<?php
/**
 * Plugin Name:       Giftlight – Gift Guide & Gift Finder for WooCommerce
 * Plugin URI:        https://giftlight.app/
 * Description:       A gift guide and a gift finder quiz built from your own WooCommerce products: by who it's for, what to spend and what they're into.
 * Version:           1.0.1
 * Requires at least: 6.3
 * Requires PHP:      7.4
 * Requires Plugins:  woocommerce
 * Author:            Giftlight
 * License:           GPLv2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       giftlight
 * WC requires at least: 8.0
 *
 * @package Giftlight
 */

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

define( 'GIFTLIGHT_VERSION', '1.0.1' );
define( 'GIFTLIGHT_FILE', __FILE__ );
define( 'GIFTLIGHT_MAX_PRODUCTS', 300 );

add_action(
	'before_woocommerce_init',
	function () {
		if ( class_exists( '\Automattic\WooCommerce\Utilities\FeaturesUtil' ) ) {
			\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility( 'custom_order_tables', GIFTLIGHT_FILE, true );
			\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility( 'cart_checkout_blocks', GIFTLIGHT_FILE, true );
		}
	}
);

/**
 * Plain text from a WooCommerce name (they can hold HTML entities).
 *
 * @param string $s Name.
 * @return string
 */
function giftlight_text( $s ) {
	return trim( wp_strip_all_tags( html_entity_decode( (string) $s, ENT_QUOTES, 'UTF-8' ) ) );
}

/**
 * The catalog the gift guide is built from: products in stock, visible in the shop, with a photo and a price, in the
 * shop's own order, plus the product categories they sit in. Cached until a product or category changes.
 *
 * @return array{products: array, collections: array}
 */
function giftlight_catalog() {
	$cached = get_transient( 'giftlight_catalog' );
	if ( is_array( $cached ) && isset( $cached['products'] ) ) {
		return $cached;
	}
	$products = array();
	$used     = array();
	if ( function_exists( 'wc_get_products' ) ) {
		$items = wc_get_products(
			array(
				'status'       => 'publish',
				'visibility'   => 'catalog',
				'stock_status' => 'instock',
				'type'         => array( 'simple', 'variable', 'external' ),
				'limit'        => GIFTLIGHT_MAX_PRODUCTS,
				'orderby'      => 'menu_order',
				'order'        => 'ASC',
			)
		);
		$rank = 0;
		foreach ( $items as $p ) {
			$image_id = $p->get_image_id();
			if ( ! $image_id ) {
				continue;
			}
			$image = wp_get_attachment_image_url( $image_id, 'woocommerce_single' );
			if ( ! $image ) {
				$image = wp_get_attachment_image_url( $image_id, 'large' );
			}
			if ( ! $image ) {
				continue;
			}
			$price = (float) wc_get_price_to_display( $p );
			$vars  = array();
			if ( $p->is_type( 'variable' ) ) {
				$prices = $p->get_variation_prices( true );
				foreach ( $prices['price'] as $vid => $vprice ) {
					if ( (float) $vprice > 0 ) {
						$vars[] = array( (string) $vid, (float) $vprice );
					}
				}
				if ( $vars ) {
					$price = min( array_map( function ( $v ) { return $v[1]; }, $vars ) );
				}
			}
			if ( $price <= 0 ) {
				continue;
			}
			$cols = array_map( 'strval', $p->get_category_ids() );
			foreach ( $cols as $c ) {
				$used[ $c ] = true;
			}
			$tags = wc_get_product_terms( $p->get_id(), 'product_tag', array( 'fields' => 'names' ) );
			$item = array(
				'id'        => (string) $p->get_id(),
				'title'     => giftlight_text( $p->get_name() ),
				'url'       => get_permalink( $p->get_id() ),
				'image'     => $image,
				'price'     => $price,
				'variant'   => (string) $p->get_id(),
				'available' => true,
				'type'      => '',
				'tags'      => array_values( array_map( 'giftlight_text', is_array( $tags ) ? $tags : array() ) ),
				'cols'      => $cols,
				'rank'      => $rank++,
			);
			if ( count( $vars ) > 1 ) {
				$item['vars'] = $vars;
			}
			$products[] = $item;
		}
	}
	$collections = array();
	if ( $used ) {
		$terms = get_terms(
			array(
				'taxonomy'   => 'product_cat',
				'include'    => array_map( 'intval', array_keys( $used ) ),
				'hide_empty' => false,
			)
		);
		if ( ! is_wp_error( $terms ) ) {
			foreach ( $terms as $t ) {
				$collections[] = array(
					'id'    => (string) $t->term_id,
					'title' => giftlight_text( $t->name ),
				);
			}
		}
	}
	$catalog = array(
		'products'    => $products,
		'collections' => $collections,
	);
	set_transient( 'giftlight_catalog', $catalog, 12 * HOUR_IN_SECONDS );
	return $catalog;
}

/**
 * Forget the cached catalog, so the guide follows the shop's products.
 */
function giftlight_flush() {
	delete_transient( 'giftlight_catalog' );
}
foreach ( array( 'woocommerce_new_product', 'woocommerce_update_product', 'woocommerce_delete_product', 'woocommerce_trash_product', 'woocommerce_product_set_stock_status', 'woocommerce_variation_set_stock_status', 'woocommerce_update_product_variation', 'created_product_cat', 'edited_product_cat', 'delete_product_cat' ) as $giftlight_hook ) {
	add_action( $giftlight_hook, 'giftlight_flush' );
}
add_action(
	'save_post_product',
	'giftlight_flush'
);

/**
 * Register the storefront script and styles (loaded only on pages that show the guide).
 */
function giftlight_register_assets() {
	wp_register_script(
		'giftlight',
		plugins_url( 'assets/giftlight.js', GIFTLIGHT_FILE ),
		array(),
		GIFTLIGHT_VERSION,
		array(
			'in_footer' => true,
			'strategy'  => 'defer',
		)
	);
	wp_register_style( 'giftlight', plugins_url( 'assets/giftlight.css', GIFTLIGHT_FILE ), array(), GIFTLIGHT_VERSION );
}
add_action( 'init', 'giftlight_register_assets' );

/**
 * The gift guide (or quiz) as HTML: a holder with the catalog as JSON; assets/giftlight.js builds and shows it.
 *
 * @param array $atts layout (guide|quiz), title, intro.
 * @return string
 */
function giftlight_render( $atts = array() ) {
	if ( ! function_exists( 'wc_get_products' ) ) {
		return '';
	}
	$a = shortcode_atts(
		array(
			'layout' => get_option( 'giftlight_layout', 'guide' ),
			'title'  => '',
			'intro'  => '',
		),
		$atts,
		'giftlight'
	);
	$catalog = giftlight_catalog();
	wp_enqueue_script( 'giftlight' );
	wp_enqueue_style( 'giftlight' );
	$data = array(
		'products'    => $catalog['products'],
		'collections' => $catalog['collections'],
		'currency'    => get_woocommerce_currency(),
		'owner'       => current_user_can( 'edit_pages' ),
	);
	$json = wp_json_encode( $data, JSON_HEX_TAG | JSON_HEX_AMP | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
	return sprintf(
		'<div class="giftlight" data-giftlight data-layout="%1$s"%2$s%3$s><script type="application/json">%4$s</script></div>',
		esc_attr( 'quiz' === $a['layout'] ? 'quiz' : 'guide' ),
		'' !== $a['title'] ? ' data-title="' . esc_attr( $a['title'] ) . '"' : '',
		'' !== $a['intro'] ? ' data-intro="' . esc_attr( $a['intro'] ) . '"' : '',
		$json // Escaped by wp_json_encode with JSON_HEX_TAG, so it can't close the script element.
	);
}
add_shortcode( 'giftlight', 'giftlight_render' );

/**
 * The block: "Gift guide" in the block inserter.
 */
function giftlight_register_block() {
	register_block_type( __DIR__ . '/blocks/gift-guide' );
}
add_action( 'init', 'giftlight_register_block' );

if ( is_admin() ) {
	require_once __DIR__ . '/admin.php';
}