<?php

namespace WizdomNetworks\WizeWeb\Utils;

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
use WizdomNetworks\WizeWeb\Utils\Logger;
use WizdomNetworks\WizeWeb\Utils\ErrorHandler;

/**
 * Mailer Utility
 * 
 * A utility class for sending emails using PHPMailer.
 * 
 * Integrates logging for email success and failure events.
 */
class Mailer
{
    /**
     * @var PHPMailer The PHPMailer instance used for sending emails.
     */
    protected PHPMailer $mailer;

    /**
     * Mailer constructor.
     * 
     * Initializes the PHPMailer instance and configures it based on environment variables.
     * 
     * @throws Exception If PHPMailer configuration fails.
     */
    public function __construct()
    {
        try {
            $this->mailer = new PHPMailer(true);
            $this->configure();
        } catch (Exception $e) {
            Logger::error('Failed to initialize Mailer: ' . $e->getMessage());
            ErrorHandler::exception($e);
            throw $e;
        }
    }

    /**
     * Configures the PHPMailer instance.
     * 
     * Reads email configuration from environment variables such as MAIL_HOST, MAIL_USER, MAIL_PASSWORD, etc.
     * 
     * @throws Exception If any configuration errors occur.
     */
    protected function configure(): void
    {
        try {
            $this->mailer->isSMTP();
            $this->mailer->Host = $_ENV['MAIL_HOST'];
            $this->mailer->SMTPAuth = true;
            $this->mailer->Username = $_ENV['MAIL_USER'];
            $this->mailer->Password = $_ENV['MAIL_PASSWORD'];
            $this->mailer->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
            $this->mailer->Port = (int) $_ENV['MAIL_PORT'];
            $this->mailer->setFrom($_ENV['MAIL_FROM_EMAIL'], $_ENV['MAIL_FROM_NAME']);
            Logger::info('Mailer configured successfully.');
        } catch (Exception $e) {
            Logger::error('Mailer configuration failed: ' . $e->getMessage());
            ErrorHandler::exception($e);
            throw $e;
        }
    }

    /**
     * Sends an email.
     * 
     * @param string $to The recipient's email address.
     * @param string $subject The email subject.
     * @param string $body The HTML content of the email.
     * @param string $altBody The plain-text alternative content of the email (optional).
     * 
     * @return bool True if the email was sent successfully, false otherwise.
     */
    public function send(string $to, string $subject, string $body, string $altBody = ''): bool
    {
        try {
            $this->mailer->clearAddresses();
            $this->mailer->addAddress($to);
            $this->mailer->Subject = $subject;
            $this->mailer->Body = $body;
            $this->mailer->AltBody = $altBody;

            $this->mailer->send();
            Logger::info("Email sent successfully to $to with subject: $subject.");
            return true;
        } catch (Exception $e) {
            Logger::error("Failed to send email to $to: " . $e->getMessage());
            ErrorHandler::exception($e);
            return false;
        }
    }
}