<?php
/**
 * Handles WP-Cron scheduling for RL MailWarmer.
 */

if (!defined('ABSPATH')) {
    exit;
}

class RL_MailWarmer_Scheduler
{
    /**
     * Initialize the scheduler.
     */
    public static function init()
    {
        // Hook into WP-Cron for sending emails
        add_action('rl_mailwarmer_send_emails', [__CLASS__, 'send_scheduled_emails']);
    }

    /**
     * Schedule WP-Cron jobs.
     */
    public static function schedule_cron_jobs()
    {
        if (!wp_next_scheduled('rl_mailwarmer_send_emails')) {
            wp_schedule_event(time(), 'hourly', 'rl_mailwarmer_send_emails');
        }
    }

    /**
     * Clear WP-Cron jobs on deactivation.
     */
    public static function clear_cron_jobs()
    {
        $timestamp = wp_next_scheduled('rl_mailwarmer_send_emails');
        if ($timestamp) {
            wp_unschedule_event($timestamp, 'rl_mailwarmer_send_emails');
        }
    }

    /**
     * Send scheduled emails for campaigns.
     */
    public static function send_scheduled_emails()
    {
        // Fetch campaigns with active schedules
        $campaigns = get_posts([
            'post_type'   => 'campaign',
            'post_status' => 'publish',
            'meta_query'  => [
                [
                    'key'     => 'email_schedule',
                    'compare' => 'EXISTS',
                ],
            ],
        ]);

        if (!$campaigns) {
            return;
        }

        foreach ($campaigns as $campaign) {
            // Get scheduled emails
            $schedule = get_post_meta($campaign->ID, 'email_schedule', true);

            if (!is_array($schedule)) {
                continue;
            }

            foreach ($schedule as $email) {
                // Check if the email is ready to be sent
                $send_time = strtotime($email['send_time']);
                if ($send_time > time()) {
                    continue;
                }

                // Send the email
                RL_MailWarmer_Email_Handler::send_email($email);

                // Mark as sent
                $email['sent'] = true;
            }

            // Update the schedule
            update_post_meta($campaign->ID, 'email_schedule', $schedule);
        }
    }
}