name: Format Command

on:
  issue_comment:
    types: [created]

jobs:
  format:
    name: Format
    if: >-
      github.event.issue.pull_request &&
      github.event.comment.body == '/format' &&
      (
        github.event.comment.author_association == 'MEMBER' ||
        github.event.comment.author_association == 'OWNER' ||
        github.event.comment.author_association == 'COLLABORATOR'
      )
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Generate token
        id: app-token
        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
        with:
          app-id: ${{ secrets.APP_ID }}
          private-key: ${{ secrets.APP_PRIVATE_KEY }}
          # Push the formatted commit (contents), comment on the PR
          # (pull-requests), and react to the triggering comment via the
          # issues/comments reactions API (issues). Nothing else.
          permission-contents: write
          permission-pull-requests: write
          permission-issues: write

      - name: Get PR details
        id: pr
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });
            const isFork = pr.data.head.repo.fork || pr.data.head.repo.full_name !== `${context.repo.owner}/${context.repo.repo}`;
            core.setOutput('ref', pr.data.head.ref);
            core.setOutput('sha', pr.data.head.sha);
            core.setOutput('is_fork', isFork.toString());
            core.setOutput('full_name', pr.data.head.repo.full_name);

      - name: React to comment
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            await github.rest.reactions.createForIssueComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: context.payload.comment.id,
              content: 'eyes',
            });

      - name: Checkout (same-repo)
        if: steps.pr.outputs.is_fork == 'false'
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          ref: ${{ steps.pr.outputs.ref }}
          token: ${{ steps.app-token.outputs.token }}
          # Intentional: the same-repo push step below pushes the
          # formatted changes back to the PR branch using this credential.
          persist-credentials: true

      - name: Checkout (fork)
        if: steps.pr.outputs.is_fork == 'true'
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          repository: ${{ steps.pr.outputs.full_name }}
          ref: ${{ steps.pr.outputs.sha }}
          persist-credentials: false

      - name: Setup Node
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: 22

      - name: Run formatter
        run: npx oxfmt --ignore-path .gitignore

      - name: Check for changes
        id: diff
        run: |
          git add -A
          if git diff --staged --quiet; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Commit and push (same-repo)
        if: steps.pr.outputs.is_fork == 'false' && steps.diff.outputs.changed == 'true'
        run: |
          git config user.name "emdashbot[bot]"
          git config user.email "emdashbot[bot]@users.noreply.github.com"
          git commit -m "style: format"
          git push

      - name: Commit and push (fork)
        if: steps.pr.outputs.is_fork == 'true' && steps.diff.outputs.changed == 'true'
        id: push-fork
        run: |
          git config user.name "emdashbot[bot]"
          git config user.email "emdashbot[bot]@users.noreply.github.com"
          git commit -m "style: format"
          export GIT_ASKPASS="$RUNNER_TEMP/git-askpass.sh"
          printf '#!/bin/sh\necho "%s"\n' "$APP_TOKEN" > "$GIT_ASKPASS"
          chmod +x "$GIT_ASKPASS"
          git remote add fork "https://x-access-token@github.com/$FULL_NAME.git"
          if git push fork "HEAD:$HEAD_REF"; then
            echo "push_failed=false" >> "$GITHUB_OUTPUT"
          else
            echo "push_failed=true" >> "$GITHUB_OUTPUT"
          fi
          rm -f "$GIT_ASKPASS"
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
          FULL_NAME: ${{ steps.pr.outputs.full_name }}
          HEAD_REF: ${{ steps.pr.outputs.ref }}

      - name: Comment on push failure
        if: steps.push-fork.outputs.push_failed == 'true'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `Could not push formatting changes to this fork. The contributor may have "Allow edits by maintainers" disabled.\n\nPlease run the formatter locally:\n\n\`\`\`\npnpm format\n\`\`\``,
            });

      - name: React to comment (result)
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          CHANGED: ${{ steps.diff.outputs.changed }}
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const changed = process.env.CHANGED === 'true';
            await github.rest.reactions.createForIssueComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: context.payload.comment.id,
              content: changed ? 'rocket' : '+1',
            });