pr-issue-sync.yml

- name: Sync Issue Metadata to PR
  uses: actions/github-script@v7
  env:
    RESULT_JSON: ${{ steps.extract-issues.outputs.result }}
  with:
    github-token: ${{ secrets.GITHUB_TOKEN }}
    script: |
      const core = require('@actions/core');

      // Safely parse JSON from previous step
      const raw = process.env.RESULT_JSON;
      console.log("Raw JSON output:", raw);

      let data;
      try {
        data = JSON.parse(raw);

        // Handle case where the JSON is double-stringified
        if (typeof data === "string") {
          data = JSON.parse(data);
        }
      } catch (err) {
        core.setFailed(`Invalid JSON from extract-issues: ${err.message}\nRaw: ${raw}`);
        return;
      }

      console.log("Parsed data:", data);

      const prNumber = data.pr;
      const issueNumbers = data.issues || [];

      if (!issueNumbers.length) {
        console.log("No linked issues found.");
        return;
      }

      for (const issueNumber of issueNumbers) {
        try {
          // Fetch issue
          const { data: issue } = await github.rest.issues.get({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: parseInt(issueNumber)
          });

          console.log(`Syncing metadata from Issue #${issueNumber} to PR #${prNumber}`);

          // --- Sync Labels ---
          const issueLabels = issue.labels.map(l => l.name);
          const { data: pr } = await github.rest.pulls.get({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: prNumber
          });
          const currentPRLabels = pr.labels.map(l => l.name);
          const combinedLabels = Array.from(new Set([...currentPRLabels, ...issueLabels]));

          await github.rest.issues.addLabels({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: prNumber,
            labels: combinedLabels
          });
          console.log(`Labels applied: ${combinedLabels.join(', ')}`);

          // --- Sync Milestone ---
          if (issue.milestone) {
            await github.rest.issues.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              milestone: issue.milestone.number
            });
            console.log(`Milestone synced: ${issue.milestone.title}`);
          }

          // --- Optional: Add a comment on PR ---
          await github.rest.issues.createComment({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: prNumber,
            body: `✅ Synchronized metadata from Issue #${issueNumber}:\nLabels: ${issueLabels.join(', ')}\nMilestone: ${issue.milestone ? issue.milestone.title : 'None'}`
          });

        } catch (error) {
          console.error(`Error syncing issue #${issueNumber} to PR #${prNumber}:`, error.message);
        }
      }