import React, { useState, useEffect, useCallback, useMemo } from 'react'
import { View, TouchableOpacity, Text, Animated, StyleSheet, FlatList } from 'react-native'

import { styles } from './styles'
import { types } from './types'
import { defaultProps } from './defaultProps'

const numbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', "", "0", "delete"];

export const CustomPincode = ({
  leftElement,
  leftElementCallback,
  rightElement,
  rightElementCallback,
  bottomElement,
  bottomCallback,
  bottomElementStyle,
  isBottom,
  pinButtonStyle,
  pinTextStyle,
  leftButtonStyle,
  rightButtonStyle,
  leftContainerStyle,
  rightContainerStyle,
  isDeleteButton,
  buttonDeleteElement,
  buttonDeletePosition,
  pinContainerStyles,
  containerStyles,
  isLeft,
  isRight,
  zeroButtonStyle,
  completeCallback,
  pinLength,
  keyButtons,
  pointStyle,
  pointActiveStyle,
  pointsStyle,
  keyPoints,
  pointsLength,
  isPinError,
  errorPointStyles,
  defaultPin
}) => {
  const [pinValues, setPinValues] = useState('');
  const [shakeAnim, setShakeAnim] = useState(new Animated.Value(0))

  const mergeStyles = useCallback((a, b) => ([a, b]), []);

  const handleOnPressNumber = useCallback(
    newVal => {
      if (pinValues.length <= pinLength) {
        setPinValues(v => `${v}${newVal}`)
      }
    },
    [pinLength, pinValues.length],
  );

  const handleOnDeleteLatestValue = useCallback(
    /**
     * @param {boolean} isClearAll
     */
    isClearAll => {
      //typeof like guard here
      setPinValues(v => (typeof isClearAll !== 'object' && isClearAll ? '' : (pinValues.length <= pinLength && isClearAll) ? v.slice(0, -1) : ''))
    },
    [],
  );

  const handleShake = () => {
    const values = [10, -7.5, 5, -2.5, 0];
    const duration = 75;
    Animated.sequence(
      values.map(toValue => Animated.timing(shakeAnim, { toValue, duration, useNativeDriver: false }))
    ).start();
  };

  const renderDelete = useMemo(
    () =>
      (
        <TouchableOpacity style={styles.deleteButton} onPress={handleOnDeleteLatestValue}>
          {buttonDeleteElement}
        </TouchableOpacity>
      ),
    [buttonDeleteElement, handleOnDeleteLatestValue, pinValues],
  );

  const buttonStyles = useMemo(() => mergeStyles(styles.button, pinButtonStyle), [
    mergeStyles,
    pinButtonStyle,
  ]);
  
  const blankStyles = useMemo(() => mergeStyles(styles.blank, pinButtonStyle), [
    mergeStyles,
    pinButtonStyle,
  ]);

  const buttonTextStyle = useMemo(() => mergeStyles(styles.buttonText, pinTextStyle), [
    mergeStyles,
    pinTextStyle,
  ]);

  const renderNumbers = () => {
    return (
      <FlatList 
      numColumns={3}
      data={numbers}
      renderItem={({item}) =>{
        if(item === "") {
          return isDeleteButton && buttonDeletePosition === 'left'
            ? renderDelete
            : isLeft ? (
              <TouchableOpacity style={leftButtonStyle} onPress={leftElementCallback}>
                {leftElement}
              </TouchableOpacity>
            ) :
            <TouchableOpacity
              style={blankStyles}
              key={`${item}-${keyButtons}`}
              onPress={() => handleOnPressNumber(item)}
            >
              <Text style={buttonTextStyle}>{item}</Text>
            </TouchableOpacity>
        }
        if(item === "delete") {
          return isDeleteButton ? renderDelete
            : isRight && (
              <TouchableOpacity style={rightButtonStyle} onPress={rightElementCallback}>
                {rightElement}
              </TouchableOpacity>
            )
        }
        return (
            <TouchableOpacity
              style={buttonStyles}
              key={`${item}-${keyButtons}`}
              onPress={() => handleOnPressNumber(item)}
            >
              <Text style={buttonTextStyle}>{item}</Text>
            </TouchableOpacity>
        )}
      }
      />
    )
  }

  useEffect(() => {
    if (pinValues.length >= pinLength) {
      let isValid = (defaultPin == pinValues)
      completeCallback(pinValues, isValid, handleOnDeleteLatestValue)
      if(!isValid) handleShake()
    }
  }, [completeCallback, handleOnDeleteLatestValue, pinLength, pinValues]);

  const pinStyles = useMemo(
    () => ({
      points: mergeStyles(styles.points, pointsStyle),
      viewContainer: mergeStyles(styles.viewContainer, containerStyles),
      viewPinContainer: mergeStyles(styles.viewPinContainer, pinContainerStyles),
      zeroButton: mergeStyles(buttonStyles, zeroButtonStyle),
      leftButton: mergeStyles(styles.anotherButtons, leftContainerStyle),
      rightButton: mergeStyles(styles.anotherButtons, rightContainerStyle),
      pointActive: mergeStyles(styles.pointActive, pointActiveStyle),
    }),
    [
      mergeStyles,
      pointsStyle,
      containerStyles,
      pinContainerStyles,
      buttonStyles,
      zeroButtonStyle,
      leftContainerStyle,
      rightContainerStyle,
      pointActiveStyle,
    ],
  );

  return (
    <>
      <Animated.View
          style={StyleSheet.flatten([
            { left: pointsLength == 4 ? shakeAnim : null }
          ])}>
          <View style={pinStyles.points}>
            {[...Array(pointsLength || pinLength).keys()].map(point => {
              let currentPointStyle = pointStyle;

              if (isPinError) {
                currentPointStyle = errorPointStyles
              } else if (pinValues[point]) {
                currentPointStyle = pinStyles.pointActive
              }

              currentPointStyle = mergeStyles(styles.point, currentPointStyle);

              return <View style={currentPointStyle} key={`${point}${keyPoints}`} />
            })}
          </View>
          <View style={pinStyles.viewContainer}>
            <View style={pinStyles.viewPinContainer}>
              {renderNumbers()}
              {/* <View style={pinStyles.leftButton}>
                {isDeleteButton && buttonDeletePosition === 'left'
                  ? renderDelete
                  : isLeft && (
                      <TouchableOpacity style={leftButtonStyle} onPress={leftElementCallback}>
                        {leftElement}
                      </TouchableOpacity>
                    )}
              </View>
              <TouchableOpacity style={pinStyles.zeroButton} onPress={() => handleOnPressNumber('0')}>
                <Text style={buttonTextStyle}>0</Text>
              </TouchableOpacity>
              <View style={pinStyles.rightButton}>
                {isDeleteButton && buttonDeletePosition === 'right'
                  ? renderDelete
                  : isRight && (
                      <TouchableOpacity style={rightButtonStyle} onPress={rightElementCallback}>
                        {rightElement}
                      </TouchableOpacity>
                    )}
              </View> */}
            </View>
            {isBottom && (
              <TouchableOpacity style={bottomElementStyle} onPress={bottomCallback}>
                {bottomElement}
              </TouchableOpacity>
            )}
          </View>
      </Animated.View>
    </>
  )
};

CustomPincode.defaultProps = defaultProps;

CustomPincode.propTypes = types;