"use client";

import ReactMarkdown from "react-markdown";
import { useTranslations } from "next-intl";
import Image from "next/image";
import Link from "next/link";
import { useRouter } from "next/navigation";
import ProjectThumbnail from "@/app/components/ProjectThumbnail";
import { BackArrow, SubpageIntro, btn, card, frame, ghost, monoLabel } from "./subpage";

export type ProjectDetailData = {
  id: number;
  slug: string;
  title: string;
  description: string;
  content: string;
  tags: string[];
  featured: boolean;
  category: string;
  date?: string;
  created_at?: string;
  github?: string | null;
  github_url?: string | null;
  live?: string | null;
  button_live_label?: string | null;
  button_github_label?: string | null;
  imageUrl?: string | null;
  image_url?: 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 listHref = `/${locale}/projects`;
  const handleBack = (e: React.MouseEvent<HTMLAnchorElement>) => {
    // Kommt man von der eigenen Seite, geht es per Browser-Zurück an die exakte Stelle
    // (Startseite oder Liste). Bei Deep Links, ohne JS oder mit Modifier-Taste gilt der Link selbst.
    if (e.metaKey || e.ctrlKey || e.shiftKey || e.button !== 0) return;
    const fromHere = document.referrer && new URL(document.referrer).origin === window.location.origin;
    if (fromHere && window.history.length > 1) {
      e.preventDefault();
      router.back();
    }
  };

  const liveUrl = project.live && project.live !== "#" ? project.live : null;
  const githubUrl = project.github && project.github !== "#" ? project.github : null;
  const rawDate = project.date || project.created_at;
  const year = rawDate && !Number.isNaN(new Date(rawDate).getFullYear()) ? String(new Date(rawDate).getFullYear()) : null;
  const stack = project.technologies?.length ? project.technologies : project.tags;

  return (
    <article>
      <SubpageIntro
        back={
          <Link href={listHref} onClick={handleBack} className={ghost}>
            <BackArrow /> {tCommon("back")}
          </Link>
        }
        kicker={[project.category, year].filter(Boolean).join(" · ")}
        title={project.title}
      >
        <p>{project.description}</p>
      </SubpageIntro>

      <div className="relative mt-8 aspect-[4/3] overflow-hidden rounded-[18px] border-2 border-ink shadow-[8px_8px_0_rgb(var(--plakat-ink))] sm:aspect-video md:mt-12">
        {project.imageUrl ? (
          <Image src={project.imageUrl} alt={project.title} fill className="object-cover" priority sizes="(max-width: 1400px) 100vw, 1400px" />
        ) : (
          <div aria-hidden="true">
            <ProjectThumbnail title={project.title} category={project.category} tags={project.tags} slug={project.slug} size="hero" />
          </div>
        )}
      </div>

      <div className="mt-12 grid gap-10 lg:grid-cols-12 lg:gap-12">
        <div className="min-w-0 lg:col-span-8">
          {project.content ? (
            <div className="plakat-prose max-w-[68ch]">
              <ReactMarkdown>{project.content}</ReactMarkdown>
            </div>
          ) : (
            <p className="max-w-[68ch] text-lg leading-relaxed">{project.description}</p>
          )}
        </div>

        <aside className="grid content-start gap-6 lg:sticky lg:top-24 lg:col-span-4 lg:self-start">
          {(liveUrl || githubUrl) && (
            <section className={`${frame} bg-signal p-5 text-ink md:p-6`} aria-labelledby="project-links">
              <h2 id="project-links" className={monoLabel}>
                {tDetail("links")}
              </h2>
              <div className="mt-4 flex flex-wrap gap-2">
                {liveUrl && (
                  <a href={liveUrl} target="_blank" rel="noopener noreferrer" className={btn}>
                    {project.button_live_label || tDetail("liveDemo")} <span aria-hidden="true">↗</span>
                  </a>
                )}
                {githubUrl && (
                  <a href={githubUrl} target="_blank" rel="noopener noreferrer" className={`${ghost} px-5 py-3 text-[15px] font-semibold`}>
                    {project.button_github_label || tDetail("viewSource")} <span aria-hidden="true">↗</span>
                  </a>
                )}
              </div>
            </section>
          )}

          {stack.length > 0 && (
            <section className={`${card} p-5 md:p-6`} aria-labelledby="project-stack">
              <h2 id="project-stack" className={monoLabel}>
                {tDetail("techStack")}
              </h2>
              <ul className="mt-4 flex flex-wrap gap-2">
                {stack.map((tag) => (
                  <li key={tag} className="rounded-full px-3 py-1.5 text-sm font-medium shadow-[inset_0_0_0_1.5px_rgb(var(--plakat-ink))]">
                    {tag}
                  </li>
                ))}
              </ul>
            </section>
          )}

          <Link href={listHref} className={`${ghost} w-fit`}>
            <BackArrow /> {tCommon("backToProjects")}
          </Link>
        </aside>
      </div>
    </article>
  );
}