import React from 'react';
import PropTypes from 'prop-types';
import {
	Text, View, StyleSheet, Keyboard, Alert
} from 'react-native';
import { connect } from 'react-redux';
import { dequal } from 'dequal';

import sharedStyles from './Styles';
import Button from '../containers/Button';
import I18n from '../i18n';
import * as HeaderButton from '../containers/HeaderButton';
import { themes } from '../constants/colors';
import { withTheme } from '../theme';
import FormContainer, { FormContainerInner } from '../containers/FormContainer';
import TextInput from '../containers/TextInput';
import { loginRequest as loginRequestAction } from '../actions/login';
import LoginServices from '../containers/LoginServices';

const styles = StyleSheet.create({
	registerDisabled: {
		...sharedStyles.textRegular,
		...sharedStyles.textAlignCenter,
		fontSize: 16
	},
	title: {
		...sharedStyles.textBold,
		fontSize: 22
	},
	inputContainer: {
		marginVertical: 16
	},
	bottomContainer: {
		flexDirection: 'column',
		alignItems: 'center',
		marginBottom: 32
	},
	bottomContainerText: {
		...sharedStyles.textRegular,
		fontSize: 13
	},
	bottomContainerTextBold: {
		...sharedStyles.textSemibold,
		fontSize: 13
	},
	loginButton: {
		marginTop: 16
	}
});

class LoginView extends React.Component {
	static navigationOptions = ({ route, navigation }) => ({
		title: route.params?.title ?? 'Rocket.Chat',
		headerRight: () => <HeaderButton.Legal testID='login-view-more' navigation={navigation} />
	})

	static propTypes = {
		navigation: PropTypes.object,
		route: PropTypes.object,
		Site_Name: PropTypes.string,
		Accounts_RegistrationForm: PropTypes.string,
		Accounts_RegistrationForm_LinkReplacementText: PropTypes.string,
		Accounts_EmailOrUsernamePlaceholder: PropTypes.string,
		Accounts_PasswordPlaceholder: PropTypes.string,
		Accounts_PasswordReset: PropTypes.bool,
		Accounts_ShowFormLogin: PropTypes.bool,
		isFetching: PropTypes.bool,
		error: PropTypes.object,
		failure: PropTypes.bool,
		theme: PropTypes.string,
		loginRequest: PropTypes.func,
		inviteLinkToken: PropTypes.string
	}

	constructor(props) {
		super(props);
		this.state = {
			user: props.route.params?.username ?? '',
			password: ''
		};
	}

	UNSAFE_componentWillReceiveProps(nextProps) {
		const { error } = this.props;
		if (nextProps.failure && !dequal(error, nextProps.error)) {
			Alert.alert(I18n.t('Oops'), I18n.t('Login_error'));
		}
	}

	get showRegistrationButton() {
		const { Accounts_RegistrationForm, inviteLinkToken } = this.props;
		return Accounts_RegistrationForm === 'Public' || (Accounts_RegistrationForm === 'Secret URL' && inviteLinkToken?.length);
	}

	login = () => {
		const { navigation, Site_Name } = this.props;
		navigation.navigate('LoginView', { title: Site_Name });
	}

	register = () => {
		const { navigation, Site_Name } = this.props;
		navigation.navigate('RegisterView', { title: Site_Name });
	}

	forgotPassword = () => {
		const { navigation, Site_Name } = this.props;
		navigation.navigate('ForgotPasswordView', { title: Site_Name });
	}

	valid = () => {
		const { user, password } = this.state;
		return user.trim() && password.trim();
	}

	submit = () => {
		if (!this.valid()) {
			return;
		}

		const { user, password } = this.state;
		const { loginRequest } = this.props;
		Keyboard.dismiss();
		loginRequest({ user, password });
	}

	renderUserForm = () => {
		const { user } = this.state;
		const {
			Accounts_EmailOrUsernamePlaceholder, Accounts_PasswordPlaceholder, Accounts_PasswordReset, Accounts_RegistrationForm_LinkReplacementText, isFetching, theme, Accounts_ShowFormLogin
		} = this.props;

		if (!Accounts_ShowFormLogin) {
			return null;
		}

		return (
			<>
				<Text style={[styles.title, sharedStyles.textBold, { color: themes[theme].titleText }]}>{I18n.t('Login')}</Text>
				<TextInput
					label={I18n.t('Username_or_email')}
					containerStyle={styles.inputContainer}
					placeholder={Accounts_EmailOrUsernamePlaceholder || I18n.t('Username_or_email')}
					keyboardType='email-address'
					returnKeyType='next'
					onChangeText={value => this.setState({ user: value })}
					onSubmitEditing={() => { this.passwordInput.focus(); }}
					testID='login-view-email'
					textContentType='username'
					autoCompleteType='username'
					theme={theme}
					value={user}
				/>
				<TextInput
					label={I18n.t('Password')}
					containerStyle={styles.inputContainer}
					inputRef={(e) => { this.passwordInput = e; }}
					placeholder={Accounts_PasswordPlaceholder || I18n.t('Password')}
					returnKeyType='send'
					secureTextEntry
					onSubmitEditing={this.submit}
					onChangeText={value => this.setState({ password: value })}
					testID='login-view-password'
					textContentType='password'
					autoCompleteType='password'
					theme={theme}
				/>
				<Button
					title={I18n.t('Login')}
					type='primary'
					onPress={this.submit}
					testID='login-view-submit'
					loading={isFetching}
					disabled={!this.valid()}
					theme={theme}
					style={styles.loginButton}
				/>
				{Accounts_PasswordReset && (
					<Button
						title={I18n.t('Forgot_password')}
						type='secondary'
						onPress={this.forgotPassword}
						testID='login-view-forgot-password'
						theme={theme}
						color={themes[theme].auxiliaryText}
						fontSize={14}
					/>
				)}
				{this.showRegistrationButton ? (
					<View style={styles.bottomContainer}>
						<Text style={[styles.bottomContainerText, { color: themes[theme].auxiliaryText }]}>{I18n.t('Dont_Have_An_Account')}</Text>
						<Text
							style={[styles.bottomContainerTextBold, { color: themes[theme].actionTintColor }]}
							onPress={this.register}
							testID='login-view-register'
						>{I18n.t('Create_account')}
						</Text>
					</View>
				) : (<Text style={[styles.registerDisabled, { color: themes[theme].auxiliaryText }]}>{Accounts_RegistrationForm_LinkReplacementText}</Text>)}
			</>
		);
	}

	render() {
		const { Accounts_ShowFormLogin, theme, navigation } = this.props;
		return (
			<FormContainer theme={theme} testID='login-view'>
				<FormContainerInner>
					<LoginServices separator={Accounts_ShowFormLogin} navigation={navigation} />
					{this.renderUserForm()}
				</FormContainerInner>
			</FormContainer>
		);
	}
}

const mapStateToProps = state => ({
	server: state.server.server,
	Site_Name: state.settings.Site_Name,
	Accounts_ShowFormLogin: state.settings.Accounts_ShowFormLogin,
	Accounts_RegistrationForm: state.settings.Accounts_RegistrationForm,
	Accounts_RegistrationForm_LinkReplacementText: state.settings.Accounts_RegistrationForm_LinkReplacementText,
	isFetching: state.login.isFetching,
	failure: state.login.failure,
	error: state.login.error && state.login.error.data,
	Accounts_EmailOrUsernamePlaceholder: state.settings.Accounts_EmailOrUsernamePlaceholder,
	Accounts_PasswordPlaceholder: state.settings.Accounts_PasswordPlaceholder,
	Accounts_PasswordReset: state.settings.Accounts_PasswordReset,
	inviteLinkToken: state.inviteLinks.token
});

const mapDispatchToProps = dispatch => ({
	loginRequest: params => dispatch(loginRequestAction(params))
});

export default connect(mapStateToProps, mapDispatchToProps)(withTheme(LoginView));