'use client';

/* eslint-disable @next/next/no-img-element */
import React, { MutableRefObject, useEffect, useState } from 'react';
import { Message } from './ChatWindow';
import { cn } from '@/lib/utils';
import {
  BookCopy,
  Disc3,
  Volume2,
  StopCircle,
  Layers3,
  Plus,
} from 'lucide-react';
import Markdown, { MarkdownToJSX } from 'markdown-to-jsx';
import Copy from './MessageActions/Copy';
import Rewrite from './MessageActions/Rewrite';
import MessageSources from './MessageSources';
import SearchImages from './SearchImages';
import SearchVideos from './SearchVideos';
import { useSpeech } from 'react-text-to-speech';
import ThinkBox from './ThinkBox';

const ThinkTagProcessor = ({ children }: { children: React.ReactNode }) => {
  return <ThinkBox content={children as string} />;
};

const MessageBox = ({
  message,
  messageIndex,
  history,
  loading,
  dividerRef,
  isLast,
  rewrite,
  sendMessage,
}: {
  message: Message;
  messageIndex: number;
  history: Message[];
  loading: boolean;
  dividerRef?: MutableRefObject<HTMLDivElement | null>;
  isLast: boolean;
  rewrite: (messageId: string) => void;
  sendMessage: (message: string) => void;
}) => {
  const [parsedMessage, setParsedMessage] = useState(message.content);
  const [speechMessage, setSpeechMessage] = useState(message.content);

  useEffect(() => {
    const citationRegex = /\[([^\]]+)\]/g;
    const regex = /\[(\d+)\]/g;
    let processedMessage = message.content;

    if (message.role === 'assistant' && message.content.includes('<think>')) {
      const openThinkTag = processedMessage.match(/<think>/g)?.length || 0;
      const closeThinkTag = processedMessage.match(/<\/think>/g)?.length || 0;

      if (openThinkTag > closeThinkTag) {
        processedMessage += '</think> <a> </a>'; // The extra <a> </a> is to prevent the the think component from looking bad
      }
    }

    if (
      message.role === 'assistant' &&
      message?.sources &&
      message.sources.length > 0
    ) {
      setParsedMessage(
        processedMessage.replace(
          citationRegex, // Use the updated regex
          (match, capturedContent) => { // match is the full "[1,2,3]", capturedContent is "1,2,3"
            // Split the captured content by comma, trim whitespace, and filter out non-digits
            const numbers = capturedContent
              .split(',')
              .map(numStr => numStr.trim())
              .filter(numStr => /^\d+$/.test(numStr)); // Ensure it's only digits

            // If no valid numbers found after split/filter (e.g., "[]" or "[abc]"), return original match
            if (numbers.length === 0) {
              return match;
            }

            // Generate an HTML link for each valid number found
            const linksHtml = numbers.map(numStr => {
              const number = parseInt(numStr, 10); // Convert string to integer for array indexing

              // Basic validation: Ensure it's a positive number
              if (isNaN(number) || number <= 0) {
                // Return the original number part as text if invalid for lookup
                return `[${numStr}]`;
              }

              // Get the corresponding source, adjusting for 0-based index
              const source = message.sources?.[number - 1];
              const url = source?.metadata?.url;

              // If URL exists, create the link
              if (url) {
                return `<a href="${url}" target="_blank" className="bg-light-secondary dark:bg-dark-secondary px-1 rounded ml-1 no-underline text-xs text-black/70 dark:text-white/70 relative">${numStr}</a>`;
              } else {
                // If no URL found for this number, return the number styled similarly but red
                return `<span className="bg-light-secondary dark:bg-dark-secondary px-1 rounded ml-1 text-xs relative font-medium text-red-600 dark:text-red-400">${numStr}</span>`;
              }
            }).join(''); // Join the generated links (or fallback text) together without separators

            return linksHtml;
          }
        )
      );
      return;
    }

    setSpeechMessage(message.content.replace(regex, ''));
    setParsedMessage(processedMessage);
  }, [message.content, message.sources, message.role]);

  const { speechStatus, start, stop } = useSpeech({ text: speechMessage });

  const markdownOverrides: MarkdownToJSX.Options = {
    overrides: {
      think: {
        component: ThinkTagProcessor,
      },
    },
  };

  return (
    <div>
      {message.role === 'user' && (
        <div
          className={cn(
            'w-full',
            messageIndex === 0 ? 'pt-16' : 'pt-8',
            'break-words',
          )}
        >
          <h2 className="text-black dark:text-white font-medium text-3xl lg:w-9/12">
            {message.content}
          </h2>
        </div>
      )}

      {message.role === 'assistant' && (
        <div className="flex flex-col space-y-9 lg:space-y-0 lg:flex-row lg:justify-between lg:space-x-9">
          <div
            ref={dividerRef}
            className="flex flex-col space-y-6 w-full lg:w-9/12"
          >
            {message.sources && message.sources.length > 0 && (
              <div className="flex flex-col space-y-2">
                <div className="flex flex-row items-center space-x-2">
                  <BookCopy className="text-black dark:text-white" size={20} />
                  <h3 className="text-black dark:text-white font-medium text-xl">
                    Sources
                  </h3>
                </div>
                <MessageSources sources={message.sources} />
              </div>
            )}
            <div className="flex flex-col space-y-2">
              <div className="flex flex-row items-center space-x-2">
                <Disc3
                  className={cn(
                    'text-black dark:text-white',
                    isLast && loading ? 'animate-spin' : 'animate-none',
                  )}
                  size={20}
                />
                <h3 className="text-black dark:text-white font-medium text-xl">
                  Answer
                </h3>
              </div>

              <Markdown
                className={cn(
                  'prose prose-h1:mb-3 prose-h2:mb-2 prose-h2:mt-6 prose-h2:font-[800] prose-h3:mt-4 prose-h3:mb-1.5 prose-h3:font-[600] dark:prose-invert prose-p:leading-relaxed prose-pre:p-0 font-[400]',
                  'max-w-none break-words text-black dark:text-white',
                )}
                options={markdownOverrides}
              >
                {parsedMessage}
              </Markdown>
              {loading && isLast ? null : (
                <div className="flex flex-row items-center justify-between w-full text-black dark:text-white py-4 -mx-2">
                  <div className="flex flex-row items-center space-x-1">
                    {/*  <button className="p-2 text-black/70 dark:text-white/70 rounded-xl hover:bg-light-secondary dark:hover:bg-dark-secondary transition duration-200 hover:text-black text-black dark:hover:text-white">
                      <Share size={18} />
                    </button> */}
                    <Rewrite rewrite={rewrite} messageId={message.messageId} />
                  </div>
                  <div className="flex flex-row items-center space-x-1">
                    <Copy initialMessage={message.content} message={message} />
                    <button
                      onClick={() => {
                        if (speechStatus === 'started') {
                          stop();
                        } else {
                          start();
                        }
                      }}
                      className="p-2 text-black/70 dark:text-white/70 rounded-xl hover:bg-light-secondary dark:hover:bg-dark-secondary transition duration-200 hover:text-black dark:hover:text-white"
                    >
                      {speechStatus === 'started' ? (
                        <StopCircle size={18} />
                      ) : (
                        <Volume2 size={18} />
                      )}
                    </button>
                  </div>
                </div>
              )}
              {isLast &&
                message.suggestions &&
                message.suggestions.length > 0 &&
                message.role === 'assistant' &&
                !loading && (
                  <>
                    <div className="h-px w-full bg-light-secondary dark:bg-dark-secondary" />
                    <div className="flex flex-col space-y-3 text-black dark:text-white">
                      <div className="flex flex-row items-center space-x-2 mt-4">
                        <Layers3 />
                        <h3 className="text-xl font-medium">Related</h3>
                      </div>
                      <div className="flex flex-col space-y-3">
                        {message.suggestions.map((suggestion, i) => (
                          <div
                            className="flex flex-col space-y-3 text-sm"
                            key={i}
                          >
                            <div className="h-px w-full bg-light-secondary dark:bg-dark-secondary" />
                            <div
                              onClick={() => {
                                sendMessage(suggestion);
                              }}
                              className="cursor-pointer flex flex-row justify-between font-medium space-x-2 items-center"
                            >
                              <p className="transition duration-200 hover:text-[#24A0ED]">
                                {suggestion}
                              </p>
                              <Plus
                                size={20}
                                className="text-[#24A0ED] flex-shrink-0"
                              />
                            </div>
                          </div>
                        ))}
                      </div>
                    </div>
                  </>
                )}
            </div>
          </div>
          <div className="lg:sticky lg:top-20 flex flex-col items-center space-y-3 w-full lg:w-3/12 z-30 h-full pb-4">
            <SearchImages
              query={history[messageIndex - 1].content}
              chatHistory={history.slice(0, messageIndex - 1)}
              messageId={message.messageId}
            />
            <SearchVideos
              chatHistory={history.slice(0, messageIndex - 1)}
              query={history[messageIndex - 1].content}
              messageId={message.messageId}
            />
          </div>
        </div>
      )}
    </div>
  );
};

export default MessageBox;