<?php

/**
 * Renders {{variable}} placeholders in step fields.
 *
 * @package AfroIT_Messaging_WorkflowAutomations
 */

namespace AfroIT\Messaging\WorkflowAutomations\ExecutionEngine;

use AfroIT\Messaging\WorkflowAutomations\WooCommerce\AbandonedOrder;
use AfroIT\Messaging\WorkflowAutomations\WooCommerce\Variables;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class TemplateRenderer
 */
final class TemplateRenderer {

	/**
	 * Recursively render strings in a nested value.
	 *
	 * @param mixed                $value   Value.
	 * @param array<string, mixed> $context Context.
	 * @return mixed
	 */
	public static function render_step_metadata( $value, array $context ) {
		if ( is_string( $value ) ) {
			return self::render( $value, $context );
		}
		if ( is_array( $value ) ) {
			$out = array();
			foreach ( $value as $key => $item ) {
				$out[ $key ] = self::render_step_metadata( $item, $context );
			}
			return $out;
		}

		return $value;
	}

	/**
	 * Replace {{variable}} placeholders.
	 *
	 * @param string               $string  Template.
	 * @param array<string, mixed> $context Context.
	 * @return string
	 */
	public static function render( string $string, array $context ): string {
		if ( '' === $string || false === strpos( $string, '{{' ) ) {
			return $string;
		}

		if ( ! preg_match_all( '/\{\{([a-zA-Z0-9_]+)\}\}/', $string, $matches ) ) {
			return $string;
		}

		$order     = self::order_from_context( $context );
		$variables = null !== $order ? Variables::fromOrderInstance( $order ) : null;

		foreach ( $matches[0] as $i => $placeholder ) {
			$key   = $matches[1][ $i ];
			$value = $placeholder;

			if ( null !== $variables ) {
				$resolved = $variables->get( $placeholder );
				if ( is_scalar( $resolved ) && (string) $resolved !== $placeholder ) {
					$value = (string) $resolved;
				}
			}

			if ( $value === $placeholder ) {
				$order_snap = isset( $context['order'] ) && is_array( $context['order'] ) ? $context['order'] : array();
				if ( isset( $order_snap[ $key ] ) && is_scalar( $order_snap[ $key ] ) ) {
					$value = (string) $order_snap[ $key ];
				} elseif ( isset( $context[ $key ] ) && is_scalar( $context[ $key ] ) ) {
					$value = (string) $context[ $key ];
				}
			}

			$string = str_replace( $placeholder, $value, $string );
		}

		return $string;
	}

	/**
	 * @param array<string, mixed> $context Context.
	 * @return \WC_Order|AbandonedOrder|null
	 */
	private static function order_from_context( array $context ) {
		$order_id = isset( $context['order_id'] ) ? absint( $context['order_id'] ) : 0;
		if ( $order_id > 0 && function_exists( 'wc_get_order' ) ) {
			$order = wc_get_order( $order_id );
			if ( $order instanceof \WC_Order ) {
				return $order;
			}
		}

		$abandoned_cart_id = isset( $context['abandoned_cart_id'] ) ? absint( $context['abandoned_cart_id'] ) : 0;
		if ( $abandoned_cart_id > 0 ) {
			$order = new AbandonedOrder( $abandoned_cart_id );
			if ( ! empty( $order->get_cart_data() ) ) {
				return $order;
			}
		}

		return null;
	}
}