"use client";

import { toast } from "sonner";
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from "@/components/ui/tooltip";
import { useCallback } from "react";
import { useChat } from "@ai-sdk/react";
import { Button } from "@/components/ui/button";
import { useProblem } from "@/hooks/use-problem";
import MdxPreview from "@/components/mdx-preview";
import { Textarea } from "@/components/ui/textarea";
import { BotIcon, SendHorizonal } from "lucide-react";
import { ScrollArea, ScrollBar } from "@/components/ui/scroll-area";
import { ChatMessageList } from "@/components/ui/chat/chat-message-list";
import { ChatBubble, ChatBubbleMessage } from "@/components/ui/chat/chat-bubble";

export default function Bot() {
  const { problemId, problem, currentLang, currentValue } = useProblem();
  const { messages, input, handleInputChange, setMessages, handleSubmit } = useChat({
    initialMessages: [
      {
        id: problemId,
        role: "system",
        content: `Problem description:\n${problem.description}`,
      },
    ],
  });

  const handleFormSubmit = useCallback(
    (e: React.FormEvent) => {
      e.preventDefault();
      if (!input.trim()) {
        toast.error("Input cannot be empty");
        return;
      }

      const currentCodeMessage = {
        id: problemId,
        role: "system" as const,
        content: `Current code:\n\`\`\`${currentLang}\n${currentValue}\n\`\`\``,
      };

      setMessages((prev) => [...prev, currentCodeMessage]);
      handleSubmit();
    },
    [currentLang, currentValue, handleSubmit, input, problemId, setMessages]
  );

  return (
    <div className="flex flex-col h-full">
      <div className="relative flex-1 border-x border-muted">
        <div className="flex flex-col h-full bg-background">
          <div className="flex-1 relative">
            {!messages.some(
              (message) => message.role === "user" || message.role === "assistant"
            ) && (
              <div className="absolute bottom-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 text-muted-foreground flex flex-col items-center gap-2">
                <BotIcon />
                <span>Ask Bot</span>
                <span className="font-thin text-xs">Powered by Vercel Ai SDK</span>
              </div>
            )}
            <ScrollArea className="[&>[data-radix-scroll-area-viewport]]:max-h-[calc(100vh-238px)] [&>[data-radix-scroll-area-viewport]>div:min-w-0 [&>[data-radix-scroll-area-viewport]>div]:!block">
              <ChatMessageList>
                {messages
                  .filter(
                    (message) => message.role === "user" || message.role === "assistant"
                  )
                  .map((message) => (
                    <ChatBubble key={message.id} layout="ai" className="border-b pb-4">
                      <ChatBubbleMessage layout="ai">
                        <MdxPreview source={message.content} />
                      </ChatBubbleMessage>
                    </ChatBubble>
                  ))}
              </ChatMessageList>
              <ScrollBar orientation="horizontal" />
            </ScrollArea>
          </div>
          <footer className="h-36 flex flex-none">
            <form onSubmit={handleFormSubmit} className="w-full p-4 pt-0 relative">
              <Textarea
                value={input}
                onChange={handleInputChange}
                onKeyDown={(e) => {
                  if ((e.ctrlKey || e.metaKey) && e.key === "Enter") {
                    e.preventDefault();
                    if (input.trim()) {
                      handleFormSubmit(e);
                    } else {
                      toast.error("Input cannot be empty");
                    }
                  }
                }}
                className="h-full bg-muted border-transparent shadow-none rounded-lg"
                placeholder="Bot will automatically get your current code"
              />
              <TooltipProvider delayDuration={0}>
                <Tooltip>
                  <TooltipTrigger asChild>
                    <Button
                      type="submit"
                      variant="ghost"
                      className="absolute bottom-6 right-6 h-6 w-auto px-2"
                      aria-label="Send Message"
                    >
                      <SendHorizonal className="size-4" />
                    </Button>
                  </TooltipTrigger>
                  <TooltipContent className="px-2 py-1 text-xs">Ctrl + Enter</TooltipContent>
                </Tooltip>
              </TooltipProvider>
            </form>
          </footer>
        </div>
      </div>
    </div>
  );
}