'use strict';

import React, {Component} from 'react';
import PropTypes from 'prop-types';
import {
    Trans,
    translate
} from 'react-i18next';
import {
    NavButton,
    requiresAuthenticatedUser,
    Title,
    withPageHelpers
} from '../lib/page'
import {
    Button,
    ButtonRow,
    CheckBox,
    Fieldset,
    Form,
    FormSendMethod,
    InputField,
    TextArea,
    withForm
} from '../lib/form';
import {withErrorHandling} from '../lib/error-handling';
import {
    NamespaceSelect,
    validateNamespace
} from '../lib/namespace';
import {DeleteModalDialog} from "../lib/modals";

import {getMailerTypes} from "./helpers";

import {
    getSystemSendConfigurationId,
    MailerType
} from "../../../shared/send-configurations";

import mailtrainConfig from 'mailtrainConfig';


@translate()
@withForm
@withPageHelpers
@withErrorHandling
@requiresAuthenticatedUser
export default class CUD extends Component {
    constructor(props) {
        super(props);

        this.mailerTypes = getMailerTypes(props.t);

        this.state = {};

        this.initForm({
            onChangeBeforeValidation: {
                mailer_type: ::this.onMailerTypeChanged
            }
        });
    }

    static propTypes = {
        action: PropTypes.string.isRequired,
        wizard: PropTypes.string,
        entity: PropTypes.object
    }

    onMailerTypeChanged(mutState, key, oldType, type) {
        if (type) {
            this.mailerTypes[type].afterTypeChange(mutState);
        }
    }


    componentDidMount() {
        if (this.props.entity) {
            this.getFormValuesFromEntity(this.props.entity, data => {
                this.mailerTypes[data.mailer_type].afterLoad(data);
                data.verpEnabled = !!data.verp_hostname;
            });

        } else {
            this.populateFormValues({
                name: '',
                description: '',
                namespace: mailtrainConfig.user.namespace,
                from_email_overridable: false,
                from_name_overridable: false,
                reply_to_overridable: false,
                subject_overridable: false,
                verpEnabled: false,
                verp_hostname: '',
                x_mailer: '',
                mailer_type: MailerType.ZONE_MTA,
                ...this.mailerTypes[MailerType.ZONE_MTA].initData()
            });
        }
    }

    localValidateFormValues(state) {
        const t = this.props.t;

        const typeKey = state.getIn(['mailer_type', 'value']);

        if (!state.getIn(['name', 'value'])) {
            state.setIn(['name', 'error'], t('Name must not be empty'));
        } else {
            state.setIn(['name', 'error'], null);
        }

        if (!typeKey) {
            state.setIn(['mailer_type', 'error'], t('Mailer type must be selected'));
        } else {
            state.setIn(['mailer_type', 'error'], null);
        }

        if (state.getIn(['verpEnabled', 'value']) && !state.getIn(['verp_hostname', 'value'])) {
            state.setIn(['verp_hostname', 'error'], t('VERP hostname must not be empty'));
        } else {
            state.setIn(['verp_hostname', 'error'], null);
        }

        validateNamespace(t, state);

        if (typeKey) {
            this.mailerTypes[typeKey].validate(state);
        }
    }

    async submitHandler() {
        const t = this.props.t;

        let sendMethod, url;
        if (this.props.entity) {
            sendMethod = FormSendMethod.PUT;
            url = `rest/send-configurations/${this.props.entity.id}`
        } else {
            sendMethod = FormSendMethod.POST;
            url = 'rest/send-configurations'
        }

        this.disableForm();
        this.setFormStatusMessage('info', t('Saving ...'));

        const submitSuccessful = await this.validateAndSendFormValuesToURL(sendMethod, url, data => {
            this.mailerTypes[data.mailer_type].beforeSave(data);
            if (!data.verpEnabled) {
                data.verp_hostname = null;
            }
        });

        if (submitSuccessful) {
            this.navigateToWithFlashMessage('/send-configurations', 'success', t('Send configuration saved'));
        } else {
            this.enableForm();
            this.setFormStatusMessage('warning', t('There are errors in the form. Please fix them and submit again.'));
        }
    }

    render() {
        const t = this.props.t;
        const isEdit = !!this.props.entity;
        const canDelete = isEdit && this.props.entity.permissions.includes('delete') && this.props.entity.id !== getSystemSendConfigurationId();

        const typeKey = this.getFormValue('mailer_type');
        let mailerForm = null;
        if (typeKey) {
            mailerForm = this.mailerTypes[typeKey].getForm(this);
        }

        const verpEnabled = this.getFormValue('verpEnabled');

        return (
            <div>
                {canDelete &&
                    <DeleteModalDialog
                        stateOwner={this}
                        visible={this.props.action === 'delete'}
                        deleteUrl={`rest/send-configurations/${this.props.entity.id}`}
                        backUrl={`/send-configurations/${this.props.entity.id}/edit`}
                        successUrl="/send-configurations"
                        deletingMsg={t('Deleting send configuration ...')}
                        deletedMsg={t('Send configuration deleted')}/>
                }

                <Title>{isEdit ? t('Edit Send Configuration') : t('Create Send Configuration')}</Title>

                <Form stateOwner={this} onSubmitAsync={::this.submitHandler}>

                    <InputField id="name" label={t('Name')}/>
                    <TextArea id="description" label={t('Description')}/>
                    <NamespaceSelect/>

                    <Fieldset label={t('Email Header')}>
                        <InputField id="from_email" label={t('Default "from" email')}/>
                        <CheckBox id="from_email_overridable" text={t('Overridable')}/>
                        <InputField id="from_name" label={t('Default "from" name')}/>
                        <CheckBox id="from_name_overridable" text={t('Overridable')}/>
                        <InputField id="reply_to" label={t('Default "reply-to" email')}/>
                        <CheckBox id="reply_to_overridable" text={t('Overridable')}/>
                        <InputField id="subject" label={t('Subject')}/>
                        <CheckBox id="subject_overridable" text={t('Overridable')}/>
                        <InputField id="x_mailer" label={t('X-Mailer')}/>
                    </Fieldset>

                    {mailerForm}
                    {/* TODO - add "Check mail config" button */}

                    <Fieldset label={t('VERP Bounce Handling')}>
                        <Trans><p>Mailtrain is able to use VERP based routing to detect bounces. In this case the message is sent to the recipient using a custom VERP address as the return path of the message. If the message is not accepted a bounce email is sent to this special VERP address and thus a bounce is detected.</p></Trans>
                        <Trans><p>To get VERP working you need to set up a DNS MX record that points to your Mailtrain hostname. You must also ensure that Mailtrain VERP interface is available from port 25 of your server (port 25 usually requires root user privileges). This way if anyone tries to send email to someuser@verp-hostname then the email should end up to this server.</p></Trans>
                        <Trans><p className="text-warning">VERP usually only works if you are using your own SMTP server. Regular relay services (SES, SparkPost, Gmail etc.) tend to remove the VERP address from the message.</p></Trans>
                        {mailtrainConfig.verpEnabled ?
                            <div>
                                <CheckBox id="verpEnabled" text={t('verpEnabled')}/>
                                {verpEnabled && <InputField id="verp_hostname" label={t('Server hostname')} placeholder={t('The VERP server hostname, eg. bounces.example.com')} help={t('VERP bounce handling server hostname. This hostname is used in the SMTP envelope FROM address and the MX DNS records should point to this server')}/>}
                            </div>
                            :
                            <Trans><p>VERP bounce handling server is not enabled. Modify your server configuration file and restart server to enable it.</p></Trans>
                        }
                    </Fieldset>

                    <ButtonRow>
                        <Button type="submit" className="btn-primary" icon="ok" label={t('Save')}/>
                        {canDelete &&
                            <NavButton className="btn-danger" icon="remove" label={t('Delete')} linkTo={`/send-configurations/${this.props.entity.id}/delete`}/>
                        }
                    </ButtonRow>
                </Form>
            </div>
        );
    }
}