<?php

namespace Alexr\Whatsapp;

use Alexr\Models\Restaurant;
use Alexr\Whatsapp\BookNowWidgetResolver;

/**
 * Centralizes restaurant-level variable resolution for WhatsApp templates and SMS messages.
 *
 * Used by:
 * - WhatsappKeywordHandler (auto-reply templates and custom messages)
 * - MissedCallService (missed call WhatsApp and SMS)
 * - Any future caller that needs to resolve restaurant-level template variables
 *
 * For booking-level variables (name, date, time, etc.), see MapBookingFieldsToWhatsapp trait.
 */
class RestaurantVariableResolver
{
	/**
	 * Resolve field_mapping variables for WhatsApp templates (restaurant-level only).
	 *
	 * @param array $fieldMapping Template variable mapping: ['{{1}}' => 'restaurant', '{{2}}' => 'book_now', ...]
	 * @param Restaurant $restaurant
	 * @param string|null $bookNowWidgetId Widget ID for book_now URL
	 * @param array $bookNowExtraParams Extra params for evavel_action_book_now (e.g. ['missed_call' => 1])
	 * @param string|null $bookNowOverride Pre-generated URL that replaces the call to evavel_action_book_now
	 * @return array ['field_key' => 'resolved_value', ...]
	 */
	public static function resolveVariables(
		array $fieldMapping,
		Restaurant $restaurant,
		$bookNowWidgetId = null,
		array $bookNowExtraParams = [],
		?string $bookNowOverride = null,
		array $staticValues = []
	): array {

		$bookNowUrl = $bookNowOverride ?? self::getBookNowUrl($restaurant, $bookNowWidgetId, $bookNowExtraParams);

		$variables = [];

		foreach ($fieldMapping as $templateVar => $fieldKey) {
			if (empty($fieldKey)) {
				continue;
			}

			// If mapped to custom_link, use the static value
			if ($fieldKey === 'custom_link') {
				$staticValue = $staticValues[$templateVar] ?? '';
				if ($staticValue !== '') {
					$variables[$templateVar] = (string) $staticValue;
				}
				continue;
			}

			$value = self::resolveField($fieldKey, $restaurant, $bookNowUrl);

			if ($value !== null && $value !== '') {
				$variables[$templateVar] = (string) $value;
			}
		}

		return $variables;
	}

	/**
	 * Replace {tag} placeholders in a text message with restaurant values.
	 * Used by WhatsApp custom messages and SMS.
	 *
	 * @param string $message Message with {restaurant}, {book_now}, etc. placeholders
	 * @param Restaurant $restaurant
	 * @param string|null $bookNowWidgetId Widget ID for book_now URL
	 * @param array $bookNowExtraParams Extra params for evavel_action_book_now
	 * @param string|null $bookNowOverride Pre-generated URL that replaces the call to evavel_action_book_now
	 * @return string Message with placeholders replaced
	 */
	public static function replaceTags(
		string $message,
		Restaurant $restaurant,
		$bookNowWidgetId = null,
		array $bookNowExtraParams = [],
		?string $bookNowOverride = null
	): string {

		$bookNowUrl = $bookNowOverride ?? self::getBookNowUrl($restaurant, $bookNowWidgetId, $bookNowExtraParams);

		$dialCode = $restaurant->dial_code ?? '';
		$phone = $restaurant->phone ?? '';
		$timezone = $restaurant->timezone ?? 'UTC';

		$replacements = [
			'{restaurant}'           => $restaurant->name ?? '',
			'{restaurant_phone}'     => trim($dialCode . ' ' . $phone),
			'{book_now}'             => $bookNowUrl,
			'{current_date}'         => evavel_now_timezone_formatted($timezone, 'Y-m-d'),
			'{site_link}'            => evavel_site_url(),
			'{restaurant_link}'      => $restaurant->link_web ?? '',
			'{restaurant_facebook}'  => $restaurant->link_facebook ?? '',
			'{restaurant_instagram}' => $restaurant->link_instagram ?? '',
			'{menu_link}'            => $restaurant->link_menu ?? '',
			'{opening_link}'         => $restaurant->link_opening ?? '',
		];

		return str_replace(
			array_keys($replacements),
			array_values($replacements),
			$message
		);
	}

	/**
	 * Generate a book_now URL.
	 * Centralizes the call to evavel_action_book_now().
	 *
	 * @param Restaurant $restaurant
	 * @param string|null $bookNowWidgetId
	 * @param array $extraParams Extra params like ['missed_call' => 1, 'utm_source' => 'sms']
	 * @return string
	 */
	public static function getBookNowUrl(Restaurant $restaurant, $bookNowWidgetId = null, array $extraParams = []): string
	{
		// If no widget_id passed explicitly, resolve from centralized setting
		if ($bookNowWidgetId === null) {
			$bookNowWidgetId = BookNowWidgetResolver::resolve($restaurant->id);
		}
		return evavel_action_book_now($restaurant->id, $bookNowWidgetId, $extraParams);
	}

	/**
	 * Resolve a single restaurant-level field value.
	 *
	 * @param string $fieldKey
	 * @param Restaurant $restaurant
	 * @param string $bookNowUrl Pre-resolved book_now URL
	 * @return string
	 */
	protected static function resolveField(string $fieldKey, Restaurant $restaurant, string $bookNowUrl): string
	{
		switch ($fieldKey) {
			case 'restaurant':
				return $restaurant->name ?? '';

			case 'restaurant_phone':
				$dialCode = $restaurant->dial_code ?? '';
				$phone = $restaurant->phone ?? '';
				return trim($dialCode . ' ' . $phone);

			case 'book_now':
				return $bookNowUrl;

			case 'current_date':
				$timezone = $restaurant->timezone ?? 'UTC';
				return evavel_now_timezone_formatted($timezone, 'Y-m-d');

			case 'site_link':
				return evavel_site_url();

			case 'restaurant_link':
				return $restaurant->link_web ?? '';

			case 'restaurant_facebook':
				return $restaurant->link_facebook ?? '';

			case 'restaurant_instagram':
				return $restaurant->link_instagram ?? '';

			case 'menu_link':
				return $restaurant->link_menu ?? '';

			case 'opening_link':
				return $restaurant->link_opening ?? '';

			default:
				return '';
		}
	}
}