: ${{ steps.pr-number.outputs.is_push }}
          PR_NUMBER: ${{ steps.pr-number.outputs.pr_number }}
          RUN_ID: ${{ github.event.workflow_run.id }}
          HEAD_SHA: ${{ github.event.workflow_run.head_sha || github.event.pull_request.head.sha || github.sha }}
          REPO_NAME: ${{ github.repository }}
        run: |
          # Determine artifact name based on event type
          if [[ "${IS_PUSH}" == "true" ]]; then
            ARTIFACT_NAME="push-image"
          else
            ARTIFACT_NAME="pr-image-${PR_NUMBER}"
          fi

          echo "🔍 Looking for artifact: ${ARTIFACT_NAME}"

          if [[ -n "${RUN_ID}" ]]; then
            # Search in the triggering workflow run
            ARTIFACT_ID=$(gh api \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${REPO_NAME}/actions/runs/${RUN_ID}/artifacts" \
              --jq ".artifacts[] | select(.name == \"${ARTIFACT_NAME}\") | .id" 2>/dev/null || echo "")
          else
            # If RUN_ID is empty (push/pr trigger), try to find a recent successful run for this SHA
            echo "🔍 Searching for workflow run for SHA: ${HEAD_SHA}"
            # Retry a few times as the run might be just starting or finishing
            for i in {1..3}; do
               RUN_ID=$(gh api \
                  -H "Accept: application/vnd.github+json" \
                  -H "X-GitHub-Api-Version: 2022-11-28" \
                  "/repos/${REPO_NAME}/actions/workflows/docker-build.yml/runs?head_sha=${HEAD_SHA}&status=success&per_page=1" \
                  --jq '.workflow_runs[0].id // empty' 2>/dev/null || echo "")
               if [[ -n "${RUN_ID}" ]]; then
                  echo "✅ Found Run ID: ${RUN_ID}"
                  break
               fi
               echo "⏳ Waiting for workflow run to appear/complete... ($i/3)"
               sleep 5
            done

            if [[ -n "${RUN_ID}" ]]; then
               ARTIFACT_ID=$(gh api \
                 -H "Accept: application/vnd.github+json" \
                 -H "X-GitHub-Api-Version: 2022-11-28" \
                 "/repos/${REPO_NAME}/actions/runs/${RUN_ID}/artifacts" \
                 --jq ".artifacts[] | select(.name == \"${ARTIFACT_NAME}\") | .id" 2>/dev/null || echo "")
            fi
          fi

          if [[ -z "${ARTIFACT_ID}" ]]; then
            # Fallback for manual or missing info: search recent artifacts by name
            echo "🔍 Falling back to search by artifact name..."
            ARTIFACT_ID=$(gh api \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${REPO_NAME}/actions/artifacts?name=${ARTIFACT_NAME}" \
              --jq '.artifacts[0].id // empty' 2>/dev/null || echo "")
          fi

          if [[ -z "${ARTIFACT_ID}" ]]; then
            echo "⚠️ No artifact found: ${ARTIFACT_NAME}"
            echo "artifact_found=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          {
            echo "artifact_found=true"
            echo "artifact_id=${ARTIFACT_ID}"
            echo "artifact_name=${ARTIFACT_NAME}"
          } >> "$GITHUB_OUTPUT"
          echo "✅ Found artifact: ${ARTIFACT_NAME} (ID: ${ARTIFACT_ID})"

      - name: Skip if no artifact
        if: github.event_name == 'workflow_run' && ((steps.pr-number.outputs.pr_number == '' && steps.pr-number.outputs.is_push != 'true') || steps.check-artifact.outputs.artifact_found != 'true')
        run: |
          echo "ℹ️ No PR image artifact found - skipping supply chain verification"
          echo "This is expected if the Docker build did not produce an artifact for this PR"
          exit 0

      - name: Download PR image artifact
        if: github.event_name == 'workflow_run' && steps.check-artifact.outputs.artifact_found == 'true'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          ARTIFACT_ID: ${{ steps.check-artifact.outputs.artifact_id }}
          ARTIFACT_NAME: ${{ steps.check-artifact.outputs.artifact_name }}
          REPO_NAME: ${{ github.repository }}
        run: |
          echo "📦 Downloading artifact: ${ARTIFACT_NAME}"

          gh api \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            "/repos/${REPO_NAME}/actions/artifacts/${ARTIFACT_ID}/zip" \
            > artifact.zip

          unzip -o artifact.zip
          echo "✅ Artifact downloaded and extracted"

      - name: Load Docker image (Artifact)
        if: github.event_name == 'workflow_run' && steps.check-artifact.outputs.artifact_found == 'true'
        id: load-image-artifact
        run: |
          if [[ ! -f "charon-pr-image.tar" ]]; then
            echo "❌ charon-pr-image.tar not found in artifact"
            ls -la
            exit 1
          fi

          echo "🐳 Loading Docker image..."
          LOAD_OUTPUT=$(docker load -i charon-pr-image.tar)
          echo "${LOAD_OUTPUT}"

          # Extract image name from load output
          IMAGE_NAME=$(echo "${LOAD_OUTPUT}" | grep -oP 'Loaded image: \K.*' || echo "")

          if [[ -z "${IMAGE_NAME}" ]]; then
            # Try alternative format
            IMAGE_NAME=$(echo "${LOAD_OUTPUT}" | grep -oP 'Loaded image ID: \K.*' || echo "")
          fi

          if [[ -z "${IMAGE_NAME}" ]]; then
            # Fallback: list recent images
            IMAGE_NAME=$(docker images --format "{{.Repository}}:{{.Tag}}" | head -1)
          fi

          echo "image_name=${IMAGE_NAME}" >> "$GITHUB_OUTPUT"
          echo "✅ Loaded image: ${IMAGE_NAME}"

      - name: Build Docker image (Local)
        if: github.event_name != 'workflow_run'
        id: build-image-local
        run: |
          echo "🐳 Building Docker image locally..."
          docker build -t charon:local .
          echo "image_name=charon:local" >> "$GITHUB_OUTPUT"
          echo "✅ Built image: charon:local"

      - name: Set Target Image
        id: set-target
        run: |
          if [[ "${{ github.event_name }}" == "workflow_run" ]]; then
            echo "image_name=${{ steps.load-image-artifact.outputs.image_name }}" >> "$GITHUB_OUTPUT"
          else
            echo "image_name=${{ steps.build-image-local.outputs.image_name }}" >> "$GITHUB_OUTPUT"
          fi

      # Generate SBOM using official Anchore action (auto-updated by Renovate)
      - name: Generate SBOM
        if: steps.set-target.outputs.image_name != ''
        uses: anchore/sbom-action@e22c389904149dbc22b58101806040fa8d37a610 # v0.24.0
        id: sbom
        with:
          image: ${{ steps.set-target.outputs.image_name }}
          format: cyclonedx-json
          output-file: sbom.cyclonedx.json

      - name: Count SBOM components
        if: steps.set-target.outputs.image_name != ''
        id: sbom-count
        run: |
          COMPONENT_COUNT=$(jq '.components | length' sbom.cyclonedx.json 2>/dev/null || echo "0")
          echo "component_count=${COMPONENT_COUNT}" >> "$GITHUB_OUTPUT"
          echo "✅ SBOM generated with ${COMPONENT_COUNT} components"

      # Scan for vulnerabilities using manual Grype installation (pinned to v0.110.0)
      - name: Install Grype
        if: steps.set-target.outputs.image_name != ''
        run: |
          curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin v0.111.0

      - name: Scan for vulnerabilities
        if: steps.set-target.outputs.image_name != ''
        id: grype-scan
        run: |
          echo "🔍 Scanning SBOM for vulnerabilities..."
          grype sbom:sbom.cyclonedx.json --config .grype.yaml -o json > grype-results.json
          grype sbom:sbom.cyclonedx.json --config .grype.yaml -o sarif > grype-results.sarif

      - name: Debug Output Files
        if: steps.set-target.outputs.image_name != ''
        run: |
            echo "📂 Listing workspace files:"
            ls -la

      - name: Process vulnerability results
        if: steps.set-target.outputs.image_name != ''
        id: vuln-summary
        run: |
          # Verify scan actually produced output
          if [[ ! -f "grype-results.json" ]]; then
             echo "❌ Error: grype-results.json not found!"
             echo "Available files:"
             ls -la
             exit 1
          fi

          # Debug content (head)
          echo "📄 Grype JSON Preview:"
          head -n 20 grype-results.json

          # Count vulnerabilities by severity - strict failing if file is missing (already checked above)
          CRITICAL_COUNT=$(jq '[.matches[] | select(.vulnerability.severity == "Critical")] | length' grype-results.json 2>/dev/null || echo "0")
          HIGH_COUNT=$(jq '[.matches[] | select(.vulnerability.severity == "High")] | length' grype-results.json 2>/dev/null || echo "0")
          MEDIUM_COUNT=$(jq '[.matches[] | select(.vulnerability.severity == "Medium")] | length' grype-results.json 2>/dev/null || echo "0")
          LOW_COUNT=$(jq '[.matches[] | select(.vulnerability.severity == "Low")] | length' grype-results.json 2>/dev/null || echo "0")
          TOTAL_COUNT=$(jq '.matches | length' grype-results.json 2>/dev/null || echo "0")

          {
            echo "critical_count=${CRITICAL_COUNT}"
            echo "high_count=${HIGH_COUNT}"
            echo "medium_count=${MEDIUM_COUNT}"
            echo "low_count=${LOW_COUNT}"
            echo "total_count=${TOTAL_COUNT}"
          } >> "$GITHUB_OUTPUT"

          echo "📊 Vulnerability Summary:"
          echo "  Critical: ${CRITICAL_COUNT}"
          echo "  High: ${HIGH_COUNT}"
          echo "  Medium: ${MEDIUM_COUNT}"
          echo "  Low: ${LOW_COUNT}"
          echo "  Total: ${TOTAL_COUNT}"

      - name: Security severity policy summary
        if: steps.set-target.outputs.image_name != ''
        run: |
          CRITICAL_COUNT="${{ steps.vuln-summary.outputs.critical_count }}"
          HIGH_COUNT="${{ steps.vuln-summary.outputs.high_count }}"
          MEDIUM_COUNT="${{ steps.vuln-summary.outputs.medium_count }}"

          {
            echo "## 🔐 Supply Chain Severity Policy"
            echo ""
            echo "- Blocking: Critical, High"
            echo "- Medium: non-blocking by default (report + triage SLA)"
            echo "- Policy file: .github/security-severity-policy.yml"
            echo ""
            echo "Current scan counts: Critical=${CRITICAL_COUNT}, High=${HIGH_COUNT}, Medium=${MEDIUM_COUNT}"
          } >> "$GITHUB_STEP_SUMMARY"

          if [[ "${MEDIUM_COUNT}" -gt 0 ]]; then
            echo "::warning::${MEDIUM_COUNT} medium vulnerabilities found. Non-blocking by policy; create/maintain triage issue with SLA per .github/security-severity-policy.yml"
          fi

      - name: Upload SARIF to GitHub Security
        if: steps.check-artifact.outputs.artifact_found == 'true'
        uses: github/codeql-action/upload-sarif@95e58e9a2cdfd71adc6e0353d5c52f41a045d225 # v4
        continue-on-error: true
        with:
          sarif_file: grype-results.sarif
          category: supply-chain-pr

      - name: Upload supply chain artifacts
        if: steps.set-target.outputs.image_name != ''
        # actions/upload-artifact v4.6.0
        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f
        with:
          name: ${{ steps.pr-number.outputs.is_push == 'true' && format('supply-chain-{0}', steps.sanitize.outputs.branch) || format('supply-chain-pr-{0}', steps.pr-number.outputs.pr_number) }}
          path: |
            sbom.cyclonedx.json
            grype-results.json
          retention-days: 14

      - name: Comment on PR
        if: steps.set-target.outputs.image_name != '' && steps.pr-number.outputs.is_push != 'true' && steps.pr-number.outputs.pr_number != ''
        continue-on-error: true
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail

          PR_NUMBER="${{ steps.pr-number.outputs.pr_number }}"
          COMPONENT_COUNT="${{ steps.sbom-count.outputs.component_count }}"
          CRITICAL_COUNT="${{ steps.vuln-summary.outputs.critical_count }}"
          HIGH_COUNT="${{ steps.vuln-summary.outputs.high_count }}"
          MEDIUM_COUNT="${{ steps.vuln-summary.outputs.medium_count }}"
          LOW_COUNT="${{ steps.vuln-summary.outputs.low_count }}"
          TOTAL_COUNT="${{ steps.vuln-summary.outputs.total_count }}"

          # Determine status emoji
          if [[ "${CRITICAL_COUNT}" -gt 0 ]]; then
            STATUS="❌ **FAILED**"
            STATUS_EMOJI="🚨"
          elif [[ "${HIGH_COUNT}" -gt 0 ]]; then
            STATUS="⚠️ **WARNING**"
            STATUS_EMOJI="⚠️"
          else
            STATUS="✅ **PASSED**"
            STATUS_EMOJI="✅"
          fi

          COMMENT_BODY=$(cat <<EOF
          ## ${STATUS_EMOJI} Supply Chain Verification Results

          ${STATUS}

          ### 📦 SBOM Summary
          - **Components**: ${COMPONENT_COUNT}

          ### 🔍 Vulnerability Scan
          | Severity | Count |
          |----------|-------|
          | 🔴 Critical | ${CRITICAL_COUNT} |
          | 🟠 High | ${HIGH_COUNT} |
          | 🟡 Medium | ${MEDIUM_COUNT} |
          | 🟢 Low | ${LOW_COUNT} |
          | **Total** | **${TOTAL_COUNT}** |

          ### 📎 Artifacts
          - SBOM (CycloneDX JSON) and Grype results available in workflow artifacts

          ---
          <sub>Generated by Supply Chain Verification workflow • [View Details](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})</sub>
          EOF
          )

          # Fetch existing comments — skip gracefully on 403 / permission errors
          COMMENTS_JSON=""
          if ! COMMENTS_JSON=$(gh api \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            "/repos/${{ github.repository }}/issues/${PR_NUMBER}/comments" 2>/dev/null); then
            echo "⚠️ Cannot access PR comments (likely token permissions / fork / event context). Skipping PR comment."
            exit 0
          fi

          COMMENT_ID=$(echo "${COMMENTS_JSON}" | jq -r '.[] | select(.body | contains("Supply Chain Verification Results")) | .id' | head -1)

          if [[ -n "${COMMENT_ID:-}" && "${COMMENT_ID}" != "null" ]]; then
            echo "📝 Updating existing comment..."
            if ! gh api --method PATCH \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${{ github.repository }}/issues/comments/${COMMENT_ID}" \
              -f body="${COMMENT_BODY}"; then
              echo "⚠️ Failed to update comment (permissions?). Skipping."
              exit 0
            fi
          else
            echo "📝 Creating new comment..."
            if ! gh api --method POST \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${{ github.repository }}/issues/${PR_NUMBER}/comments" \
              -f body="${COMMENT_BODY}"; then
              echo "⚠️ Failed to create comment (permissions?). Skipping."
              exit 0
            fi
          fi

          echo "✅ PR comment posted"

      - name: Fail on Critical/High vulnerabilities
        if: steps.set-target.outputs.image_name != ''
        run: |
          CRITICAL_COUNT="${{ steps.vuln-summary.outputs.critical_count }}"
          HIGH_COUNT="${{ steps.vuln-summary.outputs.high_count }}"

          if [[ "${CRITICAL_COUNT}" -gt 0 ]]; then
            echo "🚨 Found ${CRITICAL_COUNT} CRITICAL vulnerabilities!"
            echo "Please review the vulnerability report and address critical issues before merging."
            exit 1
          fi

          if [[ "${HIGH_COUNT}" -gt 0 ]]; then
            echo "🚨 Found ${HIGH_COUNT} HIGH vulnerabilities!"
            echo "Please review the vulnerability report and address high severity issues before merging."
            exit 1
          fi

          echo "✅ No Critical/High vulnerabilities found"