import React, {useEffect, useState} from 'react';
import {
  ScrollView,
  View,
  Text,
  TouchableOpacity,
  Dimensions,
  Image,
  SafeAreaView,
  Platform,
  Modal,
} from 'react-native';
import NavigationService from '../../services/NavigationService';
import {
  COLOR_SCHEME,
  SIZE,
  br,
  ph,
  pv,
  opacity,
  FONT,
  WEIGHT,
} from '../../common/common';
import Icon from 'react-native-vector-icons/Feather';

import {getElevation, h, w, timeSince} from '../../utils/utils';
import {FlatList, TextInput} from 'react-native-gesture-handler';
import {useForceUpdate} from '../../views/ListsEditor';

const refs = [];

export const AddNotebookDialog = ({visible}) => {
  const [colors, setColors] = useState(COLOR_SCHEME);
  const [topicsToAdd, setTopicsToAdd] = useState(['']);
  const forceUpdate = useForceUpdate();
  let prevItem = null;
  let prevIndex = null;
  let currentSelectedItem = null;

  const onSubmit = (text, index, willFocus = true) => {
    let oldData = topicsToAdd;
    oldData[index] = text;

    if (
      oldData.length === index + 1 &&
      prevIndex !== null &&
      prevItem !== null
    ) {
      oldData.push('');
    }

    setTopicsToAdd(oldData);
    forceUpdate();
    currentSelectedItem = null;

    if (!willFocus) return;
    if (!refs[index + 1]) {
      setTimeout(() => {
        refs[index + 1].focus();
      }, 400);
    } else {
      refs[index + 1].focus();
    }
  };
  const onFocus = index => {
    currentSelectedItem = index;
    if (currentSelectedItem) {
      let oldData = topicsToAdd;
      oldData[prevIndex] = prevItem;
      if (oldData.length === prevIndex + 1) {
        oldData.push('');
      }
      prevIndex = null;
      prevItem = null;
      setTopicsToAdd(oldData);
      console.log(oldData);
      forceUpdate();
    }
  };
  const onChange = (text, index) => {
    prevIndex = index;
    prevItem = text;
  };
  const onDelete = index => {
    let listData = topicsToAdd;
    listData.splice(index, 1);
    setTopicsToAdd(listData);
    forceUpdate();
  };

  return (
    <SafeAreaView>
      <Modal visible={visible} transparent={true}>
        <View
          style={{
            width: '100%',
            height: '100%',
            backgroundColor: 'rgba(255,255,255,0.3)',
            justifyContent: 'center',
            alignItems: 'center',
          }}>
          <View
            style={{
              width: '80%',
              maxHeight: '80%',
              elevation: 5,
              borderRadius: 5,
              backgroundColor: colors.bg,
              paddingHorizontal: ph,
              paddingVertical: pv,
            }}>
            <View
              style={{
                flexDirection: 'row',
                justifyContent: 'center',
                alignItems: 'center',
              }}>
              <Icon name="book-open" color={colors.accent} size={SIZE.lg} />
              <Text
                style={{
                  color: colors.accent,
                  fontFamily: WEIGHT.medium,
                  marginLeft: 10,
                  fontSize: SIZE.lg,
                  marginTop: -5,
                }}>
                New Notebook
              </Text>
            </View>

            <TextInput
              style={{
                padding: pv - 5,
                borderWidth: 1.5,
                borderColor: '#f0f0f0',
                paddingHorizontal: ph,
                borderRadius: 5,
                fontSize: SIZE.sm,
                fontFamily: WEIGHT.regular,
                marginTop: 20,
                marginBottom: 10,
              }}
              placeholder="Enter title of notebook"
              placeholderTextColor={colors.icon}
            />

            <Text
              style={{
                fontSize: SIZE.sm,
                fontFamily: WEIGHT.semibold,
              }}>
              Topics
            </Text>

            <FlatList
              data={topicsToAdd}
              renderItem={({item, index}) => (
                <TopicItem
                  item={item}
                  index={index}
                  colors={colors}
                  onSubmit={onSubmit}
                  onChange={onChange}
                  onFocus={onFocus}
                  onDelete={onDelete}
                />
              )}
            />

            <View
              style={{
                justifyContent: 'space-around',
                alignItems: 'center',
                flexDirection: 'row',
                marginTop: 20,
              }}>
              <TouchableOpacity
                activeOpacity={opacity}
                style={{
                  paddingVertical: pv,
                  paddingHorizontal: ph,
                  borderRadius: 5,
                  width: '45%',
                  justifyContent: 'center',
                  alignItems: 'center',
                  borderColor: colors.accent,
                  backgroundColor: colors.accent,
                  borderWidth: 1,
                }}>
                <Text
                  style={{
                    fontFamily: WEIGHT.medium,
                    color: 'white',
                    fontSize: SIZE.sm,
                  }}>
                  Add
                </Text>
              </TouchableOpacity>

              <TouchableOpacity
                activeOpacity={opacity}
                style={{
                  paddingVertical: pv,
                  paddingHorizontal: ph,
                  borderRadius: 5,
                  width: '45%',
                  justifyContent: 'center',
                  alignItems: 'center',
                  backgroundColor: '#f0f0f0',
                }}>
                <Text
                  style={{
                    fontFamily: WEIGHT.medium,
                    color: colors.icon,
                    fontSize: SIZE.sm,
                  }}>
                  Cancel
                </Text>
              </TouchableOpacity>
            </View>
          </View>
        </View>
      </Modal>
    </SafeAreaView>
  );
};

const TopicItem = ({
  item,
  index,
  onFocus,
  onSubmit,
  onDelete,
  onChange,
  colors,
}) => {
  const [focus, setFocus] = useState(true);
  const topicRef = ref => (refs[index] = ref);

  let text = item;

  return (
    <View
      style={{
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'center',
        borderRadius: 5,
        borderWidth: 1.5,
        borderColor: '#f0f0f0',
        paddingHorizontal: ph,
        marginTop: 10,
      }}>
      <TextInput
        ref={topicRef}
        onFocus={() => {
          onFocus(index);

          setFocus(true);
        }}
        onBlur={() => {
          onSubmit(text, index, false);
          setFocus(false);
        }}
        onChangeText={value => {
          onChange(value, index);

          text = value;
        }}
        onSubmit={() => onSubmit(text, index, true)}
        blurOnSubmit
        style={{
          padding: pv - 5,
          paddingHorizontal: 0,
          fontSize: SIZE.sm,
          fontFamily: WEIGHT.regular,
          width: '90%',
          maxWidth: '90%',
        }}
        placeholder="Add a topic"
        placeholderTextColor={colors.icon}
      />

      {index == 0 && !focus ? (
        <TouchableOpacity
          onPress={() =>
            !focus && index !== 0
              ? onDelete(index)
              : onSubmit(text, index, true)
          }
          style={{
            justifyContent: 'center',
            alignItems: 'center',
          }}>
          <Icon
            name={!focus && index !== 0 ? 'minus' : 'plus'}
            size={SIZE.lg}
            color={colors.accent}
          />
        </TouchableOpacity>
      ) : null}
    </View>
  );
};