<?php

/**
 * Scheduler class for the RL MailWarmer plugin.
 * Handles scheduling and execution of tasks, including fetching AI-generated content for conversations and sending pending messages
 */
class RL_MailWarmer_Scheduler {

    /**
     * Initialize the scheduler by setting up hooks.
     */
    public static function init() {
        add_filter('cron_schedules', [__CLASS__, 'add_cron_timings']);

        // Call local functions to call the remote classes, so we can debug cron jobs
        add_action('rl_mailwarmer_process_messages', [__CLASS__, 'process_pending_messages']);
        add_action('rl_mailwarmer_process_upcoming_conversations', [__CLASS__, 'process_upcoming_conversations']);
        // add_action('rl_mailwarmer_process_messages', [RL_MailWarmer_Message_Handler::class, 'process_pending_messages']);
        // add_action('rl_mailwarmer_process_upcoming_conversations', [RL_MailWarmer_Conversation_Handler::class, 'process_upcoming_conversations']);


        self::schedule_cron_jobs();
    }

    /**
     * Add a custom schedule for every minute & every 5 minutes.
     *
     * @param array $schedules Existing cron schedules.
     * @return array Modified cron schedules.
     */
    public static function add_cron_timings($schedules) {
        if (!isset($schedules['every_minute'])) {
            $schedules['every_minute'] = [
                'interval' => 60, // 60 seconds = 1 minute
                'display'  => __('Every Minute', 'rl-mailwarmer'),
            ];
            $schedules['every_five_minutes'] = [
                'interval' => 300, 
                'display'  => __('Every 5 Minutes', 'rl-mailwarmer'),
            ];
        }
        return $schedules;
    }

    /**
     * Schedule the cron task if not already scheduled.
     */
    public static function schedule_cron_jobs() {

        // Message handler
        if (!wp_next_scheduled('rl_mailwarmer_process_messages')) {
            wp_schedule_event(time(), 'every_minute', 'rl_mailwarmer_process_messages');
        }

        // Conversation handler
        if (!wp_next_scheduled('rl_mailwarmer_process_upcoming_conversations')) {
            wp_schedule_event(time(), 'every_minute', 'rl_mailwarmer_process_upcoming_conversations');
        }
    }

    /**
     * Clear the scheduled task.
     */
    public static function clear_cron_jobs() {

        // Message handler
        $timestamp = wp_next_scheduled('rl_mailwarmer_process_messages');
        if ($timestamp) {
            wp_unschedule_event($timestamp, 'rl_mailwarmer_process_messages');
        }

        // Conversation handler
        $timestamp = wp_next_scheduled('rl_mailwarmer_process_upcoming_conversations');
        if ($timestamp) {
            wp_unschedule_event($timestamp, 'rl_mailwarmer_process_upcoming_conversations');
        }
    }

    /**
     * Process pending messages by delegating to the Message Handler.
     */
    public static function process_pending_messages() {
        // log_to_file("schedule_cron_jobs ====================== Running Cron to process messages ========================");
        // RL_MailWarmer_Message_Handler::process_pending_messages();
    }

    /**
     * Process pending conversations by delegating to the Message Handler.
     */
    public static function process_upcoming_conversations() {
        // log_to_file("schedule_cron_jobs ====================== Running Cron to process conversations ========================");
        // RL_MailWarmer_Message_Handler::process_upcoming_conversations();
    }
}