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

import { useCallback, useEffect, useMemo, useState, useRef } from 'react';
import {
  Box,
  DOMElement,
  measureElement,
  Static,
  Text,
  useStdin,
  useStdout,
} from 'ink';
import { StreamingState, type HistoryItem, MessageType } from './types.js';
import { useTerminalSize } from './hooks/useTerminalSize.js';
import { useGeminiStream } from './hooks/useGeminiStream.js';
import { useLoadingIndicator } from './hooks/useLoadingIndicator.js';
import { useThemeCommand } from './hooks/useThemeCommand.js';
import { useAuthCommand } from './hooks/useAuthCommand.js';
import { useQwenAuth } from './hooks/useQwenAuth.js';
import { useFolderTrust } from './hooks/useFolderTrust.js';
import { useEditorSettings } from './hooks/useEditorSettings.js';
import { useSlashCommandProcessor } from './hooks/slashCommandProcessor.js';
import { useSubagentCreateDialog } from './hooks/useSubagentCreateDialog.js';
import { useAgentsManagerDialog } from './hooks/useAgentsManagerDialog.js';
import { useAutoAcceptIndicator } from './hooks/useAutoAcceptIndicator.js';
import { useMessageQueue } from './hooks/useMessageQueue.js';
import { useConsoleMessages } from './hooks/useConsoleMessages.js';
import { Header } from './components/Header.js';
import { LoadingIndicator } from './components/LoadingIndicator.js';
import { AutoAcceptIndicator } from './components/AutoAcceptIndicator.js';
import { ShellModeIndicator } from './components/ShellModeIndicator.js';
import { InputPrompt } from './components/InputPrompt.js';
import { Footer } from './components/Footer.js';
import { ThemeDialog } from './components/ThemeDialog.js';
import { AuthDialog } from './components/AuthDialog.js';
import { AuthInProgress } from './components/AuthInProgress.js';
import { QwenOAuthProgress } from './components/QwenOAuthProgress.js';
import { EditorSettingsDialog } from './components/EditorSettingsDialog.js';
import { FolderTrustDialog } from './components/FolderTrustDialog.js';
import { ShellConfirmationDialog } from './components/ShellConfirmationDialog.js';
import { RadioButtonSelect } from './components/shared/RadioButtonSelect.js';
import {
  AgentCreationWizard,
  AgentsManagerDialog,
} from './components/subagents/index.js';
import { Colors } from './colors.js';
import { loadHierarchicalGeminiMemory } from '../config/config.js';
import { LoadedSettings, SettingScope } from '../config/settings.js';
import { Tips } from './components/Tips.js';
import { ConsolePatcher } from './utils/ConsolePatcher.js';
import { registerCleanup } from '../utils/cleanup.js';
import { DetailedMessagesDisplay } from './components/DetailedMessagesDisplay.js';
import { HistoryItemDisplay } from './components/HistoryItemDisplay.js';
import { ContextSummaryDisplay } from './components/ContextSummaryDisplay.js';
import { useHistory } from './hooks/useHistoryManager.js';
import process from 'node:process';
import {
  getErrorMessage,
  type Config,
  getAllGeminiMdFilenames,
  ApprovalMode,
  isEditorAvailable,
  EditorType,
  FlashFallbackEvent,
  logFlashFallback,
  AuthType,
  type IdeContext,
  ideContext,
} from '@qwen-code/qwen-code-core';
import {
  IdeIntegrationNudge,
  IdeIntegrationNudgeResult,
} from './IdeIntegrationNudge.js';
import { validateAuthMethod } from '../config/auth.js';
import { useLogger } from './hooks/useLogger.js';
import { StreamingContext } from './contexts/StreamingContext.js';
import {
  SessionStatsProvider,
  useSessionStats,
} from './contexts/SessionContext.js';
import { useGitBranchName } from './hooks/useGitBranchName.js';
import { useFocus } from './hooks/useFocus.js';
import { useBracketedPaste } from './hooks/useBracketedPaste.js';
import { useTextBuffer } from './components/shared/text-buffer.js';
import { useVimMode, VimModeProvider } from './contexts/VimModeContext.js';
import { useVim } from './hooks/vim.js';
import { useKeypress, Key } from './hooks/useKeypress.js';
import { KeypressProvider } from './contexts/KeypressContext.js';
import { useKittyKeyboardProtocol } from './hooks/useKittyKeyboardProtocol.js';
import { keyMatchers, Command } from './keyMatchers.js';
import * as fs from 'fs';
import { UpdateNotification } from './components/UpdateNotification.js';
import {
  isProQuotaExceededError,
  isGenericQuotaExceededError,
  UserTierId,
} from '@qwen-code/qwen-code-core';
import { UpdateObject } from './utils/updateCheck.js';
import ansiEscapes from 'ansi-escapes';
import { OverflowProvider } from './contexts/OverflowContext.js';
import { ShowMoreLines } from './components/ShowMoreLines.js';
import { PrivacyNotice } from './privacy/PrivacyNotice.js';
import { useSettingsCommand } from './hooks/useSettingsCommand.js';
import { SettingsDialog } from './components/SettingsDialog.js';
import { setUpdateHandler } from '../utils/handleAutoUpdate.js';
import { appEvents, AppEvent } from '../utils/events.js';
import { isNarrowWidth } from './utils/isNarrowWidth.js';

const CTRL_EXIT_PROMPT_DURATION_MS = 1000;
// Maximum number of queued messages to display in UI to prevent performance issues
const MAX_DISPLAYED_QUEUED_MESSAGES = 3;

interface AppProps {
  config: Config;
  settings: LoadedSettings;
  startupWarnings?: string[];
  version: string;
}

export const AppWrapper = (props: AppProps) => {
  const kittyProtocolStatus = useKittyKeyboardProtocol();
  return (
    <KeypressProvider
      kittyProtocolEnabled={kittyProtocolStatus.enabled}
      config={props.config}
    >
      <SessionStatsProvider>
        <VimModeProvider settings={props.settings}>
          <App {...props} />
        </VimModeProvider>
      </SessionStatsProvider>
    </KeypressProvider>
  );
};

const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
  const isFocused = useFocus();
  useBracketedPaste();
  const [updateInfo, setUpdateInfo] = useState<UpdateObject | null>(null);
  const { stdout } = useStdout();
  const nightly = version.includes('nightly');
  const { history, addItem, clearItems, loadHistory } = useHistory();

  const [idePromptAnswered, setIdePromptAnswered] = useState(false);
  const currentIDE = config.getIdeClient().getCurrentIde();
  useEffect(() => {
    registerCleanup(() => config.getIdeClient().disconnect());
  }, [config]);
  const shouldShowIdePrompt =
    currentIDE &&
    !config.getIdeMode() &&
    !settings.merged.hasSeenIdeIntegrationNudge &&
    !idePromptAnswered;

  useEffect(() => {
    const cleanup = setUpdateHandler(addItem, setUpdateInfo);
    return cleanup;
  }, [addItem]);

  const {
    consoleMessages,
    handleNewMessage,
    clearConsoleMessages: clearConsoleMessagesState,
  } = useConsoleMessages();

  useEffect(() => {
    const consolePatcher = new ConsolePatcher({
      onNewMessage: handleNewMessage,
      debugMode: config.getDebugMode(),
    });
    consolePatcher.patch();
    registerCleanup(consolePatcher.cleanup);
  }, [handleNewMessage, config]);

  const { stats: sessionStats } = useSessionStats();
  const [staticNeedsRefresh, setStaticNeedsRefresh] = useState(false);
  const [staticKey, setStaticKey] = useState(0);
  const refreshStatic = useCallback(() => {
    stdout.write(ansiEscapes.clearTerminal);
    setStaticKey((prev) => prev + 1);
  }, [setStaticKey, stdout]);

  const [geminiMdFileCount, setGeminiMdFileCount] = useState<number>(0);
  const [debugMessage, setDebugMessage] = useState<string>('');
  const [themeError, setThemeError] = useState<string | null>(null);
  const [authError, setAuthError] = useState<string | null>(null);
  const [editorError, setEditorError] = useState<string | null>(null);
  const [footerHeight, setFooterHeight] = useState<number>(0);
  const [corgiMode, setCorgiMode] = useState(false);
  const [isTrustedFolderState, setIsTrustedFolder] = useState(
    config.isTrustedFolder(),
  );
  const [currentModel, setCurrentModel] = useState(config.getModel());
  const [shellModeActive, setShellModeActive] = useState(false);
  const [showErrorDetails, setShowErrorDetails] = useState<boolean>(false);
  const [showToolDescriptions, setShowToolDescriptions] =
    useState<boolean>(false);

  const [ctrlCPressedOnce, setCtrlCPressedOnce] = useState(false);
  const [quittingMessages, setQuittingMessages] = useState<
    HistoryItem[] | null
  >(null);
  const ctrlCTimerRef = useRef<NodeJS.Timeout | null>(null);
  const [ctrlDPressedOnce, setCtrlDPressedOnce] = useState(false);
  const ctrlDTimerRef = useRef<NodeJS.Timeout | null>(null);
  const [constrainHeight, setConstrainHeight] = useState<boolean>(true);
  const [showPrivacyNotice, setShowPrivacyNotice] = useState<boolean>(false);
  const [modelSwitchedFromQuotaError, setModelSwitchedFromQuotaError] =
    useState<boolean>(false);
  const [userTier, setUserTier] = useState<UserTierId | undefined>(undefined);
  const [ideContextState, setIdeContextState] = useState<
    IdeContext | undefined
  >();
  const [showEscapePrompt, setShowEscapePrompt] = useState(false);
  const [isProcessing, setIsProcessing] = useState<boolean>(false);

  useEffect(() => {
    const unsubscribe = ideContext.subscribeToIdeContext(setIdeContextState);
    // Set the initial value
    setIdeContextState(ideContext.getIdeContext());
    return unsubscribe;
  }, []);

  useEffect(() => {
    const openDebugConsole = () => {
      setShowErrorDetails(true);
      setConstrainHeight(false); // Make sure the user sees the full message.
    };
    appEvents.on(AppEvent.OpenDebugConsole, openDebugConsole);

    const logErrorHandler = (errorMessage: unknown) => {
      handleNewMessage({
        type: 'error',
        content: String(errorMessage),
        count: 1,
      });
    };
    appEvents.on(AppEvent.LogError, logErrorHandler);

    return () => {
      appEvents.off(AppEvent.OpenDebugConsole, openDebugConsole);
      appEvents.off(AppEvent.LogError, logErrorHandler);
    };
  }, [handleNewMessage]);

  const openPrivacyNotice = useCallback(() => {
    setShowPrivacyNotice(true);
  }, []);

  const handleEscapePromptChange = useCallback((showPrompt: boolean) => {
    setShowEscapePrompt(showPrompt);
  }, []);

  const initialPromptSubmitted = useRef(false);

  const errorCount = useMemo(
    () =>
      consoleMessages
        .filter((msg) => msg.type === 'error')
        .reduce((total, msg) => total + msg.count, 0),
    [consoleMessages],
  );

  const {
    isThemeDialogOpen,
    openThemeDialog,
    handleThemeSelect,
    handleThemeHighlight,
  } = useThemeCommand(settings, setThemeError, addItem);

  const { isSettingsDialogOpen, openSettingsDialog, closeSettingsDialog } =
    useSettingsCommand();

  const {
    isSubagentCreateDialogOpen,
    openSubagentCreateDialog,
    closeSubagentCreateDialog,
  } = useSubagentCreateDialog();

  const {
    isAgentsManagerDialogOpen,
    openAgentsManagerDialog,
    closeAgentsManagerDialog,
  } = useAgentsManagerDialog();

  const { isFolderTrustDialogOpen, handleFolderTrustSelect } = useFolderTrust(
    settings,
    setIsTrustedFolder,
  );

  const {
    isAuthDialogOpen,
    openAuthDialog,
    handleAuthSelect,
    isAuthenticating,
    cancelAuthentication,
  } = useAuthCommand(settings, setAuthError, config);

  const {
    isQwenAuthenticating,
    deviceAuth,
    isQwenAuth,
    cancelQwenAuth,
    authStatus,
    authMessage,
  } = useQwenAuth(settings, isAuthenticating);

  useEffect(() => {
    if (settings.merged.selectedAuthType && !settings.merged.useExternalAuth) {
      const error = validateAuthMethod(settings.merged.selectedAuthType);
      if (error) {
        setAuthError(error);
        openAuthDialog();
      }
    }
  }, [
    settings.merged.selectedAuthType,
    settings.merged.useExternalAuth,
    openAuthDialog,
    setAuthError,
  ]);

  // Sync user tier from config when authentication changes
  useEffect(() => {
    // Only sync when not currently authenticating
    if (!isAuthenticating) {
      setUserTier(config.getGeminiClient()?.getUserTier());
    }
  }, [config, isAuthenticating]);

  // Handle Qwen OAuth timeout
  useEffect(() => {
    if (isQwenAuth && authStatus === 'timeout') {
      setAuthError(
        authMessage ||
          'Qwen OAuth authentication timed out. Please try again or select a different authentication method.',
      );
      cancelQwenAuth();
      cancelAuthentication();
      openAuthDialog();
    }
  }, [
    isQwenAuth,
    authStatus,
    authMessage,
    cancelQwenAuth,
    cancelAuthentication,
    openAuthDialog,
    setAuthError,
  ]);

  const {
    isEditorDialogOpen,
    openEditorDialog,
    handleEditorSelect,
    exitEditorDialog,
  } = useEditorSettings(settings, setEditorError, addItem);

  const toggleCorgiMode = useCallback(() => {
    setCorgiMode((prev) => !prev);
  }, []);

  const performMemoryRefresh = useCallback(async () => {
    addItem(
      {
        type: MessageType.INFO,
        text: 'Refreshing hierarchical memory (QWEN.md or other context files)...',
      },
      Date.now(),
    );
    try {
      const { memoryContent, fileCount } = await loadHierarchicalGeminiMemory(
        process.cwd(),
        settings.merged.loadMemoryFromIncludeDirectories
          ? config.getWorkspaceContext().getDirectories()
          : [],
        config.getDebugMode(),
        config.getFileService(),
        settings.merged,
        config.getExtensionContextFilePaths(),
        settings.merged.memoryImportFormat || 'tree', // Use setting or default to 'tree'
        config.getFileFilteringOptions(),
      );

      config.setUserMemory(memoryContent);
      config.setGeminiMdFileCount(fileCount);
      setGeminiMdFileCount(fileCount);

      addItem(
        {
          type: MessageType.INFO,
          text: `Memory refreshed successfully. ${memoryContent.length > 0 ? `Loaded ${memoryContent.length} characters from ${fileCount} file(s).` : 'No memory content found.'}`,
        },
        Date.now(),
      );
      if (config.getDebugMode()) {
        console.log(
          `[DEBUG] Refreshed memory content in config: ${memoryContent.substring(0, 200)}...`,
        );
      }
    } catch (error) {
      const errorMessage = getErrorMessage(error);
      addItem(
        {
          type: MessageType.ERROR,
          text: `Error refreshing memory: ${errorMessage}`,
        },
        Date.now(),
      );
      console.error('Error refreshing memory:', error);
    }
  }, [config, addItem, settings.merged]);

  // Watch for model changes (e.g., from Flash fallback)
  useEffect(() => {
    const checkModelChange = () => {
      const configModel = config.getModel();
      if (configModel !== currentModel) {
        setCurrentModel(configModel);
      }
    };

    // Check immediately and then periodically
    checkModelChange();
    const interval = setInterval(checkModelChange, 1000); // Check every second

    return () => clearInterval(interval);
  }, [config, currentModel]);

  // Set up Flash fallback handler
  useEffect(() => {
    const flashFallbackHandler = async (
      currentModel: string,
      fallbackModel: string,
      error?: unknown,
    ): Promise<boolean> => {
      let message: string;

      if (
        config.getContentGeneratorConfig().authType ===
        AuthType.LOGIN_WITH_GOOGLE
      ) {
        // Use actual user tier if available; otherwise, default to FREE tier behavior (safe default)
        const isPaidTier =
          userTier === UserTierId.LEGACY || userTier === UserTierId.STANDARD;

        // Check if this is a Pro quota exceeded error
        if (error && isProQuotaExceededError(error)) {
          if (isPaidTier) {
            message = `⚡ You have reached your daily ${currentModel} quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            message = `⚡ You have reached your daily ${currentModel} quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To increase your limits, upgrade to a Gemini Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-gemini-code-assist
⚡ Or you can utilize a Gemini API Key. See: https://goo.gle/gemini-cli-docs-auth#gemini-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        } else if (error && isGenericQuotaExceededError(error)) {
          if (isPaidTier) {
            message = `⚡ You have reached your daily quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            message = `⚡ You have reached your daily quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To increase your limits, upgrade to a Gemini Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-gemini-code-assist
⚡ Or you can utilize a Gemini API Key. See: https://goo.gle/gemini-cli-docs-auth#gemini-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        } else {
          if (isPaidTier) {
            // Default fallback message for other cases (like consecutive 429s)
            message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.
⚡ Possible reasons for this are that you have received multiple consecutive capacity errors or you have reached your daily ${currentModel} quota limit
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            // Default fallback message for other cases (like consecutive 429s)
            message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.
⚡ Possible reasons for this are that you have received multiple consecutive capacity errors or you have reached your daily ${currentModel} quota limit
⚡ To increase your limits, upgrade to a Gemini Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-gemini-code-assist
⚡ Or you can utilize a Gemini API Key. See: https://goo.gle/gemini-cli-docs-auth#gemini-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        }

        // Add message to UI history
        addItem(
          {
            type: MessageType.INFO,
            text: message,
          },
          Date.now(),
        );

        // Set the flag to prevent tool continuation
        setModelSwitchedFromQuotaError(true);
        // Set global quota error flag to prevent Flash model calls
        config.setQuotaErrorOccurred(true);
      }

      // Switch model for future use but return false to stop current retry
      config.setModel(fallbackModel);
      config.setFallbackMode(true);
      logFlashFallback(
        config,
        new FlashFallbackEvent(config.getContentGeneratorConfig().authType!),
      );
      return false; // Don't continue with current prompt
    };

    config.setFlashFallbackHandler(flashFallbackHandler);
  }, [config, addItem, userTier]);

  // Terminal and UI setup
  const { rows: terminalHeight, columns: terminalWidth } = useTerminalSize();
  const isNarrow = isNarrowWidth(terminalWidth);
  const { stdin, setRawMode } = useStdin();
  const isInitialMount = useRef(true);

  const widthFraction = 0.9;
  const inputWidth = Math.max(
    20,
    Math.floor(terminalWidth * widthFraction) - 3,
  );
  const suggestionsWidth = Math.max(20, Math.floor(terminalWidth * 0.8));

  // Utility callbacks
  const isValidPath = useCallback((filePath: string): boolean => {
    try {
      return fs.existsSync(filePath) && fs.statSync(filePath).isFile();
    } catch (_e) {
      return false;
    }
  }, []);

  const getPreferredEditor = useCallback(() => {
    const editorType = settings.merged.preferredEditor;
    const isValidEditor = isEditorAvailable(editorType);
    if (!isValidEditor) {
      openEditorDialog();
      return;
    }
    return editorType as EditorType;
  }, [settings, openEditorDialog]);

  const onAuthError = useCallback(() => {
    setAuthError('reauth required');
    openAuthDialog();
  }, [openAuthDialog, setAuthError]);

  // Core hooks and processors
  const {
    vimEnabled: vimModeEnabled,
    vimMode,
    toggleVimEnabled,
  } = useVimMode();

  const {
    handleSlashCommand,
    slashCommands,
    pendingHistoryItems: pendingSlashCommandHistoryItems,
    commandContext,
    shellConfirmationRequest,
    confirmationRequest,
  } = useSlashCommandProcessor(
    config,
    settings,
    addItem,
    clearItems,
    loadHistory,
    refreshStatic,
    setDebugMessage,
    openThemeDialog,
    openAuthDialog,
    openEditorDialog,
    toggleCorgiMode,
    setQuittingMessages,
    openPrivacyNotice,
    openSettingsDialog,
    openSubagentCreateDialog,
    openAgentsManagerDialog,
    toggleVimEnabled,
    setIsProcessing,
    setGeminiMdFileCount,
  );

  const buffer = useTextBuffer({
    initialText: '',
    viewport: { height: 10, width: inputWidth },
    stdin,
    setRawMode,
    isValidPath,
    shellModeActive,
  });

  const [userMessages, setUserMessages] = useState<string[]>([]);

  // Stable reference for cancel handler to avoid circular dependency
  const cancelHandlerRef = useRef<() => void>(() => {});

  const {
    streamingState,
    submitQuery,
    initError,
    pendingHistoryItems: pendingGeminiHistoryItems,
    thought,
    cancelOngoingRequest,
  } = useGeminiStream(
    config.getGeminiClient(),
    history,
    addItem,
    config,
    setDebugMessage,
    handleSlashCommand,
    shellModeActive,
    getPreferredEditor,
    onAuthError,
    performMemoryRefresh,
    modelSwitchedFromQuotaError,
    setModelSwitchedFromQuotaError,
    refreshStatic,
    () => cancelHandlerRef.current(),
  );

  // Message queue for handling input during streaming
  const { messageQueue, addMessage, clearQueue, getQueuedMessagesText } =
    useMessageQueue({
      streamingState,
      submitQuery,
    });

  // Update the cancel handler with message queue support
  cancelHandlerRef.current = useCallback(() => {
    const lastUserMessage = userMessages.at(-1);
    let textToSet = lastUserMessage || '';

    // Append queued messages if any exist
    const queuedText = getQueuedMessagesText();
    if (queuedText) {
      textToSet = textToSet ? `${textToSet}\n\n${queuedText}` : queuedText;
      clearQueue();
    }

    if (textToSet) {
      buffer.setText(textToSet);
    }
  }, [buffer, userMessages, getQueuedMessagesText, clearQueue]);

  // Input handling - queue messages for processing
  const handleFinalSubmit = useCallback(
    (submittedValue: string) => {
      addMessage(submittedValue);
    },
    [addMessage],
  );

  const handleIdePromptComplete = useCallback(
    (result: IdeIntegrationNudgeResult) => {
      if (result.userSelection === 'yes') {
        if (result.isExtensionPreInstalled) {
          handleSlashCommand('/ide enable');
        } else {
          handleSlashCommand('/ide install');
        }
        settings.setValue(
          SettingScope.User,
          'hasSeenIdeIntegrationNudge',
          true,
        );
      } else if (result.userSelection === 'dismiss') {
        settings.setValue(
          SettingScope.User,
          'hasSeenIdeIntegrationNudge',
          true,
        );
      }
      setIdePromptAnswered(true);
    },
    [handleSlashCommand, settings],
  );

  const { handleInput: vimHandleInput } = useVim(buffer, handleFinalSubmit);
  const pendingHistoryItems = [...pendingSlashCommandHistoryItems];
  pendingHistoryItems.push(...pendingGeminiHistoryItems);

  const { elapsedTime, currentLoadingPhrase } =
    useLoadingIndicator(streamingState);
  const showAutoAcceptIndicator = useAutoAcceptIndicator({ config });

  const handleExit = useCallback(
    (
      pressedOnce: boolean,
      setPressedOnce: (value: boolean) => void,
      timerRef: ReturnType<typeof useRef<NodeJS.Timeout | null>>,
    ) => {
      if (pressedOnce) {
        if (timerRef.current) {
          clearTimeout(timerRef.current);
        }
        // Directly invoke the central command handler.
        handleSlashCommand('/quit');
      } else {
        setPressedOnce(true);
        timerRef.current = setTimeout(() => {
          setPressedOnce(false);
          timerRef.current = null;
        }, CTRL_EXIT_PROMPT_DURATION_MS);
      }
    },
    [handleSlashCommand],
  );

  const handleGlobalKeypress = useCallback(
    (key: Key) => {
      let enteringConstrainHeightMode = false;
      if (!constrainHeight) {
        enteringConstrainHeightMode = true;
        setConstrainHeight(true);
      }

      if (keyMatchers[Command.SHOW_ERROR_DETAILS](key)) {
        setShowErrorDetails((prev) => !prev);
      } else if (keyMatchers[Command.TOGGLE_TOOL_DESCRIPTIONS](key)) {
        const newValue = !showToolDescriptions;
        setShowToolDescriptions(newValue);

        const mcpServers = config.getMcpServers();
        if (Object.keys(mcpServers || {}).length > 0) {
          handleSlashCommand(newValue ? '/mcp desc' : '/mcp nodesc');
        }
      } else if (
        keyMatchers[Command.TOGGLE_IDE_CONTEXT_DETAIL](key) &&
        config.getIdeMode() &&
        ideContextState
      ) {
        // Show IDE status when in IDE mode and context is available.
        handleSlashCommand('/ide status');
      } else if (keyMatchers[Command.QUIT](key)) {
        // When authenticating, let AuthInProgress component handle Ctrl+C.
        if (isAuthenticating) {
          return;
        }
        if (!ctrlCPressedOnce) {
          cancelOngoingRequest?.();
        }
        handleExit(ctrlCPressedOnce, setCtrlCPressedOnce, ctrlCTimerRef);
      } else if (keyMatchers[Command.EXIT](key)) {
        if (buffer.text.length > 0) {
          return;
        }
        handleExit(ctrlDPressedOnce, setCtrlDPressedOnce, ctrlDTimerRef);
      } else if (
        keyMatchers[Command.SHOW_MORE_LINES](key) &&
        !enteringConstrainHeightMode
      ) {
        setConstrainHeight(false);
      }
    },
    [
      constrainHeight,
      setConstrainHeight,
      setShowErrorDetails,
      showToolDescriptions,
      setShowToolDescriptions,
      config,
      ideContextState,
      handleExit,
      ctrlCPressedOnce,
      setCtrlCPressedOnce,
      ctrlCTimerRef,
      buffer.text.length,
      ctrlDPressedOnce,
      setCtrlDPressedOnce,
      ctrlDTimerRef,
      handleSlashCommand,
      isAuthenticating,
      cancelOngoingRequest,
    ],
  );

  useKeypress(handleGlobalKeypress, {
    isActive: true,
  });

  useEffect(() => {
    if (config) {
      setGeminiMdFileCount(config.getGeminiMdFileCount());
    }
  }, [config, config.getGeminiMdFileCount]);

  const logger = useLogger();

  useEffect(() => {
    const fetchUserMessages = async () => {
      const pastMessagesRaw = (await logger?.getPreviousUserMessages()) || []; // Newest first

      const currentSessionUserMessages = history
        .filter(
          (item): item is HistoryItem & { type: 'user'; text: string } =>
            item.type === 'user' &&
            typeof item.text === 'string' &&
            item.text.trim() !== '',
        )
        .map((item) => item.text)
        .reverse(); // Newest first, to match pastMessagesRaw sorting

      // Combine, with current session messages being more recent
      const combinedMessages = [
        ...currentSessionUserMessages,
        ...pastMessagesRaw,
      ];

      // Deduplicate consecutive identical messages from the combined list (still newest first)
      const deduplicatedMessages: string[] = [];
      if (combinedMessages.length > 0) {
        deduplicatedMessages.push(combinedMessages[0]); // Add the newest one unconditionally
        for (let i = 1; i < combinedMessages.length; i++) {
          if (combinedMessages[i] !== combinedMessages[i - 1]) {
            deduplicatedMessages.push(combinedMessages[i]);
          }
        }
      }
      // Reverse to oldest first for useInputHistory
      setUserMessages(deduplicatedMessages.reverse());
    };
    fetchUserMessages();
  }, [history, logger]);

  const isInputActive =
    (streamingState === StreamingState.Idle ||
      streamingState === StreamingState.Responding) &&
    !initError &&
    !isProcessing;

  const handleClearScreen = useCallback(() => {
    clearItems();
    clearConsoleMessagesState();
    console.clear();
    refreshStatic();
  }, [clearItems, clearConsoleMessagesState, refreshStatic]);

  const mainControlsRef = useRef<DOMElement>(null);
  const pendingHistoryItemRef = useRef<DOMElement>(null);

  useEffect(() => {
    if (mainControlsRef.current) {
      const fullFooterMeasurement = measureElement(mainControlsRef.current);
      setFooterHeight(fullFooterMeasurement.height);
    }
  }, [terminalHeight, consoleMessages, showErrorDetails]);

  const staticExtraHeight = /* margins and padding */ 3;
  const availableTerminalHeight = useMemo(
    () => terminalHeight - footerHeight - staticExtraHeight,
    [terminalHeight, footerHeight],
  );

  useEffect(() => {
    // skip refreshing Static during first mount
    if (isInitialMount.current) {
      isInitialMount.current = false;
      return;
    }

    // debounce so it doesn't fire up too often during resize
    const handler = setTimeout(() => {
      setStaticNeedsRefresh(false);
      refreshStatic();
    }, 300);

    return () => {
      clearTimeout(handler);
    };
  }, [terminalWidth, terminalHeight, refreshStatic]);

  useEffect(() => {
    if (streamingState === StreamingState.Idle && staticNeedsRefresh) {
      setStaticNeedsRefresh(false);
      refreshStatic();
    }
  }, [streamingState, refreshStatic, staticNeedsRefresh]);

  const filteredConsoleMessages = useMemo(() => {
    if (config.getDebugMode()) {
      return consoleMessages;
    }
    return consoleMessages.filter((msg) => msg.type !== 'debug');
  }, [consoleMessages, config]);

  const branchName = useGitBranchName(config.getTargetDir());

  const contextFileNames = useMemo(() => {
    const fromSettings = settings.merged.contextFileName;
    if (fromSettings) {
      return Array.isArray(fromSettings) ? fromSettings : [fromSettings];
    }
    return getAllGeminiMdFilenames();
  }, [settings.merged.contextFileName]);

  const initialPrompt = useMemo(() => config.getQuestion(), [config]);
  const geminiClient = config.getGeminiClient();

  useEffect(() => {
    if (
      initialPrompt &&
      !initialPromptSubmitted.current &&
      !isAuthenticating &&
      !isAuthDialogOpen &&
      !isThemeDialogOpen &&
      !isEditorDialogOpen &&
      !isSubagentCreateDialogOpen &&
      !showPrivacyNotice &&
      geminiClient?.isInitialized?.()
    ) {
      submitQuery(initialPrompt);
      initialPromptSubmitted.current = true;
    }
  }, [
    initialPrompt,
    submitQuery,
    isAuthenticating,
    isAuthDialogOpen,
    isThemeDialogOpen,
    isEditorDialogOpen,
    isSubagentCreateDialogOpen,
    showPrivacyNotice,
    geminiClient,
  ]);

  if (quittingMessages) {
    return (
      <Box flexDirection="column" marginBottom={1}>
        {quittingMessages.map((item) => (
          <HistoryItemDisplay
            key={item.id}
            availableTerminalHeight={
              constrainHeight ? availableTerminalHeight : undefined
            }
            terminalWidth={terminalWidth}
            item={item}
            isPending={false}
            config={config}
          />
        ))}
      </Box>
    );
  }

  const mainAreaWidth = Math.floor(terminalWidth * 0.9);
  const debugConsoleMaxHeight = Math.floor(Math.max(terminalHeight * 0.2, 5));
  // Arbitrary threshold to ensure that items in the static area are large
  // enough but not too large to make the terminal hard to use.
  const staticAreaMaxItemHeight = Math.max(terminalHeight * 4, 100);
  const placeholder = vimModeEnabled
    ? "  Press 'i' for INSERT mode and 'Esc' for NORMAL mode."
    : '  Type your message or @path/to/file';

  return (
    <StreamingContext.Provider value={streamingState}>
      <Box flexDirection="column" width="90%">
        {/*
         * The Static component is an Ink intrinsic in which there can only be 1 per application.
         * Because of this restriction we're hacking it slightly by having a 'header' item here to
         * ensure that it's statically rendered.
         *
         * Background on the Static Item: Anything in the Static component is written a single time
         * to the console. Think of it like doing a console.log and then never using ANSI codes to
         * clear that content ever again. Effectively it has a moving frame that every time new static
         * content is set it'll flush content to the terminal and move the area which it's "clearing"
         * down a notch. Without Static the area which gets erased and redrawn continuously grows.
         */}
        <Static
          key={staticKey}
          items={[
            <Box flexDirection="column" key="header">
              {!settings.merged.hideBanner && (
                <Header version={version} nightly={nightly} />
              )}
              {!settings.merged.hideTips && <Tips config={config} />}
            </Box>,
            ...history.map((h) => (
              <HistoryItemDisplay
                terminalWidth={mainAreaWidth}
                availableTerminalHeight={staticAreaMaxItemHeight}
                key={h.id}
                item={h}
                isPending={false}
                config={config}
                commands={slashCommands}
              />
            )),
          ]}
        >
          {(item) => item}
        </Static>
        <OverflowProvider>
          <Box ref={pendingHistoryItemRef} flexDirection="column">
            {pendingHistoryItems.map((item, i) => (
              <HistoryItemDisplay
                key={i}
                availableTerminalHeight={
                  constrainHeight ? availableTerminalHeight : undefined
                }
                terminalWidth={mainAreaWidth}
                // TODO(taehykim): It seems like references to ids aren't necessary in
                // HistoryItemDisplay. Refactor later. Use a fake id for now.
                item={{ ...item, id: 0 }}
                isPending={true}
                config={config}
                isFocused={!isEditorDialogOpen}
              />
            ))}
            <ShowMoreLines constrainHeight={constrainHeight} />
          </Box>
        </OverflowProvider>

        <Box flexDirection="column" ref={mainControlsRef}>
          {/* Move UpdateNotification to render update notification above input area */}
          {updateInfo && <UpdateNotification message={updateInfo.message} />}
          {startupWarnings.length > 0 && (
            <Box
              borderStyle="round"
              borderColor={Colors.AccentYellow}
              paddingX={1}
              marginY={1}
              flexDirection="column"
            >
              {startupWarnings.map((warning, index) => (
                <Text key={index} color={Colors.AccentYellow}>
                  {warning}
                </Text>
              ))}
            </Box>
          )}

          {shouldShowIdePrompt && currentIDE ? (
            <IdeIntegrationNudge
              ide={currentIDE}
              onComplete={handleIdePromptComplete}
            />
          ) : isFolderTrustDialogOpen ? (
            <FolderTrustDialog onSelect={handleFolderTrustSelect} />
          ) : shellConfirmationRequest ? (
            <ShellConfirmationDialog request={shellConfirmationRequest} />
          ) : confirmationRequest ? (
            <Box flexDirection="column">
              {confirmationRequest.prompt}
              <Box paddingY={1}>
                <RadioButtonSelect
                  isFocused={!!confirmationRequest}
                  items={[
                    { label: 'Yes', value: true },
                    { label: 'No', value: false },
                  ]}
                  onSelect={(value: boolean) => {
                    confirmationRequest.onConfirm(value);
                  }}
                />
              </Box>
            </Box>
          ) : isThemeDialogOpen ? (
            <Box flexDirection="column">
              {themeError && (
                <Box marginBottom={1}>
                  <Text color={Colors.AccentRed}>{themeError}</Text>
                </Box>
              )}
              <ThemeDialog
                onSelect={handleThemeSelect}
                onHighlight={handleThemeHighlight}
                settings={settings}
                availableTerminalHeight={
                  constrainHeight
                    ? terminalHeight - staticExtraHeight
                    : undefined
                }
                terminalWidth={mainAreaWidth}
              />
            </Box>
          ) : isSettingsDialogOpen ? (
            <Box flexDirection="column">
              <SettingsDialog
                settings={settings}
                onSelect={() => closeSettingsDialog()}
                onRestartRequest={() => process.exit(0)}
              />
            </Box>
          ) : isSubagentCreateDialogOpen ? (
            <Box flexDirection="column">
              <AgentCreationWizard
                onClose={closeSubagentCreateDialog}
                config={config}
              />
            </Box>
          ) : isAgentsManagerDialogOpen ? (
            <Box flexDirection="column">
              <AgentsManagerDialog
                onClose={closeAgentsManagerDialog}
                config={config}
              />
            </Box>
          ) : isAuthenticating ? (
            <>
              {isQwenAuth && isQwenAuthenticating ? (
                <QwenOAuthProgress
                  deviceAuth={deviceAuth || undefined}
                  authStatus={authStatus}
                  authMessage={authMessage}
                  onTimeout={() => {
                    setAuthError(
                      'Qwen OAuth authentication timed out. Please try again.',
                    );
                    cancelQwenAuth();
                    cancelAuthentication();
                    openAuthDialog();
                  }}
                  onCancel={() => {
                    setAuthError('Qwen OAuth authentication cancelled.');
                    cancelQwenAuth();
                    cancelAuthentication();
                    openAuthDialog();
                  }}
                />
              ) : (
                <AuthInProgress
                  onTimeout={() => {
                    setAuthError('Authentication timed out. Please try again.');
                    cancelAuthentication();
                    openAuthDialog();
                  }}
                />
              )}
              {showErrorDetails && (
                <OverflowProvider>
                  <Box flexDirection="column">
                    <DetailedMessagesDisplay
                      messages={filteredConsoleMessages}
                      maxHeight={
                        constrainHeight ? debugConsoleMaxHeight : undefined
                      }
                      width={inputWidth}
                    />
                    <ShowMoreLines constrainHeight={constrainHeight} />
                  </Box>
                </OverflowProvider>
              )}
            </>
          ) : isAuthDialogOpen ? (
            <Box flexDirection="column">
              <AuthDialog
                onSelect={handleAuthSelect}
                settings={settings}
                initialErrorMessage={authError}
              />
            </Box>
          ) : isEditorDialogOpen ? (
            <Box flexDirection="column">
              {editorError && (
                <Box marginBottom={1}>
                  <Text color={Colors.AccentRed}>{editorError}</Text>
                </Box>
              )}
              <EditorSettingsDialog
                onSelect={handleEditorSelect}
                settings={settings}
                onExit={exitEditorDialog}
              />
            </Box>
          ) : showPrivacyNotice ? (
            <PrivacyNotice
              onExit={() => setShowPrivacyNotice(false)}
              config={config}
            />
          ) : (
            <>
              <LoadingIndicator
                thought={
                  streamingState === StreamingState.WaitingForConfirmation ||
                  config.getAccessibility()?.disableLoadingPhrases
                    ? undefined
                    : thought
                }
                currentLoadingPhrase={
                  config.getAccessibility()?.disableLoadingPhrases
                    ? undefined
                    : currentLoadingPhrase
                }
                elapsedTime={elapsedTime}
              />

              {/* Display queued messages below loading indicator */}
              {messageQueue.length > 0 && (
                <Box flexDirection="column" marginTop={1}>
                  {messageQueue
                    .slice(0, MAX_DISPLAYED_QUEUED_MESSAGES)
                    .map((message, index) => {
                      // Ensure multi-line messages are collapsed for the preview.
                      // Replace all whitespace (including newlines) with a single space.
                      const preview = message.replace(/\s+/g, ' ');

                      return (
                        // Ensure the Box takes full width so truncation calculates correctly
                        <Box key={index} paddingLeft={2} width="100%">
                          {/* Use wrap="truncate" to ensure it fits the terminal width and doesn't wrap */}
                          <Text dimColor wrap="truncate">
                            {preview}
                          </Text>
                        </Box>
                      );
                    })}
                  {messageQueue.length > MAX_DISPLAYED_QUEUED_MESSAGES && (
                    <Box paddingLeft={2}>
                      <Text dimColor>
                        ... (+
                        {messageQueue.length -
                          MAX_DISPLAYED_QUEUED_MESSAGES}{' '}
                        more)
                      </Text>
                    </Box>
                  )}
                </Box>
              )}

              <Box
                marginTop={1}
                justifyContent="space-between"
                width="100%"
                flexDirection={isNarrow ? 'column' : 'row'}
                alignItems={isNarrow ? 'flex-start' : 'center'}
              >
                <Box>
                  {process.env['GEMINI_SYSTEM_MD'] && (
                    <Text color={Colors.AccentRed}>|⌐■_■| </Text>
                  )}
                  {ctrlCPressedOnce ? (
                    <Text color={Colors.AccentYellow}>
                      Press Ctrl+C again to exit.
                    </Text>
                  ) : ctrlDPressedOnce ? (
                    <Text color={Colors.AccentYellow}>
                      Press Ctrl+D again to exit.
                    </Text>
                  ) : showEscapePrompt ? (
                    <Text color={Colors.Gray}>Press Esc again to clear.</Text>
                  ) : (
                    <ContextSummaryDisplay
                      ideContext={ideContextState}
                      geminiMdFileCount={geminiMdFileCount}
                      contextFileNames={contextFileNames}
                      mcpServers={config.getMcpServers()}
                      blockedMcpServers={config.getBlockedMcpServers()}
                      showToolDescriptions={showToolDescriptions}
                    />
                  )}
                </Box>
                <Box paddingTop={isNarrow ? 1 : 0}>
                  {showAutoAcceptIndicator !== ApprovalMode.DEFAULT &&
                    !shellModeActive && (
                      <AutoAcceptIndicator
                        approvalMode={showAutoAcceptIndicator}
                      />
                    )}
                  {shellModeActive && <ShellModeIndicator />}
                </Box>
              </Box>

              {showErrorDetails && (
                <OverflowProvider>
                  <Box flexDirection="column">
                    <DetailedMessagesDisplay
                      messages={filteredConsoleMessages}
                      maxHeight={
                        constrainHeight ? debugConsoleMaxHeight : undefined
                      }
                      width={inputWidth}
                    />
                    <ShowMoreLines constrainHeight={constrainHeight} />
                  </Box>
                </OverflowProvider>
              )}

              {isInputActive && (
                <InputPrompt
                  buffer={buffer}
                  inputWidth={inputWidth}
                  suggestionsWidth={suggestionsWidth}
                  onSubmit={handleFinalSubmit}
                  userMessages={userMessages}
                  onClearScreen={handleClearScreen}
                  config={config}
                  slashCommands={slashCommands}
                  commandContext={commandContext}
                  shellModeActive={shellModeActive}
                  setShellModeActive={setShellModeActive}
                  onEscapePromptChange={handleEscapePromptChange}
                  focus={isFocused}
                  vimHandleInput={vimHandleInput}
                  placeholder={placeholder}
                />
              )}
            </>
          )}

          {initError && streamingState !== StreamingState.Responding && (
            <Box
              borderStyle="round"
              borderColor={Colors.AccentRed}
              paddingX={1}
              marginBottom={1}
            >
              {history.find(
                (item) =>
                  item.type === 'error' && item.text?.includes(initError),
              )?.text ? (
                <Text color={Colors.AccentRed}>
                  {
                    history.find(
                      (item) =>
                        item.type === 'error' && item.text?.includes(initError),
                    )?.text
                  }
                </Text>
              ) : (
                <>
                  <Text color={Colors.AccentRed}>
                    Initialization Error: {initError}
                  </Text>
                  <Text color={Colors.AccentRed}>
                    {' '}
                    Please check API key and configuration.
                  </Text>
                </>
              )}
            </Box>
          )}
          {!settings.merged.hideFooter && (
            <Footer
              model={currentModel}
              targetDir={config.getTargetDir()}
              debugMode={config.getDebugMode()}
              branchName={branchName}
              debugMessage={debugMessage}
              corgiMode={corgiMode}
              errorCount={errorCount}
              showErrorDetails={showErrorDetails}
              showMemoryUsage={
                config.getDebugMode() ||
                settings.merged.showMemoryUsage ||
                false
              }
              promptTokenCount={sessionStats.lastPromptTokenCount}
              nightly={nightly}
              vimMode={vimModeEnabled ? vimMode : undefined}
              isTrustedFolder={isTrustedFolderState}
            />
          )}
        </Box>
      </Box>
    </StreamingContext.Provider>
  );
};
