import { beforeEach, describe, expect, it, vi } from 'vitest';

describe('transcript export IPC', () => {
  beforeEach(() => {
    vi.resetModules();
    vi.clearAllMocks();
    vi.doUnmock('electron');
    vi.doUnmock('node:fs/promises');
  });

  it('lets Main choose the destination and write the markdown as UTF-8', async () => {
    const handle = vi.fn();
    const showSaveDialog = vi.fn().mockResolvedValue({
      canceled: false,
      filePath: 'D:\\Exports\\session.md',
    });
    const writeFile = vi.fn().mockResolvedValue(undefined);
    vi.doMock('electron', () => ({
      dialog: { showSaveDialog },
      ipcMain: { handle },
    }));
    vi.doMock('node:fs/promises', () => ({
      default: { writeFile },
      writeFile,
    }));

    const { registerTranscriptExportHandler } = await import(
      '../../electron/main/ipc/transcript-export'
    );
    const mainWindow = { id: 1 } as Electron.BrowserWindow;
    registerTranscriptExportHandler(mainWindow);

    const handler = handle.mock.calls.find(([channel]) => channel === 'transcript:save')?.[1];
    expect(handler).toBeTypeOf('function');

    await expect(handler(undefined, {
      defaultPath: 'session.md',
      markdown: '# Visible transcript\n',
    })).resolves.toEqual({ status: 'saved' });
    expect(showSaveDialog).toHaveBeenCalledWith(mainWindow, {
      defaultPath: 'session.md',
      filters: [{ name: 'Markdown', extensions: ['md'] }],
    });
    expect(writeFile).toHaveBeenCalledWith(
      'D:\\Exports\\session.md',
      '# Visible transcript\n',
      'utf8',
    );
  });

  it('does not write when the Main-owned save dialog is cancelled', async () => {
    const handle = vi.fn();
    const showSaveDialog = vi.fn().mockResolvedValue({ canceled: true });
    const writeFile = vi.fn();
    vi.doMock('electron', () => ({
      dialog: { showSaveDialog },
      ipcMain: { handle },
    }));
    vi.doMock('node:fs/promises', () => ({
      default: { writeFile },
      writeFile,
    }));

    const { registerTranscriptExportHandler } = await import(
      '../../electron/main/ipc/transcript-export'
    );
    registerTranscriptExportHandler({ id: 1 } as Electron.BrowserWindow);

    const handler = handle.mock.calls.find(([channel]) => channel === 'transcript:save')?.[1];
    await expect(handler(undefined, {
      defaultPath: 'session.md',
      markdown: '# Visible transcript\n',
    })).resolves.toEqual({ status: 'cancelled' });
    expect(writeFile).not.toHaveBeenCalled();
  });

  it('rejects an oversized transcript before opening the save dialog', async () => {
    const handle = vi.fn();
    const showSaveDialog = vi.fn();
    const writeFile = vi.fn();
    vi.doMock('electron', () => ({
      dialog: { showSaveDialog },
      ipcMain: { handle },
    }));
    vi.doMock('node:fs/promises', () => ({
      default: { writeFile },
      writeFile,
    }));

    const { registerTranscriptExportHandler } = await import(
      '../../electron/main/ipc/transcript-export'
    );
    registerTranscriptExportHandler({ id: 1 } as Electron.BrowserWindow);

    const handler = handle.mock.calls.find(([channel]) => channel === 'transcript:save')?.[1];
    await expect(handler(undefined, {
      defaultPath: 'session.md',
      markdown: 'a'.repeat((10 * 1024 * 1024) + 1),
    })).rejects.toThrow('Transcript is too large');
    expect(showSaveDialog).not.toHaveBeenCalled();
    expect(writeFile).not.toHaveBeenCalled();
  });

  it('does not expose the selected absolute path when writing fails', async () => {
    const handle = vi.fn();
    const showSaveDialog = vi.fn().mockResolvedValue({
      canceled: false,
      filePath: 'D:\\Secret\\session.md',
    });
    const writeFile = vi.fn().mockRejectedValue(
      new Error('EACCES: D:\\Secret\\session.md'),
    );
    vi.doMock('electron', () => ({
      dialog: { showSaveDialog },
      ipcMain: { handle },
    }));
    vi.doMock('node:fs/promises', () => ({
      default: { writeFile },
      writeFile,
    }));

    const { registerTranscriptExportHandler } = await import(
      '../../electron/main/ipc/transcript-export'
    );
    registerTranscriptExportHandler({ id: 1 } as Electron.BrowserWindow);

    const handler = handle.mock.calls.find(([channel]) => channel === 'transcript:save')?.[1];
    await expect(handler(undefined, {
      defaultPath: 'session.md',
      markdown: '# Visible transcript\n',
    })).rejects.toThrow(/^Failed to save transcript$/);
  });

  it('exposes only the dedicated transcript save request to the Renderer wrapper', async () => {
    const invoke = vi.fn().mockResolvedValue({ status: 'saved' });
    window.electron.ipcRenderer.invoke = invoke;

    const { saveMarkdownTranscript } = await import('@/lib/api-client');

    await expect(saveMarkdownTranscript(
      'session.md',
      '# Visible transcript\n',
    )).resolves.toBe('saved');
    expect(invoke).toHaveBeenCalledWith('transcript:save', {
      defaultPath: 'session.md',
      markdown: '# Visible transcript\n',
    });
    expect(invoke).not.toHaveBeenCalledWith('dialog:save', expect.anything());
    expect(invoke).not.toHaveBeenCalledWith('file:writeText', expect.anything());
  });

  it('allows transcript save through preload without exposing generic file writes', async () => {
    const exposeInMainWorld = vi.fn();
    const invoke = vi.fn().mockResolvedValue({ status: 'saved' });
    vi.doMock('electron', () => ({
      contextBridge: { exposeInMainWorld },
      ipcRenderer: {
        invoke,
        on: vi.fn(),
        once: vi.fn(),
        removeAllListeners: vi.fn(),
        removeListener: vi.fn(),
      },
    }));

    await import('../../electron/preload/index');
    const exposedApi = exposeInMainWorld.mock.calls.find(
      ([name]) => name === 'electron',
    )?.[1] as {
      ipcRenderer: {
        invoke: (channel: string, ...args: unknown[]) => Promise<unknown>;
      };
    };

    await expect(exposedApi.ipcRenderer.invoke(
      'transcript:save',
      { defaultPath: 'session.md', markdown: '# Visible transcript\n' },
    )).resolves.toEqual({ status: 'saved' });
    expect(() => exposedApi.ipcRenderer.invoke(
      'file:writeText',
      'D:\\Secret\\owned.txt',
      'payload',
    )).toThrow('Invalid IPC channel: file:writeText');
    expect(invoke).toHaveBeenCalledOnce();
    expect(invoke).toHaveBeenCalledWith(
      'transcript:save',
      { defaultPath: 'session.md', markdown: '# Visible transcript\n' },
    );
  });
});