name: Comment on Linked Issues

on:
  workflow_run:
    workflows: ["Nightly Workflow"]
    types: [completed]
    branches: [develop]
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'PR number to process'
        required: true
        type: number
      stable_version:
        description: 'Override stable version (e.g., 0.8.5)'
        required: false
        type: string

jobs:
  comment-issues:
    name: Comment on Linked Issues
    runs-on: ubuntu-24.04
    if: >
      (github.event_name == 'workflow_dispatch') ||
      (github.event.workflow_run.conclusion == 'success')
    steps:
      - name: Checkout Repo
        uses: actions/checkout@v4
        with:
          ref: develop
          fetch-depth: 0

      - name: Get csproj Version
        uses: kzrnm/get-net-sdk-project-versions-action@v2
        id: get-version
        with:
          proj-path: Kavita.Common/Kavita.Common.csproj

      - name: Calculate Versions
        id: versions
        run: |
          nightly='${{ steps.get-version.outputs.assembly-version }}'
          IFS='.' read -r major minor patch build <<< "$nightly"
          default_stable="$major.$minor.$((patch + 1))"

          stable_override='${{ inputs.stable_version }}'
          if [ -n "$stable_override" ]; then
            stable_version="$stable_override"
          else
            stable_version="$default_stable"
          fi

          echo "NIGHTLY_VERSION=$nightly" >> $GITHUB_OUTPUT
          echo "STABLE_VERSION=$stable_version" >> $GITHUB_OUTPUT

      - name: Find PR from Commit
        id: pr-number
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            if ('${{ github.event_name }}' === 'workflow_dispatch') {
              core.setOutput('pr', '${{ inputs.pr_number }}');
              return;
            }

            const sha = '${{ github.event.workflow_run.head_sha }}';
            const { data: prs } = await github.rest.repos.listPullRequestsAssociatedWithCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              commit_sha: sha
            });

            const merged = prs.find(pr => pr.merged_at !== null);
            if (merged) {
              console.log(`Found merged PR #${merged.number}`);
              core.setOutput('pr', merged.number);
            } else {
              console.log('No merged PR found for commit');
              core.setOutput('pr', '');
            }

      - name: Comment on Linked Issues
        if: steps.pr-number.outputs.pr != ''
        uses: actions/github-script@v7
        env:
          NIGHTLY_VERSION: ${{ steps.versions.outputs.NIGHTLY_VERSION }}
          STABLE_VERSION: ${{ steps.versions.outputs.STABLE_VERSION }}
          PR_NUMBER: ${{ steps.pr-number.outputs.pr }}
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const prNumber = parseInt(process.env.PR_NUMBER);
            const nightlyVersion = process.env.NIGHTLY_VERSION;
            const stableVersion = process.env.STABLE_VERSION;

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

            const textToSearch = `${pr.title || ''}\n${pr.body || ''}`;
            const linkedIssues = new Map();

            // Match: Fixes #123, Closes #123, Resolves #123 (and variants)
            const pattern = /(?:close[sd]?|fix(?:e[sd])?|resolve[sd]?)\s+#(\d+)/gi;
            let match;
            while ((match = pattern.exec(textToSearch)) !== null) {
              const num = parseInt(match[1]);
              linkedIssues.set(num, { owner: context.repo.owner, repo: context.repo.repo, number: num });
            }

            if (linkedIssues.size === 0) {
              console.log('No linked issues found');
              return;
            }

            console.log(`Found ${linkedIssues.size} linked issues: ${[...linkedIssues.keys()].join(', ')}`);

            const commentBody = `This was closed as of PR #${prNumber}, it is available in v${nightlyVersion} (nightly) and will be available in v${stableVersion} (stable).`;

            let posted = 0, skipped = 0, failed = 0;

            for (const [num, issue] of linkedIssues) {
              try {
                const { data: issueData } = await github.rest.issues.get({
                  owner: issue.owner,
                  repo: issue.repo,
                  issue_number: issue.number
                });

                if (issueData.pull_request) {
                  console.log(`#${num}: skipped (pull request)`);
                  skipped++;
                  continue;
                }

                const { data: comments } = await github.rest.issues.listComments({
                  owner: issue.owner,
                  repo: issue.repo,
                  issue_number: issue.number,
                  per_page: 100
                });

                const alreadyCommented = comments.some(c =>
                  c.user?.login === 'github-actions[bot]' &&
                  c.body?.includes(`PR #${prNumber}`)
                );

                if (alreadyCommented) {
                  console.log(`#${num}: skipped (already commented)`);
                  skipped++;
                  continue;
                }

                await github.rest.issues.createComment({
                  owner: issue.owner,
                  repo: issue.repo,
                  issue_number: issue.number,
                  body: commentBody
                });

                console.log(`#${num}: commented`);
                posted++;

              } catch (error) {
                console.log(`#${num}: failed (${error.message})`);
                failed++;
              }
            }

            console.log(`Summary: ${posted} posted, ${skipped} skipped, ${failed} failed`);