/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2025 Spacebar and Spacebar Contributors

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { BaseEmailClient, IEmail } from "./IEmailClient";
import { Config } from "@spacebar/util";

// NOTE: mailgun supports SMTP, is there any point in maintaining this?
export class MailGunEmailClient extends BaseEmailClient {
    mailGun?: unknown;
    mailGunClient?: unknown;
    // mailGun?: import("mailgun.js").default; // for development - doesn't work if package isn't installed
    // mailGunClient?: import("mailgun.js/Classes/MailgunClient").default; // for development - doesn't work if package isn't installed
    override async init(): Promise<void> {
        // get configuration
        const { apiKey, username, domain, isEuropean } = Config.get().email.mailgun;

        // ensure all required configuration values are set
        if (!apiKey || !domain || !username) return console.error("[Email] Mailgun has not been configured correctly.");

        try {
            // try to import the transporter package
            this.mailGun = new (require("mailgun.js").default)(FormData);
        } catch {
            // if the package is not installed, log an error and return void so we don't set the transporter
            console.error("[Email] MailGun transport is not installed. Please run `npm install mailgun.js --save-optional` to install it.");
            return;
        }

        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
        // @ts-expect-error
        this.mailGun.client({ username: username, key: apiKey, url: isEuropean ? "https://api.eu.mailgun.net" : undefined });
    }

    override async sendMail(email: IEmail): Promise<void> {
        if (!this.mailGun) throw new Error("MailGun not initialized");
        if (!this.mailGunClient) throw new Error("MailGun not initialized");
        const { domain } = Config.get().email.mailgun;
        if (!domain) throw new Error("MailGun domain not configured");

        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
        // @ts-expect-error
        await this.mailGunClient.messages.create(domain, {
            to: email.to,
            from: email.from,
            subject: email.subject,
            text: email.text,
            html: email.html,
        });
    }
}
