import React, { useState, useEffect } from 'react';
import { Button } from '@/components/ui/button';
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog';
import { Input } from '@/components/ui/input';
import { Users, Link, Copy, CheckCircle, Send } from 'lucide-react';
import { useToast } from '@/hooks/use-toast';

interface WatchTogetherProps {
  title: string;
  currentTime: number;
  duration: number;
  onSeek?: (time: number) => void;
}

interface Message {
  id: string;
  name: string;
  text: string;
  timestamp: number;
  type: 'chat' | 'system' | 'timestamp';
}

const WatchTogether: React.FC<WatchTogetherProps> = ({ title, currentTime, duration, onSeek }) => {
  const [isOpen, setIsOpen] = useState(false);
  const [roomId, setRoomId] = useState<string>('');
  const [userName, setUserName] = useState<string>('');
  const [message, setMessage] = useState<string>('');
  const [messages, setMessages] = useState<Message[]>([]);
  const [userCount, setUserCount] = useState(1);
  const [isHost, setIsHost] = useState(true);
  const [linkCopied, setLinkCopied] = useState(false);
  
  const { toast } = useToast();
  
  // Generate room ID on mount
  useEffect(() => {
    const id = `room-${Math.random().toString(36).substring(2, 8)}`;
    setRoomId(id);
    
    // If no username set, use a default
    if (!userName) {
      setUserName(`User${Math.floor(Math.random() * 10000)}`);
    }
    
    // Initial system message
    addSystemMessage(`Watch Party started for "${title}"`);
  }, [title]);
  
  // Function to add system message
  const addSystemMessage = (text: string) => {
    const newMessage: Message = {
      id: `sys-${Date.now()}`,
      name: 'System',
      text,
      timestamp: Date.now(),
      type: 'system'
    };
    setMessages(prev => [...prev, newMessage]);
  };
  
  // Function to add user message
  const addUserMessage = () => {
    if (!message.trim()) return;
    
    // If message starts with '/seek ', treat as seek command
    if (message.startsWith('/seek ')) {
      const seekTime = parseInt(message.replace('/seek ', ''));
      if (!isNaN(seekTime) && seekTime >= 0 && seekTime <= duration) {
        handleSeek(seekTime);
        setMessage('');
        return;
      }
    }
    
    // Regular message
    const newMessage: Message = {
      id: `msg-${Date.now()}`,
      name: userName,
      text: message,
      timestamp: Date.now(),
      type: 'chat'
    };
    
    setMessages(prev => [...prev, newMessage]);
    setMessage('');
  };
  
  // Function to handle seeking
  const handleSeek = (time: number) => {
    if (onSeek) {
      onSeek(time);
      
      // Add timestamp message
      const newMessage: Message = {
        id: `time-${Date.now()}`,
        name: userName,
        text: `Seeked to ${formatTime(time)}`,
        timestamp: Date.now(),
        type: 'timestamp'
      };
      setMessages(prev => [...prev, newMessage]);
    }
  };
  
  // Function to share current timestamp
  const shareCurrentTime = () => {
    const newMessage: Message = {
      id: `time-${Date.now()}`,
      name: userName,
      text: `Current position: ${formatTime(currentTime)}`,
      timestamp: Date.now(),
      type: 'timestamp'
    };
    setMessages(prev => [...prev, newMessage]);
  };
  
  // Function to format time
  const formatTime = (timeInSeconds: number) => {
    const minutes = Math.floor(timeInSeconds / 60);
    const seconds = Math.floor(timeInSeconds % 60);
    return `${minutes}:${seconds < 10 ? '0' : ''}${seconds}`;
  };
  
  // Function to copy invite link
  const copyInviteLink = () => {
    const inviteLink = `${window.location.href}?room=${roomId}&host=false`;
    navigator.clipboard.writeText(inviteLink);
    setLinkCopied(true);
    
    toast({
      title: "Link Copied",
      description: "Share this link with friends to watch together",
    });
    
    setTimeout(() => setLinkCopied(false), 2000);
  };
  
  // Simulate someone joining after a delay
  useEffect(() => {
    if (isOpen && isHost) {
      const timer = setTimeout(() => {
        setUserCount(2);
        addSystemMessage("Alice has joined the watch party");
      }, 5000);
      
      return () => clearTimeout(timer);
    }
  }, [isOpen, isHost]);
  
  // Add mock message after some delays
  useEffect(() => {
    if (isOpen && userCount > 1) {
      const timer1 = setTimeout(() => {
        setMessages(prev => [
          ...prev, 
          {
            id: `msg-alice-1`,
            name: "Alice",
            text: "Hey, thanks for inviting me!",
            timestamp: Date.now(),
            type: 'chat'
          }
        ]);
      }, 3000);
      
      const timer2 = setTimeout(() => {
        setMessages(prev => [
          ...prev, 
          {
            id: `msg-alice-2`,
            name: "Alice",
            text: "I love this part coming up!",
            timestamp: Date.now(),
            type: 'chat'
          }
        ]);
      }, 15000);
      
      return () => {
        clearTimeout(timer1);
        clearTimeout(timer2);
      };
    }
  }, [isOpen, userCount]);
  
  return (
    <Dialog open={isOpen} onOpenChange={setIsOpen}>
      <DialogTrigger asChild>
        <Button 
          variant="outline" 
          size="sm" 
          className="fixed top-4 right-36 z-50 bg-gray-800/80 hover:bg-gray-700/80 text-white border-gray-600"
          onClick={() => setIsOpen(true)}
        >
          <Users className="mr-2 h-4 w-4" />
          Watch Together
        </Button>
      </DialogTrigger>
      
      <DialogContent className="sm:max-w-[425px] bg-gray-900 text-white border-gray-700">
        <DialogHeader>
          <DialogTitle>Watch Together</DialogTitle>
        </DialogHeader>
        
        <div className="flex items-center justify-between py-2 px-4 bg-gray-800 rounded-lg">
          <div className="flex items-center">
            <Users className="h-5 w-5 mr-2 text-theme-primary" />
            <span>{userCount} {userCount === 1 ? 'viewer' : 'viewers'}</span>
          </div>
          
          <div className="flex items-center space-x-2">
            <Link className="h-4 w-4 text-gray-400" />
            <button
              onClick={copyInviteLink}
              className="text-sm text-theme-primary hover:text-theme-primary-light flex items-center"
            >
              {linkCopied ? (
                <><CheckCircle className="h-4 w-4 mr-1" /> Copied</>
              ) : (
                <><Copy className="h-4 w-4 mr-1" /> Copy Invite Link</>
              )}
            </button>
          </div>
        </div>
        
        {/* Chat messages */}
        <div className="flex flex-col space-y-4 h-[250px] overflow-y-auto py-2 px-1">
          {messages.map((msg) => (
            <div 
              key={msg.id}
              className={`flex flex-col ${msg.name === userName ? 'items-end' : 'items-start'}`}
            >
              {msg.type === 'system' ? (
                <div className="bg-gray-800/50 text-gray-300 py-1 px-3 rounded-md text-xs w-full text-center">
                  {msg.text}
                </div>
              ) : msg.type === 'timestamp' ? (
                <div 
                  className={`bg-theme-primary/20 text-theme-primary py-1 px-3 rounded-md text-xs cursor-pointer hover:bg-theme-primary/30 ${
                    msg.name === userName ? 'self-end' : 'self-start'
                  }`}
                  onClick={() => {
                    const timeMatch = msg.text.match(/(\d+):(\d+)/);
                    if (timeMatch) {
                      const minutes = parseInt(timeMatch[1]);
                      const seconds = parseInt(timeMatch[2]);
                      const totalSeconds = minutes * 60 + seconds;
                      onSeek?.(totalSeconds);
                    }
                  }}
                >
                  {msg.text}
                </div>
              ) : (
                <>
                  <span className="text-xs text-gray-400 mb-1">
                    {msg.name === userName ? 'You' : msg.name}
                  </span>
                  <div 
                    className={`py-2 px-3 rounded-lg max-w-[80%] ${
                      msg.name === userName 
                        ? 'bg-theme-primary text-white' 
                        : 'bg-gray-800 text-gray-200'
                    }`}
                  >
                    <p className="text-sm">{msg.text}</p>
                  </div>
                </>
              )}
            </div>
          ))}
        </div>
        
        {/* Share current timestamp button */}
        <button 
          onClick={shareCurrentTime}
          className="text-sm text-theme-primary hover:text-theme-primary-light flex items-center self-center"
        >
          Share current timestamp ({formatTime(currentTime)})
        </button>
        
        {/* Chat input */}
        <div className="flex space-x-2 mt-2">
          <Input
            placeholder="Type a message..."
            value={message}
            onChange={(e) => setMessage(e.target.value)}
            className="bg-gray-800 border-gray-700 text-white"
            onKeyDown={(e) => {
              if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault();
                addUserMessage();
              }
            }}
          />
          <Button 
            size="icon"
            onClick={addUserMessage}
            className="bg-theme-primary hover:bg-theme-primary-hover"
          >
            <Send className="h-4 w-4" />
          </Button>
        </div>
        
        <p className="text-xs text-gray-400 mt-2">
          Pro tip: Type '/seek 10' to jump to 10 seconds, or click on any shared timestamp to seek.
        </p>
      </DialogContent>
    </Dialog>
  );
};

export default WatchTogether;