<?php
/**
 * A helper for mapping the old/new settings tab settings.
 *
 * @package WooCommerce\PayPalCommerce\Compat\Settings
 */

declare(strict_types=1);

namespace WooCommerce\PayPalCommerce\Compat\Settings;

use WooCommerce\PayPalCommerce\ApiClient\Entity\ApplicationContext;
use WooCommerce\PayPalCommerce\ApiClient\Helper\PurchaseUnitSanitizer;
use WooCommerce\PayPalCommerce\Button\Helper\ContextTrait;

/**
 * A map of old to new styling settings.
 *
 * @psalm-import-type newSettingsKey from SettingsMap
 * @psalm-import-type oldSettingsKey from SettingsMap
 */
class SettingsTabMapHelper {

	use ContextTrait;

	/**
	 * Maps old setting keys to new setting keys.
	 *
	 * @psalm-return array<oldSettingsKey, newSettingsKey>
	 */
	public function map(): array {
		return array(
			'disable_cards'              => 'disabled_cards',
			'brand_name'                 => 'brand_name',
			'soft_descriptor'            => 'soft_descriptor',
			'payee_preferred'            => 'instant_payments_only',
			'subtotal_mismatch_behavior' => 'subtotal_adjustment',
			'landing_page'               => 'landing_page',
			'smart_button_language'      => 'button_language',
			'prefix'                     => 'invoice_prefix',
			'intent'                     => '',
			'vault_enabled'              => 'save_paypal_and_venmo',
		);
	}

	/**
	 * Retrieves the value of a mapped key from the new settings.
	 *
	 * @param string                      $old_key The key from the legacy settings.
	 * @param array<string, scalar|array> $settings_model The new settings model data as an array.
	 * @return mixed The value of the mapped setting, (null if not found).
	 */
	public function mapped_value( string $old_key, array $settings_model ) {
		$settings_map = $this->map();
		$new_key      = $settings_map[ $old_key ] ?? false;
		switch ( $old_key ) {
			case 'subtotal_mismatch_behavior':
				return $this->mapped_mismatch_behavior_value( $settings_model );

			case 'landing_page':
				return $this->mapped_landing_page_value( $settings_model );

			case 'intent':
				return $this->mapped_intent_value( $settings_model );

			default:
				return $settings_model[ $new_key ] ?? null;
		}
	}

	/**
	 * Retrieves the mapped value for the 'mismatch_behavior' from the new settings.
	 *
	 * @param array<string, scalar|array> $settings_model The new settings model data as an array.
	 * @return 'extra_line'|'ditch'|null The mapped 'mismatch_behavior' setting value.
	 */
	protected function mapped_mismatch_behavior_value( array $settings_model ): ?string {
		$subtotal_adjustment = $settings_model['subtotal_adjustment'] ?? false;

		if ( ! $subtotal_adjustment ) {
			return null;
		}

		return $subtotal_adjustment === 'correction' ? PurchaseUnitSanitizer::MODE_EXTRA_LINE : PurchaseUnitSanitizer::MODE_DITCH;
	}

	/**
	 * Retrieves the mapped value for the 'landing_page' from the new settings.
	 *
	 * @param array<string, scalar|array> $settings_model The new settings model data as an array.
	 * @return 'LOGIN'|'BILLING'|'NO_PREFERENCE'|null The mapped 'landing_page' setting value.
	 */
	protected function mapped_landing_page_value( array $settings_model ): ?string {
		$landing_page = $settings_model['landing_page'] ?? false;

		if ( ! $landing_page ) {
			return null;
		}

		return $landing_page === 'login'
			? ApplicationContext::LANDING_PAGE_LOGIN
			: ( $landing_page === 'guest_checkout'
				? ApplicationContext::LANDING_PAGE_BILLING
				: ApplicationContext::LANDING_PAGE_NO_PREFERENCE
			);
	}

	/**
	 * Retrieves the mapped value for the order intent from the new settings.
	 *
	 * @param array<string, scalar|array> $settings_model The new settings model data as an array.
	 * @return 'AUTHORIZE'|'CAPTURE'|null The mapped 'intent' setting value.
	 */
	protected function mapped_intent_value( array $settings_model ): ?string {
		$authorize_only         = $settings_model['authorize_only'] ?? null;
		$capture_virtual_orders = $settings_model['capture_virtual_orders'] ?? null;

		if ( is_null( $authorize_only ) && is_null( $capture_virtual_orders ) ) {
			return null;
		}

		return $authorize_only ? 'AUTHORIZE' : 'CAPTURE';
	}
}