"use client";

import { useEffect, useRef, useState } from "react";
import { motion } from "framer-motion";

interface VoiceChatProps {
  onTranscript?: (text: string) => void;
}

export default function VoiceChat({ onTranscript }: VoiceChatProps) {
  const [isListening, setIsListening] = useState(false);
  const [transcript, setTranscript] = useState("");
  const [response, setResponse] = useState("");
  const [isProcessing, setIsProcessing] = useState(false);
  const [speechSupported, setSpeechSupported] = useState(true);
  
  const recognitionRef = useRef<any>(null);
  const messagesEndRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const SpeechRecognition = (window as any).SpeechRecognition || (window as any).webkitSpeechRecognition;
    
    if (!SpeechRecognition) {
      setSpeechSupported(false);
      return;
    }

    const recognition = new SpeechRecognition();
    recognition.lang = "es-ES";
    recognition.interimResults = true;
    recognition.continuous = false;

    recognition.onresult = (event: any) => {
      const result = Array.from(event.results)
        .map((res: any) => res[0]?.transcript ?? "")
        .join("");
      setTranscript(result);
    };

    recognition.onend = () => {
      setIsListening(false);
      if (transcript.trim()) {
        handleSend(transcript);
      }
    };

    recognition.onerror = (event: any) => {
      console.error("Speech recognition error:", event.error);
      setIsListening(false);
    };

    recognitionRef.current = recognition;

    return () => {
      if (recognitionRef.current) {
        recognitionRef.current.abort();
      }
    };
  }, []);

  const toggleListening = () => {
    if (isListening) {
      recognitionRef.current?.stop();
      setIsListening(false);
    } else {
      setTranscript("");
      recognitionRef.current?.start();
      setIsListening(true);
    }
  };

  const handleSend = async (text: string) => {
    if (!text.trim() || isProcessing) return;
    
    setIsProcessing(true);
    const userMessage = text;
    setTranscript("");
    
    // Simulate AI response (replace with actual API call)
    const responses: Record<string, string> = {
      "hola": "¡Hola! Soy Horus. ¿En qué puedo ayudarte hoy?",
      "hello": "Hi! I'm Horus. How can I help you today?",
      "qué tareas": "Tienes varias tareas pendientes en Mission Control. La más crítica es conseguir tu primer cliente pagado.",
      "what tasks": "You have several pending tasks in Mission Control. The most critical is closing your first paying client.",
      "estado": "Todo funciona bien. El servidor está en puerto 1284, el firewall configurado, y los briefings están programados para las 6am.",
      "status": "Everything is running fine. Server on port 1284, firewall configured, briefings scheduled for 6am.",
    };

    // Simple keyword matching
    let botResponse = "Entendido. Puedo ayudarte con Mission Control, los proyectos SiteMente, o configurar el sistema.";
    const lower = userMessage.toLowerCase();
    
    for (const [key, value] of Object.entries(responses)) {
      if (lower.includes(key)) {
        botResponse = value;
        break;
      }
    }

    // Simulate delay
    await new Promise(resolve => setTimeout(resolve, 800));
    
    setResponse(botResponse);
    setIsProcessing(false);
    
    // Speak the response
    speak(botResponse);
    
    if (onTranscript) {
      onTranscript(userMessage);
    }
  };

  const speak = (text: string) => {
    const utterance = new SpeechSynthesisUtterance(text);
    utterance.lang = "es-ES";
    speechSynthesis.speak(utterance);
  };

  const handleKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === "Enter" && !e.shiftKey) {
      e.preventDefault();
      handleSend(transcript);
    }
  };

  if (!speechSupported) {
    return (
      <div className="p-4 rounded-xl border border-white/10 bg-white/5">
        <p className="text-white/60 text-sm">Voice not supported in this browser</p>
      </div>
    );
  }

  return (
    <div className="rounded-xl border border-white/10 bg-white/5 overflow-hidden">
      {/* Header */}
      <div className="flex items-center justify-between px-4 py-3 border-b border-white/10">
        <div className="flex items-center gap-2">
          <span className="text-lg">🎤</span>
          <span className="font-semibold">Voice Chat</span>
        </div>
        <button
          onClick={toggleListening}
          className={`flex items-center gap-2 px-3 py-1.5 rounded-full text-sm font-medium transition ${
            isListening 
              ? "bg-red-500/20 text-red-400 animate-pulse" 
              : "bg-brand-pink/20 text-brand-pink hover:bg-brand-pink/30"
          }`}
        >
          <span className={`w-2 h-2 rounded-full ${isListening ? "bg-red-500" : "bg-brand-pink"}`} />
          {isListening ? "Listening..." : "Click to speak"}
        </button>
      </div>

      {/* Messages */}
      <div className="p-4 space-y-4 min-h-[200px] max-h-[300px] overflow-y-auto">
        {response && (
          <motion.div
            initial={{ opacity: 0, y: 10 }}
            animate={{ opacity: 1, y: 0 }}
            className="flex gap-3"
          >
            <div className="flex-shrink-0 w-8 h-8 rounded-full bg-brand-pink/20 flex items-center justify-center">
              👁️
            </div>
            <div className="flex-1 p-3 rounded-xl bg-white/10">
              <p className="text-sm">{response}</p>
            </div>
          </motion.div>
        )}
        
        {isProcessing && (
          <div className="flex items-center gap-2 text-white/50">
            <span className="animate-pulse">Processing...</span>
          </div>
        )}
      </div>

      {/* Input */}
      <div className="p-3 border-t border-white/10">
        <div className="flex gap-2">
          <input
            type="text"
            value={transcript}
            onChange={(e) => setTranscript(e.target.value)}
            onKeyPress={handleKeyPress}
            placeholder="Or type a message..."
            className="flex-1 bg-white/10 border border-white/20 rounded-lg px-3 py-2 text-sm text-white placeholder:text-white/40 focus:outline-none focus:border-brand-pink"
          />
          <button
            onClick={() => handleSend(transcript)}
            disabled={!transcript.trim() || isProcessing}
            className="px-4 py-2 bg-brand-pink rounded-lg text-sm font-medium disabled:opacity-50 disabled:cursor-not-allowed hover:bg-[#ff7bc0] transition"
          >
            Send
          </button>
        </div>
      </div>
    </div>
  );
}