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import React, { useState, useEffect, useCallback } from 'react';
import { debounce } from 'lodash';

interface SearchResult {
  id: string;
  title: string;
  description: string;
  url: string;
  type: 'post' | 'project' | 'page';
  score: number;
}

interface SearchProps {
  onResultSelect: (result: SearchResult) => void;
  placeholder?: string;
  maxResults?: number;
}

interface SearchState {
  query: string;
  results: SearchResult[];
  loading: boolean;
  error: string | null;
}

const useSearch = (maxResults: number = 10) => {
  const [state, setState] = useState<SearchState>({
    query: '',
    results: [],
    loading: false,
    error: null,
  });

  const performSearch = useCallback(async (query: string): Promise<void> => {
    if (!query.trim()) {
      setState(prev => ({ ...prev, results: [], loading: false }));
      return;
    }

    setState(prev => ({ ...prev, loading: true, error: null }));

    try {
      const response = await fetch('/api/search', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ query, maxResults }),
      });

      if (!response.ok) {
        throw new Error(`Search failed: ${response.statusText}`);
      }

      const results: SearchResult[] = await response.json();
      
      setState(prev => ({
        ...prev,
        results,
        loading: false,
      }));
    } catch (error) {
      setState(prev => ({
        ...prev,
        error: error instanceof Error ? error.message : 'Unknown error',
        loading: false,
      }));
    }
  }, [maxResults]);

  const debouncedSearch = useCallback(
    debounce(performSearch, 300),
    [performSearch]
  );

  useEffect(() => {
    debouncedSearch(state.query);
    
    return () => {
      debouncedSearch.cancel();
    };
  }, [state.query, debouncedSearch]);

  const setQuery = useCallback((query: string) => {
    setState(prev => ({ ...prev, query }));
  }, []);

  return { ...state, setQuery };
};

export const SearchComponent: React.FC<SearchProps> = ({ 
  onResultSelect, 
  placeholder = "Search...", 
  maxResults = 10 
}) => {
  const { query, results, loading, error, setQuery } = useSearch(maxResults);
  const [selectedIndex, setSelectedIndex] = useState(-1);

  const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
    switch (e.key) {
      case 'ArrowDown':
        e.preventDefault();
        setSelectedIndex(prev => 
          Math.min(prev + 1, results.length - 1)
        );
        break;
        
      case 'ArrowUp':
        e.preventDefault();
        setSelectedIndex(prev => Math.max(prev - 1, -1));
        break;
        
      case 'Enter':
        e.preventDefault();
        if (selectedIndex >= 0 && results[selectedIndex]) {
          onResultSelect(results[selectedIndex]);
        }
        break;
        
      case 'Escape':
        setQuery('');
        setSelectedIndex(-1);
        break;
    }
  }, [results, selectedIndex, onResultSelect, setQuery]);

  const getResultIcon = (type: SearchResult['type']): string => {
    switch (type) {
      case 'post': return '📝';
      case 'project': return '🚀';
      default: return '📄';
    }
  };

  return (
    <div className="search-container">
      <div className="search-input-wrapper">
        <input
          type="text"
          value={query}
          onChange={(e) => setQuery(e.target.value)}
          onKeyDown={handleKeyDown}
          placeholder={placeholder}
          className="search-input"
          aria-label="Search"
        />
        
        {loading && <div className="search-spinner">⏳</div>}
      </div>

      {error && (
        <div className="search-error" role="alert">
          Error: {error}
        </div>
      )}

      {results.length > 0 && (
        <ul className="search-results" role="listbox">
          {results.map((result, index) => (
            <li
              key={result.id}
              className={`search-result ${index === selectedIndex ? 'selected' : ''}`}
              onClick={() => onResultSelect(result)}
              role="option"
              aria-selected={index === selectedIndex}
            >
              <div className="result-icon">{getResultIcon(result.type)}</div>
              <div className="result-content">
                <h3 className="result-title">{result.title}</h3>
                <p className="result-description">{result.description}</p>
                <span className="result-type">{result.type}</span>
              </div>
            </li>
          ))}
        </ul>
      )}
    </div>
  );
};

export default SearchComponent;