import { describe, it, expect, beforeAll } from "vitest";
import { spawnSync } from "node:child_process";
import { existsSync } from "node:fs";
import { resolve } from "node:path";

const cliPath = resolve(__dirname, "..", "dist", "cli.js");

function runCli(
  args: string[],
  opts: { env?: Record<string, string | undefined>; stdin?: string } = {},
): { status: number; stdout: string; stderr: string } {
  const r = spawnSync(process.execPath, [cliPath, ...args], {
    encoding: "utf8",
    env: { ...process.env, ...(opts.env ?? {}) },
    input: opts.stdin,
  });
  return {
    status: r.status ?? -1,
    stdout: typeof r.stdout === "string" ? r.stdout : "",
    stderr: typeof r.stderr === "string" ? r.stderr : "",
  };
}

const HOOK_STDIN = JSON.stringify({
  session_id: "abc12345-de67-89f0-1234-567890abcdef",
  hook_event_name: "UserPromptSubmit",
  cwd: "/tmp",
  prompt: "test",
});

describe("`check --hook` CLI behavior", () => {
  beforeAll(() => {
    if (!existsSync(cliPath)) {
      throw new Error(`CLI not built. Run \`npm run build\` first. Missing: ${cliPath}`);
    }
  });

  it("exits 0 silently when no stdin and no --name", () => {
    const r = runCli(["check", "--hook"]);
    expect(r.status).toBe(0);
    expect(r.stdout).toBe("");
    expect(r.stderr).toBe("");
  });

  it("derives session-id-based name from stdin and emits daemon hint when down", () => {
    const r = runCli(["check", "--hook", "--url", "http://127.0.0.1:1"], {
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
  });

  it("explicit --name overrides session-id derivation", () => {
    const r = runCli(
      ["check", "--hook", "--name", "explicit", "--url", "http://127.0.0.1:1"],
      { stdin: HOOK_STDIN },
    );
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
  });

  it("uses CLAUDE_MAILBOX_URL env as default base URL when --url is not given", () => {
    const r = runCli(["check", "--hook"], {
      env: { CLAUDE_MAILBOX_URL: "http://127.0.0.1:1" },
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable at http://127.0.0.1:1");
  });

  it("non-hook mode errors out when no name resolved", () => {
    const r = runCli(["check"]);
    expect(r.status).not.toBe(0);
    expect(r.stderr).toContain("Missing --name");
  });
});

describe("`session-announce` CLI behavior", () => {
  const UNREACHABLE = "http://127.0.0.1:1";

  beforeAll(() => {
    if (!existsSync(cliPath)) {
      throw new Error(`CLI not built. Run \`npm run build\` first. Missing: ${cliPath}`);
    }
  });

  it("prints the derived mailbox name from a SessionStart payload (project-prefixed)", () => {
    // cwd "/tmp" is not a git repo → basename "tmp" → project prefix "tmp".
    const r = runCli(["session-announce", "--url", UNREACHABLE], {
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    // The exact prefix depends on the runtime cwd if git resolves; the deterministic
    // assertion is the session-short suffix and the announcement structure.
    expect(r.stdout).toMatch(/`[a-z0-9-]+-abc12345`/);
    expect(r.stdout).toContain("mcp__mailbox__send");
    expect(r.stdout).toMatch(/from="[a-z0-9-]+-abc12345"/);
  });

  it("includes a hint about the rename tool", () => {
    const r = runCli(["session-announce", "--url", UNREACHABLE], { stdin: HOOK_STDIN });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("mcp__mailbox__rename");
  });

  it("emits daemon-not-reachable hint when daemon is down", () => {
    const r = runCli(["session-announce", "--url", UNREACHABLE], { stdin: HOOK_STDIN });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
  });

  it("stays silent when no session_id in stdin", () => {
    const r = runCli(["session-announce", "--url", UNREACHABLE], {
      stdin: JSON.stringify({ hook_event_name: "SessionStart" }),
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toBe("");
  });

  it("stays silent when no stdin at all", () => {
    const r = runCli(["session-announce", "--url", UNREACHABLE]);
    expect(r.status).toBe(0);
    expect(r.stdout).toBe("");
  });
});