'use client';

import React, { useRef, useState } from 'react';

interface CarouselItem {
    title: string;
    content: string;
    icon?: React.ReactNode;
}

interface CarouselProps {
    items: CarouselItem[];
    className?: string;
}

export const Carousel: React.FC<CarouselProps> = ({ items, className = '' }) => {
    const scrollRef = useRef<HTMLDivElement>(null);
    const [activeIndex, setActiveIndex] = useState(0);

    const scrollTo = (index: number) => {
        if (!scrollRef.current) return;
        const width = scrollRef.current.clientWidth;
        scrollRef.current.scrollTo({ left: index * width, behavior: 'smooth' });
        setActiveIndex(index);
    };

    const handleScroll = () => {
        if (!scrollRef.current) return;
        const width = scrollRef.current.clientWidth;
        const index = Math.round(scrollRef.current.scrollLeft / width);
        if (index !== activeIndex) setActiveIndex(index);
    };

    // Icons helper (default icon if none provided)
    const DefaultIcon = () => (
        <svg className="w-6 h-6 text-slate-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 10V3L4 14h7v7l9-11h-7z" />
        </svg>
    );

    return (
        <div className={`not-prose my-16 px-12 md:px-16 ${className}`}>
            <div className="relative group">
                {/* Scroll Container */}
                <div
                    ref={scrollRef}
                    onScroll={handleScroll}
                    className="flex overflow-x-auto snap-x snap-mandatory scrollbar-hide rounded-2xl border border-slate-200 bg-slate-50 gap-4 p-4"
                    style={{ scrollbarWidth: 'none', msOverflowStyle: 'none' }}
                >
                    {(items || []).map((item, index) => (
                        <div
                            key={index}
                            className="min-w-[85%] md:min-w-[45%] snap-center p-8 md:p-10 flex flex-col gap-6 items-start bg-white rounded-xl border border-slate-100 shadow-sm"
                        >
                            <div className="flex-shrink-0 w-12 h-12 bg-slate-50 rounded-xl border border-slate-100 flex items-center justify-center">
                                {item.icon || <DefaultIcon />}
                            </div>
                            <div className="flex-1">
                                <h4 className="text-lg font-bold text-slate-900 mb-2">{item.title}</h4>
                                {item.content && (
                                    <p className="text-sm text-slate-600 leading-relaxed m-0">{item.content}</p>
                                )}
                            </div>
                        </div>
                    ))}
                </div>

                {/* Nav Buttons (Outside) */}
                <button
                    onClick={() => scrollTo(Math.max(0, activeIndex - 1))}
                    disabled={activeIndex === 0}
                    className="absolute -left-12 md:-left-16 top-1/2 -translate-y-1/2 p-3 bg-white rounded-full shadow-sm border border-slate-200 text-slate-600 hover:text-slate-900 disabled:opacity-30 transition-all hidden md:block"
                >
                    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></svg>
                </button>
                <button
                    onClick={() => scrollTo(Math.min((items?.length || 0) - 1, activeIndex + 1))}
                    disabled={activeIndex === (items?.length || 0) - 1}
                    className="absolute -right-12 md:-right-16 top-1/2 -translate-y-1/2 p-3 bg-white rounded-full shadow-sm border border-slate-200 text-slate-600 hover:text-slate-900 disabled:opacity-30 transition-all hidden md:block"
                >
                    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><line x1="5" y1="12" x2="19" y2="12"></line><polyline points="12 5 19 12 12 19"></polyline></svg>
                </button>
            </div>

            {/* Dots */}
            <div className="flex justify-center mt-6 gap-3">
                {(items || []).map((_, index) => (
                    <button
                        key={index}
                        onClick={() => scrollTo(index)}
                        className={`h-1.5 transition-all duration-300 rounded-full ${index === activeIndex ? 'w-8 bg-slate-900' : 'w-2 bg-slate-200 hover:bg-slate-300'
                            }`}
                        aria-label={`Go to slide ${index + 1}`}
                    />
                ))}
            </div>
        </div>
    );
};