"use client";

import { useState, useEffect } from "react";
import { useTranslation } from "@/app/hooks/useTranslation";
import ReadyToJoin from "./ReadyToJoin";

const BASE = process.env.NEXT_PUBLIC_BASE_PATH || "";

type EventItem = {
  id: number;
  title: string;
  location: string;
  date: string;
  description: string;
  images: string[];
};

export default function GalleryPageClient() {
  const { gallery } = useTranslation();
  
  // Lightbox State
  const [lightboxEventId, setLightboxEventId] = useState<number | null>(null);
  const [lightboxImageIndex, setLightboxImageIndex] = useState<number | null>(null);

  // Helper to format image source path
  const getImgSrc = (src: string) => {
    if (src.startsWith("http")) return src;
    return `${BASE}${src}`;
  };

  // Keyboard navigation for Lightbox
  useEffect(() => {
    if (lightboxEventId === null || lightboxImageIndex === null) return;

    const activeEvent = gallery.events.find((e: EventItem) => e.id === lightboxEventId);
    if (!activeEvent) return;

    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape") {
        closeLightbox();
      } else if (e.key === "ArrowRight") {
        setLightboxImageIndex((prev) => (prev! + 1) % activeEvent.images.length);
      } else if (e.key === "ArrowLeft") {
        setLightboxImageIndex((prev) => (prev! - 1 + activeEvent.images.length) % activeEvent.images.length);
      }
    };

    window.addEventListener("keydown", handleKeyDown);
    return () => {
      window.removeEventListener("keydown", handleKeyDown);
    };
  }, [lightboxEventId, lightboxImageIndex, gallery.events]);

  const openLightbox = (eventId: number, imgIndex: number) => {
    setLightboxEventId(eventId);
    setLightboxImageIndex(imgIndex);
    document.body.style.overflow = "hidden";
  };

  const closeLightbox = () => {
    setLightboxEventId(null);
    setLightboxImageIndex(null);
    document.body.style.overflow = "";
  };

  // Find active lightbox image and event
  const activeEvent = lightboxEventId !== null 
    ? gallery.events.find((e: EventItem) => e.id === lightboxEventId)
    : null;
  const activeImage = activeEvent && lightboxImageIndex !== null
    ? activeEvent.images[lightboxImageIndex]
    : null;

  return (
    <main className="pt-16 lg:pt-20 min-h-screen bg-background text-on-surface">
      {/* Hero Header */}
      <section className="hero-glow py-20 lg:py-32 px-[var(--spacing-gutter)] text-center">
        <div className="max-w-4xl mx-auto">
          <span className="font-[var(--font-label-caps)] text-xs lg:text-sm text-primary block mb-4 lg:mb-6 tracking-[0.25em] uppercase">
            {gallery.hero.eyebrow}
          </span>
          <h1 className="font-[var(--font-display-lg)] text-on-surface text-[clamp(2.5rem,6vw+1rem,5.5rem)] leading-none tracking-tight">
            {gallery.hero.title}
          </h1>
          <p className="font-[var(--font-body-base)] text-on-surface-variant text-base lg:text-[20px] max-w-3xl mx-auto opacity-70 leading-relaxed mt-6">
            {gallery.hero.description}
          </p>
        </div>
      </section>

      {/* Visual Gallery section */}
      <section className="py-12 lg:py-20 px-[var(--spacing-gutter)] max-w-hd mx-auto">
        <div className="flex flex-col gap-16 lg:gap-24">
          {gallery.events.map((event: EventItem) => (
            <div 
              key={event.id}
              className="glass-panel p-6 sm:p-8 lg:p-12 rounded-3xl border border-primary/20 hover:border-primary/40 shadow-xl transition-all duration-300"
            >
              {/* Event details */}
              <div className="flex flex-col lg:flex-row lg:items-start lg:justify-between mb-8 gap-4">
                <div className="max-w-2xl">
                  <h2 className="text-xl sm:text-2xl lg:text-3xl font-[var(--font-display-lg)] text-primary mb-3">
                    {event.title}
                  </h2>
                  <p className="text-sm sm:text-base text-on-surface-variant/80 leading-relaxed font-sans">
                    {event.description}
                  </p>
                </div>
                
                {/* Meta details */}
                <div className="flex flex-wrap items-center gap-4 lg:self-start lg:mt-2 text-xs uppercase tracking-wider text-on-surface-variant/60 font-[var(--font-label-caps)]">
                  <div className="flex items-center gap-1.5 bg-surface-container-high px-3 py-1.5 rounded-lg border border-white/5">
                    <span className="material-symbols-outlined text-base text-primary">location_on</span>
                    <span>{event.location}</span>
                  </div>
                  <div className="flex items-center gap-1.5 bg-surface-container-high px-3 py-1.5 rounded-lg border border-white/5">
                    <span className="material-symbols-outlined text-base text-primary">calendar_today</span>
                    <span>{event.date}</span>
                  </div>
                </div>
              </div>

              {/* Collage gallery grid */}
              <div className="grid grid-cols-1 md:grid-cols-3 gap-4 lg:gap-6">
                {/* Large image (left) */}
                <div 
                  className="md:col-span-2 overflow-hidden rounded-2xl border border-white/10 group cursor-pointer relative h-[240px] sm:h-[320px] md:h-[360px]"
                  onClick={() => openLightbox(event.id, 0)}
                >
                  {/* eslint-disable-next-line @next/next/no-img-element */}
                  <img 
                    src={getImgSrc(event.images[0])} 
                    alt={`${event.title} Highlight 1`} 
                    className="w-full h-full object-cover transition-transform duration-700 group-hover:scale-105"
                    loading="lazy"
                  />
                  <div className="absolute inset-0 bg-black/40 opacity-0 group-hover:opacity-100 transition-opacity duration-300 flex items-center justify-center">
                    <div className="w-12 h-12 rounded-full bg-primary/20 backdrop-blur-md flex items-center justify-center border border-primary/50 text-white">
                      <span className="material-symbols-outlined text-2xl">zoom_in</span>
                    </div>
                  </div>
                </div>

                {/* Stacked images (right) */}
                <div className="flex flex-col gap-4 lg:gap-6">
                  {event.images.slice(1, 3).map((imgUrl, i) => (
                    <div 
                      key={i}
                      className="flex-1 overflow-hidden rounded-2xl border border-white/10 group cursor-pointer relative h-[180px] sm:h-[220px] md:h-[168px] lg:h-[168px]"
                      onClick={() => openLightbox(event.id, i + 1)}
                    >
                      {/* eslint-disable-next-line @next/next/no-img-element */}
                      <img 
                        src={getImgSrc(imgUrl)} 
                        alt={`${event.title} Highlight ${i + 2}`} 
                        className="w-full h-full object-cover transition-transform duration-700 group-hover:scale-105"
                        loading="lazy"
                      />
                      <div className="absolute inset-0 bg-black/40 opacity-0 group-hover:opacity-100 transition-opacity duration-300 flex items-center justify-center">
                        <div className="w-10 h-10 rounded-full bg-primary/20 backdrop-blur-md flex items-center justify-center border border-primary/50 text-white">
                          <span className="material-symbols-outlined text-xl">zoom_in</span>
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              </div>
            </div>
          ))}
        </div>
      </section>

      {/* Invitation Section */}
      <ReadyToJoin data={gallery.join} />

      {/* Lightbox Overlay */}
      {lightboxEventId !== null && lightboxImageIndex !== null && activeEvent && activeImage && (
        <div 
          className="fixed inset-0 z-[100] flex flex-col justify-center items-center bg-black/95 backdrop-blur-md transition-opacity duration-300"
          onClick={closeLightbox}
        >
          {/* Close button */}
          <button 
            type="button" 
            className="absolute top-6 right-6 text-white/70 hover:text-white transition-colors p-2 z-[110]"
            onClick={closeLightbox}
            aria-label="Close Lightbox"
          >
            <span className="material-symbols-outlined text-4xl">close</span>
          </button>

          {/* Lightbox content container */}
          <div 
            className="relative flex items-center justify-between w-full max-w-6xl px-4 md:px-12 h-[60vh] sm:h-[70vh] md:h-[80vh]"
            onClick={(e) => e.stopPropagation()}
          >
            {/* Prev arrow */}
            <button 
              type="button"
              className="w-12 h-12 md:w-16 md:h-16 rounded-full bg-white/5 hover:bg-white/10 border border-white/10 text-white flex items-center justify-center transition-colors mr-2 active:scale-95"
              onClick={() => setLightboxImageIndex((prev) => (prev! - 1 + activeEvent.images.length) % activeEvent.images.length)}
              aria-label="Previous Image"
            >
              <span className="material-symbols-outlined text-2xl md:text-3xl">chevron_left</span>
            </button>

            {/* Active Image */}
            <div className="flex-1 flex items-center justify-center h-full relative overflow-hidden select-none px-4">
              {/* eslint-disable-next-line @next/next/no-img-element */}
              <img 
                src={getImgSrc(activeImage)} 
                alt={`${activeEvent.title} Full Highlight`}
                className="max-w-full max-h-full object-contain rounded-lg border border-white/5 shadow-2xl transition-all duration-300 animate-in fade-in zoom-in-95 duration-200"
              />
            </div>

            {/* Next arrow */}
            <button 
              type="button"
              className="w-12 h-12 md:w-16 md:h-16 rounded-full bg-white/5 hover:bg-white/10 border border-white/10 text-white flex items-center justify-center transition-colors ml-2 active:scale-95"
              onClick={() => setLightboxImageIndex((prev) => (prev! + 1) % activeEvent.images.length)}
              aria-label="Next Image"
            >
              <span className="material-symbols-outlined text-2xl md:text-3xl">chevron_right</span>
            </button>
          </div>

          {/* Info bar below image */}
          <div 
            className="text-center mt-6 px-6 max-w-2xl select-none"
            onClick={(e) => e.stopPropagation()}
          >
            <h3 className="font-[var(--font-display-lg)] text-primary text-base sm:text-lg mb-1.5">
              {activeEvent.title}
            </h3>
            <p className="text-on-surface-variant/60 text-xs sm:text-sm uppercase tracking-wider font-[var(--font-label-caps)]">
              {useTranslation().lang === "vi" 
                ? `Hình ảnh ${lightboxImageIndex + 1} trên ${activeEvent.images.length}`
                : `Image ${lightboxImageIndex + 1} of ${activeEvent.images.length}`
              }
            </p>
          </div>
        </div>
      )}
    </main>
  );
}