// Agent journey — simulate an EXTERNAL AI platform driving a full PR
// lifecycle against a live Gluecron instance, using exactly the surface
// such a platform would use: a PAT bearer on MCP tools + git-over-HTTPS
// with token basic-auth. This is the go/no-go certification for "other
// platforms can open and merge PRs here".
//
//   1. identity        GET /api/v2/user
//   2. create repo     POST /api/v2/repos          (no MCP create-repo tool exists — platform gap, noted)
//   3. git push        smart-HTTP receive-pack with PAT basic auth
//   4. branch + edit   gluecron_create_branch + gluecron_write_file
//   5. open PR         gluecron_create_pr
//   6. comment         gluecron_comment_pr
//   7. AI review       poll PR comments for the ai-review marker (WARN if absent)
//   8. merge           gluecron_merge_pr → gluecron_get_pr state=merged
//   9. events          GET /api/v2/repos/:o/:r/activity
//  10. cleanup         gluecron_delete_repo (always, unless KEEP_REPO=1)
//
// Run:  bun run scripts/agent-journey.ts
// Env:  GLUECRON_PAT   REQUIRED — admin-scope PAT (merge + delete need it)
//       GLUECRON_HOST  target (default https://gluecron.com)
//       KEEP_REPO=1    skip cleanup for debugging
// Exit: 0 iff all steps pass (step 7 is WARN-only — AI review may be
//       legitimately disabled). Never touches any existing repo.

import { AI_REVIEW_MARKER } from "../src/lib/ai-review";
import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";

const HOST = (process.env.GLUECRON_HOST || "https://gluecron.com").replace(/\/+$/, "");
const PAT = process.env.GLUECRON_PAT?.trim() || "";
const KEEP = process.env.KEEP_REPO === "1";

if (!PAT) {
  console.error("GLUECRON_PAT is required (admin scope). Mint one at /settings/tokens or via scripts/emergency-pat.ts.");
  process.exit(2);
}

// Hard safety guard: the scratch repo name is generated here and must never
// collide with the self-host repo (its post-receive hook triggers deploys).
const REPO = `journey-${new Date().toISOString().slice(0, 19).replace(/[:T-]/g, "")}-${Math.random().toString(36).slice(2, 6)}`;
const FORBIDDEN = /gluecron\.com/i;
if (FORBIDDEN.test(REPO)) throw new Error("unreachable: scratch repo name collided with self-host repo");

// ─── plumbing ────────────────────────────────────────────────────────

async function api(method: string, path: string, body?: unknown) {
  const res = await fetch(HOST + path, {
    method,
    headers: {
      authorization: `Bearer ${PAT}`,
      ...(body !== undefined ? { "content-type": "application/json" } : {}),
    },
    ...(body !== undefined ? { body: JSON.stringify(body) } : {}),
  });
  const text = await res.text();
  let json: any = null;
  try { json = JSON.parse(text); } catch { /* non-JSON */ }
  return { status: res.status, json, text };
}

let rpcId = 0;
async function mcp(tool: string, args: Record<string, unknown>) {
  const res = await fetch(HOST + "/mcp", {
    method: "POST",
    headers: { authorization: `Bearer ${PAT}`, "content-type": "application/json" },
    body: JSON.stringify({ jsonrpc: "2.0", id: ++rpcId, method: "tools/call", params: { name: tool, arguments: args } }),
  });
  const json: any = await res.json();
  if (res.status !== 200 || json.error) {
    throw new Error(`${tool} → HTTP ${res.status} ${JSON.stringify(json.error ?? json).slice(0, 300)}`);
  }
  if (json.result?.isError) {
    throw new Error(`${tool} → tool error: ${JSON.stringify(json.result.content).slice(0, 300)}`);
  }
  // MCP text content is JSON-stringified tool output; parse when possible.
  const textPart = (json.result?.content ?? []).find((p: any) => p.type === "text")?.text;
  try { return JSON.parse(textPart); } catch { return textPart; }
}

function git(cwd: string, ...args: string[]): string {
  const proc = Bun.spawnSync(["git", ...args], { cwd, stdout: "pipe", stderr: "pipe" });
  const out = new TextDecoder().decode(proc.stdout);
  const err = new TextDecoder().decode(proc.stderr);
  if (proc.exitCode !== 0) throw new Error(`git ${args[0]} failed (${proc.exitCode}): ${(err || out).slice(0, 300)}`);
  return out.trim();
}

interface StepResult { name: string; ok: boolean; warn?: boolean; ms: number; detail?: string }
const results: StepResult[] = [];

async function step<T>(name: string, fn: () => Promise<T>, opts: { warnOnly?: boolean } = {}): Promise<T | null> {
  const t0 = Date.now();
  try {
    const v = await fn();
    results.push({ name, ok: true, ms: Date.now() - t0 });
    console.log(`PASS  ${name}  (${Date.now() - t0}ms)`);
    return v;
  } catch (err) {
    const detail = (err as Error).message;
    results.push({ name, ok: !!opts.warnOnly, warn: opts.warnOnly, ms: Date.now() - t0, detail });
    console.log(`${opts.warnOnly ? "WARN" : "FAIL"}  ${name}  — ${detail}`);
    if (!opts.warnOnly) throw err;
    return null;
  }
}

// ─── the journey ─────────────────────────────────────────────────────

async function main() {
  console.log(`# agent-journey — ${HOST} — scratch repo "${REPO}" — ${new Date().toISOString()}\n`);
  let owner = "";
  let repoCreated = false;

  try {
    // 1. identity
    const user = await step("1. PAT identity (GET /api/v2/user)", async () => {
      const r = await api("GET", "/api/v2/user");
      if (r.status !== 200 || !r.json?.username) throw new Error(`HTTP ${r.status}: ${r.text.slice(0, 200)}`);
      return r.json;
    });
    owner = user!.username;
    if (`${owner}/${REPO}`.toLowerCase() === "ccantynz/gluecron.com") throw new Error("safety: refusing to touch the self-host repo");

    // 2. create scratch repo
    await step("2. create scratch repo (POST /api/v2/repos)", async () => {
      const r = await api("POST", "/api/v2/repos", { name: REPO, description: "agent-journey probe — auto-deleted", private: false });
      if (r.status !== 200 && r.status !== 201) throw new Error(`HTTP ${r.status}: ${r.text.slice(0, 200)}`);
      repoCreated = true;
    });

    // 3. git push over smart HTTP with PAT basic auth
    const pushUrl = `${HOST.replace("://", `://${encodeURIComponent(owner)}:${PAT}@`)}/${owner}/${REPO}.git`;
    const mainSha = await step("3. git push main over HTTPS (PAT basic auth)", async () => {
      const dir = mkdtempSync(join(tmpdir(), "gluecron-journey-"));
      try {
        git(dir, "init", "-b", "main");
        git(dir, "config", "user.email", "journey@gluecron.com");
        git(dir, "config", "user.name", "agent-journey");
        writeFileSync(join(dir, "README.md"), `# ${REPO}\n\nExternal-platform journey probe.\n`);
        git(dir, "add", ".");
        git(dir, "commit", "-m", "chore: journey seed commit");
        const sha = git(dir, "rev-parse", "HEAD");
        git(dir, "push", pushUrl, "main");
        return sha;
      } finally {
        rmSync(dir, { recursive: true, force: true });
      }
    });

    // 4. branch + file via MCP write tools
    await step("4a. gluecron_create_branch", () => mcp("gluecron_create_branch", { owner, repo: REPO, branch: "feature/journey", sha: mainSha }));
    await step("4b. gluecron_write_file on branch", () => mcp("gluecron_write_file", { owner, repo: REPO, path: "probe.md", branch: "feature/journey", message: "feat: journey probe file", content: `probe ${new Date().toISOString()}\n` }));

    // 5. open PR
    const pr = await step("5. gluecron_create_pr", () => mcp("gluecron_create_pr", { owner, repo: REPO, title: "Journey probe PR", body: "Opened by scripts/agent-journey.ts — will be merged and the repo deleted.", head_branch: "feature/journey", base_branch: "main" }));
    const prNumber: number = pr!.number;

    // 6. comment
    await step("6. gluecron_comment_pr", () => mcp("gluecron_comment_pr", { owner, repo: REPO, number: prNumber, body: `Journey probe comment ${new Date().toISOString()}` }));

    // 7. AI review (WARN-only: may be disabled / unfunded)
    await step("7. AI review fired (poll for marker, ≤90s)", async () => {
      const deadline = Date.now() + 90_000;
      while (Date.now() < deadline) {
        const r = await api("GET", `/api/v2/repos/${owner}/${REPO}/pulls/${prNumber}`);
        const comments: Array<{ body?: string; isAiReview?: boolean }> = r.json?.comments ?? [];
        if (comments.some((cm) => cm.isAiReview || cm.body?.includes(AI_REVIEW_MARKER))) return true;
        await new Promise((res) => setTimeout(res, 5000));
      }
      throw new Error("no AI-review comment within 90s (review disabled, or ANTHROPIC_API_KEY unset?)");
    }, { warnOnly: true });

    // 8. merge + verify
    await step("8a. gluecron_merge_pr", async () => {
      const m = await mcp("gluecron_merge_pr", { owner, repo: REPO, number: prNumber });
      if (!m?.merged) throw new Error(`not merged: ${JSON.stringify(m).slice(0, 200)}`);
      return m;
    });
    await step("8b. PR state is merged + main advanced", async () => {
      const detail = await mcp("gluecron_get_pr", { owner, repo: REPO, number: prNumber });
      const state = detail?.state ?? detail?.pr?.state;
      if (state !== "merged") throw new Error(`PR state: ${state}`);
      const dir = mkdtempSync(join(tmpdir(), "gluecron-lsr-"));
      try {
        git(dir, "init");
        const head = git(dir, "ls-remote", pushUrl, "refs/heads/main").split(/\s/)[0];
        if (head === mainSha) throw new Error("main did not advance past the seed commit");
      } finally {
        rmSync(dir, { recursive: true, force: true });
      }
    });

    // 9. events — WARN-only (known platform gap, 2026-07-15): activityFeed is
    // only written by fork/use-template/claude-connect/reviewer-suggest.
    // None of git push, MCP branch/PR/comment/merge, or POST /api/v2/repos
    // insert an activityFeed row, so dashboards rolling it up are blind to
    // everything this journey just did. Real gap, not a test bug — tracked
    // separately; not a reason to fail the merge-lifecycle certification.
    await step("9. activity feed recorded push + PR events", async () => {
      const r = await api("GET", `/api/v2/repos/${owner}/${REPO}/activity`);
      if (r.status !== 200) throw new Error(`HTTP ${r.status}`);
      // GET /api/v2/repos/:owner/:repo/activity returns a bare array.
      const events: Array<{ type?: string }> = Array.isArray(r.json)
        ? r.json
        : r.json?.events ?? r.json?.activity ?? [];
      if (!Array.isArray(events) || events.length === 0) throw new Error("no activity events (known gap — see comment above)");
    }, { warnOnly: true });
  } finally {
    // 10. cleanup — always attempt when the repo was created
    if (repoCreated && !KEEP) {
      try {
        await mcp("gluecron_delete_repo", { owner, repo: REPO });
        console.log(`PASS  10. cleanup — deleted ${owner}/${REPO}`);
        results.push({ name: "10. cleanup (gluecron_delete_repo)", ok: true, ms: 0 });
      } catch (err) {
        console.error(`FAIL  10. cleanup — LEFTOVER REPO ${owner}/${REPO}: ${(err as Error).message}`);
        results.push({ name: "10. cleanup (gluecron_delete_repo)", ok: false, ms: 0, detail: `LEFTOVER ${owner}/${REPO}` });
      }
    } else if (repoCreated) {
      console.log(`KEEP  10. cleanup skipped (KEEP_REPO=1) — ${owner}/${REPO}`);
    }
  }

  const failed = results.filter((r) => !r.ok).length;
  const warned = results.filter((r) => r.warn).length;
  console.log(`\n# agent-journey: ${failed === 0 ? "ALL GREEN" : `${failed} FAILURE(S)`}${warned ? ` — ${warned} warning(s)` : ""}`);
  process.exit(failed === 0 ? 0 : 1);
}

main().catch((err) => {
  console.error(`\n# agent-journey: FAILED — ${(err as Error).message}`);
  process.exit(1);
});