'use client';

import { useState } from 'react';
import { v4 as uuid } from 'uuid';
import ProductMockup from './ProductMockup';
import Price from './Price';
import LoginPromptModal from './LoginPromptModal';
import AddToCartModal from './AddToCartModal';
import { useCart } from '@/lib/cartStore';
import { getColorName } from '@/lib/colorNames';
import { checkCustomerAuth } from '@/app/actions';
import type { ProductDTO } from '@/lib/types';

export default function StandardProductView({ product }: { product: ProductDTO }) {
  const [color, setColor] = useState(product.colors[0]);
  const [size, setSize] = useState<string | null>(product.sizes[0] ?? null);
  const [view, setView] = useState<'front' | 'back'>('front');
  const [quantity, setQuantity] = useState(1);
  const [justAdded, setJustAdded] = useState(false);
  const [showLoginPrompt, setShowLoginPrompt] = useState(false);
  const [showAddToCartModal, setShowAddToCartModal] = useState(false);
  const addItem = useCart((s) => s.addItem);

  const hasBack = Boolean(product.imageUrlBack);

  function renderPhoto(v: 'front' | 'back') {
    const colorPhoto = v === 'front' ? product.colorPhotos[color] : product.colorPhotosBack[color];
    if (colorPhoto) {
      return <img src={colorPhoto} alt={`${product.name} in ${color}`} className="h-full w-full object-cover" />;
    }

    const activePhoto = v === 'front' ? product.imageUrl : product.imageUrlBack;
    if (!activePhoto) {
      return <ProductMockup mockup={product.mockup} color={color} />;
    }
    if (product.photoRecolorable) {
      return (
        <div className="relative h-full w-full">
          <img
            src={activePhoto}
            alt={product.name}
            className="h-full w-full object-cover"
            style={{ filter: 'grayscale(1) brightness(2.1) contrast(1.15)' }}
          />
          <div className="absolute inset-0" style={{ backgroundColor: color, mixBlendMode: 'multiply' }} />
        </div>
      );
    }
    return <img src={activePhoto} alt={product.name} className="h-full w-full object-cover" />;
  }

  const handleAddToBag = async () => {
    addItem({
      cartItemId: uuid(),
      productId: product.id,
      slug: product.slug,
      name: product.name,
      mockup: product.mockup,
      color,
      size,
      quantity,
      unitPrice: product.effectivePrice,
      designJson: { front: [], back: [] },
      designPreviewUrl: product.colorPhotos[color] ?? product.imageUrl ?? '',
      designPreviewUrlBack: product.colorPhotosBack[color] ?? product.imageUrlBack ?? null,
      placementPreviewUrl: product.colorPhotos[color] ?? product.imageUrl ?? null,
      placementPreviewUrlBack: product.colorPhotosBack[color] ?? product.imageUrlBack ?? null,
    });
    setShowAddToCartModal(true);
  };

  return (
    <div className="grid grid-cols-1 gap-10 lg:grid-cols-[560px_1fr]">
      {/* Photo */}
      <div className="w-full min-w-0 max-w-[560px]">
        {hasBack && (
          <div className="mb-3 inline-flex border border-line">
            <button
              onClick={() => setView('front')}
              className={`px-4 py-1.5 text-sm ${view === 'front' ? 'bg-ink text-paper' : 'hover:text-clay'}`}
            >
              Front
            </button>
            <button
              onClick={() => setView('back')}
              className={`px-4 py-1.5 text-sm ${view === 'back' ? 'bg-ink text-paper' : 'hover:text-clay'}`}
            >
              Back
            </button>
          </div>
        )}
        <div className="relative aspect-square w-full border border-line bg-surface">
          {renderPhoto(view)}
        </div>
      </div>

      {/* Controls */}
      <div className="flex flex-col gap-8">
        <div>
          <h1 className="font-display text-4xl">{product.name}</h1>
          <p className="mt-2 text-muted">{product.description}</p>
          <p className="mt-4 flex items-baseline gap-2 font-mono text-lg">
            {product.onSale && product.originalPrice != null && (
              <Price cents={product.originalPrice} className="text-base text-muted line-through" />
            )}
            <Price cents={product.effectivePrice} className={product.onSale ? 'text-splash-pink' : undefined} />
          </p>
        </div>

        <div>
          <p className="tag-label mb-3">Color</p>
          <div className="space-y-2">
            <div className="flex flex-wrap gap-3">
              {product.colors.map((c) => (
                <button
                  key={c}
                  onClick={() => setColor(c)}
                  aria-label={`Choose ${getColorName(c)} color`}
                  className={`h-9 w-9 rounded-full border transition-transform ${
                    color === c ? 'scale-110 border-ink ring-2 ring-ink ring-offset-2 ring-offset-paper' : 'border-line'
                  }`}
                  style={{ backgroundColor: c }}
                  title={getColorName(c)}
                />
              ))}
            </div>
            {color && (
              <p className="text-sm text-muted font-medium">
                Selected: <span className="text-ink">{getColorName(color)}</span>
              </p>
            )}
          </div>
          {product.imageUrl && !product.photoRecolorable && Object.keys(product.colorPhotos).length === 0 && (
            <p className="mt-2 text-xs text-muted">
              This product uses a real photo, so the picture won&apos;t change color — your pick is
              still saved with the order.
            </p>
          )}
        </div>

        {product.sizes.length > 0 && (
          <div>
            <p className="tag-label mb-3">Size</p>
            <div className="flex flex-wrap gap-2">
              {product.sizes.map((s) => (
                <button
                  key={s}
                  onClick={() => setSize(s)}
                  className={`min-w-[44px] border px-3 py-2 text-sm transition-colors ${
                    size === s
                      ? 'border-clay bg-clay text-paper'
                      : 'border-line text-ink hover:border-clay hover:text-clay'
                  }`}
                >
                  {s}
                </button>
              ))}
            </div>
          </div>
        )}

        <div className="flex items-center gap-4">
          <div className="flex items-center border border-ink">
            <button
              onClick={() => setQuantity((q) => Math.max(1, q - 1))}
              className="px-3 py-2 text-sm"
              aria-label="Decrease quantity"
            >
              −
            </button>
            <span className="w-10 text-center font-mono text-sm">{quantity}</span>
            <button
              onClick={() => setQuantity((q) => q + 1)}
              className="px-3 py-2 text-sm"
              aria-label="Increase quantity"
            >
              +
            </button>
          </div>
          <button
            onClick={handleAddToBag}
            className="flex-1 bg-clay px-6 py-3 text-sm font-medium text-paper transition-colors hover:bg-clay-dark"
          >
            Add to bag — <Price cents={product.effectivePrice * quantity} />
          </button>
        </div>

        <p className="text-xs text-muted border-t border-line pt-4">
          💡 <strong>Color note:</strong> There may be slight color differences based on lighting and screen settings for personalized, plain, and ready-made items. Your actual item may vary slightly from the preview shown.
        </p>
      </div>

      <LoginPromptModal isOpen={showLoginPrompt} onClose={() => setShowLoginPrompt(false)} />
      <AddToCartModal
        isOpen={showAddToCartModal}
        onClose={() => setShowAddToCartModal(false)}
        productName={product.name}
      />
    </div>
  );
}
