<?php

namespace WizdomNetworks\WizeWeb\Utils;

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

/**
 * 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()
    {
        $this->mailer = new PHPMailer(true);
        $this->configure();
    }

    /**
     * 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
    {
        $this->mailer->isSMTP();
        $this->mailer->Host = getenv('MAIL_HOST');
        $this->mailer->SMTPAuth = true;
        $this->mailer->Username = getenv('MAIL_USER');
        $this->mailer->Password = getenv('MAIL_PASSWORD');
        $this->mailer->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
        $this->mailer->Port = (int) getenv('MAIL_PORT');
        $this->mailer->setFrom(getenv('MAIL_FROM_EMAIL'), getenv('MAIL_FROM_NAME'));
        Logger::info('Mailer configured successfully.');
    }

    /**
     * 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 {
            $this->mailer->addAddress($to);
            $this->mailer->Subject = $subject;
            $this->mailer->Body = $body;
            $this->mailer->AltBody = $altBody;

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