'use client'

import { useState, useEffect } from 'react'
import { StarIcon } from '@heroicons/react/20/solid'
import { HeartIcon, ShoppingCartIcon } from '@heroicons/react/24/outline'
import { HeartIcon as HeartIconSolid } from '@heroicons/react/24/solid'
import PageLayout from '../components/PageLayout'

// Mock-Produktdaten im Tailwind UI Plus Format
const products = [
  {
    id: 1,
    name: 'Premium Bio-Kaffee Starter Set',
    price: '€24.99',
    rating: 5,
    reviewCount: 142,
    imageSrc: 'https://images.unsplash.com/photo-1559056199-641a0ac8b55e?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Premium Bio-Kaffee Set mit Bohnen und Filter',
    href: '#',
    category: 'Getränke',
    inStock: true,
  },
  {
    id: 2,
    name: 'Nachhaltiger Laptop-Ständer',
    price: '€89.99',
    rating: 5,
    reviewCount: 87,
    imageSrc: 'https://images.unsplash.com/photo-1527864550417-7fd91fc51a46?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Ergonomischer Laptop-Ständer aus Bambus',
    href: '#',
    category: 'Technik',
    inStock: true,
  },
  {
    id: 3,
    name: 'Öko-Sportbekleidung Set',
    price: '€149.99',
    rating: 5,
    reviewCount: 203,
    imageSrc: 'https://images.unsplash.com/photo-1506629905607-b5f9a71351e8?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Nachhaltige Sportkleidung aus recycelten Materialien',
    href: '#',
    category: 'Kleidung',
    inStock: false,
  },
  {
    id: 4,
    name: 'Smart Home Energie-Monitor',
    price: '€199.99',
    rating: 4,
    reviewCount: 156,
    imageSrc: 'https://images.unsplash.com/photo-1558618666-fcd25c85cd64?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Smart Home Gerät zur Energieüberwachung',
    href: '#',
    category: 'Technik',
    inStock: true,
  },
  {
    id: 5,
    name: 'Bio-Hautpflege Starter-Set',
    price: '€79.99',
    rating: 4,
    reviewCount: 92,
    imageSrc: 'https://images.unsplash.com/photo-1556228578-8c89e6adf883?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Natürliche Hautpflege Produkte ohne Chemikalien',
    href: '#',
    category: 'Beauty',
    inStock: true,
  },
  {
    id: 6,
    name: 'Solarbetriebene Powerbank',
    price: '€129.99',
    rating: 5,
    reviewCount: 78,
    imageSrc: 'https://images.unsplash.com/photo-1609091839311-d5365f9ff1c5?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Portable Solarenergie Powerbank',
    href: '#',
    category: 'Technik',
    inStock: true,
  },
  {
    id: 7,
    name: 'Nachhaltige Trinkflasche',
    price: '€25.99',
    rating: 4,
    reviewCount: 64,
    imageSrc: 'https://images.unsplash.com/photo-1523362628745-0c100150b504?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Wiederverwendbare Edelstahl Trinkflasche',
    href: '#',
    category: 'Lifestyle',
    inStock: true,
  },
  {
    id: 8,
    name: 'Öko-Notizbuch Set',
    price: '€19.99',
    rating: 5,
    reviewCount: 41,
    imageSrc: 'https://images.unsplash.com/photo-1544716278-ca5e3f4abd8c?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Recyceltes Papier Notizbuch Set',
    href: '#',
    category: 'Büro',
    inStock: true,
  },
  {
    id: 9,
    name: 'Bambus Handy-Halterung',
    price: '€32.99',
    rating: 4,
    reviewCount: 24,
    imageSrc: 'https://images.unsplash.com/photo-1572635196237-14b3f281503f?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&q=80',
    imageAlt: 'Nachhaltige Bambus Handy-Halterung',
    href: '#',
    category: 'Technik',
    inStock: true,
  },
]

function classNames(...classes: (string | undefined | null | boolean)[]): string {
  return classes.filter(Boolean).join(' ')
}

export default function ShopPage() {
  const [favorites, setFavorites] = useState<number[]>([])
  const [isLoading, setIsLoading] = useState(true)

  // Load favorites from localStorage on component mount
  useEffect(() => {
    const savedFavorites = localStorage.getItem('shop-favorites')
    if (savedFavorites) {
      try {
        setFavorites(JSON.parse(savedFavorites))
      } catch (error) {
        console.error('Error parsing favorites from localStorage:', error)
      }
    }
    setIsLoading(false)
  }, [])

  // Save favorites to localStorage whenever favorites change
  useEffect(() => {
    if (!isLoading) {
      localStorage.setItem('shop-favorites', JSON.stringify(favorites))
    }
  }, [favorites, isLoading])

  const toggleFavorite = (productId: number) => {
    setFavorites(prev => {
      const newFavorites = prev.includes(productId) 
        ? prev.filter(id => id !== productId)
        : [...prev, productId]
      
      // Show feedback to user
      const product = products.find(p => p.id === productId)
      if (product) {
        if (newFavorites.includes(productId)) {
          console.log(`❤️ ${product.name} zu Favoriten hinzugefügt`)
        } else {
          console.log(`💔 ${product.name} aus Favoriten entfernt`)
        }
      }
      
      return newFavorites
    })
  }

  const addToCart = (productId: number) => {
    const product = products.find(p => p.id === productId)
    if (product) {
      console.log(`🛒 ${product.name} zum Warenkorb hinzugefügt`)
      // Hier würde die echte Add-to-Cart Logik implementiert werden
      // z.B. API-Call oder Zustand-Update
    }
  }

  if (isLoading) {
    return (
      <PageLayout>
        <div className="min-h-screen flex items-center justify-center">
          <div className="text-center">
            <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-[#8D6B1D] mx-auto mb-4"></div>
            <p className="text-[#4A4A4A]">Shop wird geladen...</p>
          </div>
        </div>
      </PageLayout>
    )
  }

  return (
    <PageLayout>
      <div className="bg-white">
        {/* Header Section */}
        <div className="bg-[#0F172A] text-white py-16">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
            <div className="text-center">
              <h1 className="text-4xl font-bold mb-4">Profit Planet Shop</h1>
              <p className="text-xl text-gray-300 max-w-2xl mx-auto">
                Entdecke nachhaltige und innovative Produkte, die sowohl deinem Geldbeutel als auch dem Planeten helfen
              </p>
            </div>
          </div>
        </div>

        {/* Products Section - Tailwind UI Plus "Product Grid" */}
        <div className="mx-auto max-w-2xl px-4 py-16 sm:px-6 sm:py-24 lg:max-w-7xl lg:px-8">
          <h2 className="sr-only">Products</h2>

          <div className="grid grid-cols-1 gap-x-6 gap-y-10 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 xl:gap-x-8">
            {products.map((product) => (
              <a key={product.id} href={product.href} className="group">
                <div className="relative">
                  {/* Product Image */}
                  <div className="aspect-h-1 aspect-w-1 w-full overflow-hidden rounded-lg bg-gray-200 xl:aspect-h-8 xl:aspect-w-7">
                    <img
                      alt={product.imageAlt}
                      src={product.imageSrc}
                      className="h-full w-full object-cover object-center group-hover:opacity-75"
                    />
                    
                    {/* Favorite Button - Now with better positioning */}
                    <button
                      onClick={(e) => {
                        e.preventDefault()
                        e.stopPropagation()
                        toggleFavorite(product.id)
                      }}
                      className={classNames(
                        'absolute top-3 right-3 rounded-full bg-white p-2 text-gray-400 shadow-sm hover:bg-gray-50 hover:text-gray-500 focus:outline-none focus:ring-2 focus:ring-[#8D6B1D]',
                        'opacity-0 transition-opacity group-hover:opacity-100',
                        favorites.includes(product.id) ? 'opacity-100 text-red-500 hover:text-red-600' : ''
                      )}
                      title={favorites.includes(product.id) ? 'Aus Favoriten entfernen' : 'Zu Favoriten hinzufügen'}
                    >
                      {favorites.includes(product.id) ? (
                        <HeartIconSolid className="h-5 w-5" />
                      ) : (
                        <HeartIcon className="h-5 w-5" />
                      )}
                    </button>

                    {/* Category Badge */}
                    <div className="absolute top-3 left-3">
                      <span className="inline-flex items-center rounded-full bg-[#8D6B1D] px-2 py-1 text-xs font-medium text-white">
                        {product.category}
                      </span>
                    </div>

                    {/* Out of Stock Overlay */}
                    {!product.inStock && (
                      <div className="absolute inset-0 flex items-center justify-center rounded-lg bg-black bg-opacity-50">
                        <span className="rounded-md bg-white px-3 py-1 text-sm font-semibold text-gray-900">
                          Ausverkauft
                        </span>
                      </div>
                    )}
                  </div>

                  {/* Product Info */}
                  <div className="mt-4 flex justify-between">
                    <div>
                      <h3 className="text-sm text-gray-700">
                        {product.name}
                      </h3>
                      
                      {/* Rating */}
                      <div className="mt-1 flex items-center">
                        <div className="flex items-center">
                          {[0, 1, 2, 3, 4].map((rating) => (
                            <StarIcon
                              key={rating}
                              aria-hidden="true"
                              className={classNames(
                                product.rating > rating ? 'text-yellow-400' : 'text-gray-300',
                                'h-4 w-4 flex-shrink-0'
                              )}
                            />
                          ))}
                        </div>
                        <p className="ml-1 text-sm text-gray-500">({product.reviewCount})</p>
                      </div>
                    </div>
                    <p className="text-lg font-medium text-gray-900">{product.price}</p>
                  </div>

                  {/* Add to Cart Button */}
                  <button
                    onClick={(e) => {
                      e.preventDefault()
                      e.stopPropagation()
                      addToCart(product.id)
                    }}
                    disabled={!product.inStock}
                    className={classNames(
                      'mt-4 flex w-full items-center justify-center rounded-md border border-transparent px-8 py-2 text-sm font-medium focus:outline-none focus:ring-2 focus:ring-[#8D6B1D] focus:ring-offset-2',
                      product.inStock
                        ? 'bg-[#8D6B1D] text-white hover:bg-[#7A5E1A]'
                        : 'bg-gray-100 text-gray-400 cursor-not-allowed'
                    )}
                  >
                    <ShoppingCartIcon className="mr-2 h-4 w-4" />
                    {product.inStock ? 'In den Warenkorb' : 'Ausverkauft'}
                  </button>
                </div>
              </a>
            ))}
          </div>
        </div>
      </div>
    </PageLayout>
  )
}