<?php

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

// Premium-build-only, same as Argus_Update_Client: excluded from the
// WordPress.org release ZIP (bin/build-release.sh), guarded everywhere with
// class_exists() so the free build never references it. WP.org's guidelines
// prohibit trialware in a plugin submitted to the directory -- the free
// build stays genuinely, permanently functional, with no trial timer and no
// license requirement anywhere in it. This class exists only in a
// separately-distributed Premium build.
class Argus_License {

	const TRIAL_DAYS = 30;

	const TRIAL_STARTED_OPTION = 'argus_wpd_license_trial_started_at';
	const LICENSE_KEY_OPTION   = 'argus_wpd_license_key';
	const LICENSE_STATUS_OPTION = 'argus_wpd_license_validation_status';
	const LICENSE_CHECKED_OPTION = 'argus_wpd_license_last_checked';

	public static function ensure_trial_started() {
		if ( ! get_option( self::TRIAL_STARTED_OPTION ) ) {
			update_option( self::TRIAL_STARTED_OPTION, time(), false );
		}
	}

	public static function trial_started_at() {
		return (int) get_option( self::TRIAL_STARTED_OPTION, time() );
	}

	public static function trial_ends_at() {
		return self::trial_started_at() + ( self::TRIAL_DAYS * DAY_IN_SECONDS );
	}

	public static function days_remaining() {
		$remaining_secs = self::trial_ends_at() - time();
		return max( 0, (int) ceil( $remaining_secs / DAY_IN_SECONDS ) );
	}

	public static function license_key() {
		if ( defined( 'ARGUS_WPD_LICENSE_KEY' ) && ARGUS_WPD_LICENSE_KEY ) {
			return trim( ARGUS_WPD_LICENSE_KEY );
		}
		return trim( (string) get_option( self::LICENSE_KEY_OPTION, '' ) );
	}

	// Saving a submitted key never marks it valid by itself -- the caller
	// still has to call validate_now() to actually check it against the
	// configured validation server, same as entering any license key
	// anywhere always requires a real check before it does anything.
	public static function set_license_key( $key ) {
		update_option( self::LICENSE_KEY_OPTION, trim( (string) $key ), false );
		delete_option( self::LICENSE_STATUS_OPTION );
	}

	public static function validation_endpoint() {
		return defined( 'ARGUS_WPD_LICENSE_VALIDATE_URL' ) ? ARGUS_WPD_LICENSE_VALIDATE_URL : '';
	}

	// Honest, not fabricated: a license key alone never counts as "licensed"
	// unless there's a real validation endpoint configured to actually check
	// it against. No key -> unlicensed. Key present but no validation
	// endpoint configured -> still unlicensed, not a silent green light.
	public static function is_licensed() {
		if ( '' === self::license_key() || '' === self::validation_endpoint() ) {
			return false;
		}
		return 'valid' === get_option( self::LICENSE_STATUS_OPTION, '' );
	}

	public static function validate_now() {
		$key = self::license_key();
		$url = self::validation_endpoint();
		if ( '' === $key ) {
			return array( 'success' => false, 'message' => __( 'Enter a license key first.', 'argus-wordpress-defence' ) );
		}
		if ( '' === $url ) {
			return array( 'success' => false, 'message' => __( 'No license validation server is configured for this deployment.', 'argus-wordpress-defence' ) );
		}

		$response = wp_remote_post(
			$url,
			array(
				'timeout' => 15,
				'headers' => array( 'Content-Type' => 'application/json' ),
				'body'    => wp_json_encode( array( 'license_key' => $key, 'domain' => wp_parse_url( home_url(), PHP_URL_HOST ) ) ),
			)
		);

		update_option( self::LICENSE_CHECKED_OPTION, current_time( 'mysql', true ), false );

		if ( is_wp_error( $response ) || 200 !== (int) wp_remote_retrieve_response_code( $response ) ) {
			update_option( self::LICENSE_STATUS_OPTION, 'error', false );
			return array( 'success' => false, 'message' => __( 'Could not reach the license server. Try again shortly.', 'argus-wordpress-defence' ) );
		}

		$data = json_decode( wp_remote_retrieve_body( $response ), true );
		$valid = is_array( $data ) && ! empty( $data['valid'] );
		update_option( self::LICENSE_STATUS_OPTION, $valid ? 'valid' : 'invalid', false );

		return array(
			'success' => $valid,
			'message' => $valid
				? __( 'License activated.', 'argus-wordpress-defence' )
				: __( 'That license key is not valid or has expired.', 'argus-wordpress-defence' ),
		);
	}

	public static function status() {
		if ( self::is_licensed() ) {
			return 'licensed';
		}
		return self::days_remaining() > 0 ? 'trial' : 'trial_expired';
	}

	public static function summary() {
		return array(
			'status'         => self::status(),
			'days_remaining' => self::days_remaining(),
			'trial_ends_at'  => gmdate( 'Y-m-d H:i:s', self::trial_ends_at() ),
			'has_key'        => '' !== self::license_key(),
			'purchase_url'   => defined( 'ARGUS_WPD_LICENSE_PURCHASE_URL' ) ? ARGUS_WPD_LICENSE_PURCHASE_URL : '',
		);
	}
}