"use client";

import Link from "next/link";
import Image from "next/image";
import { ChevronLeft, ImageIcon } from "lucide-react";
import { Button } from "@/components/ui/button";
import { getFeaturedImageUrl, type WpPost } from "@/lib/wp-api";
import { formatDateShamsi } from "@/lib/format-date";
import { cn } from "@/lib/utils";
import { type } from "@/lib/typography";

function stripHtml(html: string): string {
  return html.replace(/<[^>]*>/g, "").trim();
}

/** کارت با تصویر به‌صورت پس‌زمینه و عنوان + توضیح در پایین با overlay */
function PostCard({
  post,
  size = "default",
}: {
  post: WpPost;
  size?: "large" | "default";
}) {
  const excerpt =
    stripHtml(post.excerpt.rendered) ||
    stripHtml(post.content.rendered).slice(0, size === "large" ? 280 : 120);
  const date = post.date ? formatDateShamsi(post.date) : null;
  const authorName = post._embedded?.author?.[0]?.name ?? null;
  const thumbnailUrl = getFeaturedImageUrl(post, size === "large" ? "medium_large" : "medium");
  const href = `/blog/${post.slug}`;

  return (
    <Link
      href={href}
      className={cn(
        "group relative flex overflow-hidden rounded-xl border border-border shadow-sm transition-all duration-300 hover:shadow-lg hover:border-border/80",
        size === "large" ? "min-h-[420px]" : "min-h-[200px]"
      )}
    >
      {/* پس‌زمینه: تصویر تمام کارت */}
      {thumbnailUrl ? (
        <Image
          src={thumbnailUrl}
          alt=""
          fill
          className="object-cover transition-transform duration-500 ease-out group-hover:scale-105"
          sizes={size === "large" ? "50vw, 600px" : "25vw, 300px"}
        />
      ) : (
        <div className="absolute inset-0 flex items-center justify-center bg-muted" aria-hidden>
          <ImageIcon className="size-12 text-muted-foreground/40" />
        </div>
      )}
      {/* گرادیان شفاف و متن در پایین */}
      <div className="absolute inset-0 bg-gradient-to-t from-black/85 via-black/30 to-transparent" />
      <div
        className="absolute bottom-0 left-0 right-0 p-4 text-white transition-all duration-300 md:-bottom-16 md:p-5 md:[mask-image:linear-gradient(to_bottom,black_0%,transparent)] md:[mask-size:100%_100%] group-hover:bottom-0 group-hover:[mask-image:none]"
      >
        <h3
          className={cn(
            "font-bold leading-tight line-clamp-2 drop-shadow-sm",
            size === "large" ? cn(type.h3, "text-white") : cn(type["card-title"], "text-white")
          )}
          dangerouslySetInnerHTML={{ __html: post.title.rendered }}
        />
        <p
          className={cn(
            "mt-2 text-white/90 leading-relaxed line-clamp-2",
            size === "large" ? cn(type.body, "line-clamp-3 text-white/90") : cn(type["body-sm"], "text-white/90")
          )}
        >
          {excerpt}
        </p>
      </div>
    </Link>
  );
}

/** کارت ردیفی: تصویر کنار عنوان، بدون توضیح */
function PostCardRow({ post }: { post: WpPost }) {
  const date = post.date ? formatDateShamsi(post.date) : null;
  const authorName = post._embedded?.author?.[0]?.name ?? null;
  const thumbnailUrl = getFeaturedImageUrl(post, "medium");
  const href = `/blog/${post.slug}`;

  return (
    <Link
      href={href}
      className="group flex min-h-[70px] overflow-hidden rounded-xl transition-all duration-300"
    >
      {/* نیمه عنوان + نویسنده */}
      <div className="flex flex-1 flex-col justify-center p-4">
        <h3
          className={cn(type["card-title"], "line-clamp-2 text-foreground")}
          dangerouslySetInnerHTML={{ __html: post.title.rendered }}
        />
      </div>
    </Link>
  );
}

const DEFAULT_TITLE = "از دانشنامه";
const DEFAULT_CAPTION =
  "از داده تا بینش؛ یادداشت‌ها و تجربه‌هایی که مسیر شما را روشن‌تر می‌کنند.";
const DEFAULT_CTA_LABEL = "مشاهده همه مقالات";
const DEFAULT_CTA_HREF = "/blog";

interface FeaturedPostsGridProps {
  posts: WpPost[];
  /** عنوان بخش */
  title?: string;
  /** کپشن زیر عنوان */
  caption?: string;
  /** متن دکمه CTA */
  ctaLabel?: string;
  /** لینک CTA (پیش‌فرض: /blog) */
  ctaHref?: string;
}

export function FeaturedPostsGrid({
  posts,
  title = DEFAULT_TITLE,
  caption = DEFAULT_CAPTION,
  ctaLabel = DEFAULT_CTA_LABEL,
  ctaHref = DEFAULT_CTA_HREF,
}: FeaturedPostsGridProps) {
  if (!posts.length) return null;

  const [first, second, third, fourth] = posts;

  return (
    <section className="bg-background py-16 md:py-24" aria-label={title}>
      <div className="mx-auto max-w-6xl px-4 sm:px-6">
        <header className="mb-10 text-center md:mb-12">
          <h2 className={type.h2}>
            {title}
          </h2>
          <p className={cn(type["body-sm"], "mx-auto mt-3 max-w-2xl text-muted-foreground md:text-base")}>
            {caption}
          </p>
        </header>
        <div className="grid grid-cols-1 gap-4 lg:grid-cols-3 lg:gap-5">
          {/* کارت بزرگ: در RTL سمت چپ، در LTR سمت راست */}
          {first && (
            <div className="lg:col-span-2 lg:min-h-0">
              <PostCard post={first} size="large" />
            </div>
          )}
          {/* سه کارت کوچک: یک بالا، دو پایین */}
          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:order-1 lg:grid-cols-1 lg:gap-5">
            {second && (
              <div className="min-h-[200px]">
                <PostCard post={second} size="default" />
              </div>
            )}
            {third && (
              <div className="min-h-[120px]">
                <PostCard post={third} size="default" />
              </div>
            )}
          </div>
        </div>
        <div className="mt-12 flex flex-col items-center justify-center gap-3 text-center md:mt-16">
          <p className={type.caption}>
            مطالب بیشتر در دانشنامه
          </p>
          <Button asChild size="lg" variant="outline" className="rounded-full px-6 font-medium shadow-sm transition-all hover:shadow-md">
            <Link href={ctaHref} className="inline-flex items-center gap-2">
              {ctaLabel}
              <ChevronLeft className="size-4" aria-hidden />
            </Link>
          </Button>
        </div>
      </div>
    </section>
  );
}