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import {
useRef,
useEffect,
useCallback,
ChangeEvent,
KeyboardEvent,
} from 'react';
import { useCopilotChat } from '@copilotkit/react-core';
import { Role, TextMessage } from '@copilotkit/runtime-client-gql';
// Icons
import { SendIcon } from '../icons/reacts';
// Constants
import { KEYBOARD_EVENT } from '@shared/constants';
// Utils
import { combineClasses } from '@shared/utils';
// Stores
import {
useChatInputValue,
useSetChatInputValue,
useSetTextareaCursorPosition,
useSetTextareaScrollTop,
useTextareaCursorPosition,
useTextareaScrollTop,
} from '@/stores';
export const CustomInput = ({ inProgress }: InputProps) => {
const { appendMessage } = useCopilotChat();
const inputValue = useChatInputValue();
const textareaCursorPosition = useTextareaCursorPosition();
const textareaScrollTop = useTextareaScrollTop();
const textareaRef = useRef<HTMLTextAreaElement>(null);
const textareaWrapperRef = useRef<HTMLDivElement>(null);
const touchedTextarea = useRef(false);
const isSend = !!inputValue.trim();
// Save textarea position (cursor position and scroll)
const saveTextareaPosition = useCallback(() => {
const textarea = textareaRef.current;
if (textarea) {
useSetTextareaCursorPosition(textarea.selectionStart);
useSetTextareaScrollTop(textarea.scrollTop);
}
}, [useSetTextareaCursorPosition, useSetTextareaScrollTop]);
// Restore textarea position (cursor position and scroll)
const restoreTextareaPosition = () => {
const textarea = textareaRef.current;
if (textarea) {
// Restore scroll position in percentage of max scroll height
textarea.scrollTop =
textareaScrollTop * (textarea.scrollHeight - textarea.clientHeight);
// Restore cursor position
textarea.setSelectionRange(
textareaCursorPosition,
textareaCursorPosition,
);
}
};
const handleSubmit = useCallback(
async (value: string) => {
if (value.trim()) {
const message = new TextMessage({
content: value,
role: Role.User,
});
appendMessage(message);
useSetChatInputValue('');
}
},
[appendMessage, useSetChatInputValue],
);
const handleOnKeydownInput = (e: KeyboardEvent<HTMLTextAreaElement>) => {
if (e.key === KEYBOARD_EVENT.ENTER && !e.shiftKey) {
e.preventDefault();
handleSubmit(inputValue);
}
};
const handleSendClick = () => {
if (inputValue.trim()) {
handleSubmit(inputValue);
}
};
// Dynamically resize textarea and setup mobile scrolling
const resizeTextarea = useCallback(() => {
const textarea = textareaRef.current;
const wrapper = textareaWrapperRef.current;
if (!textarea || !wrapper) return;
textarea.style.height = 'auto';
// Limit height to max 100px
const newHeight = Math.min(textarea.scrollHeight, 100);
wrapper.style.height = `${newHeight}px`;
textarea.style.height = '100%'; // Textarea fills full height of wrapper
// Setup mobile scrolling only once
if (!touchedTextarea.current) {
textarea.style.overflowY = 'auto';
// Enable smooth momentum scrolling on iOS devices
textarea.style.setProperty('-webkit-overflow-scrolling', 'touch');
// Prevent scroll events from bubbling up to parent elements
// This stops the page from scrolling when user scrolls inside textarea
textarea.addEventListener('touchstart', (e) => e.stopPropagation(), {
passive: true,
});
textarea.addEventListener('touchmove', (e) => e.stopPropagation(), {
passive: true,
});
// Mark as completed to prevent adding duplicate listeners
touchedTextarea.current = true;
}
}, []);
const handleOnChangeInput = useCallback(
(e: ChangeEvent<HTMLTextAreaElement>) => {
useSetChatInputValue(e.target.value);
// Delay resize textarea to avoid flickering
requestAnimationFrame(resizeTextarea);
},
[useSetChatInputValue, resizeTextarea],
);
// Resize textarea when input value changes
useEffect(() => {
resizeTextarea();
}, [inputValue, resizeTextarea]);
useEffect(() => {
if (!inProgress && textareaRef.current) {
textareaRef.current.focus();
}
}, [inProgress, textareaRef]);
// Restore textarea state only when component mounts with existing input
useEffect(() => {
if (textareaRef.current && inputValue) {
// Use a small delay to ensure the textarea is fully rendered
setTimeout(() => {
restoreTextareaPosition();
}, 50);
}
}, []); // Only run once on mount
return (
<div className="px-5 pb-5">
<div
className={combineClasses(
'flex w-full rounded-md bg-primary-200 gap-1 items-center dark:bg-secondary-970',
)}
>
<div className={combineClasses('flex w-full')}>
{/* Textarea wrapper with dynamic height */}
<div
ref={textareaWrapperRef}
className="w-full p-2 pr-0 min-h-12.5 max-h-25"
>
<textarea
id="chat-input"
rows={1}
ref={textareaRef}
disabled={inProgress}
value={inputValue}
onChange={handleOnChangeInput}
onSelect={saveTextareaPosition}
onScroll={saveTextareaPosition}
placeholder="Type your message here"
onKeyDown={handleOnKeydownInput}
aria-label="Chat message input"
className={combineClasses(
'size-full py-2 px-1.5 resize-none tiny-scrollbar overflow-y-auto',
'text-xs sm:text-3xs leading-tight font-normal bg-primary-200',
'focus:outline-none disabled:bg-primary-200 placeholder:text-muted-foreground dark:bg-secondary-970 dark:placeholder:text-background dark:text-background dark:disabled:bg-secondary-970',
)}
/>
</div>
</div>
{/* Action buttons container */}
<div className={combineClasses('flex items-center self-stretch')}>
{/* Send message button */}
<button
aria-label="Send chat button"
disabled={!isSend || inProgress}
className="p-2 px-3 disabled:opacity-50"
onClick={handleSendClick}
>
<SendIcon className="text-primary-600" />
</button>
</div>
</div>
</div>
);
};
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