/**
 * Tests for copyKey.
 *
 * inquirer and execa are mocked so nothing touches a TTY or the real
 * clipboard; the key directories are real temp directories.
 */

import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

const { execa, prompt, stdin } = vi.hoisted(() => ({
  execa: vi.fn(),
  prompt: vi.fn(),
  stdin: { write: vi.fn(), end: vi.fn() },
}));

vi.mock('execa', () => ({ execa }));
vi.mock('inquirer', () => ({ default: { prompt } }));

import { copyKey } from '../src/keyman.copy.js';

describe('copyKey', () => {
  let root: string;
  let sshDir: string;
  let tmpDir: string;
  let logSpy: ReturnType<typeof vi.spyOn>;
  let errorSpy: ReturnType<typeof vi.spyOn>;

  const touch = (dir: string, file: string, contents = '') => {
    fs.mkdirSync(dir, { recursive: true });
    fs.writeFileSync(path.join(dir, file), contents);
  };

  const messages = (spy: ReturnType<typeof vi.spyOn>) =>
    spy.mock.calls.map((c) => c.join(' ')).join('\n');

  /** The choices offered by the last inquirer.prompt call. */
  const choices = () => prompt.mock.calls.at(-1)?.[0][0].choices as string[];

  beforeEach(() => {
    vi.clearAllMocks();
    root = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'keyman-copy-')));
    sshDir = path.join(root, '.ssh');
    tmpDir = path.join(root, 'tmp');
    logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
    errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});

    const proc = Object.assign(Promise.resolve({ exitCode: 0 }), { stdin });
    execa.mockReturnValue(proc);
  });

  afterEach(() => {
    vi.restoreAllMocks();
    fs.rmSync(root, { recursive: true, force: true });
  });

  it('warns when neither directory exists', async () => {
    await copyKey(sshDir, tmpDir);

    expect(messages(logSpy)).toContain('No SSH keys found.');
    expect(prompt).not.toHaveBeenCalled();
  });

  it('warns when the directories hold no private keys', async () => {
    touch(sshDir, 'known_hosts');
    touch(tmpDir, 'id_prod.pub');

    await copyKey(sshDir, tmpDir);

    expect(messages(logSpy)).toContain('No SSH keys found.');
  });

  it('offers the keys from both directories without duplicates', async () => {
    touch(sshDir, 'id_prod');
    touch(sshDir, 'id_prod.pub');
    touch(tmpDir, 'id_prod');
    touch(tmpDir, 'id_stage');
    prompt.mockResolvedValue({ selectedKey: 'id_prod' });
    touch(tmpDir, 'id_prod.pub');

    await copyKey(sshDir, tmpDir);

    expect(choices()).toEqual(['id_prod', 'id_stage']);
  });

  it('copies the trimmed public key from tmp to the clipboard', async () => {
    touch(tmpDir, 'id_prod');
    touch(tmpDir, 'id_prod.pub', 'ssh-ed25519 AAAA tmp\n');
    touch(sshDir, 'id_prod.pub', 'ssh-ed25519 AAAA ssh\n');
    prompt.mockResolvedValue({ selectedKey: 'id_prod' });

    await copyKey(sshDir, tmpDir);

    expect(execa).toHaveBeenCalledWith('pbcopy');
    expect(stdin.write).toHaveBeenCalledWith('ssh-ed25519 AAAA tmp');
    expect(stdin.end).toHaveBeenCalled();
    expect(messages(logSpy)).toContain('copied to clipboard');
  });

  it('falls back to the public key in .ssh', async () => {
    touch(sshDir, 'id_prod');
    touch(sshDir, 'id_prod.pub', 'ssh-ed25519 AAAA ssh\n');
    prompt.mockResolvedValue({ selectedKey: 'id_prod' });

    await copyKey(sshDir, tmpDir);

    expect(stdin.write).toHaveBeenCalledWith('ssh-ed25519 AAAA ssh');
  });

  it('reports a missing public key without invoking the clipboard', async () => {
    touch(sshDir, 'id_prod');
    prompt.mockResolvedValue({ selectedKey: 'id_prod' });

    await copyKey(sshDir, tmpDir);

    expect(messages(errorSpy)).toContain('Public key not found for id_prod');
    expect(execa).not.toHaveBeenCalled();
  });

  it('reports a clipboard failure instead of throwing', async () => {
    touch(sshDir, 'id_prod');
    touch(sshDir, 'id_prod.pub', 'ssh-ed25519 AAAA ssh');
    prompt.mockResolvedValue({ selectedKey: 'id_prod' });
    execa.mockImplementation(() => {
      throw new Error('pbcopy missing');
    });

    await expect(copyKey(sshDir, tmpDir)).resolves.toBeUndefined();
    expect(messages(errorSpy)).toContain('Failed to copy to clipboard');
  });
});