import { isValidHostname, isValidPort } from "../general";
import { isValidEmail } from "./email";

import type { MailerConfig } from "#types/config";
import type { simpleConfigValidation } from "#types/lib";

function validateMailerConfig(config: MailerConfig): simpleConfigValidation {
	const errors: string[] = [];

	const isValidSMTPAddress = isValidHostname(config.address);

	if (!isValidSMTPAddress) {
		errors.push(`Invalid SMTP address: ${config.address}`);
	}

	if (!isValidPort(config.port)) {
		errors.push(
			`Invalid SMTP port: ${config.port}. Port must be between 1 and 65535`,
		);
	}

	if (!isValidEmail(config.from)) {
		errors.push(`Invalid from email address: ${config.from}`);
	}

	if (!isValidEmail(config.username)) {
		errors.push(`Invalid username email address: ${config.username}`);
	}

	if (!config.password || config.password.trim().length === 0) {
		errors.push("SMTP password is required");
	}

	if (config.port === 465 && !config.secure) {
		errors.push("Port 465 requires SMTP_SECURE=true");
	}

	if (config.port === 587 && config.secure) {
		errors.push("Port 587 typically uses SMTP_SECURE=false with STARTTLS");
	}

	return {
		isValid: errors.length === 0,
		errors,
	};
}

export { isValidPort, isValidEmail, validateMailerConfig };