<?php
/**
 * The bar on single product pages.
 *
 * @package StickyAddToCartBar
 */

namespace StickyAddToCartBar;

defined( 'ABSPATH' ) || exit;

/**
 * Decides where the bar shows, loads its files and prints it.
 */
class Frontend {

	/**
	 * Product the bar is printed for on this page.
	 *
	 * @var \WC_Product|null
	 */
	private static $product = null;

	/**
	 * Hooks.
	 */
	public static function init() {
		add_action( 'wp', array( __CLASS__, 'setup' ) );
	}

	/**
	 * Runs once WordPress knows which page is shown.
	 */
	public static function setup() {
		if ( ! is_product() || post_password_required() ) {
			return;
		}
		$product = wc_get_product( get_queried_object_id() );
		if ( ! $product || ! self::can_show_for( $product ) ) {
			return;
		}
		self::$product = $product;

		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'assets' ) );
		add_action( 'wp_footer', array( __CLASS__, 'render' ), 20 );

		// Storefront has its own sticky bar. One bar is enough.
		remove_action( 'storefront_after_footer', 'storefront_sticky_single_add_to_cart', 999 );
	}

	/**
	 * The product the bar is shown for on this page, if any.
	 *
	 * @return \WC_Product|null
	 */
	public static function product() {
		return self::$product;
	}

	/**
	 * Whether the bar shows for a product.
	 *
	 * @param \WC_Product $product Product.
	 * @return bool
	 */
	public static function can_show_for( $product ) {
		$s    = Settings::get();
		$show = $s['enabled']
			&& ( $s['desktop'] || $s['mobile'] )
			&& 'publish' === $product->get_status()
			&& ! Product_Settings::is_hidden( $product )
			&& self::can_buy( $product );

		/**
		 * Filters whether the bar shows on a product page.
		 *
		 * @param bool        $show    Whether to show it.
		 * @param \WC_Product $product Product.
		 */
		return (bool) apply_filters( 'satcbar_show_for_product', $show, $product );
	}

	/**
	 * Whether shoppers can buy the product from its page right now.
	 *
	 * @param \WC_Product $product Product.
	 * @return bool
	 */
	private static function can_buy( $product ) {
		if ( $product->is_type( 'external' ) ) {
			return '' !== (string) $product->get_product_url();
		}
		if ( $product->is_type( 'grouped' ) ) {
			foreach ( $product->get_children() as $child_id ) {
				$child = wc_get_product( $child_id );
				if ( $child && 'publish' === $child->get_status() && $child->is_purchasable() && $child->is_in_stock() ) {
					return true;
				}
			}
			return false;
		}
		return $product->is_purchasable() && $product->is_in_stock();
	}

	/**
	 * Loads the bar's CSS and JS (single product pages with a bar only).
	 */
	public static function assets() {
		$s = Settings::get();
		wp_enqueue_style( 'satcbar', SATCBAR_URL . 'assets/css/bar.css', array(), SATCBAR_VERSION );
		if ( $s['button_color'] ) {
			wp_add_inline_style( 'satcbar', '.satcbar{--satcbar-btn:' . $s['button_color'] . ';--satcbar-btn-text:' . Settings::text_color_for( $s['button_color'] ) . ';}' );
		}
		wp_enqueue_script(
			'satcbar',
			SATCBAR_URL . 'assets/js/bar.js',
			array(),
			SATCBAR_VERSION,
			array(
				'in_footer' => true,
				'strategy'  => 'defer',
			)
		);

		/**
		 * Fires after the bar's files are queued. Add-ons queue theirs here.
		 *
		 * @param \WC_Product $product Product.
		 */
		do_action( 'satcbar_enqueue_assets', self::$product );
	}

	/**
	 * Settings the bar's script needs.
	 *
	 * @param \WC_Product $product Product.
	 * @return array
	 */
	public static function config( $product ) {
		$s    = Settings::get();
		$type = $product->get_type();
		if ( ! in_array( $type, array( 'simple', 'variable', 'grouped', 'external' ), true ) ) {
			$type = 'other';
		}
		$config = array(
			'id'       => $product->get_id(),
			'type'     => $type,
			'trigger'  => $s['trigger'],
			'position' => $s['position'],
			'text'     => array(
				'add'         => self::button_text( $product ),
				'choose'      => __( 'Choose options', 'cartpin' ),
				'chooseItems' => __( 'Choose items', 'cartpin' ),
				'outOfStock'  => __( 'Out of stock', 'cartpin' ),
				'unavailable' => __( 'Unavailable', 'cartpin' ),
			),
			/**
			 * Filters fixed bars at the bottom of the screen that the sticky bar sits above (CSS selectors).
			 *
			 * @param string[] $selectors Selectors.
			 */
			'avoid'    => array_values( (array) apply_filters( 'satcbar_bottom_avoid', array( '.storefront-handheld-footer-bar' ) ) ),
		);

		/**
		 * Filters the settings passed to the bar's script.
		 *
		 * @param array       $config  Settings.
		 * @param \WC_Product $product Product.
		 */
		return apply_filters( 'satcbar_bar_config', $config, $product );
	}

	/**
	 * Text on the bar's button.
	 *
	 * @param \WC_Product $product Product.
	 * @return string
	 */
	public static function button_text( $product ) {
		$s = Settings::get();
		if ( '' !== $s['button_text'] && ! $product->is_type( 'external' ) ) {
			return $s['button_text'];
		}
		return wp_strip_all_tags( $product->single_add_to_cart_text() );
	}

	/**
	 * CSS classes of the bar.
	 *
	 * @param array $s Settings.
	 * @return string[]
	 */
	public static function classes( array $s ) {
		$classes = array( 'satcbar', 'satcbar--' . $s['position'], 'satcbar--' . $s['style'] );
		if ( ! $s['desktop'] ) {
			$classes[] = 'satcbar--no-desktop';
		}
		if ( ! $s['mobile'] ) {
			$classes[] = 'satcbar--no-mobile';
		}
		$classes[] = $s['button_color'] ? 'satcbar--own-button' : 'satcbar--theme-button';

		/**
		 * Filters the bar's CSS classes.
		 *
		 * @param string[] $classes Classes.
		 * @param array    $s       Settings.
		 */
		return array_map( 'sanitize_html_class', (array) apply_filters( 'satcbar_bar_classes', $classes, $s ) );
	}

	/**
	 * Prints the bar (hidden until the shopper scrolls past the real button).
	 */
	public static function render() {
		$product = self::$product;
		if ( ! $product ) {
			return;
		}
		$s         = Settings::get();
		$show_qty  = $s['show_qty'] && in_array( $product->get_type(), array( 'simple', 'variable' ), true ) && ! $product->is_sold_individually();
		$image_id  = $product->get_image_id();
		$btn_class = $s['button_color'] ? 'satcbar__button' : 'satcbar__button button alt wp-element-button';
		$min       = max( 1, (int) $product->get_min_purchase_quantity() );
		$max       = (int) $product->get_max_purchase_quantity();
		?>
		<div id="satcbar" class="<?php echo esc_attr( implode( ' ', self::classes( $s ) ) ); ?>" role="region" aria-label="<?php esc_attr_e( 'Quick add to cart', 'cartpin' ); ?>" aria-hidden="true" inert data-satcbar="<?php echo esc_attr( (string) wp_json_encode( self::config( $product ) ) ); ?>">
			<div class="satcbar__inner">
				<div class="satcbar__product">
					<?php
					if ( $s['show_image'] && $image_id ) {
						echo wp_get_attachment_image(
							$image_id,
							'woocommerce_gallery_thumbnail',
							false,
							array(
								'class'              => 'satcbar__image',
								'alt'                => '',
								'loading'            => 'lazy',
								'data-satcbar-image' => '1',
							)
						);
					}
					?>
					<div class="satcbar__info">
						<div class="satcbar__name"><?php echo esc_html( wp_strip_all_tags( $product->get_name() ) ); ?></div>
						<?php if ( $s['show_price'] ) : ?>
							<div class="satcbar__price" data-satcbar-price><?php echo wp_kses_post( $product->get_price_html() ); ?></div>
						<?php endif; ?>
						<?php
						/**
						 * Prints extra details under the price (rating, badges…).
						 *
						 * @param \WC_Product $product Product.
						 */
						do_action( 'satcbar_bar_info_after', $product );
						?>
					</div>
				</div>
				<div class="satcbar__actions">
					<?php
					/**
					 * Prints controls before the quantity box (option pickers…).
					 *
					 * @param \WC_Product $product Product.
					 */
					do_action( 'satcbar_bar_actions_before', $product );
					?>
					<?php if ( $show_qty ) : ?>
						<div class="satcbar__qty" data-satcbar-qty-wrap>
							<button type="button" class="satcbar__step" data-satcbar-step="-1" aria-label="<?php esc_attr_e( 'Fewer', 'cartpin' ); ?>">&minus;</button>
							<input type="number" class="satcbar__qty-input" data-satcbar-qty value="<?php echo esc_attr( (string) $min ); ?>" min="<?php echo esc_attr( (string) $min ); ?>"<?php echo $max > 0 ? ' max="' . esc_attr( (string) $max ) . '"' : ''; ?> step="1" inputmode="numeric" aria-label="<?php esc_attr_e( 'Quantity', 'cartpin' ); ?>">
							<button type="button" class="satcbar__step" data-satcbar-step="1" aria-label="<?php esc_attr_e( 'More', 'cartpin' ); ?>">+</button>
						</div>
					<?php endif; ?>
					<button type="button" class="<?php echo esc_attr( $btn_class ); ?>" data-satcbar-button><?php echo esc_html( self::button_text( $product ) ); ?></button>
					<?php
					/**
					 * Prints controls after the bar's button (Buy now…).
					 *
					 * @param \WC_Product $product Product.
					 */
					do_action( 'satcbar_bar_actions_after', $product );
					?>
				</div>
			</div>
		</div>
		<?php
	}
}