<?php
/**
 * Settings: WooCommerce → Settings → Products → "Sold-out order".
 *
 * @package InStockFirst
 */

defined( 'ABSPATH' ) || exit;

/**
 * Settings section and option access.
 */
class INSTOCK_FIRST_Settings {

	const SECTION = 'instock_first';

	/**
	 * Option defaults. Everything useful is on by default, so the plugin works on activation.
	 *
	 * @return array<string,string>
	 */
	public static function defaults() {
		return array(
			'instock_first_enabled'    => 'yes',
			'instock_first_on_shop'    => 'yes',
			'instock_first_on_terms'   => 'yes',
			'instock_first_on_search'  => 'yes',
			'instock_first_on_short'   => 'yes',
			'instock_first_backorders' => 'instock', // instock | middle | last.
		);
	}

	/**
	 * Read an option with its default.
	 *
	 * @param string $key Option name.
	 * @return string
	 */
	public static function get( $key ) {
		$defaults = self::defaults();
		$value    = get_option( $key, isset( $defaults[ $key ] ) ? $defaults[ $key ] : '' );
		return is_string( $value ) ? $value : '';
	}

	/**
	 * @param string $key Option name.
	 * @return bool
	 */
	public static function is_on( $key ) {
		return 'yes' === self::get( $key );
	}

	/** Hook into WooCommerce settings. */
	public static function init() {
		add_filter( 'woocommerce_get_sections_products', array( __CLASS__, 'add_section' ) );
		add_filter( 'woocommerce_get_settings_products', array( __CLASS__, 'settings' ), 10, 2 );
	}

	/**
	 * @param array $sections Sections.
	 * @return array
	 */
	public static function add_section( $sections ) {
		$sections[ self::SECTION ] = __( 'Sold-out order', 'instock-first' );
		return $sections;
	}

	/**
	 * @param array  $settings Existing settings.
	 * @param string $section  Current section id.
	 * @return array
	 */
	public static function settings( $settings, $section ) {
		if ( self::SECTION !== $section ) {
			return $settings;
		}

		$d    = self::defaults();
		$desc = __( 'In-stock products are listed first and sold-out products move to the end. Your normal sorting (default, popularity, price, newest…) is kept inside each group. When a product is restocked it moves back up automatically. Nothing in your catalog is changed: the order is applied when the page is shown.', 'instock-first' );

		$out = array(
			array(
				'title' => __( 'Sold-out products last', 'instock-first' ),
				'type'  => 'title',
				'desc'  => $desc,
				'id'    => 'instock_first_options',
			),
			array(
				'title'   => __( 'Enable', 'instock-first' ),
				'desc'    => __( 'Move sold-out products to the end of product listings', 'instock-first' ),
				'id'      => 'instock_first_enabled',
				'type'    => 'checkbox',
				'default' => $d['instock_first_enabled'],
			),
			array(
				'title'         => __( 'Apply on', 'instock-first' ),
				'desc'          => __( 'Main shop page', 'instock-first' ),
				'id'            => 'instock_first_on_shop',
				'type'          => 'checkbox',
				'default'       => $d['instock_first_on_shop'],
				'checkboxgroup' => 'start',
			),
			array(
				'desc'          => __( 'Category, tag and attribute pages', 'instock-first' ),
				'id'            => 'instock_first_on_terms',
				'type'          => 'checkbox',
				'default'       => $d['instock_first_on_terms'],
				'checkboxgroup' => '',
			),
			array(
				'desc'          => __( 'Product search results', 'instock-first' ),
				'id'            => 'instock_first_on_search',
				'type'          => 'checkbox',
				'default'       => $d['instock_first_on_search'],
				'checkboxgroup' => '',
			),
			array(
				'desc'          => __( '[products] shortcode lists', 'instock-first' ),
				'id'            => 'instock_first_on_short',
				'type'          => 'checkbox',
				'default'       => $d['instock_first_on_short'],
				'checkboxgroup' => 'end',
			),
			array(
				'title'   => __( 'Backorder products', 'instock-first' ),
				'id'      => 'instock_first_backorders',
				'type'    => 'select',
				'default' => $d['instock_first_backorders'],
				'options' => array(
					'instock' => __( 'Treat as in stock', 'instock-first' ),
					'middle'  => __( 'After in-stock, before sold-out', 'instock-first' ),
					'last'    => __( 'Treat as sold out', 'instock-first' ),
				),
			),
			array(
				'type' => 'sectionend',
				'id'   => 'instock_first_options',
			),
		);

		return apply_filters( 'instock_first_settings', $out );
	}

	/** Shown when WooCommerce is not active. */
	public static function missing_woocommerce_notice() {
		if ( ! current_user_can( 'activate_plugins' ) ) {
			return;
		}
		echo '<div class="notice notice-warning"><p>' . esc_html__( 'InStock First needs WooCommerce to be installed and active.', 'instock-first' ) . '</p></div>';
	}
}