<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * WC_Stripe_Customer class.
 *
 * Represents a Stripe Customer.
 */
class WC_Stripe_Customer {

	/**
	 * Constant for the customer context when adding a payment method.
	 */
	public const CUSTOMER_CONTEXT_ADD_PAYMENT_METHOD = 'add_payment_method';

	/**
	 * Constant for the customer context when paying for an order via the "Pay for Order" page.
	 */
	public const CUSTOMER_CONTEXT_PAY_FOR_ORDER = 'pay_for_order';

	/**
	 * Constants for the customer contexts where minimal billing details are permitted.
	 */
	public const MINIMAL_BILLING_DETAILS_CONTEXTS = [
		self::CUSTOMER_CONTEXT_ADD_PAYMENT_METHOD,
		self::CUSTOMER_CONTEXT_PAY_FOR_ORDER,
	];

	/**
	 * String prefix for Stripe payment methods request transient.
	 */
	const PAYMENT_METHODS_TRANSIENT_KEY = 'stripe_payment_methods_';

	/**
	 * Queryable Stripe payment method types.
	 */
	const STRIPE_PAYMENT_METHODS = [
		WC_Stripe_UPE_Payment_Method_CC::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_LINK::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_Sepa::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_Cash_App_Pay::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_ACH::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_ACSS::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_Bacs_Debit::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_Amazon_Pay::STRIPE_ID,
		WC_Stripe_UPE_Payment_Method_Becs_Debit::STRIPE_ID,
	];

	/**
	 * The maximum value for the `limit` argument in the Stripe payment_methods API.
	 *
	 * @see https://docs.stripe.com/api/payment_methods/customer_list#list_customer_payment_methods-limit
	 */
	protected const PAYMENT_METHODS_API_LIMIT = 100;

	/**
	 * Stripe customer ID
	 *
	 * @var string
	 */
	private $id = '';

	/**
	 * WP User ID
	 *
	 * @var integer
	 */
	private $user_id = 0;

	/**
	 * Data from API
	 *
	 * @var array
	 */
	private $customer_data = [];

	/**
	 * Constructor
	 *
	 * @param int $user_id The WP user ID
	 */
	public function __construct( $user_id = 0 ) {
		if ( $user_id ) {
			$this->set_user_id( $user_id );
			$this->set_id( $this->get_id_from_meta( $user_id ) );
		}
	}

	/**
	 * Get Stripe customer ID.
	 *
	 * @return string
	 */
	public function get_id() {
		return $this->id;
	}

	/**
	 * Set Stripe customer ID.
	 *
	 * @param string|array $id The Stripe customer ID, or an array containing the customer ID for backwards compatibility with pre-3.0 data storage.
	 *
	 * @return void
	 */
	public function set_id( $id ) {
		// Backwards compat for customer ID stored in array format. (Pre 3.0)
		if ( is_array( $id ) && isset( $id['customer_id'] ) ) {
			$id = $id['customer_id'];

			$this->update_id_in_meta( $id );
		}

		$this->id = wc_clean( $id );
	}

	/**
	 * User ID in WordPress.
	 *
	 * @return int
	 */
	public function get_user_id() {
		return absint( $this->user_id );
	}

	/**
	 * Set User ID used by WordPress.
	 *
	 * @param int $user_id
	 */
	public function set_user_id( $user_id ) {
		$this->user_id = absint( $user_id );
	}

	/**
	 * Get user object.
	 *
	 * @return WP_User
	 */
	protected function get_user() {
		return $this->get_user_id() ? get_user_by( 'id', $this->get_user_id() ) : false;
	}

	/**
	 * Store data from the Stripe API about this customer
	 */
	public function set_customer_data( $data ) {
		$this->customer_data = $data;
	}

	/**
	 * Generates the customer request, used for both creating and updating customers.
	 *
	 * @param  array        $args  Additional arguments for the request (optional).
	 * @param WC_Order|null $order The order object (optional). If provided, billing details will be retrieved from the order.
	 *
	 * @return array
	 */
	protected function generate_customer_request( $args = [], $order = null ) {
		// The $order parameter was added in 10.2.0, so check for `$args['order'] for backwards compatibility.
		if ( null === $order && isset( $args['order'] ) && $args['order'] instanceof WC_Order ) {
			$order = $args['order'];
		}
		// Always ensure the old 'order' key is unset
		unset( $args['order'] );
		$user = $this->get_user();
		if ( $user ) {
			$billing_first_name = get_user_meta( $user->ID, 'billing_first_name', true );
			$billing_last_name  = get_user_meta( $user->ID, 'billing_last_name', true );

			// If billing first name does not exists try the user first name.
			if ( empty( $billing_first_name ) ) {
				$billing_first_name = get_user_meta( $user->ID, 'first_name', true );
			}

			// If billing last name does not exists try the user last name.
			if ( empty( $billing_last_name ) ) {
				$billing_last_name = get_user_meta( $user->ID, 'last_name', true );
			}

			// If still empty, fall back to POST/order data (e.g. during auto-account creation).
			if ( empty( $billing_first_name ) ) {
				$billing_first_name = $this->get_billing_data_field( 'billing_first_name', $order );
			}
			if ( empty( $billing_last_name ) ) {
				$billing_last_name = $this->get_billing_data_field( 'billing_last_name', $order );
			}

			$email = $user->user_email;

			// If the user email is not set, use the billing email.
			if ( empty( $email ) ) {
				$email = $this->get_billing_data_field( 'billing_email', $order );
			}

			// translators: %1$s First name, %2$s Second name, %3$s Username.
			$description = sprintf( __( 'Name: %1$s %2$s, Username: %3$s', 'woocommerce-gateway-stripe' ), $billing_first_name, $billing_last_name, $user->user_login );

			$defaults = [
				'email'       => $email,
				'description' => $description,
			];

			$billing_full_name = trim( $billing_first_name . ' ' . $billing_last_name );
			if ( ! empty( $billing_full_name ) ) {
				$defaults['name'] = $billing_full_name;
			}
		} else {
			$billing_email      = $this->get_billing_data_field( 'billing_email', $order );
			$billing_first_name = $this->get_billing_data_field( 'billing_first_name', $order );
			$billing_last_name  = $this->get_billing_data_field( 'billing_last_name', $order );

			// translators: %1$s First name, %2$s Second name.
			$description = sprintf( __( 'Name: %1$s %2$s, Guest', 'woocommerce-gateway-stripe' ), $billing_first_name, $billing_last_name );

			$defaults = [
				'email'       => $billing_email,
				'description' => $description,
			];

			$billing_full_name = trim( $billing_first_name . ' ' . $billing_last_name );
			if ( ! empty( $billing_full_name ) ) {
				$defaults['name'] = $billing_full_name;
			}
		}

		$metadata                      = [];
		$defaults['metadata']          = apply_filters( 'wc_stripe_customer_metadata', $metadata, $user );
		$defaults['preferred_locales'] = $this->get_customer_preferred_locale( $user );

		// Add customer address default values.
		$address_fields = [
			'line1'       => 'billing_address_1',
			'line2'       => 'billing_address_2',
			'postal_code' => 'billing_postcode',
			'city'        => 'billing_city',
			'state'       => 'billing_state',
			'country'     => 'billing_country',
		];
		foreach ( $address_fields as $key => $field ) {
			$value = '';
			if ( $user ) {
				$value = get_user_meta( $user->ID, $field, true );
			}
			if ( empty( $value ) ) {
				$value = $this->get_billing_data_field( $field, $order );
			}
			$defaults['address'][ $key ] = $value;
		}

		return wp_parse_args( $args, $defaults );
	}

	/**
	 * Validate that we have valid data before we try to create a customer.
	 *
	 * @param array       $create_customer_request The base data to build the customer request.
	 * @param null|string $current_context         Flag to indicate whether we are in a context where limited details are permitted.
	 *
	 * @throws WC_Stripe_Exception
	 */
	private function validate_create_customer_request( $create_customer_request, ?string $current_context = null ) {
		/**
		 * Filters the required customer fields when creating a customer in Stripe.
		 *
		 * @since 9.7.0
		 * @since 10.2.0 Added the $create_customer_request parameter.
		 *
		 * @param array $required_fields         The required customer fields as derived from the required billing fields in checkout. In some contexts, like adding a payment method, we allow minimal details to be provided.
		 * @param array $create_customer_request The initial data to build the customer request. This can be used to provide country-specific conditions.
		 */
		$required_fields = apply_filters( 'wc_stripe_create_customer_required_fields', $this->get_create_customer_required_fields( $current_context ), $create_customer_request );

		foreach ( $required_fields as $field => $field_requirements ) {
			if ( true === $field_requirements ) {
				if ( empty( trim( $create_customer_request[ $field ] ?? '' ) ) ) {
					throw new WC_Stripe_Exception(
						sprintf( 'missing_required_customer_field: %s', $field ),
						/* translators: %s is a field name, e.g. 'email' or 'name'. */
						sprintf( __( 'Missing required customer field: %s', 'woocommerce-gateway-stripe' ), $field )
					);
				}
			}
			if ( is_array( $field_requirements ) ) {
				if ( ! isset( $create_customer_request[ $field ] ) || ! is_array( $create_customer_request[ $field ] ) ) {
					throw new WC_Stripe_Exception(
						sprintf( 'missing_required_customer_field: %s', $field ),
						/* translators: %s is a field name, e.g. 'email' or 'name'. */
						sprintf( __( 'Missing required customer field: %s', 'woocommerce-gateway-stripe' ), $field )
					);
				}

				foreach ( $field_requirements as $sub_field => $sub_field_requirements ) {
					if ( true === $sub_field_requirements && empty( trim( $create_customer_request[ $field ][ $sub_field ] ?? '' ) ) ) {
						throw new WC_Stripe_Exception(
							sprintf( 'missing_required_customer_field: %s->%s', $field, $sub_field ),
							/* translators: %1$s is a field name, e.g. address, and %2$s is a secondary field name, e.g. line1 or city. */
							sprintf( __( 'Missing required customer field: %1$s->%2$s', 'woocommerce-gateway-stripe' ), $field, $sub_field )
						);
					}
				}
			}
		}
	}

	/**
	 * Get the list of required fields for the create customer request.
	 *
	 * @param string|null $current_context The context we are creating the customer in.
	 *
	 * @return array
	 */
	private function get_create_customer_required_fields( ?string $current_context = null ) {
		if ( in_array( $current_context, self::MINIMAL_BILLING_DETAILS_CONTEXTS, true ) ) {
			return [
				'email' => true,
			];
		}

		$checkout_billing_fields = WC_Checkout::instance()->get_checkout_fields( 'billing' );
		$required_billing_fields = array_filter(
			$checkout_billing_fields,
			function ( $field_data ) {
				return $field_data['required'] ?? false;
			}
		);

		$required_fields = [];

		if ( isset( $required_billing_fields['billing_email'] ) ) {
			$required_fields['email'] = true;
		}

		if ( isset( $required_billing_fields['billing_first_name'] ) || isset( $required_billing_fields['billing_last_name'] ) ) {
			$required_fields['name'] = true;
		}

		$required_address_fields = [];
		$address_field_mapping   = [
			'billing_address_1' => 'line1',
			'billing_address_2' => 'line2',
			'billing_city'      => 'city',
			'billing_country'   => 'country',
			'billing_postcode'  => 'postal_code',
			'billing_state'     => 'state',
		];

		foreach ( $address_field_mapping as $field => $stripe_field_name ) {
			if ( isset( $required_billing_fields[ $field ] ) ) {
				$required_address_fields[ $stripe_field_name ] = true;
			}
		}

		if ( [] !== $required_address_fields ) {
			$required_fields['address'] = $required_address_fields;
		}

		return $required_fields;
	}

	/**
	 * Get value of billing data field, either from POST or order object.
	 *
	 * @param string        $field Field name.
	 * @param WC_Order|null $order The order object (optional).
	 *
	 * @return string
	 */
	private function get_billing_data_field( $field, $order = null ) {
		$valid_fields = [
			'billing_email',
			'billing_first_name',
			'billing_last_name',
			'billing_address_1',
			'billing_address_2',
			'billing_postcode',
			'billing_city',
			'billing_state',
			'billing_country',
		];

		// Restrict field parameter to list of known billing fields.
		if ( ! in_array( $field, $valid_fields, true ) ) {
			return '';
		}

		// Prioritize POST data, if available.
		if ( isset( $_POST[ $field ] ) ) {
			$filter = 'billing_email' === $field ? FILTER_SANITIZE_EMAIL : FILTER_SANITIZE_SPECIAL_CHARS;
			return filter_var( wp_unslash( $_POST[ $field ] ), $filter ); // phpcs:ignore WordPress.Security.NonceVerification
		}

		if ( $order instanceof WC_Order ) {
			switch ( $field ) {
				case 'billing_email':
					return $order->get_billing_email();
				case 'billing_first_name':
					return $order->get_billing_first_name();
				case 'billing_last_name':
					return $order->get_billing_last_name();
				case 'billing_address_1':
					return $order->get_billing_address_1();
				case 'billing_address_2':
					return $order->get_billing_address_2();
				case 'billing_postcode':
					return $order->get_billing_postcode();
				case 'billing_city':
					return $order->get_billing_city();
				case 'billing_state':
					return $order->get_billing_state();
				case 'billing_country':
					return $order->get_billing_country();
				default:
					return '';
			}
		}

		return '';
	}

	/**
	 * If customer does not exist, create a new customer. Else retrieve the Stripe customer through the API to check it's existence.
	 * Recreate the customer if it does not exist in this Stripe account.
	 *
	 * @return string Customer ID
	 *
	 * @throws WC_Stripe_Exception
	 */
	public function maybe_create_customer() {
		if ( ! $this->get_id() ) {
			$customer_id = $this->create_customer();
			$this->set_id( $customer_id );
			return $customer_id;
		}

		$response = WC_Stripe_API::retrieve( 'customers/' . $this->get_id() );

		if ( ! empty( $response->error ) ) {
			if ( $this->is_no_such_customer_error( $response->error ) ) {
				// This can happen when switching the main Stripe account or importing users from another site.
				// Recreate the customer in this case.
				return $this->recreate_customer();
			}

			throw new WC_Stripe_Exception( print_r( $response, true ), $response->error->message );
		}

		return $response->id;
	}

	/**
	 * Search for an existing customer in Stripe account by email and name.
	 *
	 * @param string $email Customer email.
	 * @param string $name  Customer name.
	 * @return array
	 */
	public function get_existing_customer( $email, $name ) {
		$search_query    = [ 'query' => 'name:\'' . $name . '\' AND email:\'' . $email . '\'' ];
		$search_response = WC_Stripe_API::request( $search_query, 'customers/search', 'GET' );

		if ( ! empty( $search_response->error ) ) {
			return [];
		}

		return $search_response->data[0] ?? [];
	}

	/**
	 * Create a customer via API.
	 *
	 * @param array         $args            Additional arguments for the request (optional).
	 * @param string|null   $current_context The context we are creating the customer in (optional).
	 * @param WC_Order|null $order           The order object (optional). If provided, billing details will be retrieved from the order.
	 *
	 * @return string Stripe customer ID in the format `cus_XXXXXXXXXXXXXX`
	 *
	 * @throws WC_Stripe_Exception
	 */
	public function create_customer( $args = [], $current_context = null, $order = null ) {
		$args = $this->generate_customer_request( $args, $order );

		// For guest users, check if a customer already exists with the same email and name in Stripe account before creating a new one.
		if ( ! $this->get_id() && 0 === $this->get_user_id() && ! empty( $args['email'] ) && ! empty( $args['name'] ) ) {
			$response = $this->get_existing_customer( $args['email'], $args['name'] );
		}

		// $current_context was initially introduced as a boolean flag, so check for old callers.
		$current_context = $this->normalize_current_context( $current_context );

		if ( empty( $response ) ) {
			/**
			 * Filters the arguments used to create a customer.
			 *
			 * @since 4.0.0
			 *
			 * @param array $args The arguments used to create a customer.
			 */
			$create_customer_args = apply_filters( 'wc_stripe_create_customer_args', $args );

			$this->validate_create_customer_request( $create_customer_args, $current_context );

			$response = WC_Stripe_API::request( $create_customer_args, 'customers' );
		} else {
			/**
			 * This filter is documented in includes/class-wc-stripe-customer.php.
			 */
			$update_customer_args = apply_filters( 'wc_stripe_update_customer_args', $args );
			$response             = WC_Stripe_API::request( $update_customer_args, 'customers/' . $response->id );
		}

		if ( ! empty( $response->error ) ) {
			throw new WC_Stripe_Exception( print_r( $response, true ), $response->error->message );
		}

		$this->set_id( $response->id );
		$this->clear_cache();
		$this->set_customer_data( $response );

		if ( $this->get_user_id() ) {
			$this->update_id_in_meta( $response->id );
		}

		do_action( 'woocommerce_stripe_add_customer', $args, $response );

		return $response->id;
	}

	/**
	 * Updates the Stripe customer through the API.
	 *
	 * @param array         $args     Additional arguments for the request (optional).
	 * @param bool          $is_retry Whether the current call is a retry (optional, defaults to false). If true, then an exception will be thrown instead of further retries on error.
	 * @param WC_Order|null $order    The order object (optional). If provided, billing details will be retrieved from the order.
	 *
	 * @return string Stripe customer ID in the format `cus_XXXXXXXXXXXXXX`
	 *
	 * @throws WC_Stripe_Exception
	 */
	public function update_customer( $args = [], $is_retry = false, $order = null ) {
		if ( empty( $this->get_id() ) ) {
			throw new WC_Stripe_Exception( 'id_required_to_update_user', __( 'Attempting to update a Stripe customer without a customer ID.', 'woocommerce-gateway-stripe' ) );
		}

		$args = $this->generate_customer_request( $args, $order );

		/**
		 * Filters the arguments used to update a customer.
		 *
		 * @since 4.3.1
		 *
		 * @param array $args The arguments used to update a customer.
		 */
		$args     = apply_filters( 'wc_stripe_update_customer_args', $args );
		$response = WC_Stripe_API::request( $args, 'customers/' . $this->get_id() );

		if ( ! empty( $response->error ) ) {
			if ( $this->is_no_such_customer_error( $response->error ) && ! $is_retry ) {
				// This can happen when switching the main Stripe account or importing users from another site.
				// If not already retrying, recreate the customer and then try updating it again.
				$this->recreate_customer();
				return $this->update_customer( $args, true );
			}

			throw new WC_Stripe_Exception( print_r( $response, true ), $response->error->message );
		}

		$this->clear_cache();
		$this->set_customer_data( $response );

		do_action( 'woocommerce_stripe_update_customer', $args, $response );

		return $this->get_id();
	}

	/**
	 * Updates existing Stripe customer or creates new customer for User through API.
	 *
	 * @param array         $args            Additional arguments for the request (optional).
	 * @param string|null   $current_context The context we are creating the customer in (optional).
	 * @param WC_Order|null $order           The order object (optional). If provided, billing details will be retrieved from the order.
	 *
	 * @return string Stripe customer ID in the format `cus_XXXXXXXXXXXXXX`
	 *
	 * @throws WC_Stripe_Exception
	 */
	public function update_or_create_customer( $args = [], $current_context = null, $order = null ) {
		if ( empty( $this->get_id() ) ) {
			// $current_context was initially introduced as a boolean flag, so check for old callers.
			$current_context = $this->normalize_current_context( $current_context );

			return $this->recreate_customer( $args, $current_context, $order );
		} else {
			return $this->update_customer( $args, false, $order );
		}
	}

	/**
	 * Normalize the current context to a string, as the argument was initially introduced as a boolean flag.
	 *
	 * @param string|bool|null $current_context The current context.
	 * @return string|null The normalized context.
	 */
	private function normalize_current_context( $current_context ): ?string {
		if ( null === $current_context ) {
			return null;
		}

		if ( is_bool( $current_context ) ) {
			return $current_context ? self::CUSTOMER_CONTEXT_ADD_PAYMENT_METHOD : null;
		}

		if ( is_string( $current_context ) ) {
			return $current_context;
		}

		return null;
	}

	/**
	 * Checks to see if error is of invalid request
	 * error and it is no such customer.
	 *
	 * @since 4.1.2
	 * @param array $error
	 */
	public function is_no_such_customer_error( $error ) {
		return (
			$error &&
			'invalid_request_error' === $error->type &&
			preg_match( '/No such customer/i', $error->message )
		);
	}

	/**
	 * Checks to see if error is of invalid request
	 * error and it is no such customer.
	 *
	 * @since 4.5.6
	 * @param array $error
	 * @return bool
	 */
	public function is_source_already_attached_error( $error ) {
		return (
			$error &&
			'invalid_request_error' === $error->type &&
			preg_match( '/already been attached to a customer/i', $error->message )
		);
	}

	/**
	 * Add a source for this stripe customer.
	 *
	 * @param string $source_id
	 * @return WP_Error|int
	 */
	public function add_source( $source_id ) {
		$response = WC_Stripe_API::get_payment_method( $source_id );

		if ( ! empty( $response->error ) || is_wp_error( $response ) ) {
			return $response;
		}

		// Add token to WooCommerce.
		$wc_token = false;

		if ( $this->get_user_id() && class_exists( 'WC_Payment_Token_CC' ) ) {
			if ( ! empty( $response->type ) ) {
				switch ( $response->type ) {
					case WC_Stripe_Payment_Methods::ALIPAY:
						break;
					case WC_Stripe_Payment_Methods::SEPA_DEBIT:
						$wc_token = new WC_Payment_Token_SEPA();
						$wc_token->set_token( $response->id );
						$wc_token->set_gateway_id( 'stripe_sepa' );
						$wc_token->set_last4( $response->sepa_debit->last4 );
						$wc_token->set_fingerprint( $response->sepa_debit->fingerprint );
						break;
					default:
						if ( WC_Stripe_Helper::is_card_payment_method( $response ) ) {
							$wc_token = new WC_Stripe_Payment_Token_CC();
							$wc_token->set_token( $response->id );
							$wc_token->set_gateway_id( 'stripe' );
							$wc_token->set_card_type( strtolower( $response->card->brand ) );
							$wc_token->set_last4( $response->card->last4 );
							$wc_token->set_expiry_month( $response->card->exp_month );
							$wc_token->set_expiry_year( $response->card->exp_year );
							$wc_token->set_fingerprint( $response->card->fingerprint );
						}
						break;
				}
			} else {
				// Legacy.
				$wc_token = new WC_Stripe_Payment_Token_CC();
				$wc_token->set_token( $response->id );
				$wc_token->set_gateway_id( 'stripe' );
				$wc_token->set_card_type( strtolower( $response->brand ) );
				$wc_token->set_last4( $response->last4 );
				$wc_token->set_expiry_month( $response->exp_month );
				$wc_token->set_expiry_year( $response->exp_year );
				$wc_token->set_fingerprint( $response->fingerprint );
			}

			$wc_token->set_user_id( $this->get_user_id() );
			$wc_token->save();
		}

		$this->clear_cache();

		do_action( 'woocommerce_stripe_add_source', $this->get_id(), $wc_token, $response, $source_id );

		return $response->id;
	}

	/**
	 * Attaches a source to the Stripe customer.
	 *
	 * @param string $source_id The ID of the new source.
	 * @return object|WP_Error Either a source object, or a WP error.
	 */
	public function attach_source( $source_id ) {
		if ( ! $this->get_id() ) {
			$this->set_id( $this->create_customer() );
		}

		$response = WC_Stripe_API::attach_payment_method_to_customer( $this->get_id(), $source_id );

		if ( ! empty( $response->error ) ) {
			// It is possible the WC user once was linked to a customer on Stripe
			// but no longer exists. Instead of failing, lets try to create a
			// new customer.
			if ( $this->is_no_such_customer_error( $response->error ) ) {
				$this->recreate_customer();
				return $this->attach_source( $source_id );
			} elseif ( $this->is_source_already_attached_error( $response->error ) ) {
				return WC_Stripe_API::get_payment_method( $source_id );
			} else {
				return $response;
			}
		} elseif ( empty( $response->id ) ) {
			return new WP_Error( 'error', __( 'Unable to add payment source.', 'woocommerce-gateway-stripe' ) );
		} else {
			return $response;
		}
	}

	/**
	 * Get a customers saved sources using their Stripe ID.
	 *
	 * @param  string $customer_id
	 * @return array
	 */
	public function get_sources() {
		if ( ! $this->get_id() ) {
			return [];
		}

		$sources = get_transient( 'stripe_sources_' . $this->get_id() );

		if ( false === $sources ) {
			$response = WC_Stripe_API::request(
				[
					'limit' => 100,
				],
				'customers/' . $this->get_id() . '/payment_methods',
				'GET'
			);

			if ( ! empty( $response->error ) ) {
				return [];
			}

			if ( is_array( $response->data ) ) {
				$sources = $response->data;
			}

			set_transient( 'stripe_sources_' . $this->get_id(), $sources, DAY_IN_SECONDS );
		}

		return empty( $sources ) ? [] : $sources;
	}

	/**
	 * Gets saved payment methods for a customer using Intentions API.
	 *
	 * @param string $payment_method_type Stripe ID of payment method type
	 *
	 * @return array
	 */
	public function get_payment_methods( $payment_method_type ) {
		if ( ! $this->get_id() ) {
			return [];
		}

		$payment_methods = get_transient( self::PAYMENT_METHODS_TRANSIENT_KEY . $payment_method_type . $this->get_id() );

		if ( false === $payment_methods ) {
			$params   = WC_Stripe_UPE_Payment_Method_Sepa::STRIPE_ID === $payment_method_type ? '?expand[]=data.sepa_debit.generated_from.charge&expand[]=data.sepa_debit.generated_from.setup_attempt' : '';
			$response = WC_Stripe_API::request(
				[
					'customer' => $this->get_id(),
					'type'     => $payment_method_type,
					'limit'    => self::PAYMENT_METHODS_API_LIMIT,
				],
				'payment_methods' . $params,
				'GET'
			);

			if ( ! empty( $response->error ) ) {
				if (
					isset( $response->error->code, $response->error->param, $response->error->type )
					&& 'customer' === $response->error->param
					&& 'resource_missing' === $response->error->code
					&& 'invalid_request_error' === $response->error->type
				) {
					// If the customer doesn't exist, cache an empty array as a result.
					set_transient( self::PAYMENT_METHODS_TRANSIENT_KEY . $payment_method_type . $this->get_id(), [], DAY_IN_SECONDS );
				}
				return [];
			}

			if ( is_array( $response->data ) ) {
				$payment_methods = $response->data;
			}

			set_transient( self::PAYMENT_METHODS_TRANSIENT_KEY . $payment_method_type . $this->get_id(), $payment_methods, DAY_IN_SECONDS );
		}

		return empty( $payment_methods ) ? [] : $payment_methods;
	}

	/**
	 * Get all payment methods for a customer.
	 *
	 * @param string[] $payment_method_types The payment method types to look for using Stripe method IDs. If the array is empty, it implies all payment method types.
	 * @param int      $limit                The maximum number of payment methods to return. If the value is -1, no limit is applied.
	 * @return array
	 */
	public function get_all_payment_methods( array $payment_method_types = [], int $limit = -1 ) {
		if ( ! $this->get_id() ) {
			return [];
		}

		$cache_key           = self::PAYMENT_METHODS_TRANSIENT_KEY . '__all_' . $this->get_id();
		$all_payment_methods = get_transient( $cache_key );

		if ( false === $all_payment_methods || ! is_array( $all_payment_methods ) ) {
			$all_payment_methods    = [];
			$last_payment_method_id = null;

			do {
				$request_params = [
					'customer' => $this->get_id(),
					'limit'    => self::PAYMENT_METHODS_API_LIMIT,
				];

				if ( $last_payment_method_id ) {
					$request_params['starting_after'] = $last_payment_method_id;
				}

				$response = WC_Stripe_API::request( $request_params, 'payment_methods?expand[]=data.sepa_debit.generated_from.charge&expand[]=data.sepa_debit.generated_from.setup_attempt', 'GET' );

				if ( ! empty( $response->error ) ) {
					if (
						isset( $response->error->param, $response->error->code )
						&& 'customer' === $response->error->param
						&& 'resource_missing' === $response->error->code
					) {
						// If the customer doesn't exist, cache an empty array.
						set_transient( $cache_key, [], DAY_IN_SECONDS );
					}
					return [];
				}

				if ( ! is_array( $response->data ) || [] === $response->data ) {
					break;
				}

				$all_payment_methods = array_merge( $all_payment_methods, $response->data );

				// Reset the last payment method ID so we can paginate correctly.
				$last_payment_method_id = null;
				if ( isset( $response->has_more ) && $response->has_more ) {
					$last_payment_method = end( $response->data );

					if ( $last_payment_method && ! empty( $last_payment_method->id ) ) {
						$last_payment_method_id = $last_payment_method->id;
					}
				}
			} while ( null !== $last_payment_method_id );

			// Always cache the result without any filters applied.
			set_transient( $cache_key, $all_payment_methods, DAY_IN_SECONDS );
		}

		// If there are no payment methods, no need to apply any filters below.
		if ( [] === $all_payment_methods ) {
			return $all_payment_methods;
		}

		// Only apply the limit and type filters after fetching and caching all payment methods.
		$filtered_payment_methods = $all_payment_methods;
		if ( [] !== $payment_method_types ) {
			$filtered_payment_methods = array_filter(
				$filtered_payment_methods,
				function ( $payment_method ) use ( $payment_method_types ) {
					return in_array( $payment_method->type, $payment_method_types, true );
				}
			);
		}

		if ( $limit > 0 ) {
			return array_slice( $filtered_payment_methods, 0, $limit );
		}

		return $filtered_payment_methods;
	}

	/**
	 * Delete a source from stripe.
	 *
	 * @param string $source_id
	 */
	public function delete_source( $source_id ) {
		if ( empty( $source_id ) || ! $this->get_id() ) {
			return false;
		}

		$response = WC_Stripe_API::detach_payment_method_from_customer( $this->get_id(), $source_id );

		if ( empty( $response->error ) ) {
			$this->clear_cache( $source_id );
			do_action( 'wc_stripe_delete_source', $this->get_id(), $response );

			return true;
		}

		return false;
	}

	/**
	 * Detach a payment method from stripe.
	 *
	 * @param string $payment_method_id
	 */
	public function detach_payment_method( $payment_method_id ) {
		if ( ! $this->get_id() ) {
			return false;
		}

		$response = WC_Stripe_API::detach_payment_method_from_customer( $this->get_id(), $payment_method_id );

		if ( empty( $response->error ) ) {
			$this->clear_cache( $payment_method_id );
			do_action( 'wc_stripe_detach_payment_method', $this->get_id(), $response );

			return true;
		}

		return false;
	}

	/**
	 * Set default source in Stripe
	 *
	 * @param string $source_id The ID of the source to set as default.
	 * @return bool True if the default source was set successfully, false otherwise.
	 * @throws WC_Stripe_Exception
	 */
	public function set_default_source( $source_id ): bool {
		$response = WC_Stripe_API::request(
			[
				'default_source' => sanitize_text_field( $source_id ),
			],
			'customers/' . $this->get_id(),
			'POST'
		);

		if ( empty( $response->error ) ) {
			// Clear cache so that the payment methods list from Stripe is refreshed to have the correct default payment method.
			$this->clear_cache();

			do_action( 'wc_stripe_set_default_source', $this->get_id(), $response );

			return true;
		}

		return false;
	}

	/**
	 * Set default payment method in Stripe
	 *
	 * @param string $payment_method_id The ID of the payment method to set as default.
	 * @return bool True if the default payment method was set successfully, false otherwise.
	 * @throws WC_Stripe_Exception
	 */
	public function set_default_payment_method( $payment_method_id ): bool {
		$response = WC_Stripe_API::request(
			[
				'invoice_settings' => [
					'default_payment_method' => sanitize_text_field( $payment_method_id ),
				],
			],
			'customers/' . $this->get_id(),
			'POST'
		);

		if ( empty( $response->error ) ) {
			// Clear cache so that the payment methods list from Stripe is refreshed to have the correct default payment method.
			$this->clear_cache();

			do_action( 'wc_stripe_set_default_payment_method', $this->get_id(), $response );

			return true;
		}

		return false;
	}

	/**
	 * Deletes caches for this users cards.
	 *
	 * @param string|null $payment_method_id The ID of the payment method to clear cache for, if specified.
	 */
	public function clear_cache( $payment_method_id = null ) {
		delete_transient( 'stripe_sources_' . $this->get_id() );
		delete_transient( 'stripe_customer_' . $this->get_id() );
		foreach ( self::STRIPE_PAYMENT_METHODS as $payment_method_type ) {
			delete_transient( self::PAYMENT_METHODS_TRANSIENT_KEY . $payment_method_type . $this->get_id() );
		}
		delete_transient( self::PAYMENT_METHODS_TRANSIENT_KEY . '__all_' . $this->get_id() );
		// Clear cache for the specific payment method if provided.
		if ( $payment_method_id ) {
			WC_Stripe_Database_Cache::delete( 'payment_method_for_source_' . $payment_method_id );
		}
		$this->customer_data = [];
	}

	/**
	 * Retrieves the Stripe Customer ID from the user meta.
	 *
	 * @param  int $user_id The ID of the WordPress user.
	 * @return string|bool  Either the Stripe ID or false.
	 */
	public function get_id_from_meta( $user_id ) {
		return get_user_option( '_stripe_customer_id', $user_id );
	}

	/**
	 * Updates the current user with the right Stripe ID in the meta table.
	 *
	 * @param string $id The Stripe customer ID.
	 */
	public function update_id_in_meta( $id ) {
		update_user_option( $this->get_user_id(), '_stripe_customer_id', $id, false );
	}

	/**
	 * Deletes the user ID from the meta table with the right key.
	 */
	public function delete_id_from_meta() {
		delete_user_option( $this->get_user_id(), '_stripe_customer_id', false );
	}

	/**
	 * Recreates the customer for this user.
	 *
	 * @param array         $args            Additional arguments for the request (optional).
	 * @param string|null   $current_context The context we are creating the customer in (optional).
	 * @param WC_Order|null $order           The order object (optional). If provided, billing details will be retrieved from the order.
	 *
	 * @return string ID of the new Customer object.
	 */
	private function recreate_customer( $args = [], ?string $current_context = null, $order = null ) {
		$this->delete_id_from_meta();
		return $this->create_customer( $args, $current_context, $order );
	}

	/**
	 * Get the customer's preferred locale based on the user or site setting.
	 *
	 * @param object $user The user being created/modified.
	 * @return array The matched locale string wrapped in an array, or empty default.
	 */
	public function get_customer_preferred_locale( $user ) {
		$locale = $this->get_customer_locale( $user );

		// Options based on Stripe locales.
		// https://support.stripe.com/questions/language-options-for-customer-emails
		$stripe_locales = [
			'ar'             => 'ar-AR',
			'da_DK'          => 'da-DK',
			'de_CH'          => 'de-DE',
			'de_CH_informal' => 'de-DE',
			'de_DE'          => 'de-DE',
			'de_DE_formal'   => 'de-DE',
			'en'             => 'en-US',
			'es_ES'          => 'es-ES',
			'es_CL'          => 'es-419',
			'es_AR'          => 'es-419',
			'es_CO'          => 'es-419',
			'es_PE'          => 'es-419',
			'es_UY'          => 'es-419',
			'es_PR'          => 'es-419',
			'es_GT'          => 'es-419',
			'es_EC'          => 'es-419',
			'es_MX'          => 'es-419',
			'es_VE'          => 'es-419',
			'es_CR'          => 'es-419',
			'fi'             => 'fi-FI',
			'fr_FR'          => 'fr-FR',
			'he_IL'          => 'he-IL',
			'it_IT'          => 'it-IT',
			'ja'             => 'ja-JP',
			'nl_NL'          => 'nl-NL',
			'nb_NO'          => 'no-NO',
			'nn_NO'          => 'no-NO',
			'pt_BR'          => 'pt-BR',
			'sv_SE'          => 'sv-SE',
		];

		$preferred = isset( $stripe_locales[ $locale ] ) ? $stripe_locales[ $locale ] : 'en-US';
		return [ $preferred ];
	}

	/**
	 * Gets the customer's locale/language based on their setting or the site settings.
	 *
	 * @param object $user The user we're wanting to get the locale for.
	 * @return string The locale/language set in the user profile or the site itself.
	 */
	public function get_customer_locale( $user ) {
		// If we have a user, get their locale with a site fallback.
		return ( $user ) ? get_user_locale( $user->ID ) : get_locale();
	}

	/**
	 * Given a WC_Order or WC_Customer, returns an array representing a Stripe customer object.
	 * At least one parameter has to not be null.
	 *
	 * @param WC_Order|null    $wc_order    The Woo order to parse.
	 * @param WC_Customer|null $wc_customer The Woo customer to parse.
	 *
	 * @return array Customer data.
	 */
	public static function map_customer_data( ?WC_Order $wc_order = null, ?WC_Customer $wc_customer = null ) {
		if ( null === $wc_customer && null === $wc_order ) {
			return [];
		}

		// Where available, the order data takes precedence over the customer.
		$object_to_parse = isset( $wc_order ) ? $wc_order : $wc_customer;
		$name            = $object_to_parse->get_billing_first_name() . ' ' . $object_to_parse->get_billing_last_name();
		$description     = '';
		if ( null !== $wc_customer && ! empty( $wc_customer->get_username() ) ) {
			// We have a logged in user, so add their username to the customer description.
			// translators: %1$s Name, %2$s Username.
			$description = sprintf( __( 'Name: %1$s, Username: %2$s', 'woocommerce-gateway-stripe' ), $name, $wc_customer->get_username() );
		} else {
			// Current user is not logged in.
			// translators: %1$s Name.
			$description = sprintf( __( 'Name: %1$s, Guest', 'woocommerce-gateway-stripe' ), $name );
		}

		$data = [
			'name'        => $name,
			'description' => $description,
			'email'       => $object_to_parse->get_billing_email(),
			'phone'       => $object_to_parse->get_billing_phone(),
			'address'     => [
				'line1'       => $object_to_parse->get_billing_address_1(),
				'line2'       => $object_to_parse->get_billing_address_2(),
				'postal_code' => $object_to_parse->get_billing_postcode(),
				'city'        => $object_to_parse->get_billing_city(),
				'state'       => $object_to_parse->get_billing_state(),
				'country'     => $object_to_parse->get_billing_country(),
			],
		];

		if ( ! empty( $object_to_parse->get_shipping_postcode() ) ) {
			$data['shipping'] = [
				'name'    => $object_to_parse->get_shipping_first_name() . ' ' . $object_to_parse->get_shipping_last_name(),
				'address' => [
					'line1'       => $object_to_parse->get_shipping_address_1(),
					'line2'       => $object_to_parse->get_shipping_address_2(),
					'postal_code' => $object_to_parse->get_shipping_postcode(),
					'city'        => $object_to_parse->get_shipping_city(),
					'state'       => $object_to_parse->get_shipping_state(),
					'country'     => $object_to_parse->get_shipping_country(),
				],
			];
		}

		return $data;
	}
}
