import Image from "next/image";
import Link from "next/link";
import { Check } from "lucide-react";
import type { CmsProductContent } from "@/types/cms-landing";

const DEFAULT_TITLE =
  "The product we offer is designed to meet your business needs.";
const DEFAULT_BODY =
  "Social media marketing services are provided by companies or individuals who specialize in marketing strategies through social media platforms.";

function cardImageUrl(p: CmsProductContent) {
  return p.images?.[0]?.image_url?.trim() || "/image/p1.png";
}

/** Normalize CMS link: relative paths and full URLs; bare domains get https:// */
function resolveProductLink(raw: string | undefined | null): string | null {
  const t = raw?.trim();
  if (!t) return null;
  if (/^(https?:|\/|#|mailto:)/i.test(t)) return t;
  return `https://${t}`;
}

function LearnMoreCta({ href }: { href?: string | null }) {
  const resolved = resolveProductLink(href);
  const className =
    "inline-flex text-sm font-semibold text-[#966314] hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[#966314]";
  if (!resolved) return null;
  if (resolved.startsWith("/")) {
    return (
      <Link href={resolved} className={className}>
        Learn More →
      </Link>
    );
  }
  return (
    <a href={resolved} target="_blank" rel="noopener noreferrer" className={className}>
      Learn More →
    </a>
  );
}

/** Renders "Label: rest" with a bold label when a colon is present (one colon split). */
function BulletLine({ text }: { text: string }) {
  const idx = text.indexOf(":");
  if (idx > 0 && idx < text.length - 1) {
    const label = text.slice(0, idx).trim();
    const rest = text.slice(idx + 1).trim();
    return (
      <>
        <span className="font-semibold text-gray-900">{label}:</span> {rest}
      </>
    );
  }
  return <>{text}</>;
}

function ProductImageBlock({
  imgSrc,
  alt,
}: {
  imgSrc: string;
  alt: string;
}) {
  const external = /^https?:\/\//i.test(imgSrc);
  return (
    <div className="relative flex w-full max-w-xl justify-center md:max-w-none md:flex-1">
      <div className="relative flex aspect-[4/3] w-full max-w-[520px] items-center justify-center rounded-2xl bg-gray-50 md:aspect-[5/4]">
        {external ? (
          // eslint-disable-next-line @next/next/no-img-element
          <img src={imgSrc} alt={alt} className="h-full w-full rounded-2xl object-contain" />
        ) : (
          <Image
            src={imgSrc}
            alt={alt}
            width={520}
            height={420}
            className="object-contain"
          />
        )}
      </div>
    </div>
  );
}

function ProductOrderBadge({ order }: { order: number }) {
  return (
    <div
      className="mb-6 flex h-12 w-12 items-center justify-center rounded-xl bg-[#fdecc8]"
      aria-hidden
    >
      <span className="text-lg font-bold tabular-nums text-[#966314]">{order}</span>
    </div>
  );
}

function ProductTextBlock({ p, order }: { p: CmsProductContent; order: number }) {
  const rawDesc = p.description?.trim();
  const lines = rawDesc
    ? rawDesc.split(/\r?\n/).map((l) => l.trim()).filter(Boolean)
    : [];
  const useBullets = lines.length > 1;
  const bodyText = lines.length === 0 ? DEFAULT_BODY : rawDesc ?? "";

  return (
    <div className="w-full max-w-xl md:flex-1">
      <ProductOrderBadge order={order} />
      <h3 className="mb-4 text-2xl font-bold text-gray-900 md:text-3xl whitespace-pre-line">
        {p.primary_title?.trim() || "Product"}
      </h3>
      {p.secondary_title?.trim() ? (
        <p className="mb-6 text-base leading-relaxed text-gray-600">
          {p.secondary_title.trim()}
        </p>
      ) : null}
      {useBullets ? (
        <ul className="mb-8 space-y-4">
          {lines.map((item, i) => (
            <li key={`${i}-${item.slice(0, 48)}`} className="flex gap-4 text-sm leading-relaxed text-gray-600">
              <span className="mt-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-[#fdecc8]">
                <Check size={14} className="text-[#966314]" aria-hidden />
              </span>
              <span>
                <BulletLine text={item} />
              </span>
            </li>
          ))}
        </ul>
      ) : (
        <p className="mb-8 text-sm leading-relaxed text-gray-600 whitespace-pre-line md:text-base">
          {bodyText}
        </p>
      )}
      <LearnMoreCta href={p.link_url} />
    </div>
  );
}

export default function ProductSection({
  products,
}: {
  products?: CmsProductContent[] | null;
}) {
  const list = products?.filter((p) => p.id) ?? [];

  if (list.length === 0) {
    return (
      <section
        id="products"
        className="scroll-mt-24 bg-white py-24 md:scroll-mt-[5.5rem] md:py-32"
      >
        <div className="container mx-auto px-6">
          <div className="mb-16 text-center md:mb-20">
            <p className="mb-4 text-sm font-semibold uppercase tracking-widest text-gray-400">
              Our Product
            </p>
            <h2 className="mx-auto max-w-3xl text-4xl font-extrabold leading-tight md:text-5xl whitespace-pre-line">
              {DEFAULT_TITLE}
            </h2>
          </div>
          <div className="flex flex-col items-center gap-12 md:flex-row md:items-center">
            <ProductImageBlock imgSrc="/image/p1.png" alt="Product illustration" />
            <div className="w-full max-w-xl md:flex-1">
              <div className="mb-6 flex h-12 w-12 items-center justify-center rounded-xl bg-[#fdecc8]">
                <Image src="/image/product-icon.png" alt="" width={22} height={22} />
              </div>
              <h3 className="mb-4 text-2xl font-bold text-gray-900 md:text-3xl">
                MediaHUB Content Aggregator
              </h3>
              <p className="mb-8 text-sm leading-relaxed text-gray-600 md:text-base whitespace-pre-line">
                {DEFAULT_BODY}
              </p>
              <LearnMoreCta href={null} />
            </div>
          </div>
        </div>
      </section>
    );
  }

  return (
    <section
      id="products"
      className="scroll-mt-24 bg-white py-24 md:scroll-mt-[5.5rem] md:py-32"
    >
      <div className="container mx-auto px-6">
        <div className="mb-16 text-center md:mb-20">
          <p className="mb-4 text-sm font-semibold uppercase tracking-widest text-gray-400">
            Our Product
          </p>
          <h2 className="mx-auto max-w-3xl text-4xl font-extrabold leading-tight md:text-5xl">
            The product we offer is
            <span className="relative inline-block">
            <span className="absolute bottom-2 left-0 h-3 w-full bg-[#f5d28a]"></span>
            <span className="relative italic text-[#966314]">designed</span></span> to meet your business needs.
          </h2>
        </div>

        <div className="flex flex-col gap-20 md:gap-28">
          {list.map((p, index) => {
            const imgSrc = cardImageUrl(p);
            const alt = p.primary_title?.trim() || "Product";
            const reverse = index % 2 === 1;
            return (
              <div
                key={p.id}
                className={`flex flex-col items-stretch gap-12 md:flex-row md:items-center md:gap-16 lg:gap-24 ${
                  reverse ? "md:flex-row-reverse" : ""
                }`}
              >
                <ProductImageBlock imgSrc={imgSrc} alt={alt} />
                <ProductTextBlock p={p} order={index + 1} />
              </div>
            );
          })}
        </div>
      </div>
    </section>
  );
}