"use client";

import type { ChatMessage as ChatMessageType, ActiveMCQ } from '@/types';
import { cn } from '@/lib/utils';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Bot, User, AlertTriangle, CheckCircle, Info } from 'lucide-react';
import { Card, CardContent } from '@/components/ui/card';
import { MCQOptions } from './mcq-options';
import { useState, useEffect } from 'react';

interface ChatMessageProps {
  message: ChatMessageType;
  activeMCQ?: ActiveMCQ | null;
  isAwaitingActiveMCQAnswer?: boolean;
  onOptionSelectActiveMCQ?: (option: string, isCorrect: boolean) => void;
  incorrectAttemptsForMCQ?: string[];
}

export function ChatMessage({
  message,
  activeMCQ,
  isAwaitingActiveMCQAnswer,
  onOptionSelectActiveMCQ,
  incorrectAttemptsForMCQ,
}: ChatMessageProps) {
  const isUser = message.sender === 'user';
  const Icon = isUser ? User : Bot;
  const avatarFallback = isUser ? 'U' : 'AI';
  const [formattedTime, setFormattedTime] = useState('');

  useEffect(() => {
    if (message.timestamp) {
      setFormattedTime(new Date(message.timestamp).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' }));
    }
  }, [message.timestamp]);

  return (
    <div
      className={cn(
        'mb-4 flex items-end space-x-3',
        isUser ? 'justify-end' : 'justify-start'
      )}
    >
      {!isUser && (
        <Avatar className="h-8 w-8 self-start">
          <AvatarImage src="/placeholder-bot.png" alt="AI Avatar" />
          <AvatarFallback><Bot className="h-4 w-4" /></AvatarFallback>
        </Avatar>
      )}
      <Card
        className={cn(
          'max-w-sm rounded-2xl p-0 shadow-md md:max-w-md',
          isUser
            ? 'rounded-br-none bg-primary text-primary-foreground'
            : 'rounded-bl-none bg-card text-card-foreground border'
        )}
      >
        <CardContent className="p-3">
          {message.type === 'mcq' && message.mcq && (
            <div className="space-y-2">
              <p className="font-medium whitespace-pre-wrap">{message.mcq.mcq}</p>
              {isAwaitingActiveMCQAnswer && onOptionSelectActiveMCQ && (
                <div className="mt-3">
                  <MCQOptions
                    mcq={message.mcq}
                    onOptionSelect={onOptionSelectActiveMCQ}
                    disabled={false} 
                    incorrectAttempts={incorrectAttemptsForMCQ || []}
                  />
                </div>
              )}
            </div>
          )}
          {message.type === 'text' && message.text && <p className="whitespace-pre-wrap">{message.text}</p>}
          {message.type === 'feedback' && message.text && (
            <div className="flex items-start">
              {/* Show CheckCircle only if isCorrect and not the final resolution message */}
              {message.isCorrect && message.text && !message.text.includes("The correct answer is") && (
                <CheckCircle className="mr-2 h-5 w-5 shrink-0 text-green-500 mt-0.5" />
              )}
              {/* Show Info icon for incorrect answer explanations where user can try again */}
              {!message.isCorrect && (
                <Info className="mr-2 h-5 w-5 shrink-0 text-blue-500 mt-0.5" />
              )}
              {/* If message.isCorrect is true AND text includes "The correct answer is", no icon will be shown */}
              <p className="flex-1 whitespace-pre-wrap">{message.text}</p>
            </div>
          )}
          {message.type === 'error' && message.text && (
            <div className="flex items-start text-destructive">
              <AlertTriangle className="mr-2 h-5 w-5 shrink-0 mt-0.5" />
              <p className="flex-1 whitespace-pre-wrap">{message.text}</p>
            </div>
          )}
          {message.type === 'user' && message.text && (
             <p className="italic">You chose: "{message.text}"</p>
          )}

          {formattedTime && (
            <p className={cn("mt-1.5 text-xs", isUser ? "text-primary-foreground/70" : "text-muted-foreground")}>
              {formattedTime}
            </p>
          )}
        </CardContent>
      </Card>
      {isUser && (
         <Avatar className="h-8 w-8 self-start">
           <AvatarImage src="/placeholder-user.png" alt="User Avatar" />
           <AvatarFallback><User className="h-4 w-4" /></AvatarFallback>
         </Avatar>
      )}
    </div>
  );
}