"use client";

import Link from "next/link";
import { useState } from "react";
import { motion } from "motion/react";
import { ContentImage } from "@/components/content-image";
import { QuantityStepper } from "@/components/quantity-stepper";
import { StarRating } from "@/components/star-rating";
import { Button } from "@/components/ui";
import { formatPrice, formatPricePerKg } from "@/lib/format";
import { useCartStore } from "@/store/cart-store";
import { useI18n } from "@/i18n/i18n-provider";
import type { ProductWithRelations } from "@/lib/data";
import type { ProductCategory } from "@/generated/prisma/client";

// Unterscheidet die Platzhalterfarbe im Shop-Grid nach Kategorie, statt
// jedes Produkt im selben Honigton zu zeigen — verbessert die Scanbarkeit
// des Rasters, bis echte Produktfotografie vorliegt.
const categoryTone: Record<ProductCategory, "forest" | "cream" | "honey"> = {
  HONIG: "honey",
  KERZEN: "forest",
  PROPOLIS: "cream",
};

/**
 * Leichtgewichtiger Produkt-Verweis fuer Herkunfts-/Chargenseiten (Charge,
 * Ernte) — nur Bild, Name und Link, ohne Preis/Bestand/Warenkorb-Funktion.
 * Diese Seiten geht es um Nachweis/Herkunft, nicht ums Verkaufen.
 */
export function ProductTeaserLink({
  slug,
  name,
  image,
}: {
  slug: string;
  name: string;
  image?: string | null;
}) {
  const { t } = useI18n();
  return (
    <Link
      href={`/honig/${slug}`}
      className="group flex items-center gap-4 border border-ink/10 p-4 transition-colors hover:border-forest"
    >
      <ContentImage src={image ?? null} alt={name} tone="honey" className="w-16 h-16 flex-shrink-0" sizes="64px" />
      <span>
        <span className="block text-forest">{name}</span>
        <span className="block mt-1 text-sm text-ink/70 group-hover:text-forest transition-colors">
          {t.product.viewProduct}
        </span>
      </span>
    </Link>
  );
}

export function TasteScale({
  label,
  value,
  tone = "default",
}: {
  label: string;
  value: number;
  /** "inverted" fuer Abschnitte auf dunklem Grund (z.B. bg-forest) — sonst waeren Label und leere Skalenpunkte auf dunklem Hintergrund kaum lesbar. */
  tone?: "default" | "inverted";
}) {
  return (
    <div className="flex items-center gap-3 text-sm">
      <span className={`w-16 ${tone === "inverted" ? "text-cream/70" : "text-ink/70"}`}>
        {label}
      </span>
      <div className="flex gap-1">
        {Array.from({ length: 5 }, (_, i) => (
          <span
            key={i}
            className={`h-1.5 w-5 rounded-full ${
              i < value ? "bg-honey" : tone === "inverted" ? "bg-cream/15" : "bg-ink/10"
            }`}
          />
        ))}
      </div>
    </div>
  );
}

function toCartItem(product: ProductWithRelations) {
  return {
    productId: product.id,
    slug: product.slug,
    name: product.name,
    weightGrams: product.weightGrams,
    priceCents: product.priceCents,
    image: product.images[0] ?? null,
  };
}

export function AddToCartButton({
  product,
  quantity = 1,
  variant,
  className = "",
}: {
  product: ProductWithRelations;
  quantity?: number;
  variant?: "primary" | "secondary" | "ghost";
  className?: string;
}) {
  const { t } = useI18n();
  const addItem = useCartStore((s) => s.addItem);
  const [justAdded, setJustAdded] = useState(false);

  return (
    <motion.div whileTap={{ scale: 0.97 }} className={className}>
      <Button
        variant={variant}
        className="w-full"
        onClick={() => {
          addItem(toCartItem(product), quantity);
          setJustAdded(true);
          window.setTimeout(() => setJustAdded(false), 1500);
        }}
      >
        {justAdded ? t.product.added : t.product.addToCart}
      </Button>
    </motion.div>
  );
}

/**
 * Wie AddToCartButton, aber mit einem Mengen-Steller davor — fuer die
 * Produktdetailseite, wo Kund:innen die Menge vor dem Hinzufuegen waehlen
 * koennen sollen, statt sie erst im Warenkorb nachtraeglich anzupassen.
 */
export function AddToCartWithQuantity({
  product,
  maxQuantity,
  className = "",
}: {
  product: ProductWithRelations;
  maxQuantity: number;
  className?: string;
}) {
  const { t } = useI18n();
  const addItem = useCartStore((s) => s.addItem);
  const [quantity, setQuantity] = useState(1);
  const [justAdded, setJustAdded] = useState(false);

  return (
    <div className={className}>
      <div className="flex items-stretch gap-3">
        <QuantityStepper quantity={quantity} onChange={setQuantity} max={maxQuantity} />
        <motion.div whileTap={{ scale: 0.97 }} className="flex-1">
          <Button
            className="w-full h-full"
            onClick={() => {
              addItem(toCartItem(product), quantity);
              setJustAdded(true);
              window.setTimeout(() => setJustAdded(false), 1500);
            }}
          >
            {justAdded ? t.product.added : t.product.addToCart}
          </Button>
        </motion.div>
      </div>
    </div>
  );
}

export function ProductCard({
  product,
  reviewSummary,
}: {
  product: ProductWithRelations;
  /** Optional — nur die Shop-Uebersicht laedt Bewertungen gebuendelt fuer das ganze Raster. */
  reviewSummary?: { average: number | null; count: number };
}) {
  const { t, locale } = useI18n();
  const stock = product.inventory?.quantity ?? 0;

  return (
    <motion.article
      initial={{ opacity: 0, y: 16 }}
      whileInView={{ opacity: 1, y: 0 }}
      viewport={{ once: true, margin: "-60px" }}
      transition={{ duration: 0.5 }}
      className="group"
    >
      <Link
        href={`/honig/${product.slug}`}
        className="relative block overflow-hidden transition-shadow duration-500 group-hover:shadow-[0_24px_48px_-20px_rgba(36,53,43,0.4)]"
      >
        <ContentImage
          src={product.images[0] ?? null}
          alt={product.name}
          tone={categoryTone[product.category]}
          className="aspect-[4/5] w-full transition-transform duration-500 group-hover:scale-[1.03]"
          label={
            product.harvest
              ? `${product.harvest.year} · ${product.harvest.type}`
              : t.common.categories[product.category]
          }
          sizes="(min-width: 1024px) 33vw, (min-width: 640px) 50vw, 100vw"
        />
        {stock === 0 ? (
          <span className="absolute top-3 left-3 bg-ink/80 text-cream text-[10px] tracking-wide-caps px-2.5 py-1">
            {t.product.outOfStock}
          </span>
        ) : stock <= 5 ? (
          <span className="absolute top-3 left-3 bg-honey text-cream text-[10px] tracking-wide-caps px-2.5 py-1">
            {t.product.onlyLeft(stock)}
          </span>
        ) : null}
      </Link>
      <div className="mt-4">
        <Link href={`/honig/${product.slug}`}>
          <h3 className="text-xl text-forest">{product.name}</h3>
        </Link>
        <p className="text-sm text-ink/70 mt-1">
          {product.tasteTags.join(" · ")}
        </p>
        <p
          className={`mt-1.5 flex items-center gap-1.5 ${
            reviewSummary && reviewSummary.count > 0 ? "" : "invisible"
          }`}
        >
          <StarRating value={reviewSummary?.average ?? 0} size={12} />
          <span className="text-xs text-ink/65">
            {(reviewSummary?.average ?? 0).toFixed(1)} ({reviewSummary?.count ?? 0})
          </span>
        </p>
        <div className="mt-2 flex items-center justify-between">
          <span className="text-sm text-ink/65">{product.weightGrams} g</span>
          <span className="text-base text-forest">
            {formatPrice(product.priceCents, product.currency, locale)}
          </span>
        </div>
        <p className="text-xs text-ink/65">
          {formatPricePerKg(product.pricePerKgCents, product.currency, locale)}
        </p>
        {stock > 0 ? (
          <AddToCartButton product={product} variant="secondary" className="mt-4" />
        ) : null}
        <Link
          href={`/honig/${product.slug}`}
          className="mt-4 inline-block text-sm tracking-wide-caps text-forest border-b border-forest/40 pb-0.5 hover:border-forest"
        >
          {product.category === "HONIG" ? t.product.toHoney : t.product.toProduct}
        </Link>
      </div>
    </motion.article>
  );
}