import React, { useState } from 'react';
import {
  View,
  Text,
  TextInput,
  TouchableOpacity,
  FlatList,
  StyleSheet,
  Dimensions,
  KeyboardAvoidingView,
  Platform,
  Modal,
  Keyboard,
} from 'react-native';
import { fetchSongs } from '@/service/api';
import { addToFavoritesStorage } from '@/service/storage';
import { Song, Criteria } from '@/types/song';
import { API_FIELDS } from '@/constants/apiFields';
import Loading from '@/components/Loading';

interface Option {
  label: string;
  value: Criteria;
}

export default function SearchScreen() {
  const [keyword, setKeyword] = useState<string>('');
  const [criteria, setCriteria] = useState<Criteria>(API_FIELDS.TITLE);
  const [results, setResults] = useState<Song[]>([]);
  const [isDropdownVisible, setIsDropdownVisible] = useState<boolean>(false);
  const [isLoading, setIsLoading] = useState<boolean>(false); // 로딩 상태 추가

  const options: Option[] = [
    { label: '제목', value: API_FIELDS.TITLE },
    { label: '가수', value: API_FIELDS.SINGER },
  ];

  const handleSearch = async (): Promise<void> => {
    if (!keyword.trim()) return; // 빈 검색어 처리
    setIsLoading(true); // 검색 시작 시 로딩 시작
    Keyboard.dismiss();
    try {
      const filtered: Song[] = await fetchSongs(criteria, keyword);
      setResults(filtered);
    } finally {
      setIsLoading(false); // 검색 완료 시 로딩 종료
    }
  };

  const handleAddToFavorites = async (song: Song): Promise<void> => {
    const success: boolean = await addToFavoritesStorage(song);
    if (!success) {
      console.log('Failed to add to favorites');
    }
  };

  const handleSelectOption = (value: Criteria): void => {
    setCriteria(value);
    setIsDropdownVisible(false);
  };

  return (
    <KeyboardAvoidingView
      style={styles.container}
      behavior={Platform.OS === 'ios' ? 'padding' : undefined}
    >
      <View style={styles.searchRow}>
        <View style={styles.dropdownWrapper}>
          <TouchableOpacity
            style={styles.dropdownButton}
            onPress={() => setIsDropdownVisible(!isDropdownVisible)}
          >
            <Text style={styles.dropdownText}>
              {options.find((opt) => opt.value === criteria)?.label || '선택'}
            </Text>
            <Text style={styles.dropdownArrow}>▼</Text>
          </TouchableOpacity>

          <Modal
            transparent
            visible={isDropdownVisible}
            animationType="fade"
            onRequestClose={() => setIsDropdownVisible(false)}
          >
            <TouchableOpacity
              style={styles.modalOverlay}
              onPress={() => setIsDropdownVisible(false)}
            >
              <View style={styles.dropdownMenu}>
                {options.map((option) => (
                  <TouchableOpacity
                    key={option.value}
                    style={styles.dropdownItem}
                    onPress={() => handleSelectOption(option.value)}
                  >
                    <Text style={styles.dropdownItemText}>{option.label}</Text>
                  </TouchableOpacity>
                ))}
              </View>
            </TouchableOpacity>
          </Modal>
        </View>

        <TextInput
          placeholder="검색어 입력"
          value={keyword}
          onChangeText={(text: string) => setKeyword(text)}
          onSubmitEditing={handleSearch}
          style={styles.input}
          returnKeyType="search"
        />

        <TouchableOpacity onPress={handleSearch} style={styles.searchButton}>
          <Text style={styles.searchText}>검색</Text>
        </TouchableOpacity>
      </View>

      {isLoading ? (
        <Loading /> // 로딩 중일 때 Loading 컴포넌트 표시
      ) : (
        <FlatList<Song>
          data={results}
          keyExtractor={(item) => item.no}
          renderItem={({ item }) => (
            <TouchableOpacity onPress={() => handleAddToFavorites(item)}>
              <View style={styles.item}>
                <Text>
                  {item.no} - {item.title} ({item.singer})
                </Text>
              </View>
            </TouchableOpacity>
          )}
          ListEmptyComponent={<Text>검색 결과가 없습니다.</Text>}
          contentContainerStyle={{ flexGrow: 1 }}
        />
      )}
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    padding: 16,
  },
  searchRow: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 16,
    width: '100%',
  },
  dropdownWrapper: {
    width: Dimensions.get('window').width * 0.3 - 24,
    marginRight: 8,
  },
  dropdownButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    borderWidth: 1,
    borderColor: '#ccc',
    borderRadius: 8,
    paddingHorizontal: 10,
    paddingVertical: 10,
    height: 40,
    backgroundColor: '#fff',
  },
  dropdownText: {
    fontSize: 16,
    color: '#000',
  },
  dropdownArrow: {
    fontSize: 12,
    color: '#000',
  },
  modalOverlay: {
    flex: 1,
    backgroundColor: 'rgba(0, 0, 0, 0.2)',
    justifyContent: 'flex-start',
    paddingTop: 120,
    paddingHorizontal: 16,
  },
  dropdownMenu: {
    backgroundColor: '#fff',
    borderRadius: 8,
    width: Dimensions.get('window').width * 0.3 - 24,
    elevation: 5,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.2,
    shadowRadius: 4,
  },
  dropdownItem: {
    paddingVertical: 10,
    paddingHorizontal: 10,
    borderBottomWidth: 1,
    borderBottomColor: '#eee',
  },
  dropdownItemText: {
    fontSize: 16,
    color: '#000',
  },
  input: {
    flex: 1,
    height: 40,
    borderWidth: 1,
    borderColor: '#ccc',
    borderRadius: 8,
    paddingHorizontal: 8,
    marginRight: 8,
  },
  searchButton: {
    backgroundColor: '#007AFF',
    paddingHorizontal: 8,
    paddingVertical: 10,
    borderRadius: 8,
  },
  searchText: {
    color: '#fff',
    fontWeight: 'bold',
  },
  item: {
    padding: 12,
    borderBottomWidth: 1,
    borderBottomColor: '#eee',
    width: Dimensions.get('window').width - 32,
  },
});