/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import {
  describe,
  it,
  expect,
  vi,
  beforeEach,
  afterEach,
  type Mock,
} from 'vitest';
import { act } from 'react';
import { renderHook } from '../../test-utils/render.js';
import { usePermissionsModifyTrust } from './usePermissionsModifyTrust.js';
import { TrustLevel } from '../../config/trustedFolders.js';
import type { LoadedSettings } from '../../config/settings.js';
import type { LoadedTrustedFolders } from '../../config/trustedFolders.js';
import { coreEvents } from '@google/gemini-cli-core';

// Hoist mocks
const mockedCwd = vi.hoisted(() => vi.fn());
const mockedLoadTrustedFolders = vi.hoisted(() => vi.fn());
const mockedIsWorkspaceTrusted = vi.hoisted(() => vi.fn());
const mockedUseSettings = vi.hoisted(() => vi.fn());

// Mock modules
vi.mock('node:process', () => {
  const mockProcess = {
    cwd: mockedCwd,
    env: {},
  };
  return {
    ...mockProcess,
    default: mockProcess,
  };
});

vi.mock('node:path', async (importOriginal) => {
  const actual = await importOriginal();
  return {
    ...(actual && typeof actual === 'object' ? actual : {}),
    resolve: vi.fn((p) => p),
    join: vi.fn((...args) => args.join('/')),
  };
});

vi.mock('../../config/trustedFolders.js', () => ({
  loadTrustedFolders: mockedLoadTrustedFolders,
  isWorkspaceTrusted: mockedIsWorkspaceTrusted,
  TrustLevel: {
    TRUST_FOLDER: 'TRUST_FOLDER',
    TRUST_PARENT: 'TRUST_PARENT',
    DO_NOT_TRUST: 'DO_NOT_TRUST',
  },
}));

vi.mock('../contexts/SettingsContext.js', () => ({
  useSettings: mockedUseSettings,
}));

describe('usePermissionsModifyTrust', () => {
  let mockOnExit: Mock;
  let mockAddItem: Mock;

  beforeEach(() => {
    mockAddItem = vi.fn();
    mockOnExit = vi.fn();

    mockedCwd.mockReturnValue('/test/dir');
    mockedUseSettings.mockReturnValue({
      merged: {
        security: {
          folderTrust: {
            enabled: true,
          },
        },
      },
    } as LoadedSettings);
    mockedIsWorkspaceTrusted.mockReturnValue({
      isTrusted: undefined,
      source: undefined,
    });
  });

  afterEach(() => {
    vi.resetAllMocks();
  });

  describe('when targetDirectory is the current workspace', () => {
    it('should initialize with the correct trust level', () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: { '/test/dir': TrustLevel.TRUST_FOLDER } },
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      expect(result.current.currentTrustLevel).toBe(TrustLevel.TRUST_FOLDER);
    });

    it('should detect inherited trust from parent', () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: vi.fn(),
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      expect(result.current.isInheritedTrustFromParent).toBe(true);
      expect(result.current.isInheritedTrustFromIde).toBe(false);
    });

    it('should detect inherited trust from IDE', () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} }, // No explicit trust
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'ide',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      expect(result.current.isInheritedTrustFromIde).toBe(true);
      expect(result.current.isInheritedTrustFromParent).toBe(false);
    });

    it('should set needsRestart but not save when trust changes', async () => {
      const mockSetValue = vi.fn();
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: mockSetValue,
      } as unknown as LoadedTrustedFolders);

      mockedIsWorkspaceTrusted
        .mockReturnValueOnce({ isTrusted: false, source: 'file' })
        .mockReturnValueOnce({ isTrusted: true, source: 'file' });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.TRUST_FOLDER);
      });

      expect(result.current.needsRestart).toBe(true);
      expect(mockSetValue).not.toHaveBeenCalled();
    });

    it('should save immediately if trust does not change', async () => {
      const mockSetValue = vi.fn();
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: mockSetValue,
      } as unknown as LoadedTrustedFolders);

      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.TRUST_PARENT);
      });

      expect(result.current.needsRestart).toBe(false);
      expect(mockSetValue).toHaveBeenCalledWith(
        '/test/dir',
        TrustLevel.TRUST_PARENT,
      );
      expect(mockOnExit).toHaveBeenCalled();
    });

    it('should commit the pending trust level change', async () => {
      const mockSetValue = vi.fn();
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: mockSetValue,
      } as unknown as LoadedTrustedFolders);

      mockedIsWorkspaceTrusted
        .mockReturnValueOnce({ isTrusted: false, source: 'file' })
        .mockReturnValueOnce({ isTrusted: true, source: 'file' });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.TRUST_FOLDER);
      });

      expect(result.current.needsRestart).toBe(true);

      await act(async () => {
        await result.current.commitTrustLevelChange();
      });

      expect(mockSetValue).toHaveBeenCalledWith(
        '/test/dir',
        TrustLevel.TRUST_FOLDER,
      );
    });

    it('should add warning when setting DO_NOT_TRUST but still trusted by parent', async () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: vi.fn(),
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.DO_NOT_TRUST);
      });

      expect(mockAddItem).toHaveBeenCalledWith(
        {
          type: 'warning',
          text: 'Note: This folder is still trusted because a parent folder is trusted.',
        },
        expect.any(Number),
      );
    });

    it('should add warning when setting DO_NOT_TRUST but still trusted by IDE', async () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: vi.fn(),
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'ide',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.DO_NOT_TRUST);
      });

      expect(mockAddItem).toHaveBeenCalledWith(
        {
          type: 'warning',
          text: 'Note: This folder is still trusted because the connected IDE workspace is trusted.',
        },
        expect.any(Number),
      );
    });
  });

  describe('when targetDirectory is not the current workspace', () => {
    const otherDirectory = '/other/dir';

    it('should not detect inherited trust', () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, otherDirectory),
      );

      expect(result.current.isInheritedTrustFromParent).toBe(false);
      expect(result.current.isInheritedTrustFromIde).toBe(false);
    });

    it('should save immediately without needing a restart', async () => {
      const mockSetValue = vi.fn();
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: mockSetValue,
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: false,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, otherDirectory),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.TRUST_FOLDER);
      });

      expect(result.current.needsRestart).toBe(false);
      expect(mockSetValue).toHaveBeenCalledWith(
        otherDirectory,
        TrustLevel.TRUST_FOLDER,
      );
      expect(mockOnExit).toHaveBeenCalled();
    });

    it('should not add a warning when setting DO_NOT_TRUST', async () => {
      mockedLoadTrustedFolders.mockReturnValue({
        user: { config: {} },
        setValue: vi.fn(),
      } as unknown as LoadedTrustedFolders);
      mockedIsWorkspaceTrusted.mockReturnValue({
        isTrusted: true,
        source: 'file',
      });

      const { result } = renderHook(() =>
        usePermissionsModifyTrust(mockOnExit, mockAddItem, otherDirectory),
      );

      await act(async () => {
        await result.current.updateTrustLevel(TrustLevel.DO_NOT_TRUST);
      });

      expect(mockAddItem).not.toHaveBeenCalled();
    });
  });

  it('should emit feedback when setValue throws in updateTrustLevel', async () => {
    const mockSetValue = vi.fn().mockImplementation(() => {
      throw new Error('test error');
    });
    mockedLoadTrustedFolders.mockReturnValue({
      user: { config: {} },
      setValue: mockSetValue,
    } as unknown as LoadedTrustedFolders);

    mockedIsWorkspaceTrusted.mockReturnValue({
      isTrusted: true,
      source: 'file',
    });

    const emitFeedbackSpy = vi.spyOn(coreEvents, 'emitFeedback');

    const { result } = renderHook(() =>
      usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
    );

    await act(async () => {
      await result.current.updateTrustLevel(TrustLevel.TRUST_PARENT);
    });

    expect(emitFeedbackSpy).toHaveBeenCalledWith(
      'error',
      'Failed to save trust settings. Your changes may not persist.',
    );
    expect(mockOnExit).toHaveBeenCalled();
  });

  it('should emit feedback when setValue throws in commitTrustLevelChange', async () => {
    const mockSetValue = vi.fn().mockImplementation(() => {
      throw new Error('test error');
    });
    mockedLoadTrustedFolders.mockReturnValue({
      user: { config: {} },
      setValue: mockSetValue,
    } as unknown as LoadedTrustedFolders);

    mockedIsWorkspaceTrusted
      .mockReturnValueOnce({ isTrusted: false, source: 'file' })
      .mockReturnValueOnce({ isTrusted: true, source: 'file' });

    const emitFeedbackSpy = vi.spyOn(coreEvents, 'emitFeedback');

    const { result } = renderHook(() =>
      usePermissionsModifyTrust(mockOnExit, mockAddItem, mockedCwd()),
    );

    await act(async () => {
      await result.current.updateTrustLevel(TrustLevel.TRUST_FOLDER);
    });

    await act(async () => {
      const success = await result.current.commitTrustLevelChange();
      expect(success).toBe(false);
    });

    expect(emitFeedbackSpy).toHaveBeenCalledWith(
      'error',
      'Failed to save trust settings. Your changes may not persist.',
    );
    expect(result.current.needsRestart).toBe(false);
  });
});