import { FC } from 'react';
import { HTMLInputTypeAttribute } from 'react';
import { ReactNode } from 'react';
import { RefObject } from 'react';
import { SVGProps } from 'react';

export declare const BackspaceIcon: FC<IconProps>;

export declare const CapsLockIcon: FC<IconProps>;

export declare interface ContinuousPressConfig {
    /** Delay before continuous press starts (ms) */
    initialDelay?: number;
    /** Interval between repeated presses (ms) */
    interval?: number;
}

export declare interface ContinuousPressOptions {
    initialDelay?: number;
    interval?: number;
    shouldPreventDefault?: boolean;
}

/**
 * Creates a caret manager for manipulating text in input elements.
 * This is a pure utility that doesn't use React hooks.
 *
 * @param getInputRef - Function that returns the current input element ref
 * @returns Object with insertText and backspace functions
 *
 * @example
 * ```tsx
 * const inputRef = useRef<HTMLInputElement>(null);
 * const { insertText, backspace } = createCaretManager(() => inputRef.current);
 * ```
 */
export declare function createCaretManager(getInputRef: () => InputElement | null): UseCaretManagerReturn;

export declare const DEFAULT_THEME: {
    readonly backgroundColor: "#1a1a1a";
    readonly keyColor: "#444444";
    readonly keyTextColor: "#ffffff";
    readonly keyActiveColor: "#666666";
    readonly keyHoverColor: "#555555";
    readonly activeStateColor: "#4a90e2";
    readonly keyBorderRadius: "0.5vw";
    readonly keyFontSize: "32px";
    readonly keyHeight: "100%";
};

export declare const EnterIcon: FC<IconProps>;

declare type FocusedInputRef = RefObject<HTMLInputElement | HTMLTextAreaElement | null>;

/**
 * Get the initial layout based on input type
 */
export declare const getInitialLayout: (inputType: HTMLInputTypeAttribute, defaultLayout: LayoutType) => LayoutType;

/**
 * GlobalVirtualKeyboard automatically shows a virtual keyboard when any
 * text input or textarea is focused. It handles:
 * - Automatic show/hide based on focus
 * - Scrolling inputs into view
 * - Form submission on Enter
 * - Input type detection for appropriate layouts
 *
 * @example
 * ```tsx
 * // Add once at the root of your app
 * function App() {
 *   return (
 *     <div>
 *       <YourAppContent />
 *       <GlobalVirtualKeyboard />
 *     </div>
 *   );
 * }
 * ```
 *
 * @example
 * ```tsx
 * // With controlled visibility
 * function App() {
 *   const [keyboardEnabled, setKeyboardEnabled] = useState(true);
 *
 *   return (
 *     <div>
 *       <button onClick={() => setKeyboardEnabled(!keyboardEnabled)}>
 *         Toggle Keyboard
 *       </button>
 *       <GlobalVirtualKeyboard enabled={keyboardEnabled} />
 *     </div>
 *   );
 * }
 * ```
 */
export declare const GlobalVirtualKeyboard: FC<GlobalVirtualKeyboardProps>;

export declare interface GlobalVirtualKeyboardProps {
    /**
     * Whether the virtual keyboard is enabled.
     * When false, the keyboard will not appear on input focus.
     * @default true
     */
    enabled?: boolean;
    /**
     * Additional CSS class name for the keyboard container
     */
    className?: string;
    /**
     * Callback fired when keyboard visibility changes
     */
    onVisibilityChange?: (isVisible: boolean) => void;
    /**
     * Callback fired when Enter key is pressed
     */
    onEnterClick?: () => void;
    /**
     * Callback fired when value changes
     */
    onChange?: (value: string) => void;
}

/**
 * Handle value change on the focused input
 */
export declare const handleValueChangeUtil: (focusedInputRef: FocusedInputRef, value: string) => void;

export declare interface HardwareKeyboardHandlers {
    isInputFocused: boolean;
    onBackspace: () => void;
    onEnter: () => void;
    onSpace: () => void;
    onCapsToggle: () => void;
    onKeyClick: (key: string) => void;
}

declare type IconProps = SVGProps<SVGSVGElement>;

export declare type InputElement = HTMLInputElement | HTMLTextAreaElement;

export declare const KeyboardLayout: FC<KeyboardLayoutProps>;

export declare interface KeyboardLayoutProps {
    currentLayout: LayoutType;
    capsLock: boolean;
    onKeyClick: (key: string) => void;
    onBackspace: () => void;
    onEnter: () => void;
    onSpace: () => void;
    onCapsToggle: () => void;
    onLayoutToggle: () => void;
    inputType?: HTMLInputTypeAttribute;
    customLayouts?: {
        letters?: string[][];
        symbols?: string[][];
        numbers?: string[][];
    };
}

export declare const KeyboardRow: FC<KeyboardRowProps>;

export declare interface KeyboardRowProps {
    children: ReactNode;
    className?: string;
}

export declare type LayoutType = 'letters' | 'symbols' | 'numbers';

export declare const NUMBERS_LAYOUT: readonly [readonly ["7", "8", "9", "#"], readonly ["4", "5", "6", "-"], readonly ["1", "2", "3"], readonly [",", "0", "."]];

export declare const NumbersLayout: FC<NumbersLayoutProps>;

export declare interface NumbersLayoutProps {
    currentLayoutData: ReadonlyArray<ReadonlyArray<string>> | string[][];
    onBackspace: () => void;
    onEnter: () => void;
    onKeyClick: (key: string) => void;
    capsLock: boolean;
    currentLayout: LayoutType;
}

/**
 * Handle Enter key click - blur input and submit form if applicable
 */
export declare const onEnterClickUtil: (focusedInputRef: FocusedInputRef) => void;

export declare const QWERTY_LAYOUT: readonly [readonly ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"], readonly ["q", "w", "e", "r", "t", "y", "u", "i", "o", "p"], readonly ["a", "s", "d", "f", "g", "h", "j", "k", "l"], readonly ["z", "x", "c", "v", "b", "n", "m"]];

/**
 * Reset scroll position by removing transforms from shifted elements
 */
export declare function resetScrollPosition(): void;

export declare interface ScrollConfig {
    /** Enable automatic scrolling when keyboard appears */
    enabled?: boolean;
    /** Additional offset padding (px) */
    offset?: number;
}

/**
 * Utility functions to handle layout shifting when virtual keyboard appears
 */
/**
 * Scroll the input into view by shifting content elements up
 */
export declare function scrollInputIntoView(input: HTMLInputElement | HTMLTextAreaElement, keyboardContainerRef: HTMLSpanElement): void;

/**
 * Update an input's value using the native setter (so React tracks it)
 * and dispatch bubbled, cancelable input/change events to notify listeners.
 */
export declare const setInputValueAndDispatchEvents: (input: InputElement, value: string, options?: {
    skipValueAssignment?: boolean;
}) => void;

/**
 * Sets up hardware keyboard event listeners to sync with virtual keyboard.
 * This is a pure utility that returns a cleanup function.
 *
 * @param handlers - Handlers for keyboard events
 * @returns Cleanup function to remove event listeners
 *
 * @example
 * ```tsx
 * useEffect(() => {
 *   if (!isInputFocused) return;
 *   return setupHardwareKeyboard({
 *     onBackspace: handleBackspace,
 *     onEnter: handleEnter,
 *     // ...
 *   });
 * }, [isInputFocused, handleBackspace, handleEnter]);
 * ```
 */
export declare function setupHardwareKeyboard(handlers: Omit<HardwareKeyboardHandlers, 'isInputFocused'>): () => void;

export declare const SpacebarIcon: FC<IconProps>;

export declare const SpecialKey: FC<SpecialKeyProps>;

export declare interface SpecialKeyProps {
    type: string;
    onClick: () => void;
    extraClass?: string;
    text?: string | null;
    icon?: ReactNode;
    capsLock?: boolean;
    enableContinuousPress?: boolean;
}

export declare const SYMBOLS_LAYOUT: readonly [readonly ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"], readonly ["!", "@", "#", "$", "%", "^", "&", "*", "(", ")"], readonly ["-", "_", "=", "+", "[", "]", "{", "}", "\\", "|"], readonly [";", ":", "\"", "'", ",", ".", "<", ">", "/", "?"]];

export declare const TextLayout: FC<TextLayoutProps>;

export declare interface TextLayoutProps {
    inputType?: HTMLInputTypeAttribute;
    currentLayoutData: ReadonlyArray<ReadonlyArray<string>> | string[][];
    onBackspace: () => void;
    onEnter: () => void;
    onSpace: () => void;
    onCapsToggle: () => void;
    onLayoutToggle: () => void;
    onKeyClick: (key: string) => void;
    capsLock: boolean;
    currentLayout: LayoutType;
}

export declare interface UseCaretManagerReturn {
    insertText: (text: string) => void;
    backspace: () => void;
}

/**
 * Hook for handling continuous press events (like holding backspace to delete multiple characters)
 */
export declare function useContinuousPress(onPress: () => void, { initialDelay, interval, shouldPreventDefault, }?: ContinuousPressOptions): {
    onMouseDown: (e: React.MouseEvent) => void;
    onTouchStart: (e: React.TouchEvent) => void;
    onMouseUp: () => void;
    onMouseLeave: () => void;
    onTouchEnd: (e: React.TouchEvent) => void;
};

/**
 * Hook to handle keyboard scrolling for input elements.
 * Automatically shifts content up when the virtual keyboard would cover the input.
 *
 * @returns Object with scroll and reset functions
 *
 * @example
 * ```tsx
 * const { scrollInput, resetScroll } = useKeyboardScroll();
 *
 * // When input is focused
 * scrollInput(inputElement);
 *
 * // When keyboard is hidden
 * resetScroll();
 * ```
 */
export declare function useKeyboardScroll(keyboardContainerRef: RefObject<HTMLSpanElement | null>): UseKeyboardScrollReturn;

export declare interface UseKeyboardScrollReturn {
    /** Scroll the input into view when keyboard appears */
    scrollInput: (input: HTMLInputElement | HTMLTextAreaElement) => void;
    /** Reset scroll position when keyboard hides */
    resetScroll: () => void;
}

/**
 * Validate if the focused element should show the virtual keyboard
 * Returns the input/textarea element or null if it shouldn't show keyboard
 */
export declare const validateFocusInputs: (event: Event) => HTMLInputElement | HTMLTextAreaElement | null;

/**
 * Validates a single character based on input type
 */
export declare const validateValueUtil: (value: string, inputType: HTMLInputTypeAttribute) => boolean;

export declare const VirtualKey: FC<VirtualKeyProps>;

/**
 * Virtual Keyboard Component
 *
 * A customizable on-screen keyboard for React applications.
 * Supports multiple layouts (QWERTY, symbols, numbers), hardware keyboard sync,
 * and touch device compatibility.
 */
export declare const VirtualKeyboard: FC<VirtualKeyboardProps>;

export declare const VirtualKeyboardContainer: FC<VirtualKeyboardContainerProps>;

declare interface VirtualKeyboardContainerProps {
    children: ReactNode;
    className?: string;
}

export declare interface VirtualKeyboardProps {
    /** Ref to the currently focused input element */
    focusedInputRef: RefObject<HTMLInputElement | HTMLTextAreaElement | null>;
    /** Whether an input is currently focused */
    isInputFocused: boolean;
    /** Type of the input element (affects layout and validation) */
    inputType?: HTMLInputTypeAttribute;
    /** Callback fired when Enter key is pressed */
    onEnterClick?: () => void;
    /** Callback fired when value changes */
    onChange?: (value: string) => void;
    /** Additional CSS class name */
    className?: string;
    /** Default layout to show ('letters' | 'symbols' | 'numbers') */
    defaultLayout?: LayoutType;
    /** Custom validation function */
    validate?: (value: string) => boolean;
    /** Theme configuration */
    theme?: VirtualKeyboardTheme;
    /** Custom keyboard layouts (overrides default layouts) */
    customLayouts?: {
        letters?: string[][];
        symbols?: string[][];
        numbers?: string[][];
    };
    /** Continuous press configuration for backspace */
    continuousPressConfig?: ContinuousPressConfig;
    /** Scroll behavior configuration */
    scrollConfig?: ScrollConfig;
    /** Enable/disable hardware keyboard synchronization */
    syncWithHardwareKeyboard?: boolean;
    /** Custom key labels (e.g., { 'enter': 'Submit', 'space': 'Space Bar' }) */
    keyLabels?: Record<string, string>;
    /** Keys to hide from the keyboard */
    hiddenKeys?: string[];
    /** Keys to disable (grayed out and non-clickable) */
    disabledKeys?: string[];
    /** Custom render function for individual keys */
    renderKey?: (key: string, defaultRender: ReactNode) => ReactNode;
    /** Custom render function for special keys */
    renderSpecialKey?: (type: string, defaultRender: ReactNode) => ReactNode;
    /** Multi-language keyboard layouts */
    languages?: {
        [languageCode: string]: {
            letters?: string[][];
            symbols?: string[][];
            numbers?: string[][];
            label?: string;
        };
    };
    /** Currently selected language code */
    currentLanguage?: string;
    /** Callback when language changes */
    onLanguageChange?: (languageCode: string) => void;
    /** Show language switcher button */
    showLanguageSwitcher?: boolean;
}

export declare interface VirtualKeyboardTheme {
    /** Background color of the keyboard container */
    backgroundColor?: string;
    /** Color of the keys */
    keyColor?: string;
    /** Text color on keys */
    keyTextColor?: string;
    /** Active/pressed key background color */
    keyActiveColor?: string;
    /** Hover key background color */
    keyHoverColor?: string;
    /** Active state color (e.g., caps lock on) */
    activeStateColor?: string;
    /** Border radius for keys */
    keyBorderRadius?: string;
    /** Font size for keys */
    keyFontSize?: string;
    /** Key height */
    keyHeight?: string;
}

export declare interface VirtualKeyProps {
    keyValue: string;
    onClick: (key: string) => void;
    className?: string;
}

export { }