'use client'
import { useState, useEffect } from 'react'
import { createPortal } from 'react-dom'
import Image from 'next/image'

export default function ImageGallery({ images }: { images: string[] }) {
  // activeIdx = which thumbnail is highlighted in the strip
  const [activeIdx, setActiveIdx] = useState(0)
  // lightboxIdx = null means closed; a number = open at that image
  const [lightboxIdx, setLightboxIdx] = useState<number | null>(null)
  // portal guard: document.body only available client-side
  const [mounted, setMounted] = useState(false)

  useEffect(() => { setMounted(true) }, [])

  // Keyboard navigation for lightbox (←  →  Esc)
  useEffect(() => {
    if (lightboxIdx === null) return
    const handler = (e: KeyboardEvent) => {
      if (e.key === 'ArrowLeft')  lbGo((lightboxIdx - 1 + images.length) % images.length)
      if (e.key === 'ArrowRight') lbGo((lightboxIdx + 1) % images.length)
      if (e.key === 'Escape')     setLightboxIdx(null)
    }
    window.addEventListener('keydown', handler)
    return () => window.removeEventListener('keydown', handler)
  }, [lightboxIdx, images.length]) // eslint-disable-line react-hooks/exhaustive-deps

  if (!images.length) return null

  // Navigate lightbox AND keep strip highlight in sync
  const lbGo = (idx: number) => { setLightboxIdx(idx); setActiveIdx(idx) }

  // Strip-only prev/next (highlight moves, lightbox stays closed)
  const stripPrev = (e: React.MouseEvent) => {
    e.stopPropagation()
    setActiveIdx(i => (i - 1 + images.length) % images.length)
  }
  const stripNext = (e: React.MouseEvent) => {
    e.stopPropagation()
    setActiveIdx(i => (i + 1) % images.length)
  }

  // Lightbox arrow handlers
  const lbPrev = (e: React.MouseEvent) => {
    e.stopPropagation()
    if (lightboxIdx !== null) lbGo((lightboxIdx - 1 + images.length) % images.length)
  }
  const lbNext = (e: React.MouseEvent) => {
    e.stopPropagation()
    if (lightboxIdx !== null) lbGo((lightboxIdx + 1) % images.length)
  }

  // ── Lightbox portal ──────────────────────────────────────────────────────
  // Rendered via createPortal so it escapes the panel's z-50 stacking context.
  // Sized & positioned identically to the detail panel (w-96 h-full fixed right-0 top-0).
  const lightbox = lightboxIdx !== null && mounted
    ? createPortal(
        // Semi-transparent backdrop — clicking it closes the lightbox
        <div
          className="fixed inset-0 z-[100] flex items-stretch justify-end"
          style={{ background: 'rgba(0,0,0,0.5)' }}
          onClick={() => setLightboxIdx(null)}
        >
          {/* Inner panel — same w-96 as the detail panel */}
          <div
            className="h-full w-96 border-l border-ghost-accent flex flex-col"
            style={{ background: 'var(--color-ghost-bg)' }}
            onClick={e => e.stopPropagation()}
          >
            {/* Header */}
            <div className="flex items-center justify-between px-4 py-3 border-b border-ghost-border shrink-0">
              <span className="font-mono text-ghost-dim text-xs tracking-widest">
                IMAGE {lightboxIdx + 1} / {images.length}
              </span>
              <button
                onClick={() => setLightboxIdx(null)}
                className="text-ghost-dim hover:text-ghost-danger font-mono text-xs transition-colors"
              >
                ✕ CLOSE
              </button>
            </div>

            {/* Full-size image */}
            <div className="flex-1 flex items-center justify-center p-4 overflow-hidden">
              {/* eslint-disable-next-line @next/next/no-img-element */}
              <img
                src={images[lightboxIdx]}
                alt={`Lot image ${lightboxIdx + 1}`}
                className="max-w-full max-h-full object-contain rounded"
              />
            </div>

            {/* Footer — arrows + dot indicators */}
            {images.length > 1 && (
              <div className="flex items-center justify-between px-4 py-3 border-t border-ghost-border shrink-0">
                <button
                  onClick={lbPrev}
                  className="font-mono text-ghost-accent hover:text-ghost-text text-sm transition-colors px-2 py-1"
                >
                  ‹ PREV
                </button>

                {/* Dot indicators — click to jump */}
                <div className="flex gap-1.5 items-center">
                  {images.map((_, i) => (
                    <button
                      key={i}
                      onClick={() => lbGo(i)}
                      className={`rounded-full transition-all ${
                        i === lightboxIdx
                          ? 'w-3 h-3 bg-ghost-accent'
                          : 'w-2 h-2 bg-ghost-border hover:bg-ghost-dim'
                      }`}
                    />
                  ))}
                </div>

                <button
                  onClick={lbNext}
                  className="font-mono text-ghost-accent hover:text-ghost-text text-sm transition-colors px-2 py-1"
                >
                  NEXT ›
                </button>
              </div>
            )}
          </div>
        </div>,
        document.body
      )
    : null

  // ── Thumbnail strip ──────────────────────────────────────────────────────
  return (
    <>
      <div>
        <div className="text-ghost-dim text-xs font-mono mb-2">LOT IMAGES</div>

        {/* Strip: ‹ [thumbnails] › */}
        <div className="flex items-center gap-1">
          {images.length > 1 && (
            <button
              onClick={stripPrev}
              title="Previous image"
              className="text-ghost-dim hover:text-ghost-accent font-mono text-xl leading-none px-0.5 shrink-0 transition-colors"
            >
              ‹
            </button>
          )}

          <div className="flex gap-2 overflow-x-auto flex-1 pb-1">
            {images.map((src, i) => (
              <button
                key={i}
                onClick={() => { setActiveIdx(i); setLightboxIdx(i) }}
                title={`Open image ${i + 1}`}
                className={`shrink-0 rounded transition-all border-2 ${
                  i === activeIdx
                    ? 'border-ghost-accent scale-105'
                    : 'border-ghost-border hover:border-ghost-dim'
                }`}
              >
                <Image
                  src={src}
                  alt={`Lot image ${i + 1}`}
                  width={100}
                  height={80}
                  className="object-cover rounded"
                  onError={e => {
                    const parent = e.currentTarget.parentElement
                    if (parent) parent.style.display = 'none'
                  }}
                />
              </button>
            ))}
          </div>

          {images.length > 1 && (
            <button
              onClick={stripNext}
              title="Next image"
              className="text-ghost-dim hover:text-ghost-accent font-mono text-xl leading-none px-0.5 shrink-0 transition-colors"
            >
              ›
            </button>
          )}
        </div>
      </div>

      {/* Lightbox rendered at document.body via portal */}
      {lightbox}
    </>
  )
}