#!/usr/bin/env node
/**
 * Publish Gatekeep summary + agreed inline comments.
 * Forge-agnostic (GitHub + Gitea) via fetch — no gh CLI required.
 */
import { readFileSync, writeFileSync } from "node:fs";

const mergedPath = process.argv[2];
const floorPath = process.argv[3];
const scanPath = process.argv[4];
const merged = JSON.parse(readFileSync(mergedPath, "utf8"));
const floor = JSON.parse(readFileSync(floorPath, "utf8"));
const scan = scanPath ? JSON.parse(readFileSync(scanPath, "utf8")) : { hits: [] };

const event = JSON.parse(readFileSync(process.env.GITHUB_EVENT_PATH, "utf8"));
const pr = event.pull_request;
const repo = process.env.GITHUB_REPOSITORY;
const [owner, name] = repo.split("/");
const token =
  process.env.GITHUB_TOKEN || process.env.GITEA_TOKEN || process.env.GH_TOKEN || "";
const marker = "<!-- gatekeep-review -->";
const checkName = "gatekeep / security";

const apiBase = (process.env.GITHUB_API_URL || "https://api.github.com").replace(/\/$/, "");
const gitea = !apiBase.includes("api.github.com");

const SEV_EMOJI = { Critical: "🔴", High: "🟠", Medium: "🟡", Low: "🟢" };

async function forgeApi(method, path, body) {
  const p = path.startsWith("/") ? path : `/${path}`;
  const url = `${apiBase}${p}`;
  const headers = {
    Accept: gitea ? "application/json" : "application/vnd.github+json",
    "User-Agent": "gatekeep-action",
    Authorization: gitea ? `token ${token}` : `Bearer ${token}`,
  };
  if (body !== undefined) headers["Content-Type"] = "application/json";
  const res = await fetch(url, {
    method,
    headers,
    body: body !== undefined ? JSON.stringify(body) : undefined,
  });
  const text = await res.text();
  if (!res.ok) {
    throw new Error(`${method} ${p} → HTTP ${res.status}: ${text.slice(0, 400)}`);
  }
  return text.trim() ? JSON.parse(text) : null;
}

function approvals(tier) {
  if (tier === "low")
    return "Looks low-risk — no human needed once Gatekeep + security are green (auto-merge only if the kill switch is on).";
  if (tier === "medium") return "Needs **1 human** look. Bot thumbs-up don't count as that look.";
  return "Needs **2 human** approvals. Bots never fill those seats.";
}

function loc(f) {
  return f.location || (f.path ? `${f.path}${f.line ? `:${f.line}` : ""}` : "(no location)");
}

function formatFindingBlock(f, { disputed = false } = {}) {
  const sev = f.severity || "Medium";
  const emoji = SEV_EMOJI[sev] || "⚪";
  const pre = f.tag === "Pre-existing" ? " · pre-existing" : "";
  const block = f.blocking ? " · blocking" : "";
  const dispute = disputed ? " · disputed (not inlined)" : "";
  const tagNote = f.tag && f.tag !== "Important" ? ` · ${f.tag}` : "";
  const why = f.why_it_matters || "Impact not spelled out — please clarify before dismissing.";
  const detail = (f.body || "").trim();
  const detailBit = detail && detail !== why ? `\n\n${detail}` : "";
  return (
    `#### ${emoji} ${sev}${pre}${block}${dispute}${tagNote}: ${f.title}\n` +
    `- **Where:** \`${loc(f)}\`\n` +
    `- **Why it matters:** ${why}` +
    detailBit +
    `\n- _Models:_ ${f.models.join(", ")}`
  );
}

function formatInline(f) {
  const sev = f.severity || "Medium";
  const emoji = SEV_EMOJI[sev] || "⚪";
  const pre = f.tag === "Pre-existing" ? " (pre-existing)" : "";
  const why = f.why_it_matters || "Impact not spelled out — please clarify before dismissing.";
  const detail = (f.body || "").trim();
  let out =
    `### ${emoji} ${sev}${pre} — ${f.title}\n\n` +
    `**Where:** \`${loc(f)}\`\n\n` +
    `**Why it matters:** ${why}\n`;
  if (detail && detail !== why) out += `\n${detail}\n`;
  out +=
    `\n---\n` +
    `_Agreed by ${f.models.join(", ")}. Fix it, or reply \`dismissed: <reason>\` and resolve the thread._\n` +
    `_No chat commands — Gatekeep doesn't take @-mentions._`;
  return out;
}

const sortedAgreed = [...(merged.agreed_findings || [])];
const sortedDisputed = [...(merged.disputed_findings || [])];

const agreedList =
  sortedAgreed.length === 0
    ? "_Nothing the models agreed on — nice, or spooky. Glance at disputed below._"
    : sortedAgreed.map((f) => formatFindingBlock(f)).join("\n\n");

const disputedList =
  sortedDisputed.length === 0
    ? "_No disagreements worth parking._"
    : sortedDisputed.map((f) => formatFindingBlock(f, { disputed: true })).join("\n\n");

const modelRows = merged.models
  .map(
    (m) =>
      `| \`${m.id}\` | \`${m.risk_tier}\` | ${m.finding_count}${m.error ? ` (err: ${m.error})` : ""} |`,
  )
  .join("\n");

const critCount = sortedAgreed.filter((f) => f.severity === "Critical").length;
const highCount = sortedAgreed.filter((f) => f.severity === "High").length;

const body = `${marker}
## Gatekeep review

Hey — here's the multi-model pass. **Severity first** so you can skim Critical → Low in seconds.

| | |
| --- | --- |
| **PR risk tier** | \`${merged.risk_tier}\` |
| Policy floor | \`${merged.policy_floor}\` |
| Agreement bar | ≥${merged.agreement_min} models |
| Agreed / disputed | ${sortedAgreed.length} / ${sortedDisputed.length} |
| Critical / High (agreed) | ${critCount} / ${highCount} |

${approvals(merged.risk_tier)}

### Models (parallel)
| Model | Their PR tier | Findings |
| --- | --- | --- |
${modelRows}

### Agreed findings
Sorted by severity. Each one spells out **severity**, **where**, and **why it matters**.
Fix or dismiss with \`dismissed: <reason>\` (then resolve the thread). Gatekeep has **no** chat / @-command surface.

${agreedList}

### Disputed (summary only — not posted inline)
One model saw it; others didn't. Useful signal, not a merge blocker by itself.

${disputedList}

### Deterministic security scan
${(scan.hits || []).length ? (scan.hits || []).map((h) => `- ${h}`).join("\n") : "_No hard-fail hits._"}

### Policy floor signals
${(floor.reasons || []).map((r) => `- ${r}`).join("\n") || "- none"}

### Still on humans
${(merged.human_focus || []).map((h) => `- ${h}`).join("\n") || "- taste, architecture, billing/CI/auth, reading the evidence"}

---
Missed something real? Open a **gatekeep-incident** issue — that's how it becomes an eval.
_Inline comments only when models agree. PR tier is fail-closed. Findings lead with severity + location + why._
`;

async function main() {
  const comments =
    (await forgeApi(
      "GET",
      `/repos/${owner}/${name}/issues/${pr.number}/comments?limit=100&per_page=100`,
    )) || [];
  const list = Array.isArray(comments) ? comments : [];
  const existing = list.find((c) => (c.body || "").includes(marker));
  if (existing) {
    await forgeApi("PATCH", `/repos/${owner}/${name}/issues/comments/${existing.id}`, { body });
  } else {
    await forgeApi("POST", `/repos/${owner}/${name}/issues/${pr.number}/comments`, { body });
  }

  const inline = sortedAgreed
    .filter((f) => f.path && f.line && f.severity !== "Low" && f.tag !== "Nit")
    .slice(0, 30)
    .map((f) => ({
      path: f.path,
      // Gitea uses old_position/new_position in some versions; line works on GitHub
      line: f.line,
      body: formatInline(f),
    }));

  if (inline.length) {
    try {
      await forgeApi("POST", `/repos/${owner}/${name}/pulls/${pr.number}/reviews`, {
        commit_id: pr.head.sha,
        event: "COMMENT",
        body: "Gatekeep agreed findings (severity · where · why). Fix or dismiss — no @-commands.",
        comments: inline,
      });
    } catch (e) {
      console.error("Inline review failed; falling back to issue comments:", e.message);
      for (const f of inline) {
        await forgeApi("POST", `/repos/${owner}/${name}/issues/${pr.number}/comments`, {
          body: f.body + `\n\n_\`${f.path}:${f.line}\`_`,
        });
      }
    }
  }

  for (const f of sortedAgreed) {
    if (
      (f.severity === "Critical" || f.severity === "High" || f.tag === "Important") &&
      !f.line &&
      f.path
    ) {
      await forgeApi("POST", `/repos/${owner}/${name}/issues/${pr.number}/comments`, {
        body: formatInline(f) + `\n\n_File-level (no single line) on \`${f.path}\`._`,
      });
    }
  }

  const want = `risk:${merged.risk_tier}`;
  for (const lab of ["risk:low", "risk:medium", "risk:high"]) {
    if (lab !== want) {
      try {
        await forgeApi(
          "DELETE",
          `/repos/${owner}/${name}/issues/${pr.number}/labels/${encodeURIComponent(lab)}`,
        );
      } catch {
        /* label may not exist */
      }
    }
  }
  try {
    // Gitea expects { labels: ["name"] }; GitHub same for issues API
    await forgeApi("POST", `/repos/${owner}/${name}/issues/${pr.number}/labels`, {
      labels: [want],
    });
  } catch (e) {
    console.error("label:", e.message);
  }

  const conclusion = merged.open_security_blocking ? "failure" : "success";
  const statusState = merged.open_security_blocking ? "failure" : "success";
  const desc = merged.open_security_blocking
    ? "Open security / Critical findings — merge blocked"
    : `PR risk ${merged.risk_tier} — no open security blockers`;

  // Prefer Checks API (GitHub); fall back to commit status (Gitea-friendly)
  try {
    await forgeApi("POST", `/repos/${owner}/${name}/check-runs`, {
      name: checkName,
      head_sha: pr.head.sha,
      status: "completed",
      conclusion,
      output: {
        title: desc,
        summary: desc,
      },
    });
  } catch {
    try {
      await forgeApi("POST", `/repos/${owner}/${name}/statuses/${pr.head.sha}`, {
        state: statusState,
        context: checkName,
        description: desc.slice(0, 140),
      });
    } catch (e2) {
      console.error("status/check publish failed:", e2.message);
    }
  }

  if (process.env.GITHUB_OUTPUT) {
    writeFileSync(
      process.env.GITHUB_OUTPUT,
      [
        `risk_tier=${merged.risk_tier}`,
        `security_blocking=${merged.open_security_blocking}`,
        `agreed_count=${sortedAgreed.length}`,
      ].join("\n") + "\n",
      { flag: "a" },
    );
  }

  if (merged.open_security_blocking) {
    console.error("Security blocking — exiting non-zero for job red X");
    process.exit(1);
  }
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});