import { FlatList, SafeAreaView, ScrollView, StyleSheet, Text, TouchableOpacity, View } from 'react-native'
import React, { useState } from 'react'
import colors from '../../constants/colors'
import { horizontalScale, moderateScale, verticalScale } from '../../constants/metrics'
import { navigateToArticle, useConstructor } from '../../utils/functions'
import IonIcon from 'react-native-vector-icons/Ionicons'
import { Checkbox, IconButton, List, Modal, PaperProvider, Portal, ToggleButton } from 'react-native-paper'
import { getArticlesBySearch} from '../../api/data'
import NewscoutCenteredTitleHeader from '../../components/molecules/Header/NewscoutCenteredTitleHeader'
import LoadingScreen from '../../components/organisms/Sections/LoadingScreen'
import ThemedTextButton from '../../components/molecules/Buttons/ThemeTextButton'
import fonts from '../../constants/fonts'
import HorizontalNewsCardVariant from '../../components/molecules/Cards/HorizontalNewsCardVariant'

const SearchListPage = props => {
    const {
        navigation,
        route
    } = props

    const params = route.params

    const [filtersData, setFiltersData] = useState({})
    const [currentFilter, setCurrentFilter] = useState("Category")
    const [pagesLoaded, setPagesLoaded] = useState(0)
    const [news, setNews] = useState([])

    const [isFiltersVisible, setFiltersVisible] = useState(false);
    const showFilters = () => setFiltersVisible(true);
    const hideFilters = () => setFiltersVisible(false);

    const styles = StyleSheet.create({
        pageContainer: {
            backgroundColor: colors().dominant
        },
        newsContainer: {
            backgroundColor: colors().dominant,
            minHeight: "100%",
            height: 'auto',
            paddingHorizontal: horizontalScale(16),
            flexDirection: 'row',
            flexWrap: 'wrap',
            gap: moderateScale(8),
            paddingVertical: verticalScale(16),
            numColumns: 2

        },
        filtersModalContainer: {
            padding: moderateScale(16),
            width: '100%',
            height: '100%',
            // marginHorizontal: horizontalScale(32),
            justifyContent: 'flex-start',
            backgroundColor: colors().dominant,
          },
          filtersHeader: {
            flexDirection: 'row',
            alignItems: 'center',
            justifyContent: 'space-between'
          },
          filterHeading: {
            fontFamily: fonts.type.semibold,
            color: colors().recessive,
            fontSize: moderateScale(20)
          },
          utilContainer: {
            flexDirection: 'row',
            gap: 8,
            alignItems: 'center'
          },
          filterPillContainer: {
            paddingVertical: verticalScale(8)
          },
          filterTitle: {
            fontFamily: fonts.type.semibold,
            color: colors().black,
            fontSize: moderateScale(16),
            paddingVertical: moderateScale(8)
          },
          filterPill: {
            borderRadius: moderateScale(18),
            paddingVertical: verticalScale(8),
            paddingHorizontal: horizontalScale(12),
            backgroundColor: colors().dominant,
            width: 'auto',
          },
          selectedFilterPill: {
            paddingVertical: verticalScale(8),
            paddingHorizontal: horizontalScale(8),
            // backgroundColor: colors().primaryColor,
            borderRadius: 0,
            width: 'auto',
            borderColor: colors().primaryColor,
            borderBottomWidth: 3
          },
          selectedPillText: {
            fontFamily: fonts.type.bold,
            fontSize: moderateScale(14),
            color: colors().recessive,
          },
          pillText: {
            fontFamily: fonts.type.semibold,
            fontSize: moderateScale(12),
            color: colors().recessive,
          },
          filterCheckboxes: {
            alignItems: 'flex-start',
            flexDirection:'column',
            gap: moderateScale(8),
            
          },
          listItemText: {
            fontFamily: fonts.type.medium,
            fontSize: moderateScale(14),
            color: colors().recessive
          },
          listItem: {
            paddingVertical: verticalScale(0)
          }
    })

    const applyFilters = () => {
        setNews([])
        hideFilters()
        setPagesLoaded(1)
        fetchSearchResults(params.query, 1, createFilters(filtersData))
    }

    const _clearFilters = (data) => setFiltersData(Object.entries(data).reduce((current,value) => ({...current,[value[0]]:value[1].reduce((prev,item) => ({...prev,[item.key]: false}),{})}),{}))

    const clearAllFilters = () => {
        _clearFilters(filtersData)
    }

    const fetchSearchResults = (search_text, page = 1, filters = "") => {
        getArticlesBySearch(search_text, page, filters)
            .then(res => {
                setNews(prev => [...prev, ...res.data.body.results])
                if (pagesLoaded <= 0){
                    setCurrentFilter(Object.entries(res.data.body.filters)[0][0])
                    _clearFilters(res.data.body.filters)
                    setPagesLoaded(1)
                    console.log(Object.entries(res.data.body.filters)[2][0])
                   
                }
            })
            .catch(err => console.log(err))
    }

    const humanizeFilters = (text) => text.split("_").map(item => item[0].toUpperCase() + item.substring(1)).join(" ")

    const createFilters = (filterObject) => {
        let filterText = ""
        for (const obj of Object.entries(filterObject)) {
            for (const category of Object.entries(obj[1])) {
                if (category[1] === true) {
                    filterText += `&${obj[0]}=${category[0]}`
                }
            }
        }
        return filterText
    }

    useConstructor(() => {
        fetchSearchResults(params.query, 1, createFilters(filtersData))
    })


    return (
        <PaperProvider>
            <SafeAreaView style={styles.pageContainer}>
                <Portal>
                    <Modal visible={isFiltersVisible} onDismiss={hideFilters} contentContainerStyle={styles.filtersModalContainer}>
                        <View style={styles.filtersHeader}>
                            <Text style={styles.filterHeading}>Filters</Text>
                            <View style={styles.utilContainer}>
                                <ThemedTextButton theme={'primary-contained'} title={'Clear All'} buttonStyle={{ paddingVertical: verticalScale(6) }} onPress={clearAllFilters} />

                                <IconButton
                                    icon="close"
                                    iconColor={colors().recessive}
                                    size={moderateScale(24)}
                                    onPress={hideFilters}
                                    style={{ alignSelf: 'flex-end' }}
                                />
                            </View>
                        </View>
                        <View>
                            <ScrollView horizontal contentContainerStyle={styles.filterPillContainer}>
                                <ToggleButton.Group
                                    onValueChange={value => {
                                        setCurrentFilter(value)
                                    }}
                                >
                                    {
                                        Object.keys(filtersData).map(item =>
                                            <ToggleButton
                                                key={item}
                                                icon={() => (
                                                    <Text
                                                        style={[
                                                            item === currentFilter
                                                                ? styles.selectedPillText
                                                                : styles.pillText,
                                                        ]}>
                                                        {humanizeFilters(item)}
                                                    </Text>
                                                )}
                                                style={[
                                                    item === currentFilter
                                                        ? styles.selectedFilterPill
                                                        : styles.filterPill,
                                                    { marginHorizontal: horizontalScale(4) },
                                                ]}
                                                value={item}
                                            />)
                                    }
                                </ToggleButton.Group>
                            </ScrollView>
                        </View>

                        {
                            Object.keys(filtersData).length <= 0 ? <LoadingScreen />
                                :
                                <FlatList
                                    contentContainerStyle={styles.filterCheckboxes}
                                    showsVerticalScrollIndicator={false}
                                    data={Object.entries(filtersData[currentFilter])}
                                    renderItem={filter => <List.Item
                                        key={filter.item[0]}
                                        style={styles.listItem}
                                        titleStyle={styles.listItemText}
                                        title={filter.item[0]}
                                        left={props => <Checkbox
                                            status={filtersData[currentFilter][filter.item[0]] === true ? 'checked' : 'unchecked'}
                                            onPress={() => {
                                                setFiltersData({ ...filtersData, [currentFilter]: { ...filtersData[currentFilter], [filter.item[0]]: !filtersData[currentFilter][filter.item[0]] } })
                                                console.log(filtersData[currentFilter][filter.item[0]])
                                            }}

                                            color={colors().secondaryColor}
                                        />}

                                    />}
                                />}
                        <ThemedTextButton onPress={applyFilters} theme={'secondary-contained'} title={'Apply'} buttonStyle={{ paddingVertical: verticalScale(8), marginTop: verticalScale(8) }} />
                    </Modal>
                </Portal>
                <NewscoutCenteredTitleHeader title={"Search Results"} backButtonShown={true} onBackClick={() => navigation.goBack()}>
                    <TouchableOpacity style={styles.filtersButton} onPress={showFilters}>
                        <IonIcon name="filter" color={colors().primaryColor} size={moderateScale(24)} />
                    </TouchableOpacity>
                </NewscoutCenteredTitleHeader>
                {
                    news.length <= 0 ?
                        <LoadingScreen />
                        :

                        <FlatList
                            contentContainerStyle={styles.newsContainer}
                            showsVerticalScrollIndicator={false}
                            data={news}
                            renderItem={(news) =>
                                <HorizontalNewsCardVariant
                                  onPress={() => navigateToArticle(navigation, news.item.id, news.item.slug)}
                                  timestamp={news.item.published_on}
                                  headline={news.item.title}
                                  image={{ uri: news.item.cover_image }}
                                  category={news.item.category}
                                  tagline={news.item.id}
                                />}
                            keyExtractor={item => item.index}
                            onEndReached={() => {
                                setPagesLoaded(pagesLoaded + 1)
                                fetchSearchResults(params.query,pagesLoaded + 1,createFilters(filtersData))
                            }}
                            onEndReachedThreshold={200}
                        />
                }
            </SafeAreaView>
        </PaperProvider>

    )
}

export default SearchListPage

const styles = StyleSheet.create({})