"use client";

import Image from "next/image";
import { useMemo, useState } from "react";
import type { ProductDetail, ProductVariantOption } from "@/data/product-detail";
import BilingualTitle from "@/components/ui/BilingualTitle";

type ProductBuyBoxProps = {
  product: ProductDetail;
};

function OptionRow({
  labelFa,
  labelEn,
  options,
  value,
  onChange,
  kind,
}: {
  labelFa: string;
  labelEn: string;
  options: ProductVariantOption[];
  value: string;
  onChange: (id: string) => void;
  kind: "color" | "size" | "package";
}) {
  if (!options.length) return null;

  return (
    <div className="space-y-2.5">
      <div className="flex items-baseline justify-between gap-3">
        <p className="text-sm text-ink">{labelFa}</p>
        <p dir="ltr" className="font-montserrat text-[10px] tracking-[0.14em] text-muted uppercase">
          {labelEn}
        </p>
      </div>
      <div className="flex flex-wrap gap-2">
        {options.map((opt) => {
          const selected = value === opt.id;
          const disabled = opt.available === false;
          const tip = opt.labelEn || opt.labelFa;
          if (kind === "color") {
            return (
              <button
                key={opt.id}
                type="button"
                disabled={disabled}
                title={tip}
                aria-label={tip}
                onClick={() => onChange(opt.id)}
                className={`group/swatch relative h-9 w-9 rounded-full border transition-transform ${
                  selected ? "border-ink scale-105" : "border-line"
                } ${disabled ? "opacity-35 cursor-not-allowed" : "hover:border-ink"}`}
                aria-pressed={selected}
              >
                <span
                  className="absolute inset-1 rounded-full border border-black/5"
                  style={{ background: opt.swatch || "#ccc" }}
                />
                <span
                  role="tooltip"
                  className="pointer-events-none absolute bottom-[calc(100%+6px)] left-1/2 z-20 -translate-x-1/2 whitespace-nowrap rounded-[3px] bg-ink px-2 py-1 font-montserrat text-[10px] uppercase tracking-[0.08em] text-white opacity-0 transition-opacity group-hover/swatch:opacity-100"
                >
                  {tip}
                </span>
              </button>
            );
          }
          return (
            <button
              key={opt.id}
              type="button"
              disabled={disabled}
              title={tip}
              aria-label={tip}
              onClick={() => onChange(opt.id)}
              className={`min-w-[2.75rem] border px-3 py-2 text-sm uppercase tracking-[0.04em] transition-colors ${
                selected
                  ? "border-ink bg-ink text-white"
                  : "border-line bg-white text-ink hover:border-ink"
              } ${disabled ? "opacity-35 cursor-not-allowed line-through" : ""}`}
              aria-pressed={selected}
            >
              {kind === "size" ? opt.labelEn.toUpperCase() : opt.labelFa}
            </button>
          );
        })}
      </div>
    </div>
  );
}

export default function ProductBuyBox({ product }: ProductBuyBoxProps) {
  const firstColor =
    product.colors.find((c) => c.available !== false)?.id ??
    product.colors[0]?.id ??
    "";
  const firstSize =
    product.sizes.find((s) => s.available !== false)?.id ??
    product.sizes[0]?.id ??
    "";
  const firstPackage =
    product.packages.find((p) => p.available !== false)?.id ??
    product.packages[0]?.id ??
    "";

  const [color, setColor] = useState(firstColor);
  const [size, setSize] = useState(firstSize);
  const [pkg, setPkg] = useState(firstPackage);

  const selectedColor = useMemo(
    () => product.colors.find((c) => c.id === color),
    [color, product.colors],
  );

  return (
    <div className="flex flex-col gap-6 lg:gap-8">
      <div className="text-right">
        <BilingualTitle
          titleFa={product.nameFa}
          titleEn={product.nameEn}
          size="lg"
          align="end"
        />
        <p className="mt-4 text-sm leading-7 text-ink/75">{product.summary}</p>
      </div>

      <div className="space-y-5">
        <OptionRow
          labelFa={`رنگ${selectedColor ? ` · ${selectedColor.labelFa}` : ""}`}
          labelEn="Color"
          options={product.colors}
          value={color}
          onChange={setColor}
          kind="color"
        />
        <OptionRow
          labelFa="سایز"
          labelEn="Size"
          options={product.sizes}
          value={size}
          onChange={setSize}
          kind="size"
        />
        <OptionRow
          labelFa="بسته‌بندی"
          labelEn="Package"
          options={product.packages}
          value={pkg}
          onChange={setPkg}
          kind="package"
        />
      </div>

      <div dir="ltr" className="flex items-baseline gap-2 border-y border-line py-4">
        <p className="font-montserrat text-2xl text-ink sm:text-3xl">
          {product.price}
        </p>
        <p className="text-xs text-muted">IRT</p>
      </div>

      {/* Sizing guide frame */}
      <div className="relative overflow-hidden rounded-[5px] border border-dashed border-ink/25 bg-[#f7f7f5]">
        <div
          aria-hidden
          className="pointer-events-none absolute inset-0 opacity-60"
          style={{
            backgroundImage:
              "radial-gradient(circle, rgba(10,10,10,0.12) 0.7px, transparent 1px)",
            backgroundSize: "12px 12px",
          }}
        />
        <div className="relative grid gap-4 p-4 sm:grid-cols-[minmax(0,1fr)_140px] sm:items-center">
          <div>
            <p className="font-doran text-lg text-ink">راهنمای سایز</p>
            <p
              dir="ltr"
              className="mt-1 font-montserrat text-[10px] uppercase tracking-[0.16em] text-muted"
            >
              Sizing guide
            </p>
            <p className="mt-2 text-xs leading-6 text-ink/70">
              {product.sizeGuideNote}
            </p>
            <a
              href="#product-tabs"
              className="mt-3 inline-flex text-sm text-ink underline underline-offset-4 hover:opacity-70"
            >
              مشاهده جدول اندازه‌ها
            </a>
          </div>
          <div className="relative mx-auto aspect-[3/4] w-full max-w-[140px] overflow-hidden rounded-[5px] border border-line bg-white">
            {product.sizeGuideImage ? (
              <Image
                src={product.sizeGuideImage}
                alt=""
                fill
                sizes="140px"
                className="object-cover object-top opacity-90"
              />
            ) : (
              <span className="absolute inset-0 flex items-center justify-center text-[11px] text-muted">
                Size chart
              </span>
            )}
          </div>
        </div>
      </div>

      <div className="flex flex-col gap-2 sm:flex-row">
        <button
          type="button"
          className="group relative inline-flex h-12 flex-1 items-center justify-center overflow-hidden rounded-[5px] border border-ink bg-ink px-4 text-white"
        >
          <span
            aria-hidden
            className="pointer-events-none absolute inset-0 origin-bottom scale-y-0 bg-white transition-transform duration-[400ms] ease-out group-hover:scale-y-100"
          />
          <span className="relative z-10 text-sm transition-colors duration-[400ms] group-hover:text-ink sm:text-base">
            افزودن به سبد
          </span>
        </button>
        <button
          type="button"
          className="inline-flex h-12 items-center justify-center gap-2 rounded-[5px] border border-line px-4 text-sm text-ink transition-colors hover:border-ink"
          aria-label="افزودن به علاقه‌مندی"
        >
          <Image
            src="/images/home/icons/bookmark.svg"
            alt=""
            width={20}
            height={20}
            unoptimized
          />
          علاقه‌مندی
        </button>
      </div>
    </div>
  );
}