<?php
/**
 * WP Cron scheduler for automated daily price updates.
 *
 * @package InformatiqSmartPricing
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Scheduler class.
 */
class Informatiq_SP_Scheduler {
	/**
	 * Price updater instance.
	 *
	 * @var Informatiq_SP_Price_Updater
	 */
	private $price_updater;

	/**
	 * Cron hook name.
	 *
	 * @var string
	 */
	const CRON_HOOK = 'informatiq_sp_daily_price_update';

	/**
	 * Constructor.
	 *
	 * @param Informatiq_SP_Price_Updater $price_updater Price updater instance.
	 */
	public function __construct( $price_updater ) {
		$this->price_updater = $price_updater;

		// Register cron hook.
		add_action( self::CRON_HOOK, array( $this, 'run_daily_update' ) );

		// Add custom cron schedule if needed.
		add_filter( 'cron_schedules', array( $this, 'add_custom_cron_schedule' ) );
	}

	/**
	 * Run daily price update.
	 */
	public function run_daily_update() {
		// Check if we should run the update.
		if ( ! $this->should_run_update() ) {
			return;
		}

		// Set start time.
		update_option( 'informatiq_sp_last_run_start', current_time( 'mysql' ) );

		// Process all products.
		$results = $this->price_updater->process_all_products();

		// Set completion time and results.
		update_option( 'informatiq_sp_last_run_end', current_time( 'mysql' ) );
		update_option( 'informatiq_sp_last_run_results', $results );
	}

	/**
	 * Check if update should run.
	 *
	 * @return bool True if update should run.
	 */
	private function should_run_update() {
		// Check if plugin is properly configured.
		$merchant_id     = get_option( 'informatiq_sp_merchant_id' );
		$service_account = get_option( 'informatiq_sp_service_account' );

		if ( empty( $merchant_id ) || empty( $service_account ) ) {
			return false;
		}

		// Check if auto-update is enabled.
		$auto_update_enabled = get_option( 'informatiq_sp_auto_update_enabled', '1' );

		if ( $auto_update_enabled !== '1' ) {
			return false;
		}

		return true;
	}

	/**
	 * Add custom cron schedule.
	 *
	 * @param array $schedules Existing schedules.
	 * @return array Modified schedules.
	 */
	public function add_custom_cron_schedule( $schedules ) {
		// Add twice daily schedule.
		$schedules['twice_daily'] = array(
			'interval' => 12 * HOUR_IN_SECONDS,
			'display'  => __( 'Twice Daily', 'informatiq-smart-pricing' ),
		);

		// Add custom hourly schedule.
		$schedules['every_6_hours'] = array(
			'interval' => 6 * HOUR_IN_SECONDS,
			'display'  => __( 'Every 6 Hours', 'informatiq-smart-pricing' ),
		);

		return $schedules;
	}

	/**
	 * Get next scheduled run time.
	 *
	 * @return int|false Timestamp of next run or false if not scheduled.
	 */
	public static function get_next_run_time() {
		return wp_next_scheduled( self::CRON_HOOK );
	}

	/**
	 * Get last run information.
	 *
	 * @return array Last run information.
	 */
	public static function get_last_run_info() {
		$last_run_start   = get_option( 'informatiq_sp_last_run_start' );
		$last_run_end     = get_option( 'informatiq_sp_last_run_end' );
		$last_run_results = get_option( 'informatiq_sp_last_run_results', array() );

		return array(
			'start'   => $last_run_start,
			'end'     => $last_run_end,
			'results' => $last_run_results,
		);
	}

	/**
	 * Manually trigger update (for admin interface).
	 *
	 * @return array Results of the update.
	 */
	public function trigger_manual_update() {
		update_option( 'informatiq_sp_last_run_start', current_time( 'mysql' ) );

		$results = $this->price_updater->process_all_products();

		update_option( 'informatiq_sp_last_run_end', current_time( 'mysql' ) );
		update_option( 'informatiq_sp_last_run_results', $results );

		return $results;
	}

	/**
	 * Reschedule cron event with new frequency.
	 *
	 * @param string $frequency Frequency (daily, twice_daily, every_6_hours).
	 * @return bool True if rescheduled successfully.
	 */
	public static function reschedule( $frequency = 'daily' ) {
		// Clear existing schedule.
		$timestamp = wp_next_scheduled( self::CRON_HOOK );
		if ( $timestamp ) {
			wp_unschedule_event( $timestamp, self::CRON_HOOK );
		}

		// Schedule new event.
		return wp_schedule_event( time(), $frequency, self::CRON_HOOK );
	}
}