import {BarCodeScanner} from 'expo-barcode-scanner';
import React, {ReactElement, useState} from 'react';
import {Text, View} from 'react-native';
import {Button, DefaultTheme, HelperText, Subheading, TextInput, Title} from 'react-native-paper';
import {ButtonProps, ScannerProps} from '../models/ElementProps';
import {colors, styles} from './Styles';


export const Scanner = (props: ScannerProps): ReactElement => {
  return <View style={styles.container}>
    <View style={styles.container}>
      <BarCodeScanner
        type={props.cameraType}
        onBarCodeScanned={props.onScanned}
        style={styles.fullScreen}
      />
    </View>
    <View style={styles.centerMiddle}>
      <View style={styles.captureBox}/>
    </View>
    <Subheading style={styles.shadow}>
      Instruct the patient to hold their card up with the barcode facing the camera. Keep the barcode in the orange box.
    </Subheading>
    <View style={styles.centerMiddle}>
      <Button
        mode="text"
        color={colors.primary}
        icon="cancel"
        onPress={props.onCancel}
        style={styles.btnWhite}
      >Cancel</Button>
    </View>
  </View>;
};

export const ScanButton = (props: ButtonProps): ReactElement => {
  return <Button
    icon="camera"
    mode="contained"
    color={colors.accent}
    onPress={props.onClicked}
    style={styles.btnLg}
    labelStyle={styles.btnLg}
  >Scan Barcode</Button>;
};

export const InputIdButton = (props: ButtonProps): ReactElement => {
  return <Button
    icon="keyboard"
    mode="text"
    color={colors.onBackground}
    onPress={props.onClicked}
    style={{marginTop: 30}}
  >Enter ID Number Manually</Button>;
};

export const IdNumberInput = (props: ScannerProps): ReactElement => {
  const [inputStr, setInputStr] = useState<string>('');
  const pattern = /^[\d]{9}$/;
  const hasErrors = () => {
    return !pattern.test(inputStr);
  };

  const onSubmit = () => {
    props.onScanned({type: '', data: inputStr});
  }

  return <View style={styles.settings}>
    <Title style={styles.headingInverse}>Manual ID # Entry</Title>
    <View style={{marginBottom: 10}}>
      <Subheading style={{color: DefaultTheme.colors.text, marginBottom: 60}}>
        Please double check that you have entered the number correctly. Entering an incorrect ID number will prevent
        patients from receiving their test results.
      </Subheading>
      <TextInput
        label="ID #"
        value={inputStr}
        onChangeText={inputStr => setInputStr(inputStr)}
        mode="outlined"
        theme={DefaultTheme}
        keyboardType="numeric"
      />
      <HelperText type="error" visible={hasErrors()}>
        ID number must be exactly 9 digits. No other characters are allowed.
      </HelperText>
      <Button
        icon="check"
        mode="contained"
        color={colors.primary}
        style={{marginBottom: 10}}
        disabled={hasErrors()}
        onPress={onSubmit}
      >Submit</Button>
      <Button
        icon="cancel"
        mode="outlined"
        color={colors.primary}
        onPress={props.onCancel}
      >Cancel</Button>
    </View>
  </View>;
};