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'use client';

import { useState } from 'react';
import { X, Send, Loader2, MessageCircle } from 'lucide-react';
import clsx from 'clsx';
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';

interface AskQuestionModalProps {
    isOpen: boolean;
    onClose: () => void;
    context: string; // The original analyzed content
}

interface Message {
    role: 'user' | 'assistant';
    content: string;
}

export default function AskQuestionModal({ isOpen, onClose, context }: AskQuestionModalProps) {
    const [messages, setMessages] = useState<Message[]>([]);
    const [input, setInput] = useState('');
    const [loading, setLoading] = useState(false);

    const handleSubmit = async (e: React.FormEvent) => {
        e.preventDefault();
        if (!input.trim() || loading) return;

        const userMessage = input.trim();
        setInput('');
        setMessages(prev => [...prev, { role: 'user', content: userMessage }]);
        setLoading(true);

        try {
            const formData = new FormData();
            formData.append('text', `
Based on this content I just learned:
---
${context.substring(0, 2000)}
---

My question: ${userMessage}

Please answer my question in a helpful, educational way. Use simple language and examples if needed.
            `);

            const res = await fetch('/api/analyze', {
                method: 'POST',
                body: formData,
            });

            if (!res.ok) throw new Error('Failed to get response');

            const data = await res.json();
            const cleanResponse = data.result?.replace(/\[\[TOPICS?:.*?\]\]/gi, '').trim() || 'Sorry, I could not generate a response.';

            setMessages(prev => [...prev, { role: 'assistant', content: cleanResponse }]);
        } catch (error) {
            setMessages(prev => [...prev, { role: 'assistant', content: 'Sorry, something went wrong. Please try again.' }]);
        } finally {
            setLoading(false);
        }
    };

    if (!isOpen) return null;

    return (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/50 backdrop-blur-sm animate-fade-in-up">
            <div className="w-full max-w-2xl bg-white dark:bg-neutral-900 rounded-2xl shadow-2xl border border-gray-200 dark:border-neutral-800 flex flex-col max-h-[80vh]">

                {/* Header */}
                <div className="flex items-center justify-between p-4 border-b border-gray-200 dark:border-neutral-800">
                    <div className="flex items-center gap-2">
                        <MessageCircle size={20} className="text-sky-500" />
                        <h2 className="text-lg font-semibold text-gray-900 dark:text-white">Ask a Question</h2>
                    </div>
                    <button
                        onClick={onClose}
                        className="p-2 hover:bg-gray-100 dark:hover:bg-neutral-800 rounded-full transition-colors"
                    >
                        <X size={20} className="text-gray-500" />
                    </button>
                </div>

                {/* Messages */}
                <div className="flex-1 overflow-y-auto p-4 space-y-4">
                    {messages.length === 0 && (
                        <div className="text-center py-12 text-gray-400">
                            <MessageCircle size={48} className="mx-auto mb-4 opacity-50" />
                            <p>Ask any question about the content you just analyzed.</p>
                        </div>
                    )}

                    {messages.map((msg, idx) => (
                        <div
                            key={idx}
                            className={clsx(
                                "flex",
                                msg.role === 'user' ? "justify-end" : "justify-start"
                            )}
                        >
                            <div
                                className={clsx(
                                    "max-w-[80%] rounded-2xl px-4 py-3",
                                    msg.role === 'user'
                                        ? "bg-sky-500 text-white rounded-br-md"
                                        : "bg-gray-100 dark:bg-neutral-800 text-gray-800 dark:text-gray-200 rounded-bl-md"
                                )}
                            >
                                {msg.role === 'assistant' ? (
                                    <div className="prose prose-sm dark:prose-invert max-w-none">
                                        <ReactMarkdown remarkPlugins={[remarkGfm]}>
                                            {msg.content}
                                        </ReactMarkdown>
                                    </div>
                                ) : (
                                    <p>{msg.content}</p>
                                )}
                            </div>
                        </div>
                    ))}

                    {loading && (
                        <div className="flex justify-start">
                            <div className="bg-gray-100 dark:bg-neutral-800 rounded-2xl rounded-bl-md px-4 py-3">
                                <Loader2 size={20} className="animate-spin text-gray-400" />
                            </div>
                        </div>
                    )}
                </div>

                {/* Input */}
                <form onSubmit={handleSubmit} className="p-4 border-t border-gray-200 dark:border-neutral-800">
                    <div className="flex gap-3">
                        <input
                            type="text"
                            value={input}
                            onChange={(e) => setInput(e.target.value)}
                            placeholder="Type your question..."
                            className="flex-1 px-4 py-3 bg-gray-100 dark:bg-neutral-800 border border-gray-200 dark:border-neutral-700 rounded-xl focus:outline-none focus:ring-2 focus:ring-sky-500 focus:border-transparent text-gray-900 dark:text-white placeholder-gray-400"
                            disabled={loading}
                        />
                        <button
                            type="submit"
                            disabled={loading || !input.trim()}
                            className={clsx(
                                "px-4 py-3 rounded-xl font-medium transition-all flex items-center gap-2",
                                loading || !input.trim()
                                    ? "bg-gray-200 dark:bg-neutral-700 text-gray-400 cursor-not-allowed"
                                    : "bg-sky-500 text-white hover:bg-sky-600"
                            )}
                        >
                            {loading ? <Loader2 size={18} className="animate-spin" /> : <Send size={18} />}
                        </button>
                    </div>
                </form>
            </div>
        </div>
    );
}