import React, { useState, useContext } from 'react';
import { View } from 'react-native';
import PropTypes from 'prop-types';
import { NavigationContainer } from '@react-navigation/native';
import { AppearanceProvider } from 'react-native-appearance';
import { createStackNavigator } from '@react-navigation/stack';
import { Provider } from 'react-redux';
import RNUserDefaults from 'rn-user-defaults';

import {
	defaultTheme,
	newThemeState,
	subscribeTheme,
	unsubscribeTheme
} from './utils/theme';
import Navigation from './lib/ShareNavigation';
import store from './lib/createStore';
import { isIOS, supportSystemTheme } from './utils/deviceInfo';
import { defaultHeader, onNavigationStateChange, themedHeader } from './utils/navigation';
import RocketChat, { THEME_PREFERENCES_KEY } from './lib/rocketchat';
import { ThemeContext } from './theme';

// Outside Stack
import WithoutServersView from './views/WithoutServersView';

// Inside Stack
import ShareListView from './views/ShareListView';
import ShareView from './views/ShareView';
import SelectServerView from './views/SelectServerView';

const Inside = createStackNavigator();
const InsideStack = () => {
	const { theme } = useContext(ThemeContext);

	const screenOptions = {
		...defaultHeader,
		...themedHeader(theme)
	};
	screenOptions.headerStyle = {
		...screenOptions.headerStyle,
		// TODO: fix on multiple files PR :)
		height: 57
	};

	return (
		<Inside.Navigator screenOptions={screenOptions}>
			<Inside.Screen
				name='ShareListView'
				component={ShareListView}
			/>
			<Inside.Screen
				name='ShareView'
				component={ShareView}
			/>
			<Inside.Screen
				name='SelectServerView'
				component={SelectServerView}
				options={SelectServerView.navigationOptions}
			/>
		</Inside.Navigator>
	);
};

const Outside = createStackNavigator();
const OutsideStack = () => {
	const { theme } = useContext(ThemeContext);

	return (
		<Outside.Navigator screenOptions={{ ...defaultHeader, ...themedHeader(theme) }}>
			<Outside.Screen
				name='WithoutServersView'
				component={WithoutServersView}
				options={WithoutServersView.navigationOptions}
			/>
		</Outside.Navigator>
	);
};

// App
const Stack = createStackNavigator();
export const App = ({ root }) => {
	if (!root) {
		return null;
	}

	return (
		<Stack.Navigator screenOptions={{ headerShown: false }}>
			<>
				{root === 'outside' ? (
					<Stack.Screen
						name='OutsideStack'
						component={OutsideStack}
					/>
				) : null}
				{root === 'inside' ? (
					<Stack.Screen
						name='InsideStack'
						component={InsideStack}
					/>
				) : null}
			</>
		</Stack.Navigator>
	);
};

App.propTypes = {
	root: PropTypes.string
};

class Root extends React.Component {
	constructor(props) {
		super(props);
		this.state = {
			theme: defaultTheme(),
			themePreferences: {
				currentTheme: supportSystemTheme() ? 'automatic' : 'light',
				darkLevel: 'dark'
			},
			root: ''
		};
		this.init();
	}

	componentWillUnmount() {
		RocketChat.closeShareExtension();
		unsubscribeTheme();
	}

	init = async() => {
		if (isIOS) {
			await RNUserDefaults.setName('group.ios.chat.rocket');
		}
		RNUserDefaults.objectForKey(THEME_PREFERENCES_KEY).then(this.setTheme);
		const currentServer = await RNUserDefaults.get('currentServer');
		const token = await RNUserDefaults.get(RocketChat.TOKEN_KEY);

		if (currentServer && token) {
			this.setState({ root: 'inside' });
			await RocketChat.shareExtensionInit(currentServer);
		} else {
			this.setState({ root: 'outside' });
		}
	}

	setTheme = (newTheme = {}) => {
		// change theme state
		this.setState(prevState => newThemeState(prevState, newTheme), () => {
			const { themePreferences } = this.state;
			// subscribe to Appearance changes
			subscribeTheme(themePreferences, this.setTheme);
		});
	}

	render() {
		const { theme, root } = this.state;
		return (
			<AppearanceProvider>
				<Provider store={store}>
					<ThemeContext.Provider value={{ theme }}>
						<NavigationContainer
							ref={Navigation.navigationRef}
							onNavigationStateChange={onNavigationStateChange}
						>
							<App root={root} />
						</NavigationContainer>
					</ThemeContext.Provider>
				</Provider>
			</AppearanceProvider>
		);
	}
}

export default Root;