/*
Copyright 2015, 2016 OpenMarket Ltd
Copyright 2017 Vector Creations Ltd
Copyright 2018 New Vector 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 { fieldInputIncorrect } from '../../../UiEffects';
import sdk from '../../../index';
import Email from '../../../email';
import { looksValid as phoneNumberLooksValid } from '../../../phonenumber';
import Modal from '../../../Modal';
import { _t } from '../../../languageHandler';
import SdkConfig from '../../../SdkConfig';
import { SAFE_LOCALPART_REGEX } from '../../../Registration';

const FIELD_EMAIL = 'field_email';
const FIELD_PHONE_NUMBER = 'field_phone_number';
const FIELD_USERNAME = 'field_username';
const FIELD_PASSWORD = 'field_password';
const FIELD_PASSWORD_CONFIRM = 'field_password_confirm';

/**
 * A pure UI component which displays a registration form.
 */
module.exports = React.createClass({
    displayName: 'RegistrationForm',

    propTypes: {
        // Values pre-filled in the input boxes when the component loads
        defaultEmail: PropTypes.string,
        defaultPhoneCountry: PropTypes.string,
        defaultPhoneNumber: PropTypes.string,
        defaultUsername: PropTypes.string,
        defaultPassword: PropTypes.string,
        minPasswordLength: PropTypes.number,
        onError: PropTypes.func,
        onRegisterClick: PropTypes.func.isRequired, // onRegisterClick(Object) => ?Promise
        flows: PropTypes.arrayOf(PropTypes.object).isRequired,
    },

    getDefaultProps: function() {
        return {
            minPasswordLength: 6,
            onError: function(e) {
                console.error(e);
            },
        };
    },

    getInitialState: function() {
        return {
            fieldValid: {},
            // The ISO2 country code selected in the phone number entry
            phoneCountry: this.props.defaultPhoneCountry,
        };
    },

    onSubmit: function(ev) {
        ev.preventDefault();

        // validate everything, in reverse order so
        // the error that ends up being displayed
        // is the one from the first invalid field.
        // It's not super ideal that this just calls
        // onError once for each invalid field.
        this.validateField(FIELD_PASSWORD_CONFIRM);
        this.validateField(FIELD_PASSWORD);
        this.validateField(FIELD_USERNAME);
        this.validateField(FIELD_PHONE_NUMBER);
        this.validateField(FIELD_EMAIL);

        const self = this;
        if (this.allFieldsValid()) {
            if (this.refs.email.value == '') {
                const QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
                Modal.createTrackedDialog('If you don\'t specify an email address...', '', QuestionDialog, {
                    title: _t("Warning!"),
                    description:
                        <div>
                            { _t("If you don't specify an email address, you won't be able to reset your password. " +
                                "Are you sure?") }
                        </div>,
                    button: _t("Continue"),
                    onFinished: function(confirmed) {
                        if (confirmed) {
                            self._doSubmit(ev);
                        }
                    },
                });
            } else {
                self._doSubmit(ev);
            }
        }
    },

    _doSubmit: function(ev) {
        const email = this.refs.email.value.trim();
        const promise = this.props.onRegisterClick({
            username: this.refs.username.value.trim(),
            password: this.refs.password.value.trim(),
            email: email,
            phoneCountry: this.state.phoneCountry,
            phoneNumber: this.refs.phoneNumber ? this.refs.phoneNumber.value.trim() : '',
        });

        if (promise) {
            ev.target.disabled = true;
            promise.finally(function() {
                ev.target.disabled = false;
            });
        }
    },

    /**
     * @returns {boolean} true if all fields were valid last time they were validated.
     */
    allFieldsValid: function() {
        const keys = Object.keys(this.state.fieldValid);
        for (let i = 0; i < keys.length; ++i) {
            if (this.state.fieldValid[keys[i]] == false) {
                return false;
            }
        }
        return true;
    },

    validateField: function(fieldID) {
        const pwd1 = this.refs.password.value.trim();
        const pwd2 = this.refs.passwordConfirm.value.trim();

        switch (fieldID) {
            case FIELD_EMAIL: {
                const email = this.refs.email.value;
                const emailValid = email === '' || Email.looksValid(email);
                if (this._authStepIsRequired('m.login.email.identity') && (!emailValid || email === '')) {
                    this.markFieldValid(fieldID, false, "RegistrationForm.ERR_MISSING_EMAIL");
                } else this.markFieldValid(fieldID, emailValid, "RegistrationForm.ERR_EMAIL_INVALID");
                break;
            }
            case FIELD_PHONE_NUMBER: {
                const phoneNumber = this.refs.phoneNumber ? this.refs.phoneNumber.value : '';
                const phoneNumberValid = phoneNumber === '' || phoneNumberLooksValid(phoneNumber);
                if (this._authStepIsRequired('m.login.msisdn') && (!phoneNumberValid || phoneNumber === '')) {
                    this.markFieldValid(fieldID, false, "RegistrationForm.ERR_MISSING_PHONE_NUMBER");
                } else this.markFieldValid(fieldID, phoneNumberValid, "RegistrationForm.ERR_PHONE_NUMBER_INVALID");
                break;
            }
            case FIELD_USERNAME: {
                const username = this.refs.username.value.trim();
                if (!SAFE_LOCALPART_REGEX.test(username)) {
                    this.markFieldValid(
                        fieldID,
                        false,
                        "RegistrationForm.ERR_USERNAME_INVALID",
                    );
                } else if (username == '') {
                    this.markFieldValid(
                        fieldID,
                        false,
                        "RegistrationForm.ERR_USERNAME_BLANK",
                    );
                } else {
                    this.markFieldValid(fieldID, true);
                }
                break;
            }
            case FIELD_PASSWORD:
                if (pwd1 == '') {
                    this.markFieldValid(
                        fieldID,
                        false,
                        "RegistrationForm.ERR_PASSWORD_MISSING",
                    );
                } else if (pwd1.length < this.props.minPasswordLength) {
                    this.markFieldValid(
                        fieldID,
                        false,
                        "RegistrationForm.ERR_PASSWORD_LENGTH",
                    );
                } else {
                    this.markFieldValid(fieldID, true);
                }
                break;
            case FIELD_PASSWORD_CONFIRM:
                this.markFieldValid(
                    fieldID, pwd1 == pwd2,
                    "RegistrationForm.ERR_PASSWORD_MISMATCH",
                );
                break;
        }
    },

    markFieldValid: function(fieldID, val, errorCode) {
        const fieldValid = this.state.fieldValid;
        fieldValid[fieldID] = val;
        this.setState({fieldValid: fieldValid});
        if (!val) {
            fieldInputIncorrect(this.fieldElementById(fieldID));
            this.props.onError(errorCode);
        }
    },

    fieldElementById(fieldID) {
        switch (fieldID) {
            case FIELD_EMAIL:
                return this.refs.email;
            case FIELD_PHONE_NUMBER:
                return this.refs.phoneNumber;
            case FIELD_USERNAME:
                return this.refs.username;
            case FIELD_PASSWORD:
                return this.refs.password;
            case FIELD_PASSWORD_CONFIRM:
                return this.refs.passwordConfirm;
        }
    },

    _classForField: function(fieldID, ...baseClasses) {
        let cls = baseClasses.join(' ');
        if (this.state.fieldValid[fieldID] === false) {
            if (cls) cls += ' ';
            cls += 'error';
        }
        return cls;
    },

    _onPhoneCountryChange(newVal) {
        this.setState({
            phoneCountry: newVal.iso2,
            phonePrefix: newVal.prefix,
        });
    },

    _authStepIsRequired(step) {
        // A step is required if no flow exists which does not include that step
        // (Notwithstanding setups like either email or msisdn being required)
        return !this.props.flows.some((flow) => {
            return !flow.stages.includes(step);
        });
    },

    render: function() {
        const self = this;

        const emailPlaceholder = this._authStepIsRequired('m.login.email.identity') ?
            _t("Email address") :
            _t("Email address (optional)");

        const emailSection = (
            <div>
                <input type="text" ref="email"
                    autoFocus={true} placeholder={emailPlaceholder}
                    defaultValue={this.props.defaultEmail}
                    className={this._classForField(FIELD_EMAIL, 'mx_Login_field')}
                    onBlur={function() {self.validateField(FIELD_EMAIL);}}
                    value={self.state.email} />
            </div>
        );

        const CountryDropdown = sdk.getComponent('views.auth.CountryDropdown');
        let phoneSection;
        if (!SdkConfig.get().disable_3pid_login) {
            const phonePlaceholder = this._authStepIsRequired('m.login.msisdn') ?
                _t("Mobile phone number") :
                _t("Mobile phone number (optional)");
            phoneSection = (
                <div className="mx_Login_phoneSection">
                    <CountryDropdown ref="phone_country" onOptionChange={this._onPhoneCountryChange}
                        className="mx_Login_phoneCountry mx_Login_field_prefix"
                        value={this.state.phoneCountry}
                        isSmall={true}
                        showPrefix={true}
                    />
                    <input type="text" ref="phoneNumber"
                        placeholder={phonePlaceholder}
                        defaultValue={this.props.defaultPhoneNumber}
                        className={this._classForField(
                            FIELD_PHONE_NUMBER,
                            'mx_Login_phoneNumberField',
                            'mx_Login_field',
                            'mx_Login_field_has_prefix',
                        )}
                        onBlur={function() {self.validateField(FIELD_PHONE_NUMBER);}}
                        value={self.state.phoneNumber}
                    />
                </div>
            );
        }

        const registerButton = (
            <input className="mx_Login_submit" type="submit" value={_t("Register")} />
        );

        const placeholderUsername = _t("Username");

        return (
            <div>
                <form onSubmit={this.onSubmit}>
                    { emailSection }
                    { phoneSection }
                    <input type="text" ref="username"
                        placeholder={placeholderUsername} defaultValue={this.props.defaultUsername}
                        className={this._classForField(FIELD_USERNAME, 'mx_Login_field')}
                        onBlur={function() {self.validateField(FIELD_USERNAME);}} />
                    <br />
                    <input type="password" ref="password"
                        className={this._classForField(FIELD_PASSWORD, 'mx_Login_field')}
                        onBlur={function() {self.validateField(FIELD_PASSWORD);}}
                        placeholder={_t("Password")} defaultValue={this.props.defaultPassword} />
                    <br />
                    <input type="password" ref="passwordConfirm"
                        placeholder={_t("Confirm password")}
                        className={this._classForField(FIELD_PASSWORD_CONFIRM, 'mx_Login_field')}
                        onBlur={function() {self.validateField(FIELD_PASSWORD_CONFIRM);}}
                        defaultValue={this.props.defaultPassword} />
                    <br />
                    { registerButton }
                </form>
            </div>
        );
    },
});