name: Post Web Flasher Link Comment

on:
  workflow_run:
    workflows: [CI]
    types: [completed]

permissions:
  pull-requests: write
  actions: read

jobs:
  post-flasher-link:
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success' &&
      github.repository == 'meshtastic/firmware'
    continue-on-error: true
    runs-on: ubuntu-latest
    steps:
      - name: Post or update web flasher link comment
        uses: actions/github-script@v8
        with:
          script: |
            const marker = '<!-- web-flasher-link -->';
            const run = context.payload.workflow_run;
            const { owner, repo } = context.repo;

            // Resolve the PR number (run.pull_requests is empty for fork PRs)
            let prNumber = run.pull_requests?.[0]?.number;
            if (!prNumber) {
              const { data: prs } = await github.rest.repos.listPullRequestsAssociatedWithCommit({
                owner, repo, commit_sha: run.head_sha,
              });
              prNumber = (prs.find((pr) => pr.head.sha === run.head_sha) ?? prs[0])?.number;
            }
            if (!prNumber) {
              core.info('No pull request associated with this run; skipping.');
              return;
            }

            const { data: pr } = await github.rest.pulls.get({ owner, repo, pull_number: prNumber });

            // Only comment on PRs from contributors and members
            const allowedAssociations = ['OWNER', 'MEMBER', 'COLLABORATOR', 'CONTRIBUTOR'];
            if (!allowedAssociations.includes(pr.author_association)) {
              core.info(`Author association ${pr.author_association} is not eligible; skipping.`);
              return;
            }
            if (pr.state !== 'open') {
              core.info('Pull request is not open; skipping.');
              return;
            }
            if (pr.head.sha !== run.head_sha) {
              core.info('Run is for an outdated commit; skipping.');
              return;
            }

            // Require at least one per-arch firmware artifact from gather-artifacts
            const artifacts = await github.paginate(github.rest.actions.listWorkflowRunArtifacts, {
              owner, repo, run_id: run.id, per_page: 100,
            });
            const archRe = /^firmware-(esp32|esp32s3|esp32c3|esp32c6|nrf52840|rp2040|rp2350|stm32)-(\d+\.\d+\.\d+\.[0-9a-f]+)$/;
            const archArtifacts = artifacts.filter((a) => archRe.test(a.name) && !a.expired);
            if (archArtifacts.length === 0) {
              core.info('No per-arch firmware artifacts found; skipping.');
              return;
            }

            const version = archRe.exec(archArtifacts[0].name)[2];
            const expiresAt = archArtifacts[0].expires_at
              ? new Date(archArtifacts[0].expires_at).toISOString().slice(0, 10)
              : null;

            // Per-board deep links from manifest-{platform}-{board}-{version} artifacts
            const escapedVersion = version.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
            const boardRe = new RegExp(`^manifest-([a-z0-9]+)-(.+)-${escapedVersion}$`);
            const boards = artifacts
              .map((a) => boardRe.exec(a.name))
              .filter(Boolean)
              .map((m) => ({ platform: m[1], board: m[2] }))
              .sort((a, b) => a.board.localeCompare(b.board));

            const flasherUrl = `https://flasher.meshtastic.org/?pr=${prNumber}`;
            const boardLines = boards
              .map((b) => `| [\`${b.board}\`](${flasherUrl}&device=${encodeURIComponent(b.board)}) | ${b.platform} |`)
              .join('\n');

            const body = [
              marker,
              '## 🔦 Try this PR in the Web Flasher',
              '',
              `[**Flash firmware \`${version}\`** (commit \`${run.head_sha.slice(0, 7)}\`)](${flasherUrl})`,
              '',
              '> [!WARNING]',
              '> This is an automated, unreviewed CI test build. Back up your device configuration',
              '> before flashing, and only flash devices you are able to recover.',
              '',
              `<details><summary>Boards built by this PR (${boards.length})</summary>`,
              '',
              '| Board | Platform |',
              '| --- | --- |',
              boardLines,
              '',
              '</details>',
              '',
              `*Build artifacts expire${expiresAt ? ` on ${expiresAt}` : ' after 30 days'}. Updated for ${run.head_sha}.*`,
            ].join('\n');

            // Sticky comment: update in place when the marker is found
            const comments = await github.paginate(github.rest.issues.listComments, {
              owner, repo, issue_number: prNumber, per_page: 100,
            });
            const existing = comments.find((c) => c.body?.includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({ owner, repo, comment_id: existing.id, body });
            } else {
              await github.rest.issues.createComment({ owner, repo, issue_number: prNumber, body });
            }