components/chat/Composer.tsx

'use client';

import * as React from 'react';
import { type UseChatHelpers } from 'ai/react';
import Textarea from 'react-textarea-autosize';

import { Button } from '@/components/ui/Button';
import { MessageBase } from '../../lib/types';
import { useEnterSubmit } from '@/lib/hooks/useEnterSubmit';
import Img from '../ui/Img';
import {
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from '@/components/ui/Tooltip';
import {
  IconArrowDown,
  IconArrowElbow,
  IconRefresh,
  IconStop,
} from '@/components/ui/Icons';
import { cn } from '@/lib/utils';
import { generateInputImageMarkdown } from '@/lib/messageUtils';
import { Switch } from '../ui/Switch';

export interface ComposerProps
  extends Pick<
    UseChatHelpers,
    'append' | 'isLoading' | 'reload' | 'stop' | 'input' | 'setInput'
  > {
  id?: string;
  title?: string;
  messages: MessageBase[];
  url?: string;
  isAtBottom: boolean;
  scrollToBottom: () => void;
}

export function Composer({
  id,
  title,
  isLoading,
  stop,
  append,
  reload,
  input,
  setInput,
  messages,
  isAtBottom,
  scrollToBottom,
  url,
}: ComposerProps) {
  const { formRef, onKeyDown } = useEnterSubmit();
  const inputRef = React.useRef<HTMLTextAreaElement>(null);
  React.useEffect(() => {
    if (inputRef.current) {
      inputRef.current.focus();
    }
  }, []);

  return (
    // <div className="fixed inset-x-0 bottom-0 w-full animate-in duration-300 ease-in-out peer-[[data-state=open]]:group-[]:lg:pl-[250px] peer-[[data-state=open]]:group-[]:xl:pl-[300px] h-[178px]">
    <div className="mx-auto sm:max-w-3xl sm:px-4 h-full">
      <div className="px-4 py-2 space-y-4 border-t shadow-lg bg-background sm:rounded-t-xl sm:border md:py-4 h-full">
        <form
          onSubmit={async e => {
            e.preventDefault();
            if (!input?.trim()) {
              return;
            }
            setInput('');
            await append({
              id,
              content:
                input + (url ? '\n\n' + generateInputImageMarkdown(url) : ''),
              role: 'user',
            });
            scrollToBottom();
          }}
          ref={formRef}
          className="h-full"
        >
          <div className="relative flex px-8 pl-2 overflow-hidden size-full bg-background sm:rounded-md sm:border sm:px-12 sm:pl-2 items-start">
            {url && (
              <div className="w-1/5 p-2 h-full flex items-center justify-center relative">
                <Tooltip>
                  <TooltipTrigger asChild>
                    <Img
                      src={url}
                      className="cursor-zoom-in"
                      alt="preview-image"
                    />
                  </TooltipTrigger>
                  <TooltipContent>
                    <Img
                      src={url}
                      className="m-2"
                      quality={100}
                      width={500}
                      alt="zoomed-in-image"
                    />
                  </TooltipContent>
                </Tooltip>
              </div>
            )}
            <div className="flex flex-col gap-2 w-4/5 px-4">
              <Textarea
                ref={inputRef}
                tabIndex={0}
                onKeyDown={onKeyDown}
                rows={1}
                value={input}
                disabled={isLoading}
                onChange={e => setInput(e.target.value)}
                placeholder={
                  isLoading
                    ? 'Vision Agent is thinking...'
                    : 'Ask question about the image.'
                }
                spellCheck={false}
                className="min-h-[60px] resize-none bg-transparent py-[1.3em] focus-within:outline-none sm:text-sm"
              />
            </div>
            {/* Scroll to bottom Icon */}
            <div
              className={cn(
                'absolute top-3 right-4 transition-opacity duration-300',
                isAtBottom ? 'opacity-0' : 'opacity-100',
              )}
            >
              <Tooltip>
                <TooltipTrigger asChild>
                  <Button
                    variant="outline"
                    size="icon"
                    className="bg-background"
                    onClick={() => scrollToBottom()}
                  >
                    <IconArrowDown />
                  </Button>
                </TooltipTrigger>
                <TooltipContent>Scroll to bottom</TooltipContent>
              </Tooltip>
            </div>
            {/* Stop / Regenerate Icon */}
            <div className="absolute bottom-14 right-4">
              {isLoading ? (
                <Tooltip>
                  <TooltipTrigger asChild>
                    <Button
                      variant="outline"
                      size="icon"
                      className="bg-background"
                      onClick={() => stop()}
                    >
                      <IconStop />
                    </Button>
                  </TooltipTrigger>
                  <TooltipContent>Stop generating</TooltipContent>
                </Tooltip>
              ) : (
                messages?.length >= 2 && (
                  <Tooltip>
                    <TooltipTrigger asChild>
                      <Button
                        variant="outline"
                        size="icon"
                        className="bg-background"
                        onClick={() => reload()}
                      >
                        <IconRefresh />
                      </Button>
                    </TooltipTrigger>
                    <TooltipContent>Regenerate response</TooltipContent>
                  </Tooltip>
                )
              )}
            </div>
            {/* Submit Icon */}
            <div className="absolute bottom-3 right-4">
              <Tooltip>
                <TooltipTrigger asChild>
                  <Button
                    type="submit"
                    size="icon"
                    disabled={isLoading || input === ''}
                  >
                    <IconArrowElbow />
                  </Button>
                </TooltipTrigger>
                <TooltipContent>Send message</TooltipContent>
              </Tooltip>
            </div>
          </div>
        </form>
      </div>
    </div>
    // </div>
  );
}