import { useState, useEffect, useMemo } from 'react';
import { useRouter } from 'next/router';
import { VOCAB, collectionDisplayName } from './collection-vocabulary.js';

/**
 * Card/collection page state and handlers (god-component split).
 */
export function useCardDetail({ user, authLoading }) {
  const router = useRouter();
  const isAdmin = user?.role === 'admin';
  const adminLoading = authLoading;
  const { id } = router.query;
  
  const [card, setCard] = useState(null);
  const [loading, setLoading] = useState(true);
  const [activeTab, setActiveTab] = useState('details');
  const [ownedQuantity, setOwnedQuantity] = useState(0);
  const [showQuantityModal, setShowQuantityModal] = useState(false);
  const [showCollectionModal, setShowCollectionModal] = useState(false);
  const [showDeckModal, setShowDeckModal] = useState(false);
  const [selectedCollection, setSelectedCollection] = useState('');
  const [selectedDeck, setSelectedDeck] = useState('');
  const [quantity, setQuantity] = useState(1);
  const [isFavorited, setIsFavorited] = useState(false);
  const [collections, setCollections] = useState([]);
  const [decks, setDecks] = useState([]);
  const [cardCollections, setCardCollections] = useState([]);
  const [cardDecks, setCardDecks] = useState([]);
  
  // Mana symbol settings
  const [manaSymbolSettings, setManaSymbolSettings] = useState({ useSVG: false });

  // Fetch card data from API
  useEffect(() => {
    const fetchCard = async () => {
      if (!id) return;
      
      try {
        const response = await fetch(`/api/cards/${id}`);
        if (response.ok) {
          const cardData = await response.json();
          setCard(cardData);
          
          // Fetch user's ownership of this card
          const token = localStorage.getItem('auth_token');
          if (token) {
            try {
              const ownershipResponse = await fetch(`/api/cards/${id}/ownership`, {
                headers: { 'Authorization': `Bearer ${token}` }
              });
              if (ownershipResponse.ok) {
                const ownershipData = await ownershipResponse.json();
                setOwnedQuantity(ownershipData.quantity || 0);
              }
            } catch (error) {
              console.error('Error fetching ownership:', error);
            }
  
            // Check if card is favorited
            try {
              const favoritesResponse = await fetch(`/api/favorites?type=card`, {
                headers: { 'Authorization': `Bearer ${token}` }
              });
              if (favoritesResponse.ok) {
                const favoritesData = await favoritesResponse.json();
                const isCardFavorited = favoritesData.favorites.some(fav => fav.item_id == id);
                setIsFavorited(isCardFavorited);
              }
            } catch (error) {
              console.error('Error checking favorites:', error);
            }
          }
        } else {
          console.error('Failed to fetch card');
        }
      } catch (error) {
        console.error('Error fetching card:', error);
      } finally {
        setLoading(false);
      }
    };
  
    fetchCard();
  }, [id]);
  
  // Fetch user's collections and decks
  useEffect(() => {
    const fetchUserData = async () => {
      try {
        const token = localStorage.getItem('auth_token');
        const headers = {
          'Authorization': `Bearer ${token}`
        };
  
        // Fetch collections
        const collectionsResponse = await fetch('/api/collections', { headers });
        if (collectionsResponse.ok) {
          const collectionsData = await collectionsResponse.json();
          setCollections(collectionsData);
        }
  
        // Fetch decks
        const decksResponse = await fetch('/api/decks', { headers });
        if (decksResponse.ok) {
          const decksData = await decksResponse.json();
          setDecks(decksData);
        }
  
        // Fetch card's current collections and decks
        if (card) {
          const cardCollectionsResponse = await fetch(`/api/cards/${id}/collections`, { headers });
          if (cardCollectionsResponse.ok) {
            const cardCollectionsData = await cardCollectionsResponse.json();
            setCardCollections(cardCollectionsData);
          }
  
          const cardDecksResponse = await fetch(`/api/cards/${id}/decks`, { headers });
          if (cardDecksResponse.ok) {
            const cardDecksData = await cardDecksResponse.json();
            setCardDecks(cardDecksData);
          }
        }
      } catch (error) {
        console.error('Error fetching user data:', error);
      }
    };
  
    if (card) {
      fetchUserData();
    }
  }, [card, id]);
  
  const getRarityGradient = (rarity) => {
    const rarityKey = rarity?.toLowerCase();
    const gradients = {
      'common': '#9ca3af, #6b7280, #4b5563',           // Subtle gray glow
      'uncommon': '#10b981, #059669, #047857',         // Green glow
      'rare': '#f59e0b, #d97706, #b45309',             // Gold glow
      'mythic': '#fbbf24, #f59e0b, #d97706',           // Rich gold glow
      'holographic': '#ec4899, #db2777, #be185d',     // Pink glow
      'enchanted': '#a855f7, #9333ea, #7c3aed',       // Purple glow
      'super rare': '#3b82f6, #2563eb, #1d4ed8',       // Blue glow
      'legendary': '#fbbf24, #f59e0b, #ea580c'         // Vibrant gold-orange glow
    };
    return gradients[rarityKey] || '#6b7280, #4b5563, #374151';
  };
  
  const getParticleCount = (rarity) => {
    const rarityKey = rarity?.toLowerCase();
    const particleCounts = {
      'common': 0,
      'uncommon': 15,
      'rare': 25,
      'mythic': 40,
      'holographic': 50,
      'enchanted': 60,
      'super rare': 45,
      'legendary': 80
    };
    return particleCounts[rarityKey] || 0;
  };
  
  const particleStyles = useMemo(() => {
    if (!card) return [];
    const count = getParticleCount(card.rarity);
    return Array.from({ length: count }, (_, i) => ({
      left: `${((i * 37) % 100)}%`,
      top: `${((i * 53) % 100)}%`,
      animationDelay: `${i % 3}s`,
      animationDuration: `${3 + (i % 2)}s`,
    }));
    // eslint-disable-next-line react-hooks/exhaustive-deps -- stable decorative layout per card id/rarity
  }, [card?.id, card?.rarity]);
  
  const getParticleColor = (rarity) => {
    const rarityKey = rarity?.toLowerCase();
    const colors = {
      'common': '#ffffff',
      'uncommon': '#10b981',
      'rare': '#f59e0b',
      'mythic': '#ffd700',
      'holographic': '#ff6b6b',
      'enchanted': '#a855f7',
      'super rare': '#3b82f6',
      'legendary': '#ffd700'
    };
    return colors[rarityKey] || '#ffffff';
  };
  
  const getTCGIcon = (game) => {
    const icons = {
      'MTG': '🔮',
      'Pokemon': '⚡',
      'Lorcana': '✨'
    };
    return icons[game] || '🃏';
  };
  
  const formatCurrency = (amount) => {
    if (!amount) return '$0.00';
    return new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: 'USD'
    }).format(amount);
  };
  
  const getRarityLabel = (rarity) => {
    const rarityMap = {
      'common': 'Common',
      'uncommon': 'Uncommon',
      'rare': 'Rare',
      'mythic': 'Mythic',
      'holographic': 'Holographic',
      'enchanted': 'Enchanted',
      'super rare': 'Super Rare',
      'legendary': 'Legendary'
    };
    return rarityMap[rarity?.toLowerCase()] || rarity;
  };
  
  const getRarityColor = (rarity) => {
    const colors = {
      'common': '#6B7280',
      'uncommon': '#10B981',
      'rare': '#F59E0B',
      'mythic': '#FFD700',
      'holographic': '#FF6B6B',
      'enchanted': '#A855F7',
      'super rare': '#3B82F6',
      'legendary': '#FFD700'
    };
    return colors[rarity?.toLowerCase()] || '#6B7280';
  };
  
  const handleOwnershipUpdate = async (newQuantity) => {
    try {
      const token = localStorage.getItem('auth_token');
      const response = await fetch(`/api/cards/${id}/ownership`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`
        },
        body: JSON.stringify({ quantity: newQuantity })
      });
  
      if (response.ok) {
        setOwnedQuantity(newQuantity);
        setShowQuantityModal(false);
      } else {
        console.error('Failed to update ownership');
      }
    } catch (error) {
      console.error('Error updating ownership:', error);
    }
  };
  
  const handleAddToCollection = async () => {
    try {
      const token = localStorage.getItem('auth_token');
      const headers = {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`
      };
  
      const response = await fetch(`/api/cards/${id}/collections`, {
        method: 'POST',
        headers,
        body: JSON.stringify({ collectionId: selectedCollection })
      });
  
      if (response.ok) {
        // Refresh card collections
        const cardCollectionsResponse = await fetch(`/api/cards/${id}/collections`, { 
          headers: { 'Authorization': `Bearer ${token}` }
        });
        if (cardCollectionsResponse.ok) {
          const cardCollectionsData = await cardCollectionsResponse.json();
          setCardCollections(cardCollectionsData);
        }
        setShowCollectionModal(false);
        setSelectedCollection('');
      } else {
        console.error('Failed to add to collection');
      }
    } catch (error) {
      console.error('Error adding to collection:', error);
    }
  };
  
  const handleAddToDeck = async () => {
    try {
      const token = localStorage.getItem('auth_token');
      const headers = {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`
      };
  
      const response = await fetch(`/api/cards/${id}/decks`, {
        method: 'POST',
        headers,
        body: JSON.stringify({ deckId: selectedDeck })
      });
  
      if (response.ok) {
        // Refresh card decks
        const cardDecksResponse = await fetch(`/api/cards/${id}/decks`, {
          headers: { 'Authorization': `Bearer ${token}` }
        });
        if (cardDecksResponse.ok) {
          const cardDecksData = await cardDecksResponse.json();
          setCardDecks(cardDecksData);
        }
        setShowDeckModal(false);
        setSelectedDeck('');
      } else {
        console.error('Failed to add to deck');
      }
    } catch (error) {
      console.error('Error adding to deck:', error);
    }
  };
  
  const handleToggleFavorite = async () => {
    try {
      const token = localStorage.getItem('auth_token');
      const response = await fetch(`/api/cards/${id}/favorite`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`
        },
        body: JSON.stringify({ favorited: !isFavorited })
      });
  
      if (response.ok) {
        setIsFavorited(!isFavorited);
      } else {
        console.error('Failed to toggle favorite');
      }
    } catch (error) {
      console.error('Error toggling favorite:', error);
    }
  };

  const showInitialLoading = authLoading || loading;

  return {
    activeTab,
    card,
    cardCollections,
    cardDecks,
    collections,
    decks,
    formatCurrency,
    getParticleColor,
    getParticleCount,
    getRarityColor,
    getRarityGradient,
    getRarityLabel,
    getTCGIcon,
    handleAddToCollection,
    handleAddToDeck,
    handleOwnershipUpdate,
    handleToggleFavorite,
    id,
    isAdmin,
    adminLoading,
    isFavorited,
    loading,
    manaSymbolSettings,
    ownedQuantity,
    particleStyles,
    getParticleCount,
    quantity,
    router,
    selectedCollection,
    selectedDeck,
    setActiveTab,
    setCard,
    setCardCollections,
    setCardDecks,
    setCollections,
    setDecks,
    setIsFavorited,
    setLoading,
    setManaSymbolSettings,
    setOwnedQuantity,
    setQuantity,
    setSelectedCollection,
    setSelectedDeck,
    setShowCollectionModal,
    setShowDeckModal,
    setShowQuantityModal,
    showCollectionModal,
    showDeckModal,
    showInitialLoading,
    showQuantityModal
  };
}