name: PR comment (mypy_primer)

on: # zizmor: ignore[dangerous-triggers]
  workflow_run:
    workflows: [Run mypy_primer]
    types: [completed]
  workflow_dispatch:
    inputs:
      workflow_run_id:
        description: The mypy_primer workflow that triggers the workflow run
        required: true

jobs:
  comment:
    runs-on: ubuntu-24.04
    permissions:
      pull-requests: write
    steps:
      - uses: dawidd6/action-download-artifact@20319c5641d495c8a52e688b7dc5fada6c3a9fbc # v8
        name: Download PR number
        with:
          name: pr-number
          run_id: ${{ github.event.workflow_run.id ||  github.event.inputs.workflow_run_id }}
          if_no_artifact_found: ignore
          allow_forks: true

      - name: Parse pull request number
        id: pr-number
        run: |
          if [[ -f pr-number ]]
          then
            echo "pr-number=$(<pr-number)" >> "$GITHUB_OUTPUT"
          fi

      - uses: dawidd6/action-download-artifact@20319c5641d495c8a52e688b7dc5fada6c3a9fbc # v8
        name: "Download mypy_primer results"
        id: download-mypy_primer_diff
        if: steps.pr-number.outputs.pr-number
        with:
          name: mypy_primer_diff
          workflow: mypy_primer.yaml
          pr: ${{ steps.pr-number.outputs.pr-number }}
          path: pr/mypy_primer_diff
          workflow_conclusion: completed
          if_no_artifact_found: ignore
          allow_forks: true

      - uses: dawidd6/action-download-artifact@20319c5641d495c8a52e688b7dc5fada6c3a9fbc # v8
        name: "Download mypy_primer memory results"
        id: download-mypy_primer_memory_diff
        if: steps.pr-number.outputs.pr-number
        with:
          name: mypy_primer_memory_diff
          workflow: mypy_primer.yaml
          pr: ${{ steps.pr-number.outputs.pr-number }}
          path: pr/mypy_primer_memory_diff
          workflow_conclusion: completed
          if_no_artifact_found: ignore
          allow_forks: true

      - name: Generate comment content
        id: generate-comment
        if: ${{ steps.download-mypy_primer_diff.outputs.found_artifact == 'true' && steps.download-mypy_primer_memory_diff.outputs.found_artifact == 'true' }}
        run: |
          # Guard against malicious mypy_primer results that symlink to a secret
          # file on this runner
          if [[ -L pr/mypy_primer_diff/mypy_primer.diff ]] || [[ -L pr/mypy_primer_memory_diff/mypy_primer_memory.diff ]]
          then
              echo "Error: mypy_primer.diff and mypy_primer_memory.diff cannot be a symlink"
              exit 1
          fi

          # Note this identifier is used to find the comment to update on
          # subsequent runs
          echo '<!-- generated-comment mypy_primer -->' >> comment.txt

          echo '## `mypy_primer` results' >> comment.txt
          if [ -s "pr/mypy_primer_diff/mypy_primer.diff" ]; then
            echo '<details>' >> comment.txt
            echo '<summary>Changes were detected when running on open source projects</summary>' >> comment.txt
            echo '' >> comment.txt
            echo '```diff' >> comment.txt
            cat pr/mypy_primer_diff/mypy_primer.diff >> comment.txt
            echo '```' >> comment.txt
            echo '</details>' >> comment.txt
          else
            echo 'No ecosystem changes detected ✅' >> comment.txt
          fi

          if [ -s "pr/mypy_primer_memory_diff/mypy_primer_memory.diff" ]; then
            echo '<details>' >> comment.txt
            echo '<summary>Memory usage changes were detected when running on open source projects</summary>' >> comment.txt
            echo '' >> comment.txt
            echo '```diff' >> comment.txt
            cat pr/mypy_primer_memory_diff/mypy_primer_memory.diff >> comment.txt
            echo '```' >> comment.txt
            echo '</details>' >> comment.txt
          else
            echo 'No memory usage changes detected ✅' >> comment.txt
          fi

          echo 'comment<<EOF' >> "$GITHUB_OUTPUT"
          cat comment.txt >> "$GITHUB_OUTPUT"
          echo 'EOF' >> "$GITHUB_OUTPUT"

      - name: Find existing comment
        uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3.1.0
        if: steps.generate-comment.outcome == 'success'
        id: find-comment
        with:
          issue-number: ${{ steps.pr-number.outputs.pr-number }}
          comment-author: "github-actions[bot]"
          body-includes: "<!-- generated-comment mypy_primer -->"

      - name: Create or update comment
        if: steps.find-comment.outcome == 'success'
        uses: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043 # v4
        with:
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          issue-number: ${{ steps.pr-number.outputs.pr-number }}
          body-path: comment.txt
          edit-mode: replace
