name: Bounty detector

on:
  issues:
    types: [labeled]

permissions:
  issues: write
  pull-requests: read

jobs:
  notify:
    runs-on: ubuntu-latest
    if: startsWith(github.event.label.name, 'diff:')
    steps:
      - name: Comment bounty info
        uses: actions/github-script@v7
        env:
          FORUM_URL: "https://hub.jmonkeyengine.org/t/bounty-program-trial-starts-today/49394/"
          RESERVE_HOURS: "48"
          TIMER_SVG_BASE: "https://jme-bounty-reservation-indicator.rblb.workers.dev/timer.svg"
        with:
          script: |
            const issue = context.payload.issue;
            const actor = context.actor;
            const issueOwner = issue.user?.login;
            if (!issueOwner) return;

            const forumUrl = process.env.FORUM_URL || "TBD";
            const reserveHours = Number(process.env.RESERVE_HOURS || "48");
            const svgBase = process.env.TIMER_SVG_BASE || "";

            // "previous contributor" = has at least one merged PR authored in this repo
            const repoFull = `${context.repo.owner}/${context.repo.repo}`;
            const q = `repo:${repoFull} type:pr author:${issueOwner} is:merged`;

            let isPreviousContributor = false;
            try {
              const search = await github.rest.search.issuesAndPullRequests({ q, per_page: 1 });
              isPreviousContributor = (search.data.total_count ?? 0) > 0;
            } catch (e) {
              isPreviousContributor = false;
            }

            // Reserve only if previous contributor AND labeler is NOT the issue owner
            const shouldReserve = isPreviousContributor && (actor !== issueOwner);

            const lines = [];
            lines.push(`## 💰 This issue has a bounty`);
            lines.push(`Resolve it to receive a reward.`);
            lines.push(`For details (amount, rules, eligibility), see: ${forumUrl}`);
            lines.push("");

            lines.push(`If you want to start working on this, **comment on this issue** with your intent.`);
            lines.push(`If accepted by a maintainer, the issue will be **assigned** to you.`);
            lines.push("");

            if (shouldReserve && svgBase) {
              const reservedUntil = new Date(Date.now() + reserveHours * 60 * 60 * 1000);
              const reservedUntilIso = reservedUntil.toISOString();

              const svgUrl =
                `${svgBase}` +
                `?until=${encodeURIComponent(reservedUntilIso)}` +
                `&user=${encodeURIComponent(issueOwner)}` +
                `&theme=dark`;

              lines.push(`![bounty reservation](${svgUrl})`);
              lines.push("");
            }

            // Avoid duplicate comments for the same label
            const comments = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue.number,
              per_page: 100,
            });

            const already = comments.data.some(c =>
              c.user?.login === "github-actions[bot]" &&
              typeof c.body === "string" &&
              c.body.includes("This issue has a bounty")
            );

            if (already) return;

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue.number,
              body: lines.join("\n"),
            });