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import React, { useState, useRef, useEffect } from "react";
import { trpc } from "@/lib/trpc";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Textarea } from "@/components/ui/textarea";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Badge } from "@/components/ui/badge";
import { Copy, Download, Send, Bot, User, Loader2 } from "lucide-react";
import { toast } from "sonner";

interface Message {
  id: string;
  role: "user" | "assistant";
  content: string;
  timestamp: string;
  mode?: string;
}

export default function ChatInterface() {
  const [messages, setMessages] = useState<Message[]>([]);
  const [input, setInput] = useState("");
  const [mode, setMode] = useState("auto");
  const [contentType, setContentType] = useState("code");
  const [isLoading, setIsLoading] = useState(false);
  const messagesEndRef = useRef<HTMLDivElement>(null);

  const sendMutation = trpc.chat.sendMessage.useMutation({
    onSuccess: (data) => {
      setMessages((prev) => [
        ...prev,
        {
          id: Date.now().toString(),
          role: "assistant",
          content: data.content,
          timestamp: new Date().toLocaleTimeString(),
          mode: data.mode,
        },
      ]);
      setIsLoading(false);
    },
    onError: (error) => {
      toast.error("Failed to send message: " + error.message);
      setIsLoading(false);
    },
  });

  const scrollToBottom = () => {
    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
  };

  useEffect(() => {
    scrollToBottom();
  }, [messages]);

  const handleSend = async () => {
    if (!input.trim()) return;

    const userMessage: Message = {
      id: Date.now().toString(),
      role: "user",
      content: input,
      timestamp: new Date().toLocaleTimeString(),
    };

    setMessages((prev) => [...prev, userMessage]);
    setInput("");
    setIsLoading(true);

    await sendMutation.mutateAsync({
      message: input,
      mode: mode as any,
      contentType: contentType as any,
    });
  };

  const copyToClipboard = (text: string) => {
    navigator.clipboard.writeText(text);
    toast.success("Copied to clipboard!");
  };

  return (
    <div className="min-h-screen bg-black text-white">
      {/* Header */}
      <header className="border-b border-cyan-500/20 bg-black/50 backdrop-blur-sm sticky top-0 z-40">
        <div className="container mx-auto px-4 py-4">
          <h1 className="text-2xl font-bold bg-gradient-to-r from-cyan-400 to-blue-500 bg-clip-text text-transparent">
            AI Code Generator & Evaluator
          </h1>
        </div>
      </header>

      <main className="container mx-auto px-4 py-6">
        <div className="grid grid-cols-1 lg:grid-cols-4 gap-6">
          {/* Chat Area */}
          <div className="lg:col-span-3 space-y-4">
            {/* Messages */}
            <Card className="bg-gray-900/50 border-cyan-500/20 flex flex-col h-96">
              <CardContent className="flex-1 overflow-y-auto p-4 space-y-4">
                {messages.length === 0 ? (
                  <div className="h-full flex items-center justify-center text-gray-500">
                    <div className="text-center">
                      <Bot size={48} className="mx-auto mb-4 opacity-50" />
                      <p>Start a conversation with the AI</p>
                    </div>
                  </div>
                ) : (
                  messages.map((msg) => (
                    <div
                      key={msg.id}
                      className={`flex gap-3 ${msg.role === "user" ? "justify-end" : "justify-start"}`}
                    >
                      {msg.role === "assistant" && (
                        <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-cyan-400 to-blue-500 flex items-center justify-center flex-shrink-0">
                          <Bot size={16} className="text-black" />
                        </div>
                      )}
                      <div
                        className={`max-w-xs lg:max-w-md px-4 py-2 rounded-lg ${
                          msg.role === "user"
                            ? "bg-green-500/20 border border-green-500/50 text-green-100"
                            : "bg-cyan-500/20 border border-cyan-500/50 text-cyan-100"
                        }`}
                      >
                        <p className="text-sm break-words">{msg.content}</p>
                        {msg.role === "assistant" && (
                          <div className="flex gap-2 mt-2">
                            <Button
                              size="sm"
                              variant="ghost"
                              className="h-6 px-2 text-xs"
                              onClick={() => copyToClipboard(msg.content)}
                            >
                              <Copy size={12} />
                            </Button>
                            <Button size="sm" variant="ghost" className="h-6 px-2 text-xs">
                              <Download size={12} />
                            </Button>
                          </div>
                        )}
                      </div>
                      {msg.role === "user" && (
                        <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-green-400 to-emerald-500 flex items-center justify-center flex-shrink-0">
                          <User size={16} className="text-black" />
                        </div>
                      )}
                    </div>
                  ))
                )}
                {isLoading && (
                  <div className="flex gap-3">
                    <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-cyan-400 to-blue-500 flex items-center justify-center">
                      <Loader2 size={16} className="text-black animate-spin" />
                    </div>
                    <div className="bg-cyan-500/20 border border-cyan-500/50 px-4 py-2 rounded-lg">
                      <p className="text-sm text-cyan-100">Processing...</p>
                    </div>
                  </div>
                )}
                <div ref={messagesEndRef} />
              </CardContent>
            </Card>

            {/* Input Area */}
            <Card className="bg-gray-900/50 border-cyan-500/20">
              <CardContent className="p-4 space-y-4">
                <Textarea
                  placeholder="Enter your code generation or evaluation request..."
                  value={input}
                  onChange={(e) => setInput(e.target.value)}
                  onKeyDown={(e) => {
                    if (e.key === "Enter" && e.ctrlKey) {
                      handleSend();
                    }
                  }}
                  className="bg-black/50 border-green-500/20 text-white placeholder-gray-500 focus:border-green-500/50 min-h-24"
                />
                <div className="flex gap-2">
                  <Button
                    onClick={handleSend}
                    disabled={isLoading || !input.trim()}
                    className="bg-gradient-to-r from-cyan-500 to-blue-500 text-black hover:from-cyan-600 hover:to-blue-600 flex-1"
                  >
                    <Send size={18} className="mr-2" />
                    Send
                  </Button>
                </div>
              </CardContent>
            </Card>
          </div>

          {/* Sidebar */}
          <div className="space-y-4">
            {/* Mode Selection */}
            <Card className="bg-gray-900/50 border-green-500/20">
              <CardHeader>
                <CardTitle className="text-green-400 text-sm">Mode</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <Select value={mode} onValueChange={setMode}>
                  <SelectTrigger className="bg-black/50 border-green-500/20 text-white">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent className="bg-gray-900 border-green-500/20">
                    <SelectItem value="auto">Auto</SelectItem>
                    <SelectItem value="qwen">Qwen (Generate)</SelectItem>
                    <SelectItem value="deepseek">DeepSeek (Evaluate)</SelectItem>
                    <SelectItem value="loop">Loop (Iterative)</SelectItem>
                  </SelectContent>
                </Select>
              </CardContent>
            </Card>

            {/* Content Type */}
            <Card className="bg-gray-900/50 border-purple-500/20">
              <CardHeader>
                <CardTitle className="text-purple-400 text-sm">Content Type</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2">
                <Select value={contentType} onValueChange={setContentType}>
                  <SelectTrigger className="bg-black/50 border-purple-500/20 text-white">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent className="bg-gray-900 border-purple-500/20">
                    <SelectItem value="code">Code</SelectItem>
                    <SelectItem value="exploit">Exploit</SelectItem>
                    <SelectItem value="payload">Payload</SelectItem>
                    <SelectItem value="information">Information</SelectItem>
                    <SelectItem value="strategy">Strategy</SelectItem>
                  </SelectContent>
                </Select>
              </CardContent>
            </Card>

            {/* Stats */}
            <Card className="bg-gray-900/50 border-orange-500/20">
              <CardHeader>
                <CardTitle className="text-orange-400 text-sm">Session Stats</CardTitle>
              </CardHeader>
              <CardContent className="space-y-2 text-sm">
                <div className="flex justify-between">
                  <span className="text-gray-400">Messages:</span>
                  <span className="text-orange-400 font-bold">{messages.length}</span>
                </div>
                <div className="flex justify-between">
                  <span className="text-gray-400">Mode:</span>
                  <Badge className="bg-green-500/20 text-green-400">{mode}</Badge>
                </div>
              </CardContent>
            </Card>
          </div>
        </div>
      </main>
    </div>
  );
}