import useIsomorphicLayoutEffect from './useIsomorphicLayoutEffect';
import { off, on } from './misc/util';
var isFocusedElementEditable = function () {
    var activeElement = document.activeElement, body = document.body;
    if (!activeElement) {
        return false;
    }
    // If not element has focus, we assume it is not editable, too.
    if (activeElement === body) {
        return false;
    }
    // Assume <input> and <textarea> elements are editable.
    switch (activeElement.tagName) {
        case 'INPUT':
        case 'TEXTAREA':
            return true;
    }
    // Check if any other focused element id editable.
    return activeElement.hasAttribute('contenteditable');
};
var isTypedCharGood = function (_a) {
    var keyCode = _a.keyCode, metaKey = _a.metaKey, ctrlKey = _a.ctrlKey, altKey = _a.altKey;
    if (metaKey || ctrlKey || altKey) {
        return false;
    }
    // 0...9
    if (keyCode >= 48 && keyCode <= 57) {
        return true;
    }
    // a...z
    if (keyCode >= 65 && keyCode <= 90) {
        return true;
    }
    // All other keys.
    return false;
};
var useStartTyping = function (onStartTyping) {
    useIsomorphicLayoutEffect(function () {
        var keydown = function (event) {
            !isFocusedElementEditable() && isTypedCharGood(event) && onStartTyping(event);
        };
        on(document, 'keydown', keydown);
        return function () {
            off(document, 'keydown', keydown);
        };
    }, []);
};
export default useStartTyping;