import React, { useState } from 'react';
import {
    View,
    StyleSheet,
    Modal,
    Text,
    TouchableOpacity,
    FlatList,
    TextInput
} from 'react-native';
import colors from "./includes/colors";
import { borderRadius, size } from "./includes/constants";

interface ListItem {
    [key: string]: string;
}

interface SelectOptionProps {
    listItems: ListItem[];
    selectedValueState: { state: ListItem | null; setState: (item: ListItem | null) => void };
    placeHolder: string;
    selectButtonStyle?: object;
    dispatch?: ((action: () => void) => void) | null;
    showLabel?: string;
    itemsPerPage?: number;
}

const SelectOption: React.FC<SelectOptionProps> = ({
                                                       listItems,
                                                       selectedValueState,
                                                       placeHolder,
                                                       selectButtonStyle = {
                                                           alignItems: 'center', justifyContent: 'center',
                                                           backgroundColor: colors.lightGrey,
                                                           borderRadius: borderRadius, elevation: 5, paddingVertical: 7.5, height: '35%'
                                                       },
                                                       dispatch = null,
                                                       showLabel = 'name',
                                                       itemsPerPage = 100
                                                   }) => {
    const [visible, setVisible] = useState<boolean>(false);
    const [searchQuery, setSearchQuery] = useState<string>('');
    const [pageNumber, setPageNumber] = useState<number>(1);

    const toggleModal = () => setVisible(!visible);

    const handleItemPress = (item: ListItem | null) => {
        const updateDis = () => selectedValueState.setState(item);
        dispatch !== null ? dispatch(updateDis) : updateDis();
        toggleModal();
    };

    const loadMoreItems = () => setPageNumber(pageNumber + 1);

    const filteredItems = listItems
        .filter(item => item[showLabel]?.toLowerCase().includes(searchQuery.toLowerCase()))
        .slice(0, pageNumber * itemsPerPage);

    return (
        <View>
            <TouchableOpacity style={selectButtonStyle} onPress={toggleModal}>
                <Text style={{ color: colors.dark, fontSize: size.text, fontWeight: 'normal' }}>
                    {(selectedValueState.state === null
                        || typeof selectedValueState.state === 'number' )?
                        placeHolder :
                        selectedValueState.state[showLabel]}
                </Text>
            </TouchableOpacity>

            <Modal visible={visible} transparent={true} onRequestClose={toggleModal}>
                <View style={styles.modalContainer}>
                    <View style={styles.modalContent}>
                        <TextInput
                            style={styles.searchInput}
                            placeholder={`Search...`}
                            onChangeText={(text) => setSearchQuery(text)}
                            value={searchQuery}
                        />
                        <TouchableOpacity onPress={() => handleItemPress(null)} style={styles.listItem}>
                            <Text style={styles.itemText}>-- {placeHolder} --</Text>
                        </TouchableOpacity>
                        <FlatList
                            data={filteredItems}
                            renderItem={({ item }) => (
                                <TouchableOpacity onPress={() => handleItemPress(item)} style={styles.listItem}>
                                    <Text style={styles.itemText}>{item[showLabel]}</Text>
                                </TouchableOpacity>
                            )}
                            keyExtractor={(item, index) => index.toString()}
                            onEndReached={loadMoreItems}
                            onEndReachedThreshold={0.1}
                        />
                        <TouchableOpacity style={styles.closeButton} onPress={toggleModal}>
                            <Text style={styles.closeButtonText}>Close</Text>
                        </TouchableOpacity>
                    </View>
                </View>
            </Modal>
        </View>
    );
};

const styles = StyleSheet.create({
    modalContainer: {
        flex: 8,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'rgba(0, 0, 0, 0.5)',
    },
    modalContent: {
        backgroundColor: 'white',
        minHeight: '50%',
        maxHeight: '80%',
        minWidth: "80%",
        maxWidth: "90%",
        borderRadius: 30,
        padding: '5%',
    },
    searchInput: {
        borderWidth: 1,
        borderColor: colors.dark,
        borderRadius: borderRadius * 0.4,
        padding: 8,
        marginBottom: 16,
    },
    listItem: {
        paddingVertical: 10,
        borderBottomWidth: 0.5,
        borderBottomColor: colors.grey,
    },
    itemText: {
        fontSize: size.text,
        color: colors.dark,
    },
    closeButton: {
        height: "10%",
        width: "88%",
        backgroundColor: colors.light,
        borderRadius: 10,
        alignItems: 'center',
        justifyContent: 'center',
        marginTop: 20,
        alignSelf: 'center',
    },
    closeButtonText: {
        fontSize: size.label,
        color: colors.red,
    },
});

export default SelectOption;