name: code-format-msg

on:
  workflow_run:
    workflows: [code-format]
    types: [completed]

concurrency:
  group: code-format-msg-${{ github.head_ref || github.run_id }}

permissions:
  contents: read
  pull-requests: write

jobs:
  pr-context:
    name: acquire-pr-context
    runs-on: ubuntu-latest
    outputs:
      PR_HEADSHA: ${{ steps.set-pr-context.outputs.head-sha }}
      PR_NUMBER:  ${{ steps.set-pr-context.outputs.number   }}
    if: ${{ github.event.workflow_run.event == 'pull_request' }}
    steps:
    - name: get-pr-context
      id: set-pr-context
      env:
        GH_TOKEN: ${{ github.token }}
        PR_TARGET_REPO: ${{ github.repository }}
        PR_BRANCH: |-
          ${{
            (github.event.workflow_run.head_repository.owner.login != github.event.workflow_run.repository.owner.login)
              && format('{0}:{1}', github.event.workflow_run.head_repository.owner.login, github.event.workflow_run.head_branch)
              || github.event.workflow_run.head_branch
          }}
      run: |
        gh pr view --repo "${PR_TARGET_REPO}" "${PR_BRANCH}" \
          --json 'number,headRefOid' \
          --jq '"number=\(.number)\nhead-sha=\(.headRefOid)"' \
          >> $GITHUB_OUTPUT

  remove-comment-if-success:
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    runs-on: ubuntu-latest
    needs: [pr-context]
    env:
      PR_HEADSHA: ${{ needs.pr-context.outputs.PR_HEADSHA }}
      PR_NUMBER:  ${{ needs.pr-context.outputs.PR_NUMBER  }}
    steps:
    - name: Remove existing "format check failed" comment
      uses: actions/github-script@v7
      with:
        script: |
          const owner = context.repo.owner;
          const repo = context.repo.repo;
          const { data: comments } = await github.rest.issues.listComments({
            owner,
            repo,
            issue_number: ${{ env.PR_NUMBER }},
          });

          const targetComment = comments.find(comment =>
            comment.body.includes("Please enable github action in **YOUR FORKED REPO** to make code-format workflow work")
          );

          if (targetComment) {
            await github.rest.issues.deleteComment({
              owner,
              repo,
              comment_id: targetComment.id,
            });
            console.log("Removed existing code-format failure comment.");
          } else {
            console.log("No existing format failure comment to remove.");
          }

  post-comment-if-failure:
    if: ${{ github.event.workflow_run.conclusion == 'failure' }}
    runs-on: ubuntu-latest
    needs: [pr-context]
    env:
      PR_HEADSHA: ${{ needs.pr-context.outputs.PR_HEADSHA }}
      PR_NUMBER:  ${{ needs.pr-context.outputs.PR_NUMBER  }}
    steps:
    - name: Post comment on failed code-format if not existing
      uses: actions/github-script@v7
      with:
        script: |
          const owner = context.repo.owner;
          const repo = context.repo.repo;
          const { data: comments } = await github.rest.issues.listComments({
            owner,
            repo,
            issue_number: ${{ env.PR_NUMBER }},
          });

          const existingComment = comments.find(comment =>
            comment.body.includes("Please enable github action in **YOUR FORKED REPO** to make code-format workflow work")
          );

          if (existingComment) {
            console.log("A code-format failure comment already exists.");
          } else {
            await github.rest.issues.createComment({
              owner,
              repo,
              issue_number: ${{ env.PR_NUMBER }},
              body: "Please enable github action in **YOUR FORKED REPO** to make code-format workflow work",
            });
            console.log("Created code-format failure comment.");
          }