# All files / header Header.js

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     import React from 'react';
    import PropTypes from 'prop-types';
    import { StatusBar, StyleSheet, View } from 'react-native';
    import isEmpty from 'lodash.isempty';
    import DummyNavButton from './DummyNavButton';
    import NavButton from './NavButton';
    import Title from './Title';
    import ViewPropTypes from '../config/ViewPropTypes';

    function generateChild(value, type) {
      if (React.isValidElement(value)) {
        return (
          <View key={type}>
            {value}
          </View>
        );
      } else if (typeof value === 'object' && !isEmpty(value)) {
        return type === 'center'
          ? <Title {...value} key={type} />
          : <NavButton {...value} key={type} />;
      }
      return type === 'center' ? null : <DummyNavButton key={type} />;
    }

    function populateChildren(propChildren) {
      const childrenArray = [];

      const leftComponent = generateChild(propChildren.leftComponent, 'left');
      const centerComponent = generateChild(propChildren.centerComponent, 'center');
      const rightComponent = generateChild(propChildren.rightComponent, 'right');

      childrenArray.push(leftComponent, centerComponent, rightComponent);

      return childrenArray;
    }

    const Header = props => {
      const {
        children,
        statusBarProps,
        leftComponent,
        centerComponent,
        rightComponent,
        backgroundColor,
        outerContainerStyles,
        innerContainerStyles,
        ...attributes
      } = props;

      let propChildren = [];

      if (leftComponent || centerComponent || rightComponent) {
        propChildren = populateChildren({
          leftComponent,
          centerComponent,
          rightComponent,
        });
      }

      return (
        <View
          style={[styles.outerContainer, { backgroundColor }, outerContainerStyles]}
          {...attributes}
        >
          <StatusBar {...statusBarProps} />
          <View style={[styles.innerContainer, innerContainerStyles]}>
            {propChildren.length > 0 ? propChildren : children}
          </View>
        </View>
      );
    };

    Header.propTypes = {
      leftComponent: PropTypes.object,
      centerComponent: PropTypes.object,
      rightComponent: PropTypes.object,
      backgroundColor: PropTypes.string,
      outerContainerStyles: ViewPropTypes.style,
      innerContainerStyles: ViewPropTypes.style,
      children: PropTypes.element,
      statusBarProps: PropTypes.object,
    };

    const styles = StyleSheet.create({
      innerContainer: {
        flex: 1,
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'flex-end',
      },
      outerContainer: {
        position: 'absolute',
        top: 0,
        left: 0,
        right: 0,
        backgroundColor: '#fff',
        borderBottomColor: '#f2f2f2',
        borderBottomWidth: 1,
        padding: 15,
        height: 70,
      },
    });

    export default Header;