import React, { useState, useEffect } from 'react';
import {
  StyleSheet, View, Text, TextInput, TouchableOpacity, ActivityIndicator,
} from 'react-native';
import { useTheme } from '../services/ThemeContext';
import DatabaseService from '../services/DatabaseService';
import PhotoGrid from '../components/PhotoGrid';
import MediaViewer from '../components/MediaViewer';

const SearchScreen = ({ route }) => {
  const userId = route?.params?.userId;
  const { theme } = useTheme();
  const [query, setQuery] = useState('');
  const [results, setResults] = useState([]);
  const [searching, setSearching] = useState(false);
  const [selectedMedia, setSelectedMedia] = useState(null);
  const [viewerVisible, setViewerVisible] = useState(false);

  useEffect(() => {
    const timer = setTimeout(() => {
      if (query.trim().length > 0) performSearch();
      else setResults([]);
    }, 300);
    return () => clearTimeout(timer);
  }, [query]);

  const performSearch = async () => {
    if (!userId) return;
    setSearching(true);
    try {
      const media = await DatabaseService.searchMedia(userId, query.trim());
      setResults(media);
    } catch (err) {
      console.error('Search error:', err);
    } finally {
      setSearching(false);
    }
  };

  return (
    <View style={[styles.container, { backgroundColor: theme.background }]}>
      <View style={[styles.searchBar, { backgroundColor: theme.searchBg }]}>
        <Text style={styles.searchIcon}>🔍</Text>
        <TextInput
          style={[styles.searchInput, { color: theme.text }]}
          placeholder="Search photos and videos"
          placeholderTextColor={theme.textTertiary}
          value={query}
          onChangeText={setQuery}
          autoFocus
          autoCapitalize="none"
          autoCorrect={false}
        />
        {query.length > 0 && (
          <TouchableOpacity onPress={() => setQuery('')}>
            <Text style={[styles.clearButton, { color: theme.textSecondary }]}>✕</Text>
          </TouchableOpacity>
        )}
      </View>

      {searching && (
        <View style={styles.loadingContainer}>
          <ActivityIndicator size="small" color={theme.primary} />
        </View>
      )}

      {!searching && query.length > 0 && results.length === 0 && (
        <View style={styles.emptyContainer}>
          <Text style={styles.emptyIcon}>🔍</Text>
          <Text style={[styles.emptyTitle, { color: theme.text }]}>No results</Text>
          <Text style={[styles.emptyText, { color: theme.textSecondary }]}>Try different keywords</Text>
        </View>
      )}

      {query.length === 0 && (
        <View style={styles.emptyContainer}>
          <Text style={styles.emptyIcon}>🔍</Text>
          <Text style={[styles.emptyTitle, { color: theme.text }]}>Search your photos</Text>
          <Text style={[styles.emptyText, { color: theme.textSecondary }]}>Search by title or description</Text>
        </View>
      )}

      {results.length > 0 && (
        <>
          <Text style={[styles.resultCount, { color: theme.textSecondary }]}>
            {results.length} result{results.length !== 1 ? 's' : ''}
          </Text>
          <PhotoGrid
            data={results}
            onItemPress={(item) => { setSelectedMedia(item); setViewerVisible(true); }}
          />
        </>
      )}

      <MediaViewer visible={viewerVisible} media={selectedMedia} onClose={() => setViewerVisible(false)} />
    </View>
  );
};

const styles = StyleSheet.create({
  container: { flex: 1 },
  searchBar: {
    flexDirection: 'row', alignItems: 'center', marginHorizontal: 12,
    marginTop: 48, marginBottom: 8, borderRadius: 24,
    paddingHorizontal: 14, paddingVertical: 10, gap: 8,
  },
  searchIcon: { fontSize: 16 },
  searchInput: { flex: 1, fontSize: 15, padding: 0 },
  clearButton: { fontSize: 16, padding: 4 },
  loadingContainer: { padding: 20, alignItems: 'center' },
  emptyContainer: { flex: 1, justifyContent: 'center', alignItems: 'center', paddingHorizontal: 24 },
  emptyIcon: { fontSize: 48, marginBottom: 12 },
  emptyTitle: { fontSize: 18, fontWeight: '600', marginBottom: 6 },
  emptyText: { fontSize: 13, textAlign: 'center' },
  resultCount: { paddingHorizontal: 16, paddingVertical: 8, fontSize: 13 },
});

export default SearchScreen;