import { Message } from '@/types';
import { IconEdit } from '@tabler/icons-react';
import { useTranslation } from 'next-i18next';
import { FC, useEffect, useRef, useState } from 'react';
import ReactMarkdown from 'react-markdown';
import rehypeMathjax from 'rehype-mathjax';
import remarkGfm from 'remark-gfm';
import remarkMath from 'remark-math';
import { CodeBlock } from '../Markdown/CodeBlock';
import { CopyButton } from './CopyButton';

interface Props {
  message: Message;
  messageIndex: number;
  lightMode: 'light' | 'dark';
  onEditMessage: (message: Message, messageIndex: number) => void;
}

export const ChatMessage: FC<Props> = ({
  message,
  messageIndex,
  lightMode,
  onEditMessage,
}) => {
  const { t } = useTranslation('chat');
  const [isEditing, setIsEditing] = useState<boolean>(false);
  const [isHovering, setIsHovering] = useState<boolean>(false);
  const [messageContent, setMessageContent] = useState(message.content);
  const [messagedCopied, setMessageCopied] = useState(false);

  const textareaRef = useRef<HTMLTextAreaElement>(null);

  const toggleEditing = () => {
    setIsEditing(!isEditing);
  };

  const handleInputChange = (event: React.ChangeEvent<HTMLTextAreaElement>) => {
    setMessageContent(event.target.value);
    if (textareaRef.current) {
      textareaRef.current.style.height = 'inherit';
      textareaRef.current.style.height = `${textareaRef.current.scrollHeight}px`;
    }
  };

  const handleEditMessage = () => {
    if (message.content != messageContent) {
      onEditMessage({ ...message, content: messageContent }, messageIndex);
    }
    setIsEditing(false);
  };

  const handlePressEnter = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      handleEditMessage();
    }
  };

  const copyOnClick = () => {
    if (!navigator.clipboard) return;

    navigator.clipboard.writeText(message.content).then(() => {
      setMessageCopied(true);
      setTimeout(() => {
        setMessageCopied(false);
      }, 2000);
    });
  };

  useEffect(() => {
    if (textareaRef.current) {
      textareaRef.current.style.height = 'inherit';
      textareaRef.current.style.height = `${textareaRef.current.scrollHeight}px`;
    }
  }, [isEditing]);

  return (
    <div
      className={`group ${
        message.role === 'assistant'
          ? 'border-b border-black/10 bg-gray-50 text-gray-800 dark:border-gray-900/50 dark:bg-[#444654] dark:text-gray-100'
          : 'border-b border-black/10 bg-white text-gray-800 dark:border-gray-900/50 dark:bg-[#343541] dark:text-gray-100'
      }`}
      style={{ overflowWrap: 'anywhere' }}
      onMouseEnter={() => setIsHovering(true)}
      onMouseLeave={() => setIsHovering(false)}
    >
      <div className="relative m-auto flex gap-4 p-4 text-base md:max-w-2xl md:gap-6 md:py-6 lg:max-w-2xl lg:px-0 xl:max-w-3xl">
        <div className="min-w-[40px] font-bold">
          {message.role === 'assistant' ? t('AI') : t('You')}:
        </div>

        <div className="prose mt-[-2px] w-full dark:prose-invert">
          {message.role === 'user' ? (
            <div className="flex w-full">
              {isEditing ? (
                <div className="flex w-full flex-col">
                  <textarea
                    ref={textareaRef}
                    className="w-full resize-none whitespace-pre-wrap border-none outline-none dark:bg-[#343541]"
                    value={messageContent}
                    onChange={handleInputChange}
                    onKeyDown={handlePressEnter}
                    style={{
                      fontFamily: 'inherit',
                      fontSize: 'inherit',
                      lineHeight: 'inherit',
                      padding: '0',
                      margin: '0',
                      overflow: 'hidden',
                    }}
                  />

                  <div className="mt-10 flex justify-center space-x-4">
                    <button
                      className="h-[40px] rounded-md bg-blue-500 px-4 py-1 text-sm font-medium text-white enabled:hover:bg-blue-600 disabled:opacity-50"
                      onClick={handleEditMessage}
                      disabled={messageContent.trim().length <= 0}
                    >
                      Save & Submit
                    </button>
                    <button
                      className="h-[40px] rounded-md border border-neutral-300 px-4 py-1 text-sm font-medium text-neutral-700 hover:bg-neutral-100 dark:border-neutral-700 dark:text-neutral-300 dark:hover:bg-neutral-800"
                      onClick={() => {
                        setMessageContent(message.content);
                        setIsEditing(false);
                      }}
                    >
                      Cancel
                    </button>
                  </div>
                </div>
              ) : (
                <div className="prose whitespace-pre-wrap dark:prose-invert">
                  {message.content}
                </div>
              )}

              {(isHovering || window.innerWidth < 640) && !isEditing && (
                <button
                  className={`absolute ${
                    window.innerWidth < 640
                      ? 'right-3 bottom-1'
                      : 'right-[-20px] top-[26px]'
                  }`}
                >
                  <IconEdit
                    size={20}
                    className="text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-300"
                    onClick={toggleEditing}
                  />
                </button>
              )}
            </div>
          ) : (
            <>
              <ReactMarkdown
                className="prose dark:prose-invert"
                remarkPlugins={[remarkGfm, remarkMath]}
                rehypePlugins={[rehypeMathjax]}
                components={{
                  code({ node, inline, className, children, ...props }) {
                    const match = /language-(\w+)/.exec(className || '');
                    return !inline && match ? (
                      <CodeBlock
                        key={Math.random()}
                        language={match[1]}
                        value={String(children).replace(/\n$/, '')}
                        lightMode={lightMode}
                        {...props}
                      />
                    ) : (
                      <code className={className} {...props}>
                        {children}
                      </code>
                    );
                  },
                  table({ children }) {
                    return (
                      <table className="border-collapse border border-black py-1 px-3 dark:border-white">
                        {children}
                      </table>
                    );
                  },
                  th({ children }) {
                    return (
                      <th className="break-words border border-black bg-gray-500 py-1 px-3 text-white dark:border-white">
                        {children}
                      </th>
                    );
                  },
                  td({ children }) {
                    return (
                      <td className="break-words border border-black py-1 px-3 dark:border-white">
                        {children}
                      </td>
                    );
                  },
                }}
              >
                {message.content}
              </ReactMarkdown>

              {(isHovering || window.innerWidth < 640) && (
                <CopyButton
                  messagedCopied={messagedCopied}
                  copyOnClick={copyOnClick}
                />
              )}
            </>
          )}
        </div>
      </div>
    </div>
  );
};