"use client";

import { useState, useMemo } from "react";

interface FillInTheBlanksPlayerProps {
    id: string;
    title?: string;
    content: string;
    allowRetry?: boolean;
}

export default function FillInTheBlanksPlayer({ id, title, content, allowRetry = true }: FillInTheBlanksPlayerProps) {
    const [userAnswers, setUserAnswers] = useState<string[]>([]);
    const [submitted, setSubmitted] = useState(false);

    // Parse content to find blanks
    const parsed = useMemo(() => {
        const parts: { type: 'text' | 'blank'; value?: string; index?: number; answer?: string }[] = [];
        const answers: string[] = [];
        let lastIndex = 0;
        const regex = /\[\[(.*?)\]\]/g;
        let match;

        while ((match = regex.exec(content)) !== null) {
            parts.push({ type: 'text', value: content.substring(lastIndex, match.index) });
            const answer = match[1];
            parts.push({ type: 'blank', index: answers.length, answer });
            answers.push(answer);
            lastIndex = regex.lastIndex;
        }
        parts.push({ type: 'text', value: content.substring(lastIndex) });

        return { parts, answers };
    }, [content]);

    const handleReset = () => {
        setSubmitted(false);
        setUserAnswers([]);
    };

    const isCorrect = (index: number) => {
        return userAnswers[index]?.trim().toLowerCase() === parsed.answers[index]?.trim().toLowerCase();
    };

    return (
        <div className="space-y-8" id={id}>
            <div className="space-y-2">
                <h3 className="text-xl font-bold border-l-4 border-blue-600 dark:border-blue-500 pl-4 py-1 tracking-tight text-gray-900 dark:text-white uppercase tracking-widest text-[10px]">
                    {title || "Rellena los Espacios en Blanco"}
                </h3>
            </div>

            <div className="p-8 glass border-black/5 dark:border-white/5 rounded-3xl space-y-8 bg-black/[0.02] dark:bg-black/20">
                <div className="text-lg leading-loose text-gray-800 dark:text-gray-100">
                    {parsed.parts.map((part, i) => (
                        part.type === 'text' ? (
                            <span key={i}>{part.value}</span>
                        ) : (
                            <input
                                key={i}
                                type="text"
                                value={userAnswers[part.index!] || ""}
                                onChange={(e) => {
                                    const newAnswers = [...userAnswers];
                                    newAnswers[part.index!] = e.target.value;
                                    setUserAnswers(newAnswers);
                                }}
                                disabled={submitted}
                                className={`mx-1 px-2 py-0 border-b-2 bg-transparent transition-all focus:outline-none text-center rounded-t-sm ${submitted
                                    ? (isCorrect(part.index!) ? "border-green-600 dark:border-green-500 text-green-700 dark:text-green-400 bg-green-500/10" : "border-red-600 dark:border-red-500 text-red-700 dark:text-red-100 bg-red-500/10")
                                    : "border-blue-600/30 dark:border-blue-500/30 focus:border-blue-600 dark:focus:border-blue-500 text-blue-700 dark:text-blue-400 focus:bg-blue-600/5 dark:focus:bg-blue-500/5"
                                    }`}
                                style={{ width: `${Math.max((part.answer?.length || 5) * 12, 60)}px` }}
                                placeholder="..."
                            />
                        )
                    ))}
                </div>

                {allowRetry && (
                    <>
                        {!submitted && parsed.answers.length > 0 && (
                            <button
                                onClick={() => setSubmitted(true)}
                                className="btn-premium w-full py-5 font-black text-xs uppercase tracking-[0.2em] shadow-xl shadow-blue-500/20"
                            >
                                Validar Respuestas
                            </button>
                        )}

                        {submitted && (
                            <button
                                onClick={handleReset}
                                className="w-full py-5 glass text-blue-600 dark:text-blue-400 font-black text-xs uppercase tracking-[0.2em] hover:bg-black/5 dark:hover:bg-white/5 transition-all rounded-3xl border-black/5 dark:border-white/5"
                            >
                                Intentar de Nuevo
                            </button>
                        )}
                    </>
                )}
            </div>
        </div>
    );
}