<?php
/**
 * Pass Manager
 *
 * Tool for determining what kind of pass, if any, is activated on the site.
 *
 * @package   easy-digital-downloads
 * @copyright Copyright (c) 2021, Sandhills Development, LLC
 * @license   GPL2+
 * @since     2.10.6
 */

namespace EDD\Admin;

class Pass_Manager {

	const PERSONAL_PASS_ID            = 1245715;
	const EXTENDED_PASS_ID            = 1245716;
	const PROFESSIONAL_PASS_ID        = 1245717;
	const ALL_ACCESS_PASS_ID          = 1150319;
	const ALL_ACCESS_PASS_LIFETIME_ID = 1464807;

	/**
	 * ID of the highest tier pass that's activated.
	 *
	 * @var int|null
	 */
	public $highest_pass_id = null;

	/**
	 * License key of the highest tier pass that's activated.
	 *
	 * @var string|null
	 */
	public $highest_license_key = null;

	/**
	 * Pass data from the database. This will be an array with
	 * the key being the license key, and the value being another
	 * array with the `pass_id` and `time_checked`.
	 *
	 * @var array|null
	 */
	public $pass_data;

	/**
	 * Whether or not we've stored any pass data yet.
	 * If no pass data has been stored, then that means the user
	 * might have a pass activated, we just haven't figured it out
	 * yet and we're still waiting for the first cron to run.
	 *
	 * @see \EDD_License::weekly_license_check()
	 * @see \EDD_License::activate_license()
	 *
	 * @var bool
	 */
	public $has_pass_data = false;

	/**
	 * Number of license keys entered on this site.
	 *
	 * @var int
	 */
	public $number_license_keys;

	/**
	 * Hierarchy of passes. This helps us determine if one pass
	 * is "higher" than another.
	 *
	 * @see Pass_Manager::pass_compare()
	 *
	 * @var int[]
	 */
	private static $pass_hierarchy = array(
		self::PERSONAL_PASS_ID            => 10,
		self::EXTENDED_PASS_ID            => 20,
		self::PROFESSIONAL_PASS_ID        => 30,
		self::ALL_ACCESS_PASS_ID          => 40,
		self::ALL_ACCESS_PASS_LIFETIME_ID => 50,
	);

	/**
	 * The base category assigned to each pass.
	 *
	 * @var int[]
	 */
	public $categories = array(
		self::PERSONAL_PASS_ID     => 2166,
		self::EXTENDED_PASS_ID     => 2165,
		self::PROFESSIONAL_PASS_ID => 2164,
	);

	/**
	 * The pro license.
	 *
	 * @since 3.1.1
	 * @var EDD\Licensing\License
	 */
	private $pro_license;

	/**
	 * Pass_Manager constructor.
	 */
	public function __construct() {
		$this->pro_license = $this->get_pro_license();
		if ( ! empty( $this->pro_license->license ) && 'valid' === $this->pro_license->license ) {
			$this->highest_license_key = $this->pro_license->key;
			$this->highest_pass_id     = $this->get_pass_id_from_pro_license();
			if ( $this->highest_pass_id ) {
				$this->has_pass_data = true;
			}
		} else {
			// Set up the highest pass data.
			$pass_data = get_option( 'edd_pass_licenses' );
			if ( false !== $pass_data ) {
				$this->pass_data     = json_decode( $pass_data, true );
				$this->has_pass_data = true;
			}
			$this->set_highest_pass_data();
		}

		$this->number_license_keys = count( \EDD\Extensions\get_licensed_extension_slugs() );
	}

	/**
	 * Gets the highest pass and defines its data.
	 *
	 * @since 2.11.4
	 * @return void
	 */
	private function set_highest_pass_data() {

		if ( ! $this->has_pass_data || ! is_array( $this->pass_data ) ) {
			return;
		}

		$highest_license_key = null;
		$highest_pass_id     = null;

		foreach ( $this->pass_data as $license_key => $pass_data ) {
			/*
			 * If this pass was last verified more than 2 months ago, we're not using it.
			 * This ensures we never deal with a "stale" record for a pass that's no longer
			 * actually activated, but still exists in our DB array for some reason.
			 *
			 * Our cron job should always be updating with active data once per week.
			 */
			if ( empty( $pass_data['time_checked'] ) || strtotime( '-2 months' ) > $pass_data['time_checked'] ) {
				continue;
			}

			// We need a pass ID.
			if ( empty( $pass_data['pass_id'] ) ) {
				continue;
			}

			// If we don't yet have a "highest pass", then this one is it automatically.
			if ( empty( $highest_pass_id ) ) {
				$highest_license_key = $license_key;
				$highest_pass_id     = intval( $pass_data['pass_id'] );
				continue;
			}

			// Otherwise, this pass only takes over the highest pass if it's actually higher.
			if ( self::pass_compare( (int) $pass_data['pass_id'], $highest_pass_id, '>' ) ) {
				$highest_license_key = $license_key;
				$highest_pass_id     = intval( $pass_data['pass_id'] );
			}
		}

		$this->highest_license_key = $highest_license_key;
		$this->highest_pass_id     = $highest_pass_id;
	}

	/**
	 * Whether or not a pass is activated.
	 *
	 * @since 2.10.6
	 *
	 * @return bool
	 */
	public function has_pass() {
		return ! empty( $this->highest_pass_id );
	}

	/**
	 * If this is a "free install". That means there are no à la carte or pass licenses activated.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function isFree() {
		return 0 === $this->number_license_keys && empty( $this->highest_pass_id );
	}

	/**
	 * If this is a "pro install". This means they have the pro version of EDD installed and a valid pass key.
	 * To check only whether there is an active pass, use `has_pass` instead.
	 *
	 * @since 3.1
	 *
	 * @return bool
	 */
	public static function isPro() {
		if ( ! edd_is_pro() ) {
			return false;
		}
		$license = ( new self() )->pro_license;

		return $license->key && 'valid' === $license->license;
	}

	/**
	 * Gets the pro license object.
	 *
	 * @since 3.1.1
	 * @return EDD\Licensing\License
	 */
	private function get_pro_license() {
		return new \EDD\Licensing\License( 'pro' );
	}

	/**
	 * If this site has an individual product license active (à la carte), but no pass active.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function hasIndividualLicense() {
		return ! $this->isFree() && ! $this->has_pass();
	}

	/**
	 * If this site has a Personal Pass active.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function hasPersonalPass() {
		try {
			return self::pass_compare( $this->highest_pass_id, self::PERSONAL_PASS_ID, '=' );
		} catch ( \Exception $e ) {
			return false;
		}
	}

	/**
	 * If this site has an Extended Pass active.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function hasExtendedPass() {
		try {
			return self::pass_compare( $this->highest_pass_id, self::EXTENDED_PASS_ID, '=' );
		} catch ( \Exception $e ) {
			return false;
		}
	}

	/**
	 * If this site has a Professional Pass active.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function hasProfessionalPass() {
		try {
			return self::pass_compare( $this->highest_pass_id, self::PROFESSIONAL_PASS_ID, '=' );
		} catch ( \Exception $e ) {
			return false;
		}
	}

	/**
	 * If this site has an All Access Pass active.
	 * Note: This uses >= to account for both All Access and lifetime All Access.
	 *
	 * @since 2.11.4
	 *
	 * @return bool
	 */
	public function hasAllAccessPass() {
		try {
			return self::pass_compare( $this->highest_pass_id, self::ALL_ACCESS_PASS_ID, '>=' );
		} catch ( \Exception $e ) {
			return false;
		}
	}

	/**
	 * Compares two passes with each other according to the supplied operator.
	 *
	 * @since 2.10.6
	 *
	 * @param int    $pass_1     ID of the first pass.
	 * @param int    $pass_2     ID of the second pass
	 * @param string $comparison Comparison operator.
	 *
	 * @return bool
	 */
	public static function pass_compare( $pass_1, $pass_2, $comparison = '>' ) {
		if ( ! array_key_exists( $pass_1, self::$pass_hierarchy ) ) {
			return false;
		}
		if ( ! array_key_exists( $pass_2, self::$pass_hierarchy ) ) {
			return false;
		}

		return version_compare( self::$pass_hierarchy[ $pass_1 ], self::$pass_hierarchy[ $pass_2 ], $comparison );
	}

	/**
	 * Whether the current pass can access a product by its categories.
	 *
	 * @param array $categories The array of a product's categories.
	 * @return false|int Returns false if the pass cannot access; returns the pass ID if it can.
	 */
	public function can_access_categories( array $categories ) {
		if ( ! $this->has_pass() ) {
			return false;
		}
		if ( $this->hasAllAccessPass() ) {
			return $this->highest_pass_id;
		}
		$categories_to_check = array_intersect( $this->categories, $categories );
		if ( empty( $categories_to_check ) ) {
			return false;
		}

		foreach ( $categories_to_check as $category_id ) {
			if ( in_array( (int) $category_id, $this->categories, true ) ) {
				$pass_id = array_search( (int) $category_id, $this->categories, true );
				if ( self::pass_compare( $this->highest_pass_id, $pass_id, '>=' ) ) {
					return $pass_id;
				}
			}
		}

		return false;
	}

	/**
	 * Gets the pass name from an ID.
	 *
	 * @since 3.1.1
	 * @param int $pass_id
	 * @return string
	 */
	public function get_pass_name( $pass_id = null ) {
		if ( 'valid' === $this->pro_license->license && ! empty( $this->pro_license->item_name ) ) {
			return $this->pro_license->item_name;
		}
		if ( empty( $pass_id ) ) {
			$pass_id = $this->highest_pass_id;
		}
		$names = array(
			self::PERSONAL_PASS_ID            => __( 'Personal Pass', 'easy-digital-downloads' ),
			self::EXTENDED_PASS_ID            => __( 'Extended Pass', 'easy-digital-downloads' ),
			self::PROFESSIONAL_PASS_ID        => __( 'Professional Pass', 'easy-digital-downloads' ),
			self::ALL_ACCESS_PASS_ID          => __( 'All Access Pass', 'easy-digital-downloads' ),
			self::ALL_ACCESS_PASS_LIFETIME_ID => __( 'Lifetime All Access Pass', 'easy-digital-downloads' ),
		);

		return ! empty( $pass_id ) && array_key_exists( $pass_id, $names ) ? $names[ $pass_id ] : '';
	}

	/**
	 * If the supplied license key is for a pass, updates the `edd_pass_licenses` option with
	 * the pass ID and the date it was checked.
	 *
	 * Note: It's intentional that the `edd_pass_licenses` option is always updated, even if
	 * the provided license data is not for a pass. This is so we have a clearer idea
	 * of when the checks started coming through. If the option doesn't exist in the DB
	 * at all, then we haven't checked any licenses.
	 *
	 * @since 2.10.6
	 * @since 3.1.1 Moved from the license handler class to the Pass Manager class.
	 *
	 * @param string $license
	 * @param object $api_data
	 */
	public function maybe_set_pass_flag( $license, $api_data ) {
		$passes = get_option( 'edd_pass_licenses' );
		$passes = ! empty( $passes ) ? json_decode( $passes, true ) : array();

		if ( ! empty( $api_data->pass_id ) && ! empty( $api_data->license ) && 'valid' === $api_data->license ) {
			$passes[ $license ] = array(
				'pass_id'      => intval( $api_data->pass_id ),
				'time_checked' => time(),
			);
		} elseif ( array_key_exists( $license, $passes ) ) {
			unset( $passes[ $license ] );
		}

		update_option( 'edd_pass_licenses', json_encode( $passes ) );
	}

	/**
	 * Removes the pass flag for the supplied license. This happens when a license
	 * is deactivated.
	 *
	 * @since 2.10.6
	 * @since 3.1.1 Moved from the license handler class to the Pass Manager class.
	 *
	 * @param string $license
	 */
	public function maybe_remove_pass_flag( $license ) {
		$passes = get_option( 'edd_pass_licenses' );
		$passes = ! empty( $passes ) ? json_decode( $passes, true ) : array();

		if ( array_key_exists( $license, $passes ) ) {
			unset( $passes[ $license ] );
		}

		update_option( 'edd_pass_licenses', json_encode( $passes ) );
	}

	/**
	 * Gets the pass ID from the pro license.
	 *
	 * @since 3.1.3
	 * @return int|null
	 */
	private function get_pass_id_from_pro_license() {
		// A valid pro pass should always have a pass ID.
		if ( ! empty( $this->pro_license->pass_id ) && array_key_exists( $this->pro_license->pass_id, self::$pass_hierarchy ) ) {
			return $this->pro_license->pass_id;
		}

		// If the pro license is for a pass, but doesn't have a pass ID, we can try the item ID, if it's in the pass hierarchy
		if ( array_key_exists( $this->pro_license->item_id, self::$pass_hierarchy ) ) {
			return $this->pro_license->item_id;
		}

		return null;
	}

	/**
	 * Gets the pro license object.
	 *
	 * @since 3.4.0
	 * @return \EDD\Licensing\License
	 */
	public function get_pro_license_object() {
		return new \EDD\Licensing\License( 'pro' );
	}
}
