import * as React from 'react';
import { Button, View, Text } from 'react-native';
import {
  createStackNavigator,
  NavigationStackScreenComponent,
} from 'react-navigation-stack';

const ListScreen: NavigationStackScreenComponent = function(props) {
  return (
    <View
      style={{
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
        backgroundColor: 'white',
      }}
    >
      <Text>List Screen</Text>
      <Text>A list may go here</Text>
      <Button
        title="Open Dialog"
        onPress={() => props.navigation.navigate('ModalDialog')}
      />
      <Button
        title="Go back to all examples"
        onPress={() => props.navigation.navigate('Index')}
      />
    </View>
  );
};

const ModalDialogScreen: NavigationStackScreenComponent = function(props) {
  return (
    <View
      style={{
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
        backgroundColor: 'rgba(0, 0, 0, 0.3)',
      }}
    >
      <View
        style={{
          backgroundColor: 'white',
          padding: 16,
          width: '90%',
          maxWidth: 500,
          minHeight: 300,
          borderRadius: 6,
          elevation: 6,
          shadowColor: 'black',
          shadowOpacity: 0.15,
          shadowOffset: { width: 0, height: 2 },
          shadowRadius: 10,
        }}
      >
        <Text style={{ flex: 1, fontSize: 16 }}>Dialog</Text>
        <Button title="Close" onPress={() => props.navigation.goBack()} />
      </View>
    </View>
  );
};

export default createStackNavigator(
  {
    List: ListScreen,
    ModalDialog: ModalDialogScreen,
  },
  {
    initialRouteName: 'List',
    mode: 'modal',
    headerMode: 'none',
    defaultNavigationOptions: {
      cardStyle: { backgroundColor: 'transparent' },
      gestureEnabled: false,
      cardStyleInterpolator: ({ current: { progress } }) => {
        const opacity = progress.interpolate({
          inputRange: [0, 0.5, 0.9, 1],
          outputRange: [0, 0.25, 0.7, 1],
        });

        return {
          cardStyle: {
            opacity,
          },
        };
      },
    },
  }
);
