<?php
/**
 * Server-authoritative pricing and progressive commerce UI.
 *
 * @package Objeka_Toolkit
 */

defined( 'ABSPATH' ) || exit;

/** Provides the conversion engine integration. */
final class Objeka_Toolkit_Conversion_Engine {
	/**
	 * Register WordPress integration hooks.
	 */
	public static function init() {
		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'assets' ) );
		add_action( 'woocommerce_before_calculate_totals', array( __CLASS__, 'discounts' ), 20 );
		add_action( 'woocommerce_before_add_to_cart_button', array( __CLASS__, 'product_tools' ) );
		add_action( 'woocommerce_after_add_to_cart_form', array( __CLASS__, 'product_guides' ) );
		add_action( 'woocommerce_after_single_product_summary', array( __CLASS__, 'sticky' ), 8 );
		add_action( 'wp_footer', array( __CLASS__, 'drawer' ) );
		add_action( 'woocommerce_blocks_loaded', array( __CLASS__, 'extend_cart' ) );
	}

	/**
	 * Enqueue the standalone frontend assets and translated configuration.
	 */
	public static function assets() {
		if ( is_admin() ) {
			return;
		}
		wp_enqueue_style( 'objeka-toolkit', plugins_url( 'assets/css/toolkit.css', OBJEKA_TOOLKIT_FILE ), array(), OBJEKA_TOOLKIT_VERSION );
		wp_enqueue_script(
			'objeka-toolkit',
			plugins_url( 'assets/js/toolkit.js', OBJEKA_TOOLKIT_FILE ),
			array(),
			OBJEKA_TOOLKIT_VERSION,
			array(
				'in_footer' => true,
				'strategy'  => 'defer',
			)
		);
		wp_localize_script(
			'objeka-toolkit',
			'objekaToolkit',
			array(
				'api'         => esc_url_raw( rest_url( 'wc/store/v1/' ) ),
				'cartUrl'     => wc_get_cart_url(),
				'checkoutUrl' => wc_get_checkout_url(),
				'currency'    => get_woocommerce_currency(),
				'locale'      => str_replace( '_', '-', get_locale() ),
				'i18n'        => array(
					'empty'    => __( 'Your bag is waiting for something good.', 'objeka-toolkit' ),
					'error'    => __( 'We could not update your bag. Please try again or open the cart page.', 'objeka-toolkit' ),
					'quantity' => __( 'Quantity', 'objeka-toolkit' ),
					'remove'   => __( 'Remove', 'objeka-toolkit' ),
					'add'      => __( 'Add to bag', 'objeka-toolkit' ),
					'added'    => __( 'Your bag has been updated.', 'objeka-toolkit' ),
					'expired'  => __( 'This countdown has ended.', 'objeka-toolkit' ),
					'qualify'  => __( 'Your subtotal meets this zone’s free shipping minimum. Confirm delivery options at checkout.', 'objeka-toolkit' ),
					/* translators: %s: formatted amount remaining to the configured shipping minimum. */
					'shipping' => __( '%s to this zone’s free shipping minimum.', 'objeka-toolkit' ),
					'bump'     => __( 'A considered addition', 'objeka-toolkit' ),
				),
			)
		);
	}

	/**
	 * Calculate volume prices from the stored product price on every totals pass.
	 *
	 * @param WC_Cart $cart Cart being recalculated.
	 */
	public static function discounts( $cart ) {
		if ( is_admin() && ! wp_doing_ajax() ) {
			return;
		}
		foreach ( $cart->get_cart() as $item ) {
			$product = $item['data'];
			$parent  = $product->get_parent_id() ? wc_get_product( $product->get_parent_id() ) : $product;
			if ( ! $parent || 'yes' !== $parent->get_meta( '_objeka_bundles' ) || $product->is_sold_individually() ) {
				continue;
			}
			$stored = wc_get_product( $product->get_id() );
			if ( ! $stored ) {
				continue;
			}
			$quantity = (int) $item['quantity'];
			$factor   = $quantity >= 3 ? 0.75 : ( $quantity >= 2 ? 0.85 : 1 );
			$product->set_price( (float) $stored->get_price( 'edit' ) * $factor );
		}
	}

	/**
	 * Render progressive enhancements inside the standard purchase form.
	 */
	public static function product_tools() {
		global $product;
		if ( ! $product || ! $product->is_purchasable() || ! $product->is_in_stock() || ! $product->is_type( array( 'simple', 'variable' ) ) ) {
			return;
		}
		include OBJEKA_TOOLKIT_DIR . 'templates/product-tools.php';
	}

	/** Render optional guides after the purchase control so they do not delay it. */
	public static function product_guides() {
		global $product;
		if ( $product ) {
			include OBJEKA_TOOLKIT_DIR . 'templates/product-guides.php';
		}
	}

	/**
	 * Render a purchase bar that JavaScript reveals only after the form leaves view.
	 */
	public static function sticky() {
		global $product;
		if ( ! $product || ! $product->is_purchasable() || ! $product->is_in_stock() || ! $product->is_type( array( 'simple', 'variable' ) ) ) {
			return;
		}
		?>
		<aside class="objeka-sticky" data-objeka-sticky hidden aria-label="<?php esc_attr_e( 'Quick purchase', 'objeka-toolkit' ); ?>">
			<span><?php echo esc_html( $product->get_name() ); ?></span>
			<span><?php echo wp_kses_post( $product->get_price_html() ); ?></span>
			<button type="button" data-objeka-buy><?php echo esc_html( $product->is_type( 'variable' ) ? __( 'Choose options', 'objeka-toolkit' ) : __( 'Add to bag', 'objeka-toolkit' ) ); ?></button>
		</aside>
		<?php
	}

	/**
	 * Render the accessible, session-backed cart dialog.
	 */
	public static function drawer() {
		if ( is_cart() || is_checkout() ) {
			return;
		}
		?>
		<dialog class="objeka-cart" data-objeka-cart aria-labelledby="objeka-cart-title">
			<div class="objeka-cart-head"><h2 id="objeka-cart-title"><?php esc_html_e( 'Your considered collection.', 'objeka-toolkit' ); ?></h2><button type="button" data-objeka-close aria-label="<?php esc_attr_e( 'Close bag', 'objeka-toolkit' ); ?>">×</button></div>
			<p data-objeka-status role="status" aria-live="polite"></p>
			<div data-objeka-shipping hidden><p></p><progress max="100" value="0" aria-label="<?php esc_attr_e( 'Progress to free shipping minimum', 'objeka-toolkit' ); ?>"></progress></div>
			<div data-objeka-items></div><div data-objeka-bump></div>
			<div class="objeka-cart-total"><span><?php esc_html_e( 'Total', 'objeka-toolkit' ); ?></span><strong data-objeka-total></strong></div>
			<p class="objeka-cart-note"><?php esc_html_e( 'Shipping and taxes are confirmed at checkout.', 'objeka-toolkit' ); ?></p>
			<a class="objeka-checkout" href="<?php echo esc_url( wc_get_checkout_url() ); ?>"><?php esc_html_e( 'Continue to checkout', 'objeka-toolkit' ); ?> ↗</a>
			<a href="<?php echo esc_url( wc_get_cart_url() ); ?>"><?php esc_html_e( 'View full cart', 'objeka-toolkit' ); ?></a>
		</dialog>
		<?php
	}

	/**
	 * Register shipping and upsell context in the official Store API.
	 */
	public static function extend_cart() {
		if ( ! function_exists( 'woocommerce_store_api_register_endpoint_data' ) ) {
			return;
		}
		woocommerce_store_api_register_endpoint_data(
			array(
				'endpoint'        => \Automattic\WooCommerce\StoreApi\Schemas\V1\CartSchema::IDENTIFIER,
				'namespace'       => 'objeka',
				'data_callback'   => array( __CLASS__, 'cart_context' ),
				'schema_callback' => static function () {
					return array(
						'shipping' => array(
							'description' => 'Shipping minimum for the current zone.',
							'type'        => array( 'object', 'null' ),
							'readonly'    => true,
							'properties'  => array(
								'minimum'  => array( 'type' => 'number' ),
								'subtotal' => array( 'type' => 'number' ),
							),
						),
						'bump'     => array(
							'description' => 'Optional explicitly selected product addition.',
							'type'        => array( 'object', 'null' ),
							'readonly'    => true,
							'properties'  => array(
								'id'    => array( 'type' => 'integer' ),
								'name'  => array( 'type' => 'string' ),
								'price' => array( 'type' => 'number' ),
							),
						),
					);
				},
				'schema_type'     => ARRAY_A,
			)
		);
	}

	/**
	 * Calculate honest shipping progress and the first eligible optional addition.
	 */
	public static function cart_context() {
		$context = array(
			'shipping' => null,
			'bump'     => null,
		);
		if ( ! WC()->cart ) {
			return $context;
		}
		$packages = WC()->cart->get_shipping_packages();
		// Multi-package eligibility cannot be represented by one honest progress bar.
		if ( 1 === count( $packages ) ) {
			$zone = WC_Shipping_Zones::get_zone_matching_package( reset( $packages ) );
			foreach ( $zone->get_shipping_methods( true ) as $method ) {
				if ( 'free_shipping' !== $method->id || 'min_amount' !== $method->get_option( 'requires' ) ) {
					continue;
				}
				$subtotal = WC()->cart->get_displayed_subtotal();
				if ( 'no' === $method->get_option( 'ignore_discounts', 'no' ) ) {
					$subtotal -= WC()->cart->get_discount_total();
					if ( WC()->cart->display_prices_including_tax() ) {
						$subtotal -= WC()->cart->get_discount_tax();
					}
				}
				$minimum = (float) $method->get_option( 'min_amount', 0 );
				if ( $minimum > 0 && ( null === $context['shipping'] || $minimum < $context['shipping']['minimum'] ) ) {
					$context['shipping'] = array(
						'minimum'  => $minimum,
						'subtotal' => max( 0, (float) $subtotal ),
					);
				}
			}
		}
		$in_cart = array_column( WC()->cart->get_cart(), 'product_id' );
		foreach ( WC()->cart->get_cart() as $item ) {
			$source = wc_get_product( $item['product_id'] );
			$bump   = $source ? wc_get_product( absint( $source->get_meta( '_objeka_bump_id' ) ) ) : false;
			if ( $bump && $bump->is_type( 'simple' ) && $bump->is_purchasable() && $bump->is_in_stock() && ! in_array( $bump->get_id(), $in_cart, true ) ) {
				$context['bump'] = array(
					'id'    => $bump->get_id(),
					'name'  => $bump->get_name(),
					'price' => (float) wc_get_price_to_display( $bump ),
				);
				break;
			}
		}
		return $context;
	}
}