import Handlebars from "handlebars";
import type { Transporter } from "nodemailer";
import nodemailer from "nodemailer";
import type Mail from "nodemailer/lib/mailer/index.js";
import type { Address } from "nodemailer/lib/mailer/index.js";
import type SMTPTransport from "nodemailer/lib/smtp-transport/index.js";
import hbs from "nodemailer-express-handlebars";
import path from "path";
import { fileURLToPath } from "url";
import { promisify } from "util";
import { db } from "../../../../database/dbclient.js";
import { settings } from "../../../../database/schema/settings.js";
import { tryCatch } from "../../../globalUtils/tryCatch.js";
import { installed } from "../../../index.js";
import { createLog } from "../../logger/logger.js";

interface HandlebarsMailOptions extends Mail.Options {
	template: string;
	context: Record<string, unknown>; // Use a generic object for context
}

interface EmailData {
	email: string;
	subject: string;
	template: string;
	context: [];
}

export const sendEmail = async (data: any): Promise<any> => {
	if (!installed) {
		createLog("error", "notify", "notify", "server not installed.");
		return;
	}
	let transporter: Transporter;
	let fromEmail: string | Address;
	const { data: settingData, error: settingError } = await tryCatch(
		db.select().from(settings),
	);

	if (settingError) {
		return {
			success: false,
			message: "There was an error getting the settings.",
			settingError,
		};
	}
	// get the plantToken
	const server = settingData.filter((n) => n.name === "server");

	if (
		server[0].value === "localhostx" &&
		process.env.EMAIL_USER &&
		process.env.EMAIL_PASSWORD
	) {
		transporter = nodemailer.createTransport({
			service: "gmail",
			host: "smtp.gmail.com",
			port: 465,
			auth: {
				user: process.env.EMAIL_USER,
				pass: process.env.EMAIL_PASSWORD,
			},
			//debug: true,
		});

		// update the from email
		fromEmail = process.env.EMAIL_USER;
	} else {
		// convert to the correct plant token.
		const plantToken = settingData.filter((s) => s.name === "plantToken");

		let host = `${plantToken[0].value}-smtp.alpla.net`;

		const testServers = ["test1", "test2", "test3"];

		if (testServers.includes(plantToken[0].value)) {
			host = "USMCD1-smtp.alpla.net";
		}

		if (plantToken[0].value === "usiow2") {
			host = "USIOW1-smtp.alpla.net";
		}

		transporter = nodemailer.createTransport({
			host: host,
			port: 25,
			rejectUnauthorized: false,
			//secure: false,
			// auth: {
			//   user: "alplaprod",
			//   pass: "obelix",
			// },
			debug: true,
		} as SMTPTransport.Options);

		// update the from email
		fromEmail = `donotreply@alpla.com`;
	}

	// creating the handlbar options
	const viewPath = path.resolve(
		path.dirname(fileURLToPath(import.meta.url)),
		"../utils/views/",
	);

	const handlebarOptions = {
		viewEngine: {
			extname: ".hbs",
			//layoutsDir: path.resolve(viewPath, "layouts"), // Path to layouts directory
			defaultLayout: "", // Specify the default layout
			partialsDir: viewPath,
		},
		viewPath: viewPath,
		extName: ".hbs", // File extension for Handlebars templates
	};

	transporter.use("compile", hbs(handlebarOptions));

	const mailOptions: HandlebarsMailOptions = {
		from: fromEmail,
		to: data.email,
		subject: data.subject,
		//text: "You will have a reset token here and only have 30min to click the link before it expires.",
		//html: emailTemplate("BlakesTest", "This is an example with css"),
		template: data.template, // Name of the Handlebars template (e.g., 'welcome.hbs')
		context: data.context,
	};

	// now verify and send the email
	const sendMailPromise = promisify(transporter.sendMail).bind(transporter);

	try {
		// Send email and await the result
		const info = await sendMailPromise(mailOptions);
		createLog(
			"info",
			"notification",
			"system",
			`Email was sent to: ${data.email}`,
		);
		return { success: true, message: "Email sent.", data: info };
	} catch (err) {
		console.log(err);
		createLog(
			"error",
			"notification",
			"system",
			`Error sending Email: ${JSON.stringify(err)}`,
		);
		return { success: false, message: "Error sending email.", error: err };
	}
};