"use client";

import { motion } from "framer-motion";
import { ExternalLink, Calendar, ArrowLeft, Github as GithubIcon, Share2, Code } from "lucide-react";
import Link from "next/link";
import { useEffect, useState } from "react";
import ReactMarkdown from "react-markdown";
import { useTranslations } from "next-intl";
import Image from "next/image";
import { useRouter } from "next/navigation";

export type ProjectDetailData = {
  id: number;
  slug: string;
  title: string;
  description: string;
  content: string;
  tags: string[];
  featured: boolean;
  category: string;
  date: string;
  github?: string | null;
  live?: string | null;
  button_live_label?: string | null;
  button_github_label?: string | null;
  imageUrl?: string | null;
  technologies?: string[];
};

export default function ProjectDetailClient({
  project,
  locale,
}: {
  project: ProjectDetailData;
  locale: string;
}) {
  const tCommon = useTranslations("common");
  const tDetail = useTranslations("projects.detail");
  const router = useRouter();
  const [canGoBack, setCanGoBack] = useState(false);

  useEffect(() => {
    // Prüfen, ob wir eine History haben (von Home gekommen)
    if (typeof window !== 'undefined' && window.history.length > 1) {
      setCanGoBack(true);
    }
    
    try {
      navigator.sendBeacon?.(
        "/api/analytics/track",
        new Blob([JSON.stringify({ type: "pageview", projectId: project.id.toString(), page: `/${locale}/projects/${project.slug}` })], { type: "application/json" }),
      );
    } catch {}
  }, [project.id, project.slug, locale]);

  const handleBack = (e: React.MouseEvent) => {
    e.preventDefault();
    // Wenn wir direkt auf die Seite gekommen sind (Deep Link), gehen wir zur Projektliste
    // Ansonsten nutzen wir den Browser-Back, um an die exakte Stelle der Home oder Liste zurückzukehren
    if (canGoBack) {
      router.back();
    } else {
      router.push(`/${locale}/projects`);
    }
  };

  return (
    <div className="min-h-screen bg-[#fdfcf8] dark:bg-stone-950 pt-32 pb-20 px-6 transition-colors duration-500">
      <div className="max-w-7xl mx-auto">
        
        {/* Navigation - Intelligent Back */}
        <button
          onClick={handleBack}
          className="inline-flex items-center gap-2 text-stone-500 hover:text-stone-900 dark:hover:text-white transition-colors mb-12 group bg-transparent border-none cursor-pointer"
        >
          <ArrowLeft size={20} className="group-hover:-translate-x-1 transition-transform" />
          <span className="font-bold uppercase tracking-widest text-xs">
            {tCommon("back")}
          </span>
        </button>

        {/* Title Section */}
        <div className="mb-20">
          <h1 className="text-6xl md:text-[10rem] font-black tracking-tighter text-stone-900 dark:text-stone-50 leading-[0.85] uppercase mb-8">
            {project.title}<span className="text-liquid-mint">.</span>
          </h1>
          <p className="text-xl md:text-3xl font-light text-stone-500 dark:text-stone-400 max-w-4xl leading-snug tracking-tight">
            {project.description}
          </p>
        </div>

        {/* Feature Image Box */}
        <div className="bg-white dark:bg-stone-900 rounded-[3rem] p-4 md:p-8 border border-stone-200/60 dark:border-stone-800/60 shadow-sm mb-12 overflow-hidden">
          <div className="relative aspect-video rounded-[2rem] overflow-hidden border-4 border-stone-50 dark:border-stone-800 shadow-2xl">
            {project.imageUrl ? (
              <Image src={project.imageUrl} alt={project.title} fill className="object-cover" priority sizes="100vw" />
            ) : (
              <div className="absolute inset-0 bg-stone-100 dark:bg-stone-800 flex items-center justify-center">
                <span className="text-[15rem] font-black text-stone-200 dark:text-stone-700">{project.title.charAt(0)}</span>
              </div>
            )}
          </div>
        </div>

        <div className="grid grid-cols-1 lg:grid-cols-12 gap-8">
          <div className="lg:col-span-8 space-y-8">
            <div className="bg-white dark:bg-stone-900 rounded-[3rem] p-10 md:p-16 border border-stone-200/60 dark:border-stone-800/60 shadow-sm">
              <div className="prose prose-stone dark:prose-invert max-w-none text-lg md:text-xl font-light leading-relaxed">
                <ReactMarkdown>{project.content}</ReactMarkdown>
              </div>
            </div>
          </div>

          <div className="lg:col-span-4 space-y-8">
            <div className="bg-stone-900 dark:bg-stone-800 rounded-[3rem] p-10 border border-stone-800 dark:border-stone-700 shadow-2xl text-white">
              <h3 className="text-xl font-black mb-8 uppercase tracking-widest text-liquid-mint">Links</h3>
              <div className="space-y-4">
                {project.live && (
                  <a href={project.live} target="_blank" rel="noopener noreferrer" className="flex items-center justify-between w-full p-5 bg-white text-stone-900 rounded-2xl font-black hover:scale-105 transition-transform group">
                    <span>{project.button_live_label || tDetail("liveDemo")}</span>
                    <ExternalLink size={20} className="group-hover:translate-x-1 transition-transform" />
                  </a>
                )}
                {project.github && (
                  <a href={project.github} target="_blank" rel="noopener noreferrer" className="flex items-center justify-between w-full p-5 bg-stone-800 text-white border border-stone-700 rounded-2xl font-black hover:bg-stone-700 transition-colors group">
                    <span>{project.button_github_label || tDetail("viewSource")}</span>
                    <GithubIcon size={20} className="group-hover:rotate-12 transition-transform" />
                  </a>
                )}
              </div>
            </div>

            <div className="bg-white dark:bg-stone-900 rounded-[3rem] p-10 border border-stone-200/60 dark:border-stone-800/60 shadow-sm">
              <h3 className="text-xl font-black mb-8 uppercase tracking-widest text-stone-400">Stack</h3>
              <div className="flex flex-wrap gap-2">
                {project.tags.map((tag) => (
                  <span key={tag} className="px-4 py-2 bg-stone-50 dark:bg-stone-800 rounded-xl text-xs font-bold border border-stone-100 dark:border-stone-700">
                    {tag}
                  </span>
                ))}
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}