<?php
/**
 * WooCommerce storefront controls for online/offline mode.
 *
 * @package ABCTransferSmartOrders
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Storefront control class.
 */
class ABCT_Storefront_Control {
	/**
	 * Status manager.
	 *
	 * @var ABCT_Store_Status_Manager
	 */
	private $status_manager;

	/**
	 * Constructor.
	 *
	 * @param ABCT_Store_Status_Manager $status_manager Status manager.
	 */
	public function __construct( ABCT_Store_Status_Manager $status_manager ) {
		$this->status_manager = $status_manager;
	}

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public function register() {
		add_filter( 'woocommerce_is_purchasable', array( $this, 'filter_is_purchasable' ), 10, 2 );
		add_filter( 'woocommerce_variation_is_purchasable', array( $this, 'filter_variation_is_purchasable' ), 10, 2 );
		add_filter( 'woocommerce_add_to_cart_validation', array( $this, 'filter_add_to_cart_validation' ), 10, 5 );
		add_action( 'woocommerce_checkout_process', array( $this, 'validate_checkout_process' ) );
		add_action( 'woocommerce_after_checkout_validation', array( $this, 'validate_checkout_after_validation' ), 10, 2 );
		add_filter( 'woocommerce_product_single_add_to_cart_text', array( $this, 'filter_add_to_cart_text' ) );
		add_filter( 'woocommerce_product_add_to_cart_text', array( $this, 'filter_add_to_cart_text' ) );
		add_filter( 'woocommerce_add_to_cart_url', array( $this, 'filter_add_to_cart_url' ), 10, 2 );
		add_action( 'woocommerce_single_product_summary', array( $this, 'render_single_product_closed_message' ), 4 );
		add_action( 'template_redirect', array( $this, 'maybe_redirect_checkout_when_offline' ), 20 );
		add_action( 'wp_footer', array( $this, 'render_live_status_script' ), 99 );
	}

	/**
	 * Filter purchasability when store is offline.
	 *
	 * @param bool       $is_purchasable Purchasable flag.
	 * @param WC_Product $product Product object.
	 * @return bool
	 */
	public function filter_is_purchasable( $is_purchasable, $product ) {
		unset( $product );
		if ( ! $is_purchasable ) {
			return false;
		}

		return $this->status_manager->is_online();
	}

	/**
	 * Variation purchasability mirror filter.
	 *
	 * @param bool       $is_purchasable Purchasable flag.
	 * @param WC_Product $variation Variation object.
	 * @return bool
	 */
	public function filter_variation_is_purchasable( $is_purchasable, $variation ) {
		return $this->filter_is_purchasable( $is_purchasable, $variation );
	}

	/**
	 * Validate add-to-cart requests while offline.
	 *
	 * @param bool       $passed Validation state.
	 * @param int        $product_id Product ID.
	 * @param int        $quantity Quantity.
	 * @param int        $variation_id Variation ID.
	 * @param array<int|string,mixed> $variations Variation data.
	 * @return bool
	 */
	public function filter_add_to_cart_validation( $passed, $product_id, $quantity, $variation_id = 0, $variations = array() ) {
		unset( $product_id, $quantity, $variation_id, $variations );
		if ( ! $passed ) {
			return false;
		}

		if ( $this->status_manager->is_online() ) {
			return true;
		}

		$message = $this->status_manager->get_closed_message();
		if ( '' !== $message && function_exists( 'wc_add_notice' ) ) {
			wc_add_notice( $message, 'error' );
		}

		return false;
	}

	/**
	 * Checkout validation.
	 *
	 * @return void
	 */
	public function validate_checkout_process() {
		if ( $this->status_manager->is_online() ) {
			return;
		}

		$message = $this->status_manager->get_closed_message();
		if ( '' !== $message && function_exists( 'wc_add_notice' ) ) {
			wc_add_notice( $message, 'error' );
		}
	}

	/**
	 * Checkout validation errors.
	 *
	 * @param array<string,mixed> $data Posted data.
	 * @param WP_Error            $errors Error object.
	 * @return void
	 */
	public function validate_checkout_after_validation( $data, $errors ) {
		unset( $data );
		if ( $this->status_manager->is_online() ) {
			return;
		}

		$message = $this->status_manager->get_closed_message();
		if ( '' !== $message && $errors instanceof WP_Error ) {
			$errors->add( 'abct_store_closed', $message );
		}
	}

	/**
	 * Replace add-to-cart label when offline.
	 *
	 * @param string $text Current text.
	 * @return string
	 */
	public function filter_add_to_cart_text( $text ) {
		if ( $this->status_manager->is_online() ) {
			return $text;
		}

		return __( 'Store closed', 'abct-smart-orders' );
	}

	/**
	 * Redirect loop add-to-cart links to product page when offline.
	 *
	 * @param string     $url URL.
	 * @param WC_Product $product Product.
	 * @return string
	 */
	public function filter_add_to_cart_url( $url, $product ) {
		if ( $this->status_manager->is_online() ) {
			return $url;
		}

		if ( is_object( $product ) && method_exists( $product, 'get_id' ) ) {
			return get_permalink( $product->get_id() );
		}

		return $url;
	}

	/**
	 * Render closed message on product pages.
	 *
	 * @return void
	 */
	public function render_single_product_closed_message() {
		if ( $this->status_manager->is_online() ) {
			return;
		}

		if ( method_exists( $this->status_manager, 'should_show_closed_message' ) && ! $this->status_manager->should_show_closed_message() ) {
			return;
		}

		$message = $this->status_manager->get_closed_message();
		if ( '' === $message ) {
			return;
		}

		echo '<div class="woocommerce-info abct-closed-message">' . esc_html( $message ) . '</div>';
	}

	/**
	 * Prevent checkout completion flow while offline.
	 *
	 * @return void
	 */
	public function maybe_redirect_checkout_when_offline() {
		$is_order_received = function_exists( 'is_wc_endpoint_url' ) && is_wc_endpoint_url( 'order-received' );
		if ( ! function_exists( 'is_checkout' ) || ! is_checkout() || $is_order_received ) {
			return;
		}

		if ( $this->status_manager->is_online() ) {
			return;
		}

		$message = $this->status_manager->get_closed_message();
		if ( '' !== $message && function_exists( 'wc_add_notice' ) ) {
			wc_add_notice( $message, 'error' );
		}

		if ( function_exists( 'wc_get_cart_url' ) ) {
			wp_safe_redirect( wc_get_cart_url() );
			exit;
		}
	}

	/**
	 * Render lightweight status polling script.
	 *
	 * @return void
	 */
	public function render_live_status_script() {
		if ( ! function_exists( 'is_woocommerce' ) ) {
			return;
		}

		if ( ! ( is_woocommerce() || ( function_exists( 'is_cart' ) && is_cart() ) || ( function_exists( 'is_checkout' ) && is_checkout() ) || ( function_exists( 'is_product' ) && is_product() ) ) ) {
			return;
		}
		$interval_ms = max( 5000, absint( apply_filters( 'abct_store_status_poll_interval_ms', 10000 ) ) );
		?>
		<script>
		(function () {
			if (window.__abctStoreStatusPollingLoaded) {
				return;
			}
			window.__abctStoreStatusPollingLoaded = true;

					var ajaxUrl = <?php echo wp_json_encode( admin_url( 'admin-ajax.php' ) ); ?>;
					var nonce = <?php echo wp_json_encode( wp_create_nonce( 'abct_store_status_nonce' ) ); ?>;
					var intervalMs = <?php echo wp_json_encode( $interval_ms ); ?>;
					var closedLabel = <?php echo wp_json_encode( __( 'Store closed', 'abct-smart-orders' ) ); ?>;

			function setOfflineUi(isOnline, message) {
				var buttons = document.querySelectorAll('.single_add_to_cart_button, .add_to_cart_button, button[name="add-to-cart"], input[name="add-to-cart"]');
				buttons.forEach(function (button) {
					if (!button.dataset.abctOriginalText) {
						button.dataset.abctOriginalText = button.tagName === 'INPUT' ? (button.value || '') : (button.textContent || '');
					}
						if (!isOnline) {
							button.disabled = true;
							if (button.tagName === 'INPUT') {
								button.value = closedLabel;
							} else {
								button.textContent = closedLabel;
							}
						if (message) {
							button.setAttribute('title', message);
						}
						return;
					}
					button.disabled = false;
					if (button.dataset.abctOriginalText) {
						if (button.tagName === 'INPUT') {
							button.value = button.dataset.abctOriginalText;
						} else {
							button.textContent = button.dataset.abctOriginalText;
						}
					}
					button.removeAttribute('title');
				});
			}

			function fetchStatus() {
				var payload = new URLSearchParams();
				payload.append('action', 'abct_get_store_state');
				payload.append('nonce', nonce);

				window.fetch(ajaxUrl, {
					method: 'POST',
					headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
					body: payload.toString(),
					credentials: 'same-origin'
				}).then(function (response) {
					return response.json();
				}).then(function (json) {
					if (!json || !json.success || !json.data || !json.data.state) {
						return;
					}
					var isOnline = String(json.data.state) === 'online';
					setOfflineUi(isOnline, (json.data.message || ''));
				}).catch(function () {
					return null;
				});
			}

			fetchStatus();
			window.setInterval(fetchStatus, intervalMs);
		})();
		</script>
		<?php
	}
}