name: Comment on PRs in Release

on:
  release:
    types: [published]

permissions:
  pull-requests: write
  contents: read

jobs:
  comment-on-prs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          fetch-depth: 0

      - name: Get previous release
        id: previous_release
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
        with:
          script: |
            const currentTag = '${{ github.event.release.tag_name }}';

            // Get all releases
            const { data: releases } = await github.rest.repos.listReleases({
              owner: context.repo.owner,
              repo: context.repo.repo,
              per_page: 100
            });

            // Find current release index
            const currentIndex = releases.findIndex(r => r.tag_name === currentTag);

            if (currentIndex === -1) {
              console.log('Current release not found in list');
              return null;
            }

            // Get previous release (next in the list since they're sorted by date desc)
            const previousRelease = releases[currentIndex + 1];

            if (!previousRelease) {
              console.log('No previous release found, this might be the first release');
              return null;
            }

            console.log(`Found previous release: ${previousRelease.tag_name}`);

            return previousRelease.tag_name;

      - name: Get merged PRs between releases
        id: get_prs
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
        with:
          script: |
            const currentTag = '${{ github.event.release.tag_name }}';
            const previousTag = ${{ steps.previous_release.outputs.result }};

            if (!previousTag) {
              console.log('No previous release found, skipping');
              return [];
            }

            console.log(`Finding PRs between ${previousTag} and ${currentTag}`);

            // Get commits between previous and current release
            const comparison = await github.rest.repos.compareCommits({
              owner: context.repo.owner,
              repo: context.repo.repo,
              base: previousTag,
              head: currentTag
            });

            const commits = comparison.data.commits;
            console.log(`Found ${commits.length} commits`);

            // Get PRs associated with each commit using GitHub API
            const prNumbers = new Set();

            for (const commit of commits) {
              try {
                const { data: prs } = await github.rest.repos.listPullRequestsAssociatedWithCommit({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  commit_sha: commit.sha
                });

                for (const pr of prs) {
                  if (pr.merged_at) {
                    prNumbers.add(pr.number);
                    console.log(`Found merged PR: #${pr.number}`);
                  }
                }
              } catch (error) {
                console.log(`Failed to get PRs for commit ${commit.sha}: ${error.message}`);
              }
            }

            console.log(`Found ${prNumbers.size} merged PRs`);
            return Array.from(prNumbers);

      - name: Comment on PRs
        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
        with:
          script: |
            const prNumbers = ${{ steps.get_prs.outputs.result }};
            const releaseTag = '${{ github.event.release.tag_name }}';
            const releaseUrl = '${{ github.event.release.html_url }}';

            const comment = `This pull request is included in [${releaseTag}](${releaseUrl})`;

            let commentedCount = 0;

            for (const prNumber of prNumbers) {
              try {
                // Check if we've already commented on this PR for this release
                const { data: comments } = await 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(releaseTag)
                );

                if (alreadyCommented) {
                  console.log(`Skipping PR #${prNumber} - already commented for ${releaseTag}`);
                  continue;
                }

                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: prNumber,
                  body: comment
                });
                commentedCount++;
                console.log(`Successfully commented on PR #${prNumber}`);
              } catch (error) {
                console.error(`Failed to comment on PR #${prNumber}:`, error.message);
              }
            }

            console.log(`Commented on ${commentedCount} of ${prNumbers.length} PRs`);