import { describe, it, expect, vi, beforeEach } from 'vitest';
import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';

// Mock the API module FIRST so the real class export is replaced before
// FileUploadDropzone imports it.
vi.mock('@/lib/stackFilesApi', () => {
  class MockUploadConflictError extends Error {
    readonly code = 'FILE_EXISTS' as const;
    constructor(message: string) {
      super(message);
      this.name = 'UploadConflictError';
    }
  }
  return {
    uploadStackFile: vi.fn(),
    UploadConflictError: MockUploadConflictError,
  };
});

vi.mock('@/components/ui/toast-store', () => ({
  toast: {
    error: vi.fn(),
    success: vi.fn(),
    loading: vi.fn(() => 'loading-id'),
    dismiss: vi.fn(),
  },
}));

import { FileUploadDropzone } from '../FileUploadDropzone';
import { uploadStackFile, UploadConflictError } from '@/lib/stackFilesApi';

const mockUpload = uploadStackFile as unknown as ReturnType<typeof vi.fn>;

beforeEach(() => {
  mockUpload.mockReset();
});

describe('FileUploadDropzone', () => {
  it('renders upload control for users with stack edit permission', () => {
    render(
      <FileUploadDropzone
        stackName="app"
        currentDir=""
        canEdit
        onUploaded={vi.fn()}
      />,
    );

    expect(screen.getByRole('button', { name: /upload file/i })).toBeInTheDocument();
  });

  it('hides upload control when the user cannot edit the stack', () => {
    render(
      <FileUploadDropzone
        stackName="app"
        currentDir=""
        canEdit={false}
        onUploaded={vi.fn()}
      />,
    );

    expect(screen.queryByRole('button', { name: /upload file/i })).not.toBeInTheDocument();
  });

  it('opens the replace dialog on FILE_EXISTS and retries with overwrite on confirm', async () => {
    const user = userEvent.setup();
    const onUploaded = vi.fn();
    mockUpload
      .mockRejectedValueOnce(new UploadConflictError('foo.txt already exists.'))
      .mockResolvedValueOnce(undefined);

    render(
      <FileUploadDropzone stackName="app" currentDir="" canEdit onUploaded={onUploaded} />,
    );

    const input = screen.getByLabelText(/upload file/i) as HTMLInputElement;
    const file = new File(['payload'], 'foo.txt', { type: 'text/plain' });
    await user.upload(input, file);

    expect(await screen.findByText(/replace existing file/i)).toBeInTheDocument();
    expect(mockUpload).toHaveBeenCalledTimes(1);
    expect(mockUpload).toHaveBeenNthCalledWith(1, 'app', '', file, { overwrite: false });

    await user.click(screen.getByRole('button', { name: /^replace$/i }));

    expect(mockUpload).toHaveBeenCalledTimes(2);
    expect(mockUpload).toHaveBeenNthCalledWith(2, 'app', '', file, { overwrite: true });
    expect(onUploaded).toHaveBeenCalledTimes(1);
  });

  it('leaves the original file untouched when the user cancels the replace dialog', async () => {
    const user = userEvent.setup();
    const onUploaded = vi.fn();
    mockUpload.mockRejectedValueOnce(new UploadConflictError('foo.txt already exists.'));

    render(
      <FileUploadDropzone stackName="app" currentDir="" canEdit onUploaded={onUploaded} />,
    );

    const input = screen.getByLabelText(/upload file/i) as HTMLInputElement;
    const file = new File(['payload'], 'foo.txt', { type: 'text/plain' });
    await user.upload(input, file);

    expect(await screen.findByText(/replace existing file/i)).toBeInTheDocument();
    await user.click(screen.getByRole('button', { name: /^cancel$/i }));

    expect(mockUpload).toHaveBeenCalledTimes(1);
    expect(onUploaded).not.toHaveBeenCalled();
  });
});