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, no --name, no env", () => {
    const r = runCli(["check", "--hook"], { env: { CLAUDE_MAILBOX_NAME: undefined } });
    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"], {
      env: { CLAUDE_MAILBOX_NAME: undefined },
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
  });

  it("uses base prefix from CLAUDE_MAILBOX_NAME when both env and stdin present", () => {
    // We can't directly assert the name from --hook output (it's only in the unreachable hint URL).
    // The hint always contains the URL we passed, so this just confirms the path runs without error.
    const r = runCli(["check", "--hook", "--url", "http://127.0.0.1:1"], {
      env: { CLAUDE_MAILBOX_NAME: "backend" },
      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"],
      { env: { CLAUDE_MAILBOX_NAME: "ignored" }, stdin: HOOK_STDIN },
    );
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
  });

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

describe("`session-announce` CLI behavior", () => {
  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", () => {
    const r = runCli(["session-announce"], {
      env: { CLAUDE_MAILBOX_NAME: undefined },
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("`claude-abc12345`");
    expect(r.stdout).toContain("mcp__mailbox__send");
    expect(r.stdout).toContain(`from="claude-abc12345"`);
  });

  it("uses base prefix when set", () => {
    const r = runCli(["session-announce"], {
      env: { CLAUDE_MAILBOX_NAME: "backend" },
      stdin: HOOK_STDIN,
    });
    expect(r.status).toBe(0);
    expect(r.stdout).toContain("`backend-abc12345`");
  });

  it("stays silent when no session_id in stdin", () => {
    const r = runCli(["session-announce"], {
      env: { CLAUDE_MAILBOX_NAME: undefined },
      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"], { env: { CLAUDE_MAILBOX_NAME: undefined } });
    expect(r.status).toBe(0);
    expect(r.stdout).toBe("");
  });
});