import React, { useState, useCallback, useMemo } from 'react';
import { useInventoryStore } from '../store/inventoryStore';
import { formatItemName, getItemEmoji, formatCount, ITEM_CATEGORIES, getItemCategory } from '../utils/itemUtils';
import ItemIcon from './ItemIcon';
import './InventoryGrid.css';

function InventoryGrid() {
  const inventory = useInventoryStore((state) => state.inventory);
  const searchQuery = useInventoryStore((state) => state.searchQuery);
  const setSearchQuery = useInventoryStore((state) => state.setSearchQuery);
  const getFilteredItems = useInventoryStore((state) => state.getFilteredItems);
  const orderItem = useInventoryStore((state) => state.orderItem);
  const dropperNicknames = useInventoryStore((state) => state.dropperNicknames) || {};

  const [selectedItemName, setSelectedItemName] = useState(null);
  const [orderAmount, setOrderAmount] = useState(1);
  const [sortBy, setSortBy] = useState('count');
  const [activeCategory, setActiveCategory] = useState('all');
  const [selectedDropper, setSelectedDropper] = useState('');

  // Derive selectedItem from live inventory so count always reflects real-time data
  const selectedItem = useMemo(() => {
    if (!selectedItemName) return null;
    const items = inventory.itemList || [];
    return items.find((i) => i.name === selectedItemName) || null;
  }, [selectedItemName, inventory.itemList]);

  const droppers = inventory.droppers || [];

  const items = getFilteredItems();

  const filteredByCategory = useMemo(() => {
    if (activeCategory === 'all') return items;
    return items.filter((item) => getItemCategory(item.name) === activeCategory);
  }, [items, activeCategory]);

  const sortedItems = useMemo(() => {
    return [...filteredByCategory].sort((a, b) => {
      if (sortBy === 'count') return (b.count || 0) - (a.count || 0);
      if (sortBy === 'name') return (a.displayName || a.name || '').localeCompare(b.displayName || b.name || '');
      return 0;
    });
  }, [filteredByCategory, sortBy]);

  const handleOrder = useCallback(async () => {
    if (!selectedItem || orderAmount <= 0) return;
    await orderItem(selectedItem.name, orderAmount, selectedDropper || undefined);
  }, [selectedItem, orderAmount, orderItem, selectedDropper]);

  const handleItemClick = (item) => {
    setSelectedItemName(item.name);
    setOrderAmount(1);
  };

  // Count items per category for badges
  const categoryCounts = useMemo(() => {
    const counts = { all: items.length };
    for (const cat of ITEM_CATEGORIES) {
      if (cat.id !== 'all') {
        counts[cat.id] = items.filter((item) => getItemCategory(item.name) === cat.id).length;
      }
    }
    return counts;
  }, [items]);

  return (
    <div className="inventory-panel">
      {/* Search & controls bar */}
      <div className="inventory-toolbar">
        <div className="search-box">
          <span className="search-icon">🔍</span>
          <input
            type="text"
            placeholder="Search items..."
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            className="search-input"
          />
          {searchQuery && (
            <button className="search-clear" onClick={() => setSearchQuery('')}>✕</button>
          )}
        </div>
        <div className="sort-controls">
          <button
            className={`mc-btn ${sortBy === 'count' ? 'green' : ''}`}
            onClick={() => setSortBy('count')}
          >
            # Count
          </button>
          <button
            className={`mc-btn ${sortBy === 'name' ? 'green' : ''}`}
            onClick={() => setSortBy('name')}
          >
            A Name
          </button>
        </div>
        <div className="item-count-label">
          {sortedItems.length} types · {(inventory.grandTotal || 0).toLocaleString()} items
        </div>
      </div>

      {/* Creative inventory category tabs */}
      <div className="category-tabs">
        {ITEM_CATEGORIES.map((cat) => (
          <button
            key={cat.id}
            className={`category-tab ${activeCategory === cat.id ? 'active' : ''}`}
            onClick={() => setActiveCategory(cat.id)}
            title={cat.label}
          >
            <ItemIcon itemName={`minecraft:${cat.icon}`} size={20} />
            <span className="category-label">{cat.label}</span>
            {categoryCounts[cat.id] > 0 && (
              <span className="category-count">{categoryCounts[cat.id]}</span>
            )}
          </button>
        ))}
      </div>

      <div className="inventory-body">
        {/* Item grid */}
        <div className="item-grid-wrapper">
          <div className="item-grid">
            {sortedItems.map((item) => (
              <div
                key={item.name}
                className={`item-slot ${selectedItem?.name === item.name ? 'selected' : ''}`}
                onClick={() => handleItemClick(item)}
              >
                <ItemIcon itemName={item.name} size={48} />
                <span className="item-slot-count">{formatCount(item.count)}</span>
                {/* Minecraft-style tooltip */}
                <div className="mc-tooltip">
                  <div className="mc-tooltip-name">{formatItemName(item.name)}</div>
                  <div className="mc-tooltip-count">{(item.count || 0).toLocaleString()} items</div>
                  <div className="mc-tooltip-id">{item.name}</div>
                </div>
              </div>
            ))}
            {sortedItems.length === 0 && (
              <div className="empty-grid">
                {searchQuery ? `No items matching "${searchQuery}"` : activeCategory !== 'all' ? 'No items in this category' : 'No items in storage'}
              </div>
            )}
          </div>
        </div>

        {/* Item detail / order panel */}
        {selectedItem && (
          <div className="item-detail-panel">
            <div className="detail-header">
              <ItemIcon itemName={selectedItem.name || ''} size={48} />
              <div className="detail-info">
                <h3>{formatItemName(selectedItem.name || '')}</h3>
                <span className="detail-id">{selectedItem.name || ''}</span>
              </div>
              <button className="detail-close" onClick={() => setSelectedItemName(null)}>✕</button>
            </div>

            <div className="detail-stats">
              <div className="detail-stat">
                <span className="label">Total</span>
                <span className="value">{(selectedItem.count || 0).toLocaleString()}</span>
              </div>
              <div className="detail-stat">
                <span className="label">Stacks</span>
                <span className="value">
                  {Math.ceil((selectedItem.count || 0) / 64)}
                </span>
              </div>
            </div>

            <div className="order-section">
              <h4>📤 Order Items</h4>
              <div className="order-controls">
                {droppers.length >= 1 && (
                  <div className="dropper-select-wrapper">
                    <label className="dropper-label">📍 Dispense to:</label>
                    <select
                      className="dropper-select"
                      value={selectedDropper}
                      onChange={(e) => setSelectedDropper(e.target.value)}
                    >
                      {droppers.map((d) => {
                        const nick = dropperNicknames[d.name];
                        const shortName = d.name.replace(/^minecraft:/, '');
                        const label = nick
                          ? `${nick} (${shortName})`
                          : `${shortName}${d.isDefault ? ' (default)' : d.clientId ? ` (client ${d.clientId})` : ''}`;
                        return (
                          <option key={d.name} value={d.name}>
                            {label}
                          </option>
                        );
                      })}
                    </select>
                  </div>
                )}
                <div className="order-amount-controls">
                  <button className="mc-btn" onClick={() => setOrderAmount(Math.max(1, orderAmount - 1))}>-</button>
                  <input
                    type="number"
                    className="order-input"
                    value={orderAmount}
                    onChange={(e) => setOrderAmount(Math.max(1, parseInt(e.target.value) || 1))}
                    min="1"
                    max={selectedItem.count || 1}
                  />
                  <button className="mc-btn" onClick={() => setOrderAmount(Math.min(selectedItem.count || 1, orderAmount + 1))}>+</button>
                </div>
                <div className="order-presets">
                  <button className="mc-btn" onClick={() => setOrderAmount(1)}>1</button>
                  <button className="mc-btn" onClick={() => setOrderAmount(16)}>16</button>
                  <button className="mc-btn" onClick={() => setOrderAmount(32)}>32</button>
                  <button className="mc-btn" onClick={() => setOrderAmount(64)}>64</button>
                  <button className="mc-btn" onClick={() => setOrderAmount(selectedItem.count || 1)}>All</button>
                </div>
                <button className="mc-btn green order-btn" onClick={handleOrder}>
                  📤 Dispense x{orderAmount}
                </button>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}

export default InventoryGrid;