/*
Copyright 2015, 2016 OpenMarket Ltd
Copyright 2017 Vector Creations Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import sdk from '../../../index';
import { _t } from '../../../languageHandler';
import SdkConfig from '../../../SdkConfig';

/**
 * A pure UI component which displays a username/password form.
 */
class PasswordLogin extends React.Component {
    static defaultProps = {
        onError: function() {},
        onEditServerDetailsClick: null,
        onUsernameChanged: function() {},
        onUsernameBlur: function() {},
        onPasswordChanged: function() {},
        onPhoneCountryChanged: function() {},
        onPhoneNumberChanged: function() {},
        onPhoneNumberBlur: function() {},
        initialUsername: "",
        initialPhoneCountry: "",
        initialPhoneNumber: "",
        initialPassword: "",
        loginIncorrect: false,
        // This is optional and only set if we used a server name to determine
        // the HS URL via `.well-known` discovery. The server name is used
        // instead of the HS URL when talking about where to "sign in to".
        hsName: null,
        hsUrl: "",
        disableSubmit: false,
    }

    constructor(props) {
        super(props);
        this.state = {
            username: this.props.initialUsername,
            password: this.props.initialPassword,
            phoneCountry: this.props.initialPhoneCountry,
            phoneNumber: this.props.initialPhoneNumber,
            loginType: PasswordLogin.LOGIN_FIELD_MXID,
        };

        this.onSubmitForm = this.onSubmitForm.bind(this);
        this.onUsernameChanged = this.onUsernameChanged.bind(this);
        this.onUsernameBlur = this.onUsernameBlur.bind(this);
        this.onLoginTypeChange = this.onLoginTypeChange.bind(this);
        this.onPhoneCountryChanged = this.onPhoneCountryChanged.bind(this);
        this.onPhoneNumberChanged = this.onPhoneNumberChanged.bind(this);
        this.onPhoneNumberBlur = this.onPhoneNumberBlur.bind(this);
        this.onPasswordChanged = this.onPasswordChanged.bind(this);
        this.isLoginEmpty = this.isLoginEmpty.bind(this);
    }

    componentWillMount() {
        this._passwordField = null;
        this._loginField = null;
    }

    onSubmitForm(ev) {
        ev.preventDefault();

        let username = ''; // XXX: Synapse breaks if you send null here:
        let phoneCountry = null;
        let phoneNumber = null;
        let error;

        switch (this.state.loginType) {
            case PasswordLogin.LOGIN_FIELD_EMAIL:
                username = this.state.username;
                if (!username) {
                    error = _t('The email field must not be blank.');
                }
                break;
            case PasswordLogin.LOGIN_FIELD_MXID:
                username = this.state.username;
                if (!username) {
                    error = _t('The username field must not be blank.');
                }
                break;
            case PasswordLogin.LOGIN_FIELD_PHONE:
                phoneCountry = this.state.phoneCountry;
                phoneNumber = this.state.phoneNumber;
                if (!phoneNumber) {
                    error = _t('The phone number field must not be blank.');
                }
                break;
        }

        if (error) {
            this.props.onError(error);
            return;
        }

        if (!this.state.password) {
            this.props.onError(_t('The password field must not be blank.'));
            return;
        }

        this.props.onSubmit(
            username,
            phoneCountry,
            phoneNumber,
            this.state.password,
        );
    }

    onUsernameChanged(ev) {
        this.setState({username: ev.target.value});
        this.props.onUsernameChanged(ev.target.value);
    }

    onUsernameBlur(ev) {
        this.props.onUsernameBlur(ev.target.value);
    }

    onLoginTypeChange(loginType) {
        this.props.onError(null); // send a null error to clear any error messages
        this.setState({
            loginType: loginType,
            username: "", // Reset because email and username use the same state
        });
    }

    onPhoneCountryChanged(country) {
        this.setState({
            phoneCountry: country.iso2,
            phonePrefix: country.prefix,
        });
        this.props.onPhoneCountryChanged(country.iso2);
    }

    onPhoneNumberChanged(ev) {
        this.setState({phoneNumber: ev.target.value});
        this.props.onPhoneNumberChanged(ev.target.value);
    }

    onPhoneNumberBlur(ev) {
        this.props.onPhoneNumberBlur(ev.target.value);
    }

    onPasswordChanged(ev) {
        this.setState({password: ev.target.value});
        this.props.onPasswordChanged(ev.target.value);
    }

    renderLoginField(loginType) {
        const classes = {
            mx_Login_field: true,
        };

        switch (loginType) {
            case PasswordLogin.LOGIN_FIELD_EMAIL:
                classes.error = this.props.loginIncorrect && !this.state.username;
                return <input
                    className="mx_Login_field"
                    ref={(e) => {this._loginField = e;}}
                    key="email_input"
                    type="text"
                    name="username" // make it a little easier for browser's remember-password
                    onChange={this.onUsernameChanged}
                    onBlur={this.onUsernameBlur}
                    placeholder="joe@example.com"
                    value={this.state.username}
                    autoFocus
                />;
            case PasswordLogin.LOGIN_FIELD_MXID:
                classes.error = this.props.loginIncorrect && !this.state.username;
                return <input
                    className={classNames(classes)}
                    ref={(e) => {this._loginField = e;}}
                    key="username_input"
                    type="text"
                    name="username" // make it a little easier for browser's remember-password
                    onChange={this.onUsernameChanged}
                    onBlur={this.onUsernameBlur}
                    placeholder={SdkConfig.get().disable_custom_urls ?
                                      _t("Username on %(hs)s", {
                                        hs: this.props.hsUrl.replace(/^https?:\/\//, ''),
                                      }) : _t("Username")}
                    value={this.state.username}
                    autoFocus
                />;
            case PasswordLogin.LOGIN_FIELD_PHONE: {
                const CountryDropdown = sdk.getComponent('views.auth.CountryDropdown');
                classes.mx_Login_field_has_prefix = true;
                classes.error = this.props.loginIncorrect && !this.state.phoneNumber;
                return <div className="mx_Login_phoneSection">
                    <CountryDropdown
                        className="mx_Login_phoneCountry mx_Login_field_prefix"
                        onOptionChange={this.onPhoneCountryChanged}
                        value={this.state.phoneCountry}
                        isSmall={true}
                        showPrefix={true}
                    />
                    <input
                        className={classNames(classes)}
                        ref={(e) => {this._loginField = e;}}
                        key="phone_input"
                        type="text"
                        name="phoneNumber"
                        onChange={this.onPhoneNumberChanged}
                        onBlur={this.onPhoneNumberBlur}
                        placeholder={_t("Mobile phone number")}
                        value={this.state.phoneNumber}
                        autoFocus
                    />
                </div>;
            }
        }
    }

    isLoginEmpty() {
        switch (this.state.loginType) {
            case PasswordLogin.LOGIN_FIELD_EMAIL:
            case PasswordLogin.LOGIN_FIELD_MXID:
                return !this.state.username;
            case PasswordLogin.LOGIN_FIELD_PHONE:
                return !this.state.phoneCountry || !this.state.phoneNumber;
        }
    }

    render() {
        let forgotPasswordJsx;

        if (this.props.onForgotPasswordClick) {
            forgotPasswordJsx = <span>
                {_t('Not sure of your password? <a>Set a new one</a>', {}, {
                    a: sub => <a className="mx_Login_forgot"
                        onClick={this.props.onForgotPasswordClick}
                        href="#"
                    >
                        {sub}
                    </a>,
                })}
            </span>;
        }

        let signInToText = _t('Sign in to your Matrix account');
        if (this.props.hsName) {
            signInToText = _t('Sign in to your Matrix account on %(serverName)s', {
                serverName: this.props.hsName,
            });
        } else {
            try {
                const parsedHsUrl = new URL(this.props.hsUrl);
                signInToText = _t('Sign in to your Matrix account on %(serverName)s', {
                    serverName: parsedHsUrl.hostname,
                });
            } catch (e) {
                // ignore
            }
        }

        let editLink = null;
        if (this.props.onEditServerDetailsClick) {
            editLink = <a className="mx_AuthBody_editServerDetails"
                href="#" onClick={this.props.onEditServerDetailsClick}
            >
                {_t('Change')}
            </a>;
        }

        const pwFieldClass = classNames({
            mx_Login_field: true,
            error: this.props.loginIncorrect && !this.isLoginEmpty(), // only error password if error isn't top field
        });

        const Dropdown = sdk.getComponent('elements.Dropdown');

        const loginField = this.renderLoginField(this.state.loginType);

        let loginType;
        if (!SdkConfig.get().disable_3pid_login) {
            loginType = (
                <div className="mx_Login_type_container">
                    <label className="mx_Login_type_label">{ _t('Sign in with') }</label>
                    <Dropdown
                        className="mx_Login_type_dropdown"
                        value={this.state.loginType}
                        onOptionChange={this.onLoginTypeChange}>
                            <span key={PasswordLogin.LOGIN_FIELD_MXID}>{ _t('Username') }</span>
                            <span key={PasswordLogin.LOGIN_FIELD_EMAIL}>{ _t('Email address') }</span>
                            <span key={PasswordLogin.LOGIN_FIELD_PHONE}>{ _t('Phone') }</span>
                    </Dropdown>
                </div>
            );
        }

        return (
            <div>
                <h3>
                    {signInToText}
                    {editLink}
                </h3>
                <form onSubmit={this.onSubmitForm}>
                    { loginType }
                    { loginField }
                    <input className={pwFieldClass} ref={(e) => {this._passwordField = e;}} type="password"
                        name="password"
                        value={this.state.password} onChange={this.onPasswordChanged}
                        placeholder={_t('Password')}
                    />
                    <br />
                    { forgotPasswordJsx }
                    <input className="mx_Login_submit"
                        type="submit"
                        value={_t('Sign in')}
                        disabled={this.props.disableSubmit}
                    />
                </form>
            </div>
        );
    }
}

PasswordLogin.LOGIN_FIELD_EMAIL = "login_field_email";
PasswordLogin.LOGIN_FIELD_MXID = "login_field_mxid";
PasswordLogin.LOGIN_FIELD_PHONE = "login_field_phone";

PasswordLogin.propTypes = {
    onSubmit: PropTypes.func.isRequired, // fn(username, password)
    onError: PropTypes.func,
    onForgotPasswordClick: PropTypes.func, // fn()
    initialUsername: PropTypes.string,
    initialPhoneCountry: PropTypes.string,
    initialPhoneNumber: PropTypes.string,
    initialPassword: PropTypes.string,
    onUsernameChanged: PropTypes.func,
    onPhoneCountryChanged: PropTypes.func,
    onPhoneNumberChanged: PropTypes.func,
    onPasswordChanged: PropTypes.func,
    loginIncorrect: PropTypes.bool,
    hsName: PropTypes.string,
    hsUrl: PropTypes.string,
    disableSubmit: PropTypes.bool,
};

module.exports = PasswordLogin;