"use client";

import Image from "next/image";
import Link from "next/link";
import { Minus, Plus, ShoppingBag, Trash2 } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Progress } from "@/components/ui/progress";
import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from "@/components/ui/sheet";
import { formatMoney } from "@/lib/utils";
import { useCartStore } from "@/store/cart-store";

const FREE_SHIPPING_THRESHOLD = 250_000;

export function CartDrawer() {
  const { items, isOpen, closeCart, updateQuantity, removeItem, clearCart } = useCartStore();
  const subtotal = items.reduce((sum, item) => sum + (item.product.price ?? 0) * item.quantity, 0);
  const pricedItems = items.some((item) => item.product.price !== null);
  const progress = pricedItems ? Math.min(100, (subtotal / FREE_SHIPPING_THRESHOLD) * 100) : 0;
  const count = items.reduce((sum, item) => sum + item.quantity, 0);

  return (
    <Sheet open={isOpen} onOpenChange={(open) => { if (!open) closeCart(); }}>
      <SheetContent>
        <SheetHeader>
          <SheetTitle>Tu carrito</SheetTitle>
          <SheetDescription>{count} producto{count === 1 ? "" : "s"} seleccionado{count === 1 ? "" : "s"}.</SheetDescription>
        </SheetHeader>

        <div className="flex-1 space-y-5 overflow-y-auto p-6">
          {items.length === 0 ? (
            <div className="grid min-h-72 place-items-center rounded-3xl border border-dashed border-slate-300 bg-slate-50 text-center">
              <div><ShoppingBag className="mx-auto mb-3 size-10 text-cyan-500" /><p className="font-black">Tu carrito está vacío</p><p className="mt-1 text-sm text-slate-500">Agrega un tesoro para comenzar.</p></div>
            </div>
          ) : items.map((item) => (
            <article key={`${item.product.id}-${item.variantId ?? "default"}`} className="grid grid-cols-[82px_1fr_auto] gap-4 rounded-2xl border border-slate-100 p-3 shadow-sm">
              <div className="relative aspect-square overflow-hidden rounded-xl bg-slate-100"><Image src={item.product.thumbnail} alt={item.product.name} fill sizes="82px" className="object-cover" /></div>
              <div><h3 className="text-sm font-black leading-5">{item.product.name}</h3><p className="mt-1 text-xs text-slate-500">{formatMoney(item.product.price, item.product.currency)}</p><div className="mt-3 inline-flex items-center rounded-full border border-slate-200"><button aria-label="Restar" className="p-2" onClick={() => updateQuantity(item.product.id, item.quantity - 1)}><Minus className="size-3" /></button><span className="min-w-7 text-center text-xs font-black">{item.quantity}</span><button aria-label="Sumar" className="p-2" onClick={() => updateQuantity(item.product.id, item.quantity + 1)}><Plus className="size-3" /></button></div></div>
              <button className="self-start rounded-full p-2 text-slate-400 hover:bg-rose-50 hover:text-rose-600" onClick={() => removeItem(item.product.id)} aria-label="Eliminar"><Trash2 className="size-4" /></button>
            </article>
          ))}
        </div>

        <div className="space-y-4 border-t border-slate-100 p-6">
          <div><div className="mb-2 flex justify-between text-xs font-bold text-slate-600"><span>{pricedItems ? "Progreso para envío gratis" : "Cotización personalizada"}</span><span>{pricedItems ? `${Math.round(progress)}%` : "Por confirmar"}</span></div><Progress value={progress} /></div>
          <div className="flex items-center justify-between"><span className="font-bold text-slate-600">Subtotal</span><strong className="text-xl font-black">{pricedItems ? formatMoney(subtotal) : "Por confirmar"}</strong></div>
          {/* Button asChild + disabled no funciona sobre un <a> (:disabled
              es pseudo-clase de elementos de formulario, un Link nunca la
              cumple) -- se ramifica en vez de confiar en el prop disabled
              sobre un Link. */}
          {items.length > 0 ? (
            <Button asChild variant="primary" size="lg" className="w-full"><Link href="/checkout" onClick={closeCart}>Confirmar pedido</Link></Button>
          ) : (
            <Button variant="primary" size="lg" className="w-full" disabled>Confirmar pedido</Button>
          )}
          <Button variant="ghost" className="w-full" disabled={!items.length} onClick={clearCart}>Vaciar carrito</Button>
        </div>
      </SheetContent>
    </Sheet>
  );
}