import { useState, useEffect, useCallback } from 'react';
import { OpenRouterModel } from '../lib/openrouter';

interface UseOpenRouterModelsResult {
  models: OpenRouterModel[];
  filteredModels: OpenRouterModel[];
  loading: boolean;
  error: string | null;
  searchTerm: string;
  setSearchTerm: (term: string) => void;
  selectedCategory: string;
  setSelectedCategory: (category: string) => void;
  refetch: () => Promise<void>;
  categories: string[];
}

export function useOpenRouterModels(): UseOpenRouterModelsResult {
  const [models, setModels] = useState<OpenRouterModel[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [searchTerm, setSearchTerm] = useState('');
  const [selectedCategory, setSelectedCategory] = useState('all');

  const fetchModels = useCallback(async () => {
    if (loading) return; // Prevent multiple simultaneous requests
    
    console.log('🔄 Fetching OpenRouter models...');
    setLoading(true);
    setError(null);
    
    try {
      const url = new URL('/api/openrouter/models', window.location.origin);
      console.log('📡 Requesting:', url.toString());
      
      const response = await fetch(url.toString());
      console.log('📥 Response status:', response.status);
      
      const result = await response.json();
      console.log('📋 Response data:', result);
      
      if (!result.success) {
        throw new Error(result.error || 'Failed to fetch models');
      }
      
      console.log('✅ Successfully fetched', result.data.length, 'models');
      setModels(result.data);
    } catch (err) {
      console.error('❌ Error fetching models:', err);
      setError(err instanceof Error ? err.message : 'Failed to fetch models');
    } finally {
      setLoading(false);
    }
  }, []); // Remove loading dependency to prevent infinite loop

  useEffect(() => {
    fetchModels();
  }, [fetchModels]);

  // Extract categories from model names/descriptions
  const categories = [
    'all',
    ...Array.from(new Set(
      models
        .map(model => {
          const provider = model.id.split('/')[0];
          return provider;
        })
        .filter(Boolean)
    )).sort()
  ];

  // Filter models based on search term and category
  const filteredModels = models.filter(model => {
    const matchesSearch = !searchTerm || 
      model.name.toLowerCase().includes(searchTerm.toLowerCase()) ||
      model.id.toLowerCase().includes(searchTerm.toLowerCase()) ||
      model.description.toLowerCase().includes(searchTerm.toLowerCase());
    
    const matchesCategory = selectedCategory === 'all' || 
      model.id.startsWith(selectedCategory + '/');
    
    return matchesSearch && matchesCategory;
  });

  return {
    models,
    filteredModels,
    loading,
    error,
    searchTerm,
    setSearchTerm,
    selectedCategory,
    setSelectedCategory,
    refetch: fetchModels,
    categories
  };
}