import { describe, it, expect, beforeEach, afterEach } from "vitest";
import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";
import { spawn } from "node:child_process";
import { MailboxStore } from "../src/db.js";
import { buildServer } from "../src/server.js";
import type { FastifyInstance } from "fastify";

const here = dirname(fileURLToPath(import.meta.url));
const CLI = join(here, "..", "dist", "cli.js");

let dir: string;
let store: MailboxStore;
let app: FastifyInstance;
let baseUrl: string;

beforeEach(async () => {
  dir = mkdtempSync(join(tmpdir(), "claude-mailbox-cli-watch-"));
  store = new MailboxStore(join(dir, "test.db"));
  app = await buildServer(
    {
      port: 0,
      bind: "127.0.0.1",
      dbPath: join(dir, "test.db"),
      hideAfterMinutes: 0,
      deleteAfterMinutes: 0,
      sweepIntervalMinutes: 0,
    },
    store,
  );
  await app.listen({ host: "127.0.0.1", port: 0 });
  const addr = app.server.address();
  if (!addr || typeof addr === "string") throw new Error("no address");
  baseUrl = `http://127.0.0.1:${addr.port}`;
});

afterEach(async () => {
  store.rejectAllWaiters();
  await app.close();
  store.close();
  rmSync(dir, { recursive: true, force: true });
});

// Async helper: spawn CLI and collect output without blocking the event loop.
// spawnSync cannot be used here because the test process hosts the Fastify server,
// and spawnSync blocks the event loop, preventing the server from handling connections.
function runCli(args: string[], timeoutMs: number = 8000): Promise<{
  status: number | null;
  stdout: string;
  stderr: string;
}> {
  return new Promise((resolve) => {
    const child = spawn(process.execPath, [CLI, ...args], {
      stdio: ["ignore", "pipe", "pipe"],
    });
    let stdout = "";
    let stderr = "";
    child.stdout.on("data", (d) => { stdout += d.toString(); });
    child.stderr.on("data", (d) => { stderr += d.toString(); });
    const timer = setTimeout(() => {
      child.kill();
      resolve({ status: null, stdout, stderr });
    }, timeoutMs);
    child.on("exit", (code) => {
      clearTimeout(timer);
      resolve({ status: code, stdout, stderr });
    });
  });
}

describe("claude-mailbox watch CLI", () => {
  it("exits 0 with a formatted message when one is pending", async () => {
    store.upsertMailbox("alice");
    store.upsertMailbox("bob");
    store.send("alice", "bob", "hello watcher");

    const r = await runCli(["watch", "--block", "--name", "bob", "--timeout", "2", "--url", baseUrl]);
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Mail from alice:");
    expect(r.stdout).toContain("hello watcher");
  });

  it("exits 3 silently on timeout", async () => {
    store.upsertMailbox("bob");
    const r = await runCli(["watch", "--block", "--name", "bob", "--timeout", "1", "--url", baseUrl]);
    expect(r.status).toBe(3);
    expect(r.stdout).toBe("");
  });

  it("exits 0 with rename notice when the mailbox is renamed mid-wait", async () => {
    store.upsertMailbox("oldname");
    const child = spawn(
      process.execPath,
      [CLI, "watch", "--block", "--name", "oldname", "--timeout", "3", "--url", baseUrl],
      { stdio: ["ignore", "pipe", "pipe"] },
    );
    let stdout = "";
    child.stdout.on("data", (d) => { stdout += d.toString(); });

    setTimeout(() => store.rename("oldname", "newname"), 300);

    const code: number = await new Promise((r) => child.on("exit", (c) => r(c ?? 1)));
    expect(code).toBe(0);
    expect(stdout).toContain("renamed to 'newname'");
  });

  it("exits 2 when the daemon is unreachable", async () => {
    const r = await runCli([
      "watch", "--block", "--name", "bob", "--timeout", "1",
      "--url", "http://127.0.0.1:1", // port 1 = guaranteed connection refused
    ]);
    expect(r.status).toBe(2);
  });

  it("exits 1 when --name is missing", async () => {
    const r = await runCli(["watch", "--block", "--timeout", "1", "--url", baseUrl]);
    expect(r.status).not.toBe(0);
    expect(r.stderr).toMatch(/required.*name|name.*required/i);
  });
});