name: Issue Version Triage

on:
  issues:
    types:
      - opened
      - edited
      - reopened

permissions:
  contents: read
  issues: write

jobs:
  triage:
    if: ${{ github.event.issue.pull_request == null }}
    runs-on: ubuntu-latest
    steps:
      - name: Apply version labels and retest guidance
        uses: actions/github-script@v7
        with:
          script: |
            const issue = context.payload.issue;
            const labelNames = new Set((issue.labels || []).map((label) => label.name));

            // Restrict automation to bug reports only.
            if (!labelNames.has("bug")) {
              core.info("Issue is not labeled bug. Skipping version triage.");
              return;
            }

            const VERSION_LABEL_PREFIX = "affects-";
            const NEEDS_VERSION_LABEL = "needs-version-info";
            const RETEST_LABEL = "needs-retest-on-latest";
            const RETEST_COMMENT_MARKER = "<!-- issue-version-triage:v1 -->";

            function normalizeVersion(value) {
              if (!value) return null;
              const match = String(value).match(/\bv?(\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?)\b/);
              return match ? match[1] : null;
            }

            function extractPulseVersion(body) {
              if (!body) return null;

              const lines = body.split(/\r?\n/);
              for (let i = 0; i < lines.length; i += 1) {
                const line = lines[i] || "";
                if (/pulse\s*(\||-)?\s*version/i.test(line)) {
                  const inlineVersion = normalizeVersion(line);
                  if (inlineVersion) return inlineVersion;

                  // Check nearby lines because issue forms often put values on the next line.
                  for (let j = i + 1; j < Math.min(i + 6, lines.length); j += 1) {
                    const nearby = (lines[j] || "").trim();
                    if (!nearby) continue;
                    const nearbyVersion = normalizeVersion(nearby);
                    if (nearbyVersion) return nearbyVersion;
                  }
                }
              }

              // Fallback: issue-form block headed by "Pulse version".
              const headingMatch = body.match(/#+\s*Pulse version[\s\S]{0,80}?(\bv?\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?\b)/i);
              if (headingMatch) return normalizeVersion(headingMatch[1]);

              // Final fallback for older templates with "Pulse | Version: [5.1.2]".
              const legacyMatch = body.match(/pulse\s*\|?\s*version[^\n]*?(\bv?\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?\b)/i);
              if (legacyMatch) return normalizeVersion(legacyMatch[1]);

              return null;
            }

            function parseCore(version) {
              const match = String(version || "").match(/^(\d+)\.(\d+)\.(\d+)/);
              if (!match) return null;
              return [Number(match[1]), Number(match[2]), Number(match[3])];
            }

            function compareCore(a, b) {
              const av = parseCore(a);
              const bv = parseCore(b);
              if (!av || !bv) return null;
              for (let i = 0; i < 3; i += 1) {
                if (av[i] > bv[i]) return 1;
                if (av[i] < bv[i]) return -1;
              }
              return 0;
            }

            async function ensureLabel(name, color, description) {
              try {
                await github.rest.issues.getLabel({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  name,
                });
              } catch (error) {
                if (error.status !== 404) throw error;
                await github.rest.issues.createLabel({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  name,
                  color,
                  description,
                });
              }
            }

            async function hasRetestComment(issueNumber) {
              const comments = await github.paginate(github.rest.issues.listComments, {
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issueNumber,
                per_page: 100,
              });
              return comments.some((comment) => (comment.body || "").includes(RETEST_COMMENT_MARKER));
            }

            const reportedVersion = extractPulseVersion(issue.body);
            core.info(`Reported Pulse version: ${reportedVersion || "not found"}`);

            let latestVersion = null;
            try {
              const latest = await github.rest.repos.getLatestRelease({
                owner: context.repo.owner,
                repo: context.repo.repo,
              });
              latestVersion = normalizeVersion(latest.data.tag_name || latest.data.name || "");
            } catch (error) {
              core.warning(`Could not determine latest release: ${error.message}`);
            }
            core.info(`Latest stable release: ${latestVersion || "unknown"}`);

            const nextLabels = new Set(labelNames);

            if (reportedVersion) {
              await ensureLabel(
                `${VERSION_LABEL_PREFIX}${reportedVersion}`,
                "0e8a16",
                `Bug reported against Pulse ${reportedVersion}`
              );
              await ensureLabel(
                RETEST_LABEL,
                "d93f0b",
                "Reporter should retest on current latest stable release"
              );

              // Keep only one exact affects-X.Y.Z label for clarity.
              for (const label of [...nextLabels]) {
                if (/^affects-\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?$/.test(label) && label !== `${VERSION_LABEL_PREFIX}${reportedVersion}`) {
                  nextLabels.delete(label);
                }
              }

              nextLabels.add(`${VERSION_LABEL_PREFIX}${reportedVersion}`);
              nextLabels.delete(NEEDS_VERSION_LABEL);

              const comparison = latestVersion ? compareCore(reportedVersion, latestVersion) : null;
              if (comparison !== null && comparison < 0) {
                nextLabels.add(RETEST_LABEL);

                if (!(await hasRetestComment(issue.number))) {
                  const body = [
                    RETEST_COMMENT_MARKER,
                    "Thanks for the report.",
                    "",
                    `I can see this was reported on **v${reportedVersion}**, while the latest stable release is **v${latestVersion}**.`,
                    `Please retest on **v${latestVersion}** and comment with:`,
                    "",
                    "- whether the issue still reproduces",
                    "- updated logs/diagnostics",
                    "- exact running image tag or digest",
                    "",
                    "If there is no reporter follow-up after 7 days, this issue may be auto-closed until new confirmation is provided.",
                    "",
                    "If it still reproduces on the latest version, I will keep this open as an active regression.",
                  ].join("\n");

                  await github.rest.issues.createComment({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: issue.number,
                    body,
                  });
                }
              } else {
                nextLabels.delete(RETEST_LABEL);
              }
            } else {
              await ensureLabel(
                NEEDS_VERSION_LABEL,
                "fbca04",
                "Issue is missing required Pulse version metadata"
              );
              nextLabels.add(NEEDS_VERSION_LABEL);
              nextLabels.delete(RETEST_LABEL);
            }

            await github.rest.issues.setLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue.number,
              labels: [...nextLabels].sort(),
            });