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

import {
  describe,
  it,
  expect,
  vi,
  beforeEach,
  afterEach,
  type Mock,
} from 'vitest';
import { render, cleanup } from 'ink-testing-library';
import { AppContainer } from './AppContainer.js';
import { type Config, makeFakeConfig } from '@google/gemini-cli-core';
import type { LoadedSettings } from '../config/settings.js';
import type { InitializationResult } from '../core/initializer.js';
import { useQuotaAndFallback } from './hooks/useQuotaAndFallback.js';
import { UIStateContext, type UIState } from './contexts/UIStateContext.js';
import {
  UIActionsContext,
  type UIActions,
} from './contexts/UIActionsContext.js';
import { useContext } from 'react';

// Helper component will read the context values provided by AppContainer
// so we can assert against them in our tests.
let capturedUIState: UIState;
let capturedUIActions: UIActions;
function TestContextConsumer() {
  capturedUIState = useContext(UIStateContext)!;
  capturedUIActions = useContext(UIActionsContext)!;
  return null;
}

vi.mock('./App.js', () => ({
  App: TestContextConsumer,
}));

vi.mock('ink', async (importOriginal) => {
  const original = await importOriginal<typeof import('ink')>();
  return {
    ...original,
    measureElement: vi.fn(),
  };
});

vi.mock('./hooks/useQuotaAndFallback.js');
vi.mock('./hooks/useHistoryManager.js');
vi.mock('./hooks/useThemeCommand.js');
vi.mock('./auth/useAuth.js');
vi.mock('./hooks/useEditorSettings.js');
vi.mock('./hooks/useSettingsCommand.js');
vi.mock('./hooks/slashCommandProcessor.js');
vi.mock('./hooks/useConsoleMessages.js');
vi.mock('./hooks/useTerminalSize.js', () => ({
  useTerminalSize: vi.fn(() => ({ columns: 80, rows: 24 })),
}));
vi.mock('./hooks/useGeminiStream.js');
vi.mock('./hooks/vim.js');
vi.mock('./hooks/useFocus.js');
vi.mock('./hooks/useBracketedPaste.js');
vi.mock('./hooks/useKeypress.js');
vi.mock('./hooks/useLoadingIndicator.js');
vi.mock('./hooks/useFolderTrust.js');
vi.mock('./hooks/useMessageQueue.js');
vi.mock('./hooks/useAutoAcceptIndicator.js');
vi.mock('./hooks/useWorkspaceMigration.js');
vi.mock('./hooks/useGitBranchName.js');
vi.mock('./contexts/VimModeContext.js');
vi.mock('./contexts/SessionContext.js');
vi.mock('./components/shared/text-buffer.js');
vi.mock('./hooks/useLogger.js');

// Mock external utilities
vi.mock('../utils/events.js');
vi.mock('../utils/handleAutoUpdate.js');
vi.mock('./utils/ConsolePatcher.js');
vi.mock('../utils/cleanup.js');

import { useHistory } from './hooks/useHistoryManager.js';
import { useThemeCommand } from './hooks/useThemeCommand.js';
import { useAuthCommand } from './auth/useAuth.js';
import { useEditorSettings } from './hooks/useEditorSettings.js';
import { useSettingsCommand } from './hooks/useSettingsCommand.js';
import { useSlashCommandProcessor } from './hooks/slashCommandProcessor.js';
import { useConsoleMessages } from './hooks/useConsoleMessages.js';
import { useGeminiStream } from './hooks/useGeminiStream.js';
import { useVim } from './hooks/vim.js';
import { useFolderTrust } from './hooks/useFolderTrust.js';
import { useMessageQueue } from './hooks/useMessageQueue.js';
import { useAutoAcceptIndicator } from './hooks/useAutoAcceptIndicator.js';
import { useWorkspaceMigration } from './hooks/useWorkspaceMigration.js';
import { useGitBranchName } from './hooks/useGitBranchName.js';
import { useVimMode } from './contexts/VimModeContext.js';
import { useSessionStats } from './contexts/SessionContext.js';
import { useTextBuffer } from './components/shared/text-buffer.js';
import { useLogger } from './hooks/useLogger.js';
import { useLoadingIndicator } from './hooks/useLoadingIndicator.js';
import { measureElement } from 'ink';
import { useTerminalSize } from './hooks/useTerminalSize.js';
import { ShellExecutionService } from '@google/gemini-cli-core';

describe('AppContainer State Management', () => {
  let mockConfig: Config;
  let mockSettings: LoadedSettings;
  let mockInitResult: InitializationResult;

  // Create typed mocks for all hooks
  const mockedUseQuotaAndFallback = useQuotaAndFallback as Mock;
  const mockedUseHistory = useHistory as Mock;
  const mockedUseThemeCommand = useThemeCommand as Mock;
  const mockedUseAuthCommand = useAuthCommand as Mock;
  const mockedUseEditorSettings = useEditorSettings as Mock;
  const mockedUseSettingsCommand = useSettingsCommand as Mock;
  const mockedUseSlashCommandProcessor = useSlashCommandProcessor as Mock;
  const mockedUseConsoleMessages = useConsoleMessages as Mock;
  const mockedUseGeminiStream = useGeminiStream as Mock;
  const mockedUseVim = useVim as Mock;
  const mockedUseFolderTrust = useFolderTrust as Mock;
  const mockedUseMessageQueue = useMessageQueue as Mock;
  const mockedUseAutoAcceptIndicator = useAutoAcceptIndicator as Mock;
  const mockedUseWorkspaceMigration = useWorkspaceMigration as Mock;
  const mockedUseGitBranchName = useGitBranchName as Mock;
  const mockedUseVimMode = useVimMode as Mock;
  const mockedUseSessionStats = useSessionStats as Mock;
  const mockedUseTextBuffer = useTextBuffer as Mock;
  const mockedUseLogger = useLogger as Mock;
  const mockedUseLoadingIndicator = useLoadingIndicator as Mock;

  beforeEach(() => {
    vi.clearAllMocks();

    capturedUIState = null!;
    capturedUIActions = null!;

    // **Provide a default return value for EVERY mocked hook.**
    mockedUseQuotaAndFallback.mockReturnValue({
      proQuotaRequest: null,
      handleProQuotaChoice: vi.fn(),
    });
    mockedUseHistory.mockReturnValue({
      history: [],
      addItem: vi.fn(),
      updateItem: vi.fn(),
      clearItems: vi.fn(),
      loadHistory: vi.fn(),
    });
    mockedUseThemeCommand.mockReturnValue({
      isThemeDialogOpen: false,
      openThemeDialog: vi.fn(),
      handleThemeSelect: vi.fn(),
      handleThemeHighlight: vi.fn(),
    });
    mockedUseAuthCommand.mockReturnValue({
      authState: 'authenticated',
      setAuthState: vi.fn(),
      authError: null,
      onAuthError: vi.fn(),
    });
    mockedUseEditorSettings.mockReturnValue({
      isEditorDialogOpen: false,
      openEditorDialog: vi.fn(),
      handleEditorSelect: vi.fn(),
      exitEditorDialog: vi.fn(),
    });
    mockedUseSettingsCommand.mockReturnValue({
      isSettingsDialogOpen: false,
      openSettingsDialog: vi.fn(),
      closeSettingsDialog: vi.fn(),
    });
    mockedUseSlashCommandProcessor.mockReturnValue({
      handleSlashCommand: vi.fn(),
      slashCommands: [],
      pendingHistoryItems: [],
      commandContext: {},
      shellConfirmationRequest: null,
      confirmationRequest: null,
    });
    mockedUseConsoleMessages.mockReturnValue({
      consoleMessages: [],
      handleNewMessage: vi.fn(),
      clearConsoleMessages: vi.fn(),
    });
    mockedUseGeminiStream.mockReturnValue({
      streamingState: 'idle',
      submitQuery: vi.fn(),
      initError: null,
      pendingHistoryItems: [],
      thought: null,
      cancelOngoingRequest: vi.fn(),
    });
    mockedUseVim.mockReturnValue({ handleInput: vi.fn() });
    mockedUseFolderTrust.mockReturnValue({
      isFolderTrustDialogOpen: false,
      handleFolderTrustSelect: vi.fn(),
      isRestarting: false,
    });
    mockedUseMessageQueue.mockReturnValue({
      messageQueue: [],
      addMessage: vi.fn(),
      clearQueue: vi.fn(),
      getQueuedMessagesText: vi.fn().mockReturnValue(''),
    });
    mockedUseAutoAcceptIndicator.mockReturnValue(false);
    mockedUseWorkspaceMigration.mockReturnValue({
      showWorkspaceMigrationDialog: false,
      workspaceExtensions: [],
      onWorkspaceMigrationDialogOpen: vi.fn(),
      onWorkspaceMigrationDialogClose: vi.fn(),
    });
    mockedUseGitBranchName.mockReturnValue('main');
    mockedUseVimMode.mockReturnValue({
      isVimEnabled: false,
      toggleVimEnabled: vi.fn(),
    });
    mockedUseSessionStats.mockReturnValue({ stats: {} });
    mockedUseTextBuffer.mockReturnValue({
      text: '',
      setText: vi.fn(),
      // Add other properties if AppContainer uses them
    });
    mockedUseLogger.mockReturnValue({
      getPreviousUserMessages: vi.fn().mockResolvedValue([]),
    });
    mockedUseLoadingIndicator.mockReturnValue({
      elapsedTime: '0.0s',
      currentLoadingPhrase: '',
    });

    // Mock Config
    mockConfig = makeFakeConfig();

    // Mock LoadedSettings
    mockSettings = {
      merged: {
        hideBanner: false,
        hideFooter: false,
        hideTips: false,
        showMemoryUsage: false,
        theme: 'default',
      },
    } as unknown as LoadedSettings;

    // Mock InitializationResult
    mockInitResult = {
      themeError: null,
      authError: null,
      shouldOpenAuthDialog: false,
      geminiMdFileCount: 0,
    } as InitializationResult;
  });

  afterEach(() => {
    cleanup();
  });

  describe('Basic Rendering', () => {
    it('renders without crashing with minimal props', () => {
      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });

    it('renders with startup warnings', () => {
      const startupWarnings = ['Warning 1', 'Warning 2'];

      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            startupWarnings={startupWarnings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });
  });

  describe('State Initialization', () => {
    it('initializes with theme error from initialization result', () => {
      const initResultWithError = {
        ...mockInitResult,
        themeError: 'Failed to load theme',
      };

      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={initResultWithError}
          />,
        );
      }).not.toThrow();
    });

    it('handles debug mode state', () => {
      const debugConfig = makeFakeConfig();
      vi.spyOn(debugConfig, 'getDebugMode').mockReturnValue(true);

      expect(() => {
        render(
          <AppContainer
            config={debugConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });
  });

  describe('Context Providers', () => {
    it('provides AppContext with correct values', () => {
      const { unmount } = render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="2.0.0"
          initializationResult={mockInitResult}
        />,
      );

      // Should render and unmount cleanly
      expect(() => unmount()).not.toThrow();
    });

    it('provides UIStateContext with state management', () => {
      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });

    it('provides UIActionsContext with action handlers', () => {
      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });

    it('provides ConfigContext with config object', () => {
      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });
  });

  describe('Settings Integration', () => {
    it('handles settings with all display options disabled', () => {
      const settingsAllHidden = {
        merged: {
          hideBanner: true,
          hideFooter: true,
          hideTips: true,
          showMemoryUsage: false,
        },
      } as unknown as LoadedSettings;

      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={settingsAllHidden}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });

    it('handles settings with memory usage enabled', () => {
      const settingsWithMemory = {
        merged: {
          hideBanner: false,
          hideFooter: false,
          hideTips: false,
          showMemoryUsage: true,
        },
      } as unknown as LoadedSettings;

      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={settingsWithMemory}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });
  });

  describe('Version Handling', () => {
    it.each(['1.0.0', '2.1.3-beta', '3.0.0-nightly'])(
      'handles version format: %s',
      (version) => {
        expect(() => {
          render(
            <AppContainer
              config={mockConfig}
              settings={mockSettings}
              version={version}
              initializationResult={mockInitResult}
            />,
          );
        }).not.toThrow();
      },
    );
  });

  describe('Error Handling', () => {
    it('handles config methods that might throw', () => {
      const errorConfig = makeFakeConfig();
      vi.spyOn(errorConfig, 'getModel').mockImplementation(() => {
        throw new Error('Config error');
      });

      // Should still render without crashing - errors should be handled internally
      expect(() => {
        render(
          <AppContainer
            config={errorConfig}
            settings={mockSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });

    it('handles undefined settings gracefully', () => {
      const undefinedSettings = {
        merged: {},
      } as LoadedSettings;

      expect(() => {
        render(
          <AppContainer
            config={mockConfig}
            settings={undefinedSettings}
            version="1.0.0"
            initializationResult={mockInitResult}
          />,
        );
      }).not.toThrow();
    });
  });

  describe('Provider Hierarchy', () => {
    it('establishes correct provider nesting order', () => {
      // This tests that all the context providers are properly nested
      // and that the component tree can be built without circular dependencies
      const { unmount } = render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="1.0.0"
          initializationResult={mockInitResult}
        />,
      );

      expect(() => unmount()).not.toThrow();
    });
  });

  describe('Quota and Fallback Integration', () => {
    it('passes a null proQuotaRequest to UIStateContext by default', () => {
      // The default mock from beforeEach already sets proQuotaRequest to null
      render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="1.0.0"
          initializationResult={mockInitResult}
        />,
      );

      // Assert that the context value is as expected
      expect(capturedUIState.proQuotaRequest).toBeNull();
    });

    it('passes a valid proQuotaRequest to UIStateContext when provided by the hook', () => {
      // Arrange: Create a mock request object that a UI dialog would receive
      const mockRequest = {
        failedModel: 'gemini-pro',
        fallbackModel: 'gemini-flash',
        resolve: vi.fn(),
      };
      mockedUseQuotaAndFallback.mockReturnValue({
        proQuotaRequest: mockRequest,
        handleProQuotaChoice: vi.fn(),
      });

      // Act: Render the container
      render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="1.0.0"
          initializationResult={mockInitResult}
        />,
      );

      // Assert: The mock request is correctly passed through the context
      expect(capturedUIState.proQuotaRequest).toEqual(mockRequest);
    });

    it('passes the handleProQuotaChoice function to UIActionsContext', () => {
      // Arrange: Create a mock handler function
      const mockHandler = vi.fn();
      mockedUseQuotaAndFallback.mockReturnValue({
        proQuotaRequest: null,
        handleProQuotaChoice: mockHandler,
      });

      // Act: Render the container
      render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="1.0.0"
          initializationResult={mockInitResult}
        />,
      );

      // Assert: The action in the context is the mock handler we provided
      expect(capturedUIActions.handleProQuotaChoice).toBe(mockHandler);

      // You can even verify that the plumbed function is callable
      capturedUIActions.handleProQuotaChoice('auth');
      expect(mockHandler).toHaveBeenCalledWith('auth');
    });
  });

  describe('Terminal Height Calculation', () => {
    const mockedMeasureElement = measureElement as Mock;
    const mockedUseTerminalSize = useTerminalSize as Mock;

    it('should prevent terminal height from being less than 1', () => {
      const resizePtySpy = vi.spyOn(ShellExecutionService, 'resizePty');
      // Arrange: Simulate a small terminal and a large footer
      mockedUseTerminalSize.mockReturnValue({ columns: 80, rows: 5 });
      mockedMeasureElement.mockReturnValue({ width: 80, height: 10 }); // Footer is taller than the screen
      mockedUseGeminiStream.mockReturnValue({
        streamingState: 'idle',
        submitQuery: vi.fn(),
        initError: null,
        pendingHistoryItems: [],
        thought: null,
        cancelOngoingRequest: vi.fn(),
        activePtyId: 'some-id',
      });

      render(
        <AppContainer
          config={mockConfig}
          settings={mockSettings}
          version="1.0.0"
          initializationResult={mockInitResult}
        />,
      );

      // Assert: The shell should be resized to a minimum height of 1, not a negative number.
      // The old code would have tried to set a negative height.
      expect(resizePtySpy).toHaveBeenCalled();
      const lastCall =
        resizePtySpy.mock.calls[resizePtySpy.mock.calls.length - 1];
      // Check the height argument specifically
      expect(lastCall[2]).toBe(1);
    });
  });
});