import React, { useState, useEffect } from 'react'
import { ScrollView, View, Text, TextInput, TextStyle, ViewStyle, StyleProp, StyleSheet, TouchableWithoutFeedback, TextInputProps } from 'react-native';
import { FieldRefType } from '../types'
import Icon from '../Icon'
import renderNode from '../helpers/renderNode'
/**
 * todo 要怎么定义字体大小？
 * todo  报错了 React.ComponentPropsWithRef<typeof TextInput> & 
 */
interface Props extends TextInputProps {
  type?: string,
  disabled?: boolean;
  disabledInputStyle?: StyleProp<ViewStyle>;
  label?: string;
  // todo 字体大小 这个字段是否需要 我认为label只需要简单提供就好了 所以不用太精细
  labelFontSize?: number,
  labelStyle?: StyleProp<ViewStyle>;
  style?: StyleProp<ViewStyle>;
  rightIcon?: string | React.ReactElement<{}>
  onRightIconClick?: () => void;
  clearable?: boolean;
  clearIcon?: string,//清除图标的icon name
  clearIconColor?: string//清除图标的icon 颜色
  onInput?: (value: string) => void
  border?: boolean//是否显示边框
  borderStyle?: StyleProp<ViewStyle>;
  maxlength?: number
  showWordLimit?: boolean //是否显示字数统计
  fieldStyle?: StyleProp<ViewStyle>;
}
type TextInputHandles = FieldRefType
const Field = React.forwardRef<TextInputHandles, Props>(({
  onRightIconClick,
  clearable,
  style,
  type,
  border = true,
  ...rest
}: Props, ref) => {
  /**
   * 传递ref节点添加方法
   */
  const root = React.useRef<TextInput>(null);
  React.useImperativeHandle(ref, () => {
    const input = root.current;
    if (input) {
      return {
        focus: () => input.focus(),
        clear: () => input.clear(),
        // setNativeProps: (args: TextInputProps) => input.setNativeProps(args),
        isFocused: () => input.isFocused(),
        blur: () => input.blur(),
      };
    }
    const noop = () => {
      throw new Error('TextInput is not available');
    };
    return {
      focus: noop,
      clear: noop,
      blur: noop,
      isFocused: noop
    };
  });
  const clearableHandel = () => {
    rest?.onInput && rest?.onInput("")
    root.current?.clear()
  }
  /**
   * [Props]type
   * 输入框形态
   * 软键盘形态
   */
  const keyboardType = (type === 'number' ? 'numeric' : 'default')

  return (
    <View style={StyleSheet.flatten([
      styles.container,
      { paddingBottom: rest.showWordLimit ? 20 : 8 },
      rest.disabled && styles.disabledInput,
      rest.disabled && rest.disabledInputStyle,
      rest.fieldStyle])}>
      {rest.label && (
        <View style={[{ paddingRight: 8 }, rest.labelStyle]}>
          <Text style={{ fontSize: rest.labelFontSize || 16 }}>{rest.label}：</Text>
        </View>)
      }
      <View style={
        StyleSheet.flatten([
          styles.inputMain,
          border && styles.border,
          rest.borderStyle && rest.borderStyle])
      }>
        <TextInput
          ref={root}
          style={StyleSheet.flatten([
            styles.input,
            type === 'textarea' && styles.textarea,
            style
          ])}
          underlineColorAndroid="transparent"
          editable={!rest.disabled}
          secureTextEntry={type === 'password'}
          keyboardType={keyboardType}
          onChangeText={rest.onInput}
          multiline={type === 'textarea'}
          {...rest}
        />
        {clearable && (
          <Text style={{ display: rest.value ? "flex" : "none" }} onPress={clearableHandel}>
            <Icon name={rest.clearIcon || "closecircle"} color={rest.clearIconColor || "#333"}></Icon>
          </Text>
        )}
        {rest.rightIcon && (
          <TouchableWithoutFeedback onPress={onRightIconClick}>
            <View>{renderNode(Icon, rest.rightIcon)}</View>
          </TouchableWithoutFeedback>)
        }
      </View>
      {
        (rest.showWordLimit && rest.maxlength) && <View style={styles.showWordLimit}>
          <Text>{rest.value?.length}/{rest.maxlength}</Text>
        </View>
      }

      {/* 自定义右边内容 */}
    </View>
  )
})

const styles = StyleSheet.create({
  container: {
    width: "100%",
    flexDirection: 'row',
    alignItems: 'center',
    padding: 8,
    backgroundColor: '#fff',
    position: "relative",
  },
  inputMain: {
    flexDirection: 'row',
    alignItems: 'center',
    flex: 1,
    paddingLeft: 8,
    paddingRight: 8,
  },
  border: {
    borderWidth: 1,
    borderColor: "#ccc",
    borderRadius: 6,
  },
  input: {
    flex: 1,
    fontSize: 16,
    minHeight: 40,
  },
  textarea: {
    minHeight: 80,
    textAlignVertical: 'top'
  },
  disabledInput: {
    opacity: 0.5,
  },
  showWordLimit: {
    position: "absolute",
    right: 12,
    bottom: 0
  }
});

export default Field