<?php
/**
 * Kkart coupons.
 *
 * The Kkart coupons class gets coupon data from storage and checks coupon validity.
 *
 * @package Kkart\Classes
 * @version 3.0.0
 */

use Automattic\Kkart\Utilities\NumberUtil;

defined( 'ABSPATH' ) || exit;

require_once dirname( __FILE__ ) . '/legacy/class-kkart-legacy-coupon.php';

/**
 * Coupon class.
 */
class KKART_Coupon extends KKART_Legacy_Coupon {

	/**
	 * Data array, with defaults.
	 *
	 * @since 3.0.0
	 * @var array
	 */
	protected $data = array(
		'code'                        => '',
		'amount'                      => 0,
		'date_created'                => null,
		'date_modified'               => null,
		'date_expires'                => null,
		'discount_type'               => 'fixed_cart',
		'description'                 => '',
		'usage_count'                 => 0,
		'individual_use'              => false,
		'product_ids'                 => array(),
		'excluded_product_ids'        => array(),
		'usage_limit'                 => 0,
		'usage_limit_per_user'        => 0,
		'limit_usage_to_x_items'      => null,
		'free_shipping'               => false,
		'product_categories'          => array(),
		'excluded_product_categories' => array(),
		'exclude_sale_items'          => false,
		'minimum_amount'              => '',
		'maximum_amount'              => '',
		'email_restrictions'          => array(),
		'used_by'                     => array(),
		'virtual'                     => false,
	);

	// Coupon message codes.
	const E_KKART_COUPON_INVALID_FILTERED               = 100;
	const E_KKART_COUPON_INVALID_REMOVED                = 101;
	const E_KKART_COUPON_NOT_YOURS_REMOVED              = 102;
	const E_KKART_COUPON_ALREADY_APPLIED                = 103;
	const E_KKART_COUPON_ALREADY_APPLIED_INDIV_USE_ONLY = 104;
	const E_KKART_COUPON_NOT_EXIST                      = 105;
	const E_KKART_COUPON_USAGE_LIMIT_REACHED            = 106;
	const E_KKART_COUPON_EXPIRED                        = 107;
	const E_KKART_COUPON_MIN_SPEND_LIMIT_NOT_MET        = 108;
	const E_KKART_COUPON_NOT_APPLICABLE                 = 109;
	const E_KKART_COUPON_NOT_VALID_SALE_ITEMS           = 110;
	const E_KKART_COUPON_PLEASE_ENTER                   = 111;
	const E_KKART_COUPON_MAX_SPEND_LIMIT_MET            = 112;
	const E_KKART_COUPON_EXCLUDED_PRODUCTS              = 113;
	const E_KKART_COUPON_EXCLUDED_CATEGORIES            = 114;
	const KKART_COUPON_SUCCESS                          = 200;
	const KKART_COUPON_REMOVED                          = 201;

	/**
	 * Cache group.
	 *
	 * @var string
	 */
	protected $cache_group = 'coupons';

	/**
	 * Coupon constructor. Loads coupon data.
	 *
	 * @param mixed $data Coupon data, object, ID or code.
	 */
	public function __construct( $data = '' ) {
		parent::__construct( $data );

		// If we already have a coupon object, read it again.
		if ( $data instanceof KKART_Coupon ) {
			$this->set_id( absint( $data->get_id() ) );
			$this->read_object_from_database();
			return;
		}

		// This filter allows custom coupon objects to be created on the fly.
		$coupon = apply_filters( 'kkart_get_shop_coupon_data', false, $data, $this );

		if ( $coupon ) {
			$this->read_manual_coupon( $data, $coupon );
			return;
		}

		// Try to load coupon using ID or code.
		if ( is_int( $data ) && 'shop_coupon' === get_post_type( $data ) ) {
			$this->set_id( $data );
		} elseif ( ! empty( $data ) ) {
			$id = kkart_get_coupon_id_by_code( $data );
			// Need to support numeric strings for backwards compatibility.
			if ( ! $id && 'shop_coupon' === get_post_type( $data ) ) {
				$this->set_id( $data );
			} else {
				$this->set_id( $id );
				$this->set_code( $data );
			}
		} else {
			$this->set_object_read( true );
		}

		$this->read_object_from_database();
	}

	/**
	 * If the object has an ID, read using the data store.
	 *
	 * @since 3.4.1
	 */
	protected function read_object_from_database() {
		$this->data_store = KKART_Data_Store::load( 'coupon' );

		if ( $this->get_id() > 0 ) {
			$this->data_store->read( $this );
		}
	}
	/**
	 * Checks the coupon type.
	 *
	 * @param  string $type Array or string of types.
	 * @return bool
	 */
	public function is_type( $type ) {
		return ( $this->get_discount_type() === $type || ( is_array( $type ) && in_array( $this->get_discount_type(), $type, true ) ) );
	}

	/**
	 * Prefix for action and filter hooks on data.
	 *
	 * @since  3.0.0
	 * @return string
	 */
	protected function get_hook_prefix() {
		return 'kkart_coupon_get_';
	}

	/*
	|--------------------------------------------------------------------------
	| Getters
	|--------------------------------------------------------------------------
	|
	| Methods for getting data from the coupon object.
	|
	*/

	/**
	 * Get coupon code.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return string
	 */
	public function get_code( $context = 'view' ) {
		return $this->get_prop( 'code', $context );
	}

	/**
	 * Get coupon description.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return string
	 */
	public function get_description( $context = 'view' ) {
		return $this->get_prop( 'description', $context );
	}

	/**
	 * Get discount type.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return string
	 */
	public function get_discount_type( $context = 'view' ) {
		return $this->get_prop( 'discount_type', $context );
	}

	/**
	 * Get coupon amount.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return float
	 */
	public function get_amount( $context = 'view' ) {
		return kkart_format_decimal( $this->get_prop( 'amount', $context ) );
	}

	/**
	 * Get coupon expiration date.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return KKART_DateTime|NULL object if the date is set or null if there is no date.
	 */
	public function get_date_expires( $context = 'view' ) {
		return $this->get_prop( 'date_expires', $context );
	}

	/**
	 * Get date_created
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return KKART_DateTime|NULL object if the date is set or null if there is no date.
	 */
	public function get_date_created( $context = 'view' ) {
		return $this->get_prop( 'date_created', $context );
	}

	/**
	 * Get date_modified
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return KKART_DateTime|NULL object if the date is set or null if there is no date.
	 */
	public function get_date_modified( $context = 'view' ) {
		return $this->get_prop( 'date_modified', $context );
	}

	/**
	 * Get coupon usage count.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return integer
	 */
	public function get_usage_count( $context = 'view' ) {
		return $this->get_prop( 'usage_count', $context );
	}

	/**
	 * Get the "indvidual use" checkbox status.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return bool
	 */
	public function get_individual_use( $context = 'view' ) {
		return $this->get_prop( 'individual_use', $context );
	}

	/**
	 * Get product IDs this coupon can apply to.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_product_ids( $context = 'view' ) {
		return $this->get_prop( 'product_ids', $context );
	}

	/**
	 * Get product IDs that this coupon should not apply to.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_excluded_product_ids( $context = 'view' ) {
		return $this->get_prop( 'excluded_product_ids', $context );
	}

	/**
	 * Get coupon usage limit.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return integer
	 */
	public function get_usage_limit( $context = 'view' ) {
		return $this->get_prop( 'usage_limit', $context );
	}

	/**
	 * Get coupon usage limit per customer (for a single customer)
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return integer
	 */
	public function get_usage_limit_per_user( $context = 'view' ) {
		return $this->get_prop( 'usage_limit_per_user', $context );
	}

	/**
	 * Usage limited to certain amount of items
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return integer|null
	 */
	public function get_limit_usage_to_x_items( $context = 'view' ) {
		return $this->get_prop( 'limit_usage_to_x_items', $context );
	}

	/**
	 * If this coupon grants free shipping or not.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return bool
	 */
	public function get_free_shipping( $context = 'view' ) {
		return $this->get_prop( 'free_shipping', $context );
	}

	/**
	 * Get product categories this coupon can apply to.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_product_categories( $context = 'view' ) {
		return $this->get_prop( 'product_categories', $context );
	}

	/**
	 * Get product categories this coupon cannot not apply to.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_excluded_product_categories( $context = 'view' ) {
		return $this->get_prop( 'excluded_product_categories', $context );
	}

	/**
	 * If this coupon should exclude items on sale.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return bool
	 */
	public function get_exclude_sale_items( $context = 'view' ) {
		return $this->get_prop( 'exclude_sale_items', $context );
	}

	/**
	 * Get minimum spend amount.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return float
	 */
	public function get_minimum_amount( $context = 'view' ) {
		return $this->get_prop( 'minimum_amount', $context );
	}
	/**
	 * Get maximum spend amount.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return float
	 */
	public function get_maximum_amount( $context = 'view' ) {
		return $this->get_prop( 'maximum_amount', $context );
	}

	/**
	 * Get emails to check customer usage restrictions.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_email_restrictions( $context = 'view' ) {
		return $this->get_prop( 'email_restrictions', $context );
	}

	/**
	 * Get records of all users who have used the current coupon.
	 *
	 * @since  3.0.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return array
	 */
	public function get_used_by( $context = 'view' ) {
		return $this->get_prop( 'used_by', $context );
	}

	/**
	 * If the filter is added through the kkart_get_shop_coupon_data filter, it's virtual and not in the DB.
	 *
	 * @since 3.2.0
	 * @param  string $context What the value is for. Valid values are 'view' and 'edit'.
	 * @return boolean
	 */
	public function get_virtual( $context = 'view' ) {
		return (bool) $this->get_prop( 'virtual', $context );
	}

	/**
	 * Get discount amount for a cart item.
	 *
	 * @param  float      $discounting_amount Amount the coupon is being applied to.
	 * @param  array|null $cart_item          Cart item being discounted if applicable.
	 * @param  boolean    $single             True if discounting a single qty item, false if its the line.
	 * @return float Amount this coupon has discounted.
	 */
	public function get_discount_amount( $discounting_amount, $cart_item = null, $single = false ) {
		$discount      = 0;
		$cart_item_qty = is_null( $cart_item ) ? 1 : $cart_item['quantity'];

		if ( $this->is_type( array( 'percent' ) ) ) {
			$discount = (float) $this->get_amount() * ( $discounting_amount / 100 );
		} elseif ( $this->is_type( 'fixed_cart' ) && ! is_null( $cart_item ) && KKART()->cart->subtotal_ex_tax ) {
			/**
			 * This is the most complex discount - we need to divide the discount between rows based on their price in.
			 * proportion to the subtotal. This is so rows with different tax rates get a fair discount, and so rows.
			 * with no price (free) don't get discounted.
			 *
			 * Get item discount by dividing item cost by subtotal to get a %.
			 *
			 * Uses price inc tax if prices include tax to work around https://github.com/kkart/kkart/issues/7669 and https://github.com/kkart/kkart/issues/8074.
			 */
			if ( kkart_prices_include_tax() ) {
				$discount_percent = ( kkart_get_price_including_tax( $cart_item['data'] ) * $cart_item_qty ) / KKART()->cart->subtotal;
			} else {
				$discount_percent = ( kkart_get_price_excluding_tax( $cart_item['data'] ) * $cart_item_qty ) / KKART()->cart->subtotal_ex_tax;
			}
			$discount = ( (float) $this->get_amount() * $discount_percent ) / $cart_item_qty;

		} elseif ( $this->is_type( 'fixed_product' ) ) {
			$discount = min( $this->get_amount(), $discounting_amount );
			$discount = $single ? $discount : $discount * $cart_item_qty;
		}

		return apply_filters(
			'kkart_coupon_get_discount_amount',
			NumberUtil::round( min( $discount, $discounting_amount ), kkart_get_rounding_precision() ),
			$discounting_amount,
			$cart_item,
			$single,
			$this
		);
	}

	/*
	|--------------------------------------------------------------------------
	| Setters
	|--------------------------------------------------------------------------
	|
	| Functions for setting coupon data. These should not update anything in the
	| database itself and should only change what is stored in the class
	| object.
	|
	*/

	/**
	 * Set coupon code.
	 *
	 * @since 3.0.0
	 * @param string $code Coupon code.
	 */
	public function set_code( $code ) {
		$this->set_prop( 'code', kkart_format_coupon_code( $code ) );
	}

	/**
	 * Set coupon description.
	 *
	 * @since 3.0.0
	 * @param string $description Description.
	 */
	public function set_description( $description ) {
		$this->set_prop( 'description', $description );
	}

	/**
	 * Set discount type.
	 *
	 * @since 3.0.0
	 * @param string $discount_type Discount type.
	 */
	public function set_discount_type( $discount_type ) {
		if ( 'percent_product' === $discount_type ) {
			$discount_type = 'percent'; // Backwards compatibility.
		}
		if ( ! in_array( $discount_type, array_keys( kkart_get_coupon_types() ), true ) ) {
			$this->error( 'coupon_invalid_discount_type', __( 'Invalid discount type', 'kkart' ) );
		}
		$this->set_prop( 'discount_type', $discount_type );
	}

	/**
	 * Set amount.
	 *
	 * @since 3.0.0
	 * @param float $amount Amount.
	 */
	public function set_amount( $amount ) {
		$amount = kkart_format_decimal( $amount );

		if ( ! is_numeric( $amount ) ) {
			$amount = 0;
		}

		if ( $amount < 0 ) {
			$this->error( 'coupon_invalid_amount', __( 'Invalid discount amount', 'kkart' ) );
		}

		if ( 'percent' === $this->get_discount_type() && $amount > 100 ) {
			$this->error( 'coupon_invalid_amount', __( 'Invalid discount amount', 'kkart' ) );
		}

		$this->set_prop( 'amount', $amount );
	}

	/**
	 * Set expiration date.
	 *
	 * @since  3.0.0
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_expires( $date ) {
		$this->set_date_prop( 'date_expires', $date );
	}

	/**
	 * Set date_created
	 *
	 * @since  3.0.0
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_created( $date ) {
		$this->set_date_prop( 'date_created', $date );
	}

	/**
	 * Set date_modified
	 *
	 * @since  3.0.0
	 * @param string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if there is no date.
	 */
	public function set_date_modified( $date ) {
		$this->set_date_prop( 'date_modified', $date );
	}

	/**
	 * Set how many times this coupon has been used.
	 *
	 * @since 3.0.0
	 * @param int $usage_count Usage count.
	 */
	public function set_usage_count( $usage_count ) {
		$this->set_prop( 'usage_count', absint( $usage_count ) );
	}

	/**
	 * Set if this coupon can only be used once.
	 *
	 * @since 3.0.0
	 * @param bool $is_individual_use If is for individual use.
	 */
	public function set_individual_use( $is_individual_use ) {
		$this->set_prop( 'individual_use', (bool) $is_individual_use );
	}

	/**
	 * Set the product IDs this coupon can be used with.
	 *
	 * @since 3.0.0
	 * @param array $product_ids Products IDs.
	 */
	public function set_product_ids( $product_ids ) {
		$this->set_prop( 'product_ids', array_filter( wp_parse_id_list( (array) $product_ids ) ) );
	}

	/**
	 * Set the product IDs this coupon cannot be used with.
	 *
	 * @since 3.0.0
	 * @param array $excluded_product_ids Exclude product IDs.
	 */
	public function set_excluded_product_ids( $excluded_product_ids ) {
		$this->set_prop( 'excluded_product_ids', array_filter( wp_parse_id_list( (array) $excluded_product_ids ) ) );
	}

	/**
	 * Set the amount of times this coupon can be used.
	 *
	 * @since 3.0.0
	 * @param int $usage_limit Usage limit.
	 */
	public function set_usage_limit( $usage_limit ) {
		$this->set_prop( 'usage_limit', absint( $usage_limit ) );
	}

	/**
	 * Set the amount of times this coupon can be used per user.
	 *
	 * @since 3.0.0
	 * @param int $usage_limit Usage limit.
	 */
	public function set_usage_limit_per_user( $usage_limit ) {
		$this->set_prop( 'usage_limit_per_user', absint( $usage_limit ) );
	}

	/**
	 * Set usage limit to x number of items.
	 *
	 * @since 3.0.0
	 * @param int|null $limit_usage_to_x_items Limit usage to X items.
	 */
	public function set_limit_usage_to_x_items( $limit_usage_to_x_items ) {
		$this->set_prop( 'limit_usage_to_x_items', is_null( $limit_usage_to_x_items ) ? null : absint( $limit_usage_to_x_items ) );
	}

	/**
	 * Set if this coupon enables free shipping or not.
	 *
	 * @since 3.0.0
	 * @param bool $free_shipping If grant free shipping.
	 */
	public function set_free_shipping( $free_shipping ) {
		$this->set_prop( 'free_shipping', (bool) $free_shipping );
	}

	/**
	 * Set the product category IDs this coupon can be used with.
	 *
	 * @since 3.0.0
	 * @param array $product_categories List of product categories.
	 */
	public function set_product_categories( $product_categories ) {
		$this->set_prop( 'product_categories', array_filter( wp_parse_id_list( (array) $product_categories ) ) );
	}

	/**
	 * Set the product category IDs this coupon cannot be used with.
	 *
	 * @since 3.0.0
	 * @param array $excluded_product_categories List of excluded product categories.
	 */
	public function set_excluded_product_categories( $excluded_product_categories ) {
		$this->set_prop( 'excluded_product_categories', array_filter( wp_parse_id_list( (array) $excluded_product_categories ) ) );
	}

	/**
	 * Set if this coupon should excluded sale items or not.
	 *
	 * @since 3.0.0
	 * @param bool $exclude_sale_items If should exclude sale items.
	 */
	public function set_exclude_sale_items( $exclude_sale_items ) {
		$this->set_prop( 'exclude_sale_items', (bool) $exclude_sale_items );
	}

	/**
	 * Set the minimum spend amount.
	 *
	 * @since 3.0.0
	 * @param float $amount Minium amount.
	 */
	public function set_minimum_amount( $amount ) {
		$this->set_prop( 'minimum_amount', kkart_format_decimal( $amount ) );
	}

	/**
	 * Set the maximum spend amount.
	 *
	 * @since 3.0.0
	 * @param float $amount Maximum amount.
	 */
	public function set_maximum_amount( $amount ) {
		$this->set_prop( 'maximum_amount', kkart_format_decimal( $amount ) );
	}

	/**
	 * Set email restrictions.
	 *
	 * @since 3.0.0
	 * @param array $emails List of emails.
	 */
	public function set_email_restrictions( $emails = array() ) {
		$emails = array_filter( array_map( 'sanitize_email', array_map( 'strtolower', (array) $emails ) ) );
		foreach ( $emails as $email ) {
			if ( ! is_email( $email ) ) {
				$this->error( 'coupon_invalid_email_address', __( 'Invalid email address restriction', 'kkart' ) );
			}
		}
		$this->set_prop( 'email_restrictions', $emails );
	}

	/**
	 * Set which users have used this coupon.
	 *
	 * @since 3.0.0
	 * @param array $used_by List of user IDs.
	 */
	public function set_used_by( $used_by ) {
		$this->set_prop( 'used_by', array_filter( $used_by ) );
	}

	/**
	 * Set coupon virtual state.
	 *
	 * @param boolean $virtual Whether it is virtual or not.
	 * @since 3.2.0
	 */
	public function set_virtual( $virtual ) {
		$this->set_prop( 'virtual', (bool) $virtual );
	}

	/*
	|--------------------------------------------------------------------------
	| Other Actions
	|--------------------------------------------------------------------------
	*/

	/**
	 * Developers can programmatically return coupons. This function will read those values into our KKART_Coupon class.
	 *
	 * @since 3.0.0
	 * @param string $code   Coupon code.
	 * @param array  $coupon Array of coupon properties.
	 */
	public function read_manual_coupon( $code, $coupon ) {
		foreach ( $coupon as $key => $value ) {
			switch ( $key ) {
				case 'excluded_product_ids':
				case 'exclude_product_ids':
					if ( ! is_array( $coupon[ $key ] ) ) {
						kkart_doing_it_wrong( $key, $key . ' should be an array instead of a string.', '3.0' );
						$coupon['excluded_product_ids'] = kkart_string_to_array( $value );
					}
					break;
				case 'exclude_product_categories':
				case 'excluded_product_categories':
					if ( ! is_array( $coupon[ $key ] ) ) {
						kkart_doing_it_wrong( $key, $key . ' should be an array instead of a string.', '3.0' );
						$coupon['excluded_product_categories'] = kkart_string_to_array( $value );
					}
					break;
				case 'product_ids':
					if ( ! is_array( $coupon[ $key ] ) ) {
						kkart_doing_it_wrong( $key, $key . ' should be an array instead of a string.', '3.0' );
						$coupon[ $key ] = kkart_string_to_array( $value );
					}
					break;
				case 'individual_use':
				case 'free_shipping':
				case 'exclude_sale_items':
					if ( ! is_bool( $coupon[ $key ] ) ) {
						kkart_doing_it_wrong( $key, $key . ' should be true or false instead of yes or no.', '3.0' );
						$coupon[ $key ] = kkart_string_to_bool( $value );
					}
					break;
				case 'expiry_date':
					$coupon['date_expires'] = $value;
					break;
			}
		}
		$this->set_props( $coupon );
		$this->set_code( $code );
		$this->set_id( 0 );
		$this->set_virtual( true );
	}

	/**
	 * Increase usage count for current coupon.
	 *
	 * @param string   $used_by  Either user ID or billing email.
	 * @param KKART_Order $order  If provided, will clear the coupons held by this order.
	 */
	public function increase_usage_count( $used_by = '', $order = null ) {
		if ( $this->get_id() && $this->data_store ) {
			$new_count = $this->data_store->increase_usage_count( $this, $used_by, $order );

			// Bypass set_prop and remove pending changes since the data store saves the count already.
			$this->data['usage_count'] = $new_count;
			if ( isset( $this->changes['usage_count'] ) ) {
				unset( $this->changes['usage_count'] );
			}
		}
	}

	/**
	 * Decrease usage count for current coupon.
	 *
	 * @param string $used_by Either user ID or billing email.
	 */
	public function decrease_usage_count( $used_by = '' ) {
		if ( $this->get_id() && $this->get_usage_count() > 0 && $this->data_store ) {
			$new_count = $this->data_store->decrease_usage_count( $this, $used_by );

			// Bypass set_prop and remove pending changes since the data store saves the count already.
			$this->data['usage_count'] = $new_count;
			if ( isset( $this->changes['usage_count'] ) ) {
				unset( $this->changes['usage_count'] );
			}
		}
	}

	/*
	|--------------------------------------------------------------------------
	| Validation & Error Handling
	|--------------------------------------------------------------------------
	*/

	/**
	 * Returns the error_message string.

	 * @return string
	 */
	public function get_error_message() {
		return $this->error_message;
	}

	/**
	 * Check if a coupon is valid for the cart.
	 *
	 * @deprecated 3.2.0 In favor of KKART_Discounts->is_coupon_valid.
	 * @return bool
	 */
	public function is_valid() {
		$discounts = new KKART_Discounts( KKART()->cart );
		$valid     = $discounts->is_coupon_valid( $this );

		if ( is_wp_error( $valid ) ) {
			$this->error_message = $valid->get_error_message();
			return false;
		}

		return $valid;
	}

	/**
	 * Check if a coupon is valid.
	 *
	 * @return bool
	 */
	public function is_valid_for_cart() {
		return apply_filters( 'kkart_coupon_is_valid_for_cart', $this->is_type( kkart_get_cart_coupon_types() ), $this );
	}

	/**
	 * Check if a coupon is valid for a product.
	 *
	 * @param KKART_Product $product Product instance.
	 * @param array      $values  Values.
	 * @return bool
	 */
	public function is_valid_for_product( $product, $values = array() ) {
		if ( ! $this->is_type( kkart_get_product_coupon_types() ) ) {
			return apply_filters( 'kkart_coupon_is_valid_for_product', false, $product, $this, $values );
		}

		$valid        = false;
		$product_cats = kkart_get_product_cat_ids( $product->is_type( 'variation' ) ? $product->get_parent_id() : $product->get_id() );
		$product_ids  = array( $product->get_id(), $product->get_parent_id() );

		// Specific products get the discount.
		if ( count( $this->get_product_ids() ) && count( array_intersect( $product_ids, $this->get_product_ids() ) ) ) {
			$valid = true;
		}

		// Category discounts.
		if ( count( $this->get_product_categories() ) && count( array_intersect( $product_cats, $this->get_product_categories() ) ) ) {
			$valid = true;
		}

		// No product ids - all items discounted.
		if ( ! count( $this->get_product_ids() ) && ! count( $this->get_product_categories() ) ) {
			$valid = true;
		}

		// Specific product IDs excluded from the discount.
		if ( count( $this->get_excluded_product_ids() ) && count( array_intersect( $product_ids, $this->get_excluded_product_ids() ) ) ) {
			$valid = false;
		}

		// Specific categories excluded from the discount.
		if ( count( $this->get_excluded_product_categories() ) && count( array_intersect( $product_cats, $this->get_excluded_product_categories() ) ) ) {
			$valid = false;
		}

		// Sale Items excluded from discount.
		if ( $this->get_exclude_sale_items() && $product->is_on_sale() ) {
			$valid = false;
		}

		return apply_filters( 'kkart_coupon_is_valid_for_product', $valid, $product, $this, $values );
	}

	/**
	 * Converts one of the KKART_Coupon message/error codes to a message string and.
	 * displays the message/error.
	 *
	 * @param int $msg_code Message/error code.
	 */
	public function add_coupon_message( $msg_code ) {
		$msg = $msg_code < 200 ? $this->get_coupon_error( $msg_code ) : $this->get_coupon_message( $msg_code );

		if ( ! $msg ) {
			return;
		}

		if ( $msg_code < 200 ) {
			kkart_add_notice( $msg, 'error' );
		} else {
			kkart_add_notice( $msg );
		}
	}

	/**
	 * Map one of the KKART_Coupon message codes to a message string.
	 *
	 * @param integer $msg_code Message code.
	 * @return string Message/error string.
	 */
	public function get_coupon_message( $msg_code ) {
		switch ( $msg_code ) {
			case self::KKART_COUPON_SUCCESS:
				$msg = __( 'Coupon code applied successfully.', 'kkart' );
				break;
			case self::KKART_COUPON_REMOVED:
				$msg = __( 'Coupon code removed successfully.', 'kkart' );
				break;
			default:
				$msg = '';
				break;
		}
		return apply_filters( 'kkart_coupon_message', $msg, $msg_code, $this );
	}

	/**
	 * Map one of the KKART_Coupon error codes to a message string.
	 *
	 * @param int $err_code Message/error code.
	 * @return string Message/error string
	 */
	public function get_coupon_error( $err_code ) {
		switch ( $err_code ) {
			case self::E_KKART_COUPON_INVALID_FILTERED:
				$err = __( 'Coupon is not valid.', 'kkart' );
				break;
			case self::E_KKART_COUPON_NOT_EXIST:
				/* translators: %s: coupon code */
				$err = sprintf( __( 'Coupon "%s" does not exist!', 'kkart' ), esc_html( $this->get_code() ) );
				break;
			case self::E_KKART_COUPON_INVALID_REMOVED:
				/* translators: %s: coupon code */
				$err = sprintf( __( 'Sorry, it seems the coupon "%s" is invalid - it has now been removed from your order.', 'kkart' ), esc_html( $this->get_code() ) );
				break;
			case self::E_KKART_COUPON_NOT_YOURS_REMOVED:
				/* translators: %s: coupon code */
				$err = sprintf( __( 'Sorry, it seems the coupon "%s" is not yours - it has now been removed from your order.', 'kkart' ), esc_html( $this->get_code() ) );
				break;
			case self::E_KKART_COUPON_ALREADY_APPLIED:
				$err = __( 'Coupon code already applied!', 'kkart' );
				break;
			case self::E_KKART_COUPON_ALREADY_APPLIED_INDIV_USE_ONLY:
				/* translators: %s: coupon code */
				$err = sprintf( __( 'Sorry, coupon "%s" has already been applied and cannot be used in conjunction with other coupons.', 'kkart' ), esc_html( $this->get_code() ) );
				break;
			case self::E_KKART_COUPON_USAGE_LIMIT_REACHED:
				$err = __( 'Coupon usage limit has been reached.', 'kkart' );
				break;
			case self::E_KKART_COUPON_EXPIRED:
				$err = __( 'This coupon has expired.', 'kkart' );
				break;
			case self::E_KKART_COUPON_MIN_SPEND_LIMIT_NOT_MET:
				/* translators: %s: coupon minimum amount */
				$err = sprintf( __( 'The minimum spend for this coupon is %s.', 'kkart' ), kkart_price( $this->get_minimum_amount() ) );
				break;
			case self::E_KKART_COUPON_MAX_SPEND_LIMIT_MET:
				/* translators: %s: coupon maximum amount */
				$err = sprintf( __( 'The maximum spend for this coupon is %s.', 'kkart' ), kkart_price( $this->get_maximum_amount() ) );
				break;
			case self::E_KKART_COUPON_NOT_APPLICABLE:
				$err = __( 'Sorry, this coupon is not applicable to your cart contents.', 'kkart' );
				break;
			case self::E_KKART_COUPON_EXCLUDED_PRODUCTS:
				// Store excluded products that are in cart in $products.
				$products = array();
				if ( ! KKART()->cart->is_empty() ) {
					foreach ( KKART()->cart->get_cart() as $cart_item_key => $cart_item ) {
						if ( in_array( intval( $cart_item['product_id'] ), $this->get_excluded_product_ids(), true ) || in_array( intval( $cart_item['variation_id'] ), $this->get_excluded_product_ids(), true ) || in_array( intval( $cart_item['data']->get_parent_id() ), $this->get_excluded_product_ids(), true ) ) {
							$products[] = $cart_item['data']->get_name();
						}
					}
				}

				/* translators: %s: products list */
				$err = sprintf( __( 'Sorry, this coupon is not applicable to the products: %s.', 'kkart' ), implode( ', ', $products ) );
				break;
			case self::E_KKART_COUPON_EXCLUDED_CATEGORIES:
				// Store excluded categories that are in cart in $categories.
				$categories = array();
				if ( ! KKART()->cart->is_empty() ) {
					foreach ( KKART()->cart->get_cart() as $cart_item_key => $cart_item ) {
						$product_cats = kkart_get_product_cat_ids( $cart_item['product_id'] );
						$intersect    = array_intersect( $product_cats, $this->get_excluded_product_categories() );

						if ( count( $intersect ) > 0 ) {
							foreach ( $intersect as $cat_id ) {
								$cat          = get_term( $cat_id, 'product_cat' );
								$categories[] = $cat->name;
							}
						}
					}
				}

				/* translators: %s: categories list */
				$err = sprintf( __( 'Sorry, this coupon is not applicable to the categories: %s.', 'kkart' ), implode( ', ', array_unique( $categories ) ) );
				break;
			case self::E_KKART_COUPON_NOT_VALID_SALE_ITEMS:
				$err = __( 'Sorry, this coupon is not valid for sale items.', 'kkart' );
				break;
			default:
				$err = '';
				break;
		}
		return apply_filters( 'kkart_coupon_error', $err, $err_code, $this );
	}

	/**
	 * Map one of the KKART_Coupon error codes to an error string.
	 * No coupon instance will be available where a coupon does not exist,
	 * so this static method exists.
	 *
	 * @param int $err_code Error code.
	 * @return string Error string.
	 */
	public static function get_generic_coupon_error( $err_code ) {
		switch ( $err_code ) {
			case self::E_KKART_COUPON_NOT_EXIST:
				$err = __( 'Coupon does not exist!', 'kkart' );
				break;
			case self::E_KKART_COUPON_PLEASE_ENTER:
				$err = __( 'Please enter a coupon code.', 'kkart' );
				break;
			default:
				$err = '';
				break;
		}
		// When using this static method, there is no $this to pass to filter.
		return apply_filters( 'kkart_coupon_error', $err, $err_code, null );
	}
}