import { useCallback, useEffect, useRef, useState } from 'react'
import type { PropertyPhoto } from '../../types/property'
import VideoPlayer from './VideoPlayer'

interface PhotoCarouselProps {
    photos: PropertyPhoto[]
    videoUrl?: string | null
}

function ChevronLeft() {
    return (
        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
            <polyline points="15 18 9 12 15 6" />
        </svg>
    )
}

function ChevronRight() {
    return (
        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
            <polyline points="9 18 15 12 9 6" />
        </svg>
    )
}

function NoPhotoPlaceholder() {
    return (
        <div className="w-full aspect-[16/9] bg-panel border border-white/5 rounded-xl flex flex-col items-center justify-center gap-3 text-textQuaternary">
            <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
                <rect x="3" y="3" width="18" height="18" rx="3" />
                <circle cx="8.5" cy="8.5" r="1.5" />
                <polyline points="21 15 16 10 5 21" />
            </svg>
            <span className="text-sm">Sem fotos disponíveis</span>
        </div>
    )
}

export default function PhotoCarousel({ photos, videoUrl }: PhotoCarouselProps) {
    const [activeIndex, setActiveIndex] = useState(0)
    const touchStartX = useRef<number | null>(null)
    const containerRef = useRef<HTMLDivElement>(null)
    const hasVideo = Boolean(videoUrl)
    const totalSlides = photos.length + (hasVideo ? 1 : 0)

    const prev = useCallback(() => {
        setActiveIndex((i) => (i === 0 ? totalSlides - 1 : i - 1))
    }, [totalSlides])

    const next = useCallback(() => {
        setActiveIndex((i) => (i === totalSlides - 1 ? 0 : i + 1))
    }, [totalSlides])

    useEffect(() => {
        const el = containerRef.current
        if (!el) return
        const handleKey = (e: KeyboardEvent) => {
            if (e.key === 'ArrowLeft') prev()
            else if (e.key === 'ArrowRight') next()
        }
        el.addEventListener('keydown', handleKey)
        return () => el.removeEventListener('keydown', handleKey)
    }, [prev, next])

    if (totalSlides === 0) return <NoPhotoPlaceholder />

    const isVideoSlide = hasVideo && activeIndex === 0
    const photoIndex = hasVideo ? activeIndex - 1 : activeIndex
    const active = !isVideoSlide ? photos[photoIndex] : null
    const single = totalSlides === 1

    return (
        <div ref={containerRef} className="w-full outline-none" tabIndex={0}>
            {/* Main slide */}
            <div className="relative w-full rounded-xl overflow-hidden bg-panel">
                {isVideoSlide ? (
                    <VideoPlayer url={videoUrl!} />
                ) : (
                    <div className="aspect-[16/9]">
                        <img
                            src={active!.url}
                            alt={active!.alt_text || `Foto ${activeIndex + 1}`}
                            className="w-full h-full object-cover transition-opacity duration-300"
                            loading="lazy"
                        />
                    </div>
                )}

                {/* Nav buttons */}
                {!single && (
                    <>
                        <button
                            onClick={prev}
                            aria-label="Foto anterior"
                            className="absolute left-3 top-1/2 -translate-y-1/2 w-9 h-9 rounded-full bg-black/50 backdrop-blur-sm border border-white/10 flex items-center justify-center text-white hover:bg-black/70 transition-colors"
                        >
                            <ChevronLeft />
                        </button>
                        <button
                            onClick={next}
                            aria-label="Próxima foto"
                            className="absolute right-3 top-1/2 -translate-y-1/2 w-9 h-9 rounded-full bg-black/50 backdrop-blur-sm border border-white/10 flex items-center justify-center text-white hover:bg-black/70 transition-colors"
                        >
                            <ChevronRight />
                        </button>

                        {/* Counter */}
                        <div className="absolute bottom-3 right-3 bg-black/60 backdrop-blur-sm rounded-full px-2.5 py-1 text-xs text-white/80">
                            {activeIndex + 1} / {totalSlides}
                        </div>
                    </>
                )}
            </div>

            {/* Thumbnail strip */}
            {!single && (
                <div
                    className="flex gap-2 mt-3 overflow-x-auto pb-1 scrollbar-thin"
                    onTouchStart={(e) => { touchStartX.current = e.touches[0].clientX }}
                    onTouchEnd={(e) => {
                        if (touchStartX.current === null) return
                        const delta = e.changedTouches[0].clientX - touchStartX.current
                        if (delta < -50) next()
                        else if (delta > 50) prev()
                        touchStartX.current = null
                    }}
                >
                    {hasVideo && (
                        <button
                            key="video-thumb"
                            onClick={() => setActiveIndex(0)}
                            aria-label="Ver vídeo"
                            aria-current={activeIndex === 0}
                            className={`flex-shrink-0 w-20 h-14 rounded-lg overflow-hidden border-2 transition-all duration-150 flex items-center justify-center bg-panel ${
                                activeIndex === 0
                                    ? 'border-accent-violet opacity-100'
                                    : 'border-transparent opacity-50 hover:opacity-75'
                            }`}
                        >
                            <svg
                                width="20"
                                height="20"
                                viewBox="0 0 24 24"
                                fill="currentColor"
                                className="text-white/70"
                                aria-hidden="true"
                            >
                                <path d="M8 5v14l11-7z" />
                            </svg>
                        </button>
                    )}
                    {photos.map((photo, idx) => {
                        const slideIdx = hasVideo ? idx + 1 : idx
                        return (
                            <button
                                key={idx}
                                onClick={() => setActiveIndex(slideIdx)}
                                aria-label={`Ver foto ${idx + 1}`}
                                aria-current={slideIdx === activeIndex}
                                className={`flex-shrink-0 w-20 h-14 rounded-lg overflow-hidden border-2 transition-all duration-150 ${
                                    slideIdx === activeIndex
                                        ? 'border-accent-violet opacity-100'
                                        : 'border-transparent opacity-50 hover:opacity-75'
                                }`}
                            >
                                <img
                                    src={photo.url}
                                    alt={photo.alt_text || `Miniatura ${idx + 1}`}
                                    className="w-full h-full object-cover"
                                    loading="lazy"
                                />
                            </button>
                        )
                    })}
                </div>
            )}
        </div>
    )
}