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<?php

namespace WPMailSMTP\Reports;

use WPMailSMTP\Options;
use WPMailSMTP\Reports\Emails\Summary as SummaryReportEmail;
use WPMailSMTP\Tasks\Reports\SummaryEmailTask;
use WPMailSMTP\WP;

/**
 * Class Reports. Emails stats reports.
 *
 * @since 3.0.0
 */
class Reports {

/**
	 * The WP option key for storing the total number of sent emails.
	 *
	 * @since 3.0.0
	 *
	 * @const string
	 */
	const SENT_EMAILS_COUNTER_OPTION_KEY = 'wp_mail_smtp_lite_sent_email_counter';

/**
	 * The WP option key for storing the total number of sent emails by weeks.
	 *
	 * @since 3.0.0
	 *
	 * @const string
	 */
	const WEEKLY_SENT_EMAILS_COUNTER_OPTION_KEY = 'wp_mail_smtp_lite_weekly_sent_email_counter';

/**
	 * Stats by week retention period. Value in weeks count.
	 * Maximum value is 52 weeks (1 year).
	 *
	 * @since 3.0.0
	 *
	 * @const string
	 */
	const WEEKLY_COUNTER_RETENTION_PERIOD = 12;

/**
	 * Init class.
	 *
	 * @since 3.0.0
	 */
	public function init() {

$this->public_hooks();

if ( WP::in_wp_admin() ) {
			$this->admin_hooks();
		}
	}

/**
	 * Frontend hooks.
	 *
	 * @since 3.0.0
	 */
	private function public_hooks() {

// Update sent email counter when SMTP mailer is used.
		add_action( 'wp_mail_smtp_mailcatcher_smtp_send_after', [ $this, 'update_sent_emails_stats' ] );

// Update sent email counter when all other mailers are used.
		add_action( 'wp_mail_smtp_mailcatcher_send_after', [ $this, 'update_sent_emails_stats' ] );
	}

/**
	 * Admin hooks.
	 *
	 * @since 3.0.0
	 */
	private function admin_hooks() {

add_action( 'load-toplevel_page_wp-mail-smtp', [ $this, 'summary_report_email_preview' ] );

// Detect summary report email constant change.
		if ( Options::init()->is_const_defined( 'general', SummaryReportEmail::SETTINGS_SLUG ) ) {
			add_action( 'admin_init', [ $this, 'detect_summary_report_email_constant_change' ] );
		}
	}

/**
	 * Update all stats after email sent.
	 *
	 * @since 3.0.0
	 */
	public function update_sent_emails_stats() {

if ( wp_mail_smtp()->is_pro() ) {
			return;
		}

$this->increment_sent_emails_counter();
		$this->increment_weekly_sent_emails_counter();
	}

/**
	 * Increment the number of total emails sent by 1.
	 *
	 * @since 3.0.0
	 */
	private function increment_sent_emails_counter() {

$value = $this->get_total_emails_sent() + 1;

update_option( self::SENT_EMAILS_COUNTER_OPTION_KEY, $value, true );
	}

/**
	 * Get the number of total emails sent.
	 *
	 * @since 3.0.0
	 *
	 * @return int
	 */
	public function get_total_emails_sent() {

return get_option( self::SENT_EMAILS_COUNTER_OPTION_KEY, 0 );
	}

/**
	 * Increment the number of total emails sent in this week by 1.
	 *
	 * @since 3.0.0
	 */
	private function increment_weekly_sent_emails_counter() {

$stats = $this->get_total_weekly_emails_sent();

$week = $this->get_current_week();

if ( ! isset( $stats[ $week ] ) ) {
			$stats[ $week ] = 0;
		}

$stats[ $week ] ++;

// Cleanup old stats.
		$stats = array_slice( $stats, self::WEEKLY_COUNTER_RETENTION_PERIOD * - 1, null, true );

update_option( self::WEEKLY_SENT_EMAILS_COUNTER_OPTION_KEY, $stats, true );
	}

/**
	 * Get the number of total emails sent by week.
	 *
	 * When `$week` is `'previous'` or `'two_weeks_ago'` and the calculated ISO week drops
	 * below 1 (year-boundary case), the target week number is derived from the dated
	 * offset (7 or 14 days ago) so it correctly resolves to the prior year's last weeks
	 * (52 or 53) regardless of whether intervening weeks have entries in the stats array.
	 *
	 * @since 3.0.0
	 * @since 4.9.0 Added 'two_weeks_ago' identifier and year-boundary handling.
	 *
	 * @param int|string|null $week One of: null (full array), 'now', 'previous',
	 *                              'two_weeks_ago', or an integer ISO week number.
	 *
	 * @return array|int
	 */
	public function get_total_weekly_emails_sent( $week = null ) {

$stats = get_option( self::WEEKLY_SENT_EMAILS_COUNTER_OPTION_KEY, [] );

if ( is_null( $week ) ) {
			return $stats;
		}

$current_week = $this->get_current_week();

if ( $week === 'now' ) {
			return isset( $stats[ $current_week ] ) ? $stats[ $current_week ] : 0;
		}

if ( $week === 'previous' ) {
			$target = $current_week - 1;

if ( $target < 1 ) {
				$target = (int) wp_date( 'W', strtotime( '-7 days' ) );
			}

return isset( $stats[ $target ] ) ? $stats[ $target ] : 0;
		}

if ( $week === 'two_weeks_ago' ) {
			$target = $current_week - 2;

if ( $target < 1 ) {
				$target = (int) wp_date( 'W', strtotime( '-14 days' ) );
			}

return isset( $stats[ $target ] ) ? $stats[ $target ] : 0;
		}

// Explicit integer ISO week number.
		return isset( $stats[ $week ] ) ? $stats[ $week ] : 0;
	}

/**
	 * Generate a summary report email preview and display it for users.
	 *
	 * @since 3.0.0
	 */
	public function summary_report_email_preview() {

if ( ! current_user_can( wp_mail_smtp()->get_admin()->get_logs_access_capability() ) ) {
			return;
		}

if ( ! isset( $_GET['mode'] ) || $_GET['mode'] !== 'summary_report_email_preview' ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

$email = $this->get_summary_report_email();

echo $email->get_content(); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped

exit;
	}

/**
	 * Get emails stats weekly summary report email.
	 *
	 * @since 3.0.0
	 *
	 * @return SummaryReportEmail
	 */
	public function get_summary_report_email() {

return new SummaryReportEmail();
	}

/**
	 * Detect summary report email constant change.
	 *
	 * @since 3.0.0
	 */
	public function detect_summary_report_email_constant_change() {

if ( ! WP::in_wp_admin() ) {
			return;
		}

if ( ! current_user_can( wp_mail_smtp()->get_capability_manage_options() ) ) {
			return;
		}

if ( Options::init()->is_const_changed( 'general', SummaryReportEmail::SETTINGS_SLUG ) ) {
			( new SummaryEmailTask() )->cancel();
		}
	}

/**
	 * Get current week number.
	 *
	 * @since 3.0.0
	 *
	 * @return int
	 */
	public function get_current_week() {

return current_time( 'W' );
	}
}

Editing: Reports.php

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