name: AgentScan

on:
  # jobs only use pinned actions and never checkout code
  pull_request_target: # zizmor: ignore[dangerous-triggers]
    types: [opened, reopened, synchronize, edited]

concurrency:
  group: agent-scan-${{ github.event.pull_request.number }}
  cancel-in-progress: true

permissions:
  issues: write
  pull-requests: write

jobs:
  agentscan:
    runs-on: ubuntu-latest
    steps:
      - name: AgentScan
        id: agentscan
        uses: MatteoGabriele/agentscan-action@0a0c88109b5153dff2805f969f5060441efb7b65
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          skip-members: "dependabot[bot],renovate[bot], giteabot (backports)"
          agent-scan-comment: false

      - name: Handle flagged PR
        if: contains(fromJSON('["automation","mixed"]'), steps.agentscan.outputs.classification) || steps.agentscan.outputs.community-flagged == 'true'
        env:
          CLASSIFICATION: ${{ steps.agentscan.outputs.classification }}
          COMMUNITY_FLAGGED: ${{ steps.agentscan.outputs.community-flagged }}
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3
        with:
          script: |
            const core = require('@actions/core');
            const prNumber = context.payload.pull_request.number;
            const classification = process.env.CLASSIFICATION;
            const communityFlagged = process.env.COMMUNITY_FLAGGED === 'true';
            const shouldClose = classification === 'automation' || communityFlagged;

            const issue = context.payload.pull_request;
            const labels = issue.labels?.map(l => l.name) || [];

            if (!labels.includes('possible bot')) {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                labels: ['possible bot'],
              });
            }

            const comments = await github.paginate(github.rest.issues.listComments, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              per_page: 100,
            });

            const alreadyCommented = comments.some(c => c.user.type === 'Bot' && c.body.includes('AI Contribution Policy'));

            if (!alreadyCommented) {
              const closingNote = shouldClose
                ? "We're closing this for now as the account looks automated. If we got that wrong, please just reopen the PR and we'll take another look."
                : 'If this was flagged in error, we apologise! 😳 Just let us know. 🙏';

              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                body: [
                  "We've flagged this pull request as potentially AI-assisted.",
                  '',
                  'Gitea welcomes the thoughtful use of AI tools, but contributors must use them responsibly and clearly disclose any assistance. Please follow the AI Contribution Policy in `CONTRIBUTING.md` and update this PR accordingly:',
                  '',
                  'Maintainers may close PRs that do not disclose AI assistance, appear to be low-quality AI-generated content, or where the contributor cannot explain the changes.',
                  '',
                  'See: https://github.com/go-gitea/gitea/blob/main/CONTRIBUTING.md#ai-contribution-policy',
                  '',
                  closingNote,
                ].join('\n'),
              });
            } else {
              core.info('Possible-bot comment already exists - skipping comment.');
            }

            if (shouldClose && issue.state === 'open' && !alreadyCommented) {
              await github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: prNumber,
                state: 'closed',
                title: '🚨 unwelcome pr from bot 🚨',
              });
            }

            const actionTaken = [
              'Added `possible bot` label',
              alreadyCommented ? null : 'posted policy comment',
              shouldClose && !alreadyCommented ? 'closed PR' : null,
            ].filter(Boolean).join(', ');

            core.summary
              .addHeading('AgentScan: Possible Bot Flag', 2)
              .addTable([
                [{ data: 'Property', header: true }, { data: 'Value', header: true }],
                ['Pull Request', `#${prNumber}`],
                ['Classification', classification],
                ['Community flagged', String(communityFlagged)],
                ['Action', actionTaken || 'No action (already handled)'],
              ])
              .write();