<?php
/**
 * Admin bootstrap: menu, settings screen and admin assets.
 *
 * @package Bulkora\Admin
 */

namespace Bulkora\Admin;

use Bulkora\Catalog;
use Bulkora\Settings;

defined( 'ABSPATH' ) || exit;

/**
 * Registers the plugin settings screen and loads its assets only there.
 */
class Admin {

	/**
	 * Capability required to view or change anything.
	 */
	const CAPABILITY = 'manage_options';

	/**
	 * Settings page slug.
	 */
	const PAGE_SETTINGS = 'bulkora-settings';

	/**
	 * Option group used by the WordPress Settings API.
	 */
	const OPTION_GROUP = 'bulkora_settings_group';

	/**
	 * Nonce action shared by every admin request.
	 */
	const NONCE_ACTION = 'bulkora_admin';

	/**
	 * Settings repository.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Catalog service.
	 *
	 * @var Catalog
	 */
	private $catalog;

	/**
	 * Constructor.
	 *
	 * @param Settings $settings Settings repository.
	 * @param Catalog  $catalog  Catalog service.
	 */
	public function __construct( Settings $settings, Catalog $catalog ) {
		$this->settings = $settings;
		$this->catalog  = $catalog;

		add_action( 'admin_menu', array( $this, 'register_menu' ) );
		add_action( 'admin_init', array( $this, 'register_settings' ) );
		add_action( 'admin_init', array( $this, 'maybe_redirect_after_activation' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ) );
		add_filter( 'admin_body_class', array( $this, 'body_class' ) );
	}

	/**
	 * Register the settings screen, nested under WooCommerce when available.
	 *
	 * @return void
	 */
	public function register_menu() {
		$title = __( 'Bulkora', 'bulkora-multiple-variation-order' );

		if ( class_exists( 'WooCommerce' ) ) {
			add_submenu_page(
				'woocommerce',
				__( 'Bulkora', 'bulkora-multiple-variation-order' ),
				$title,
				self::CAPABILITY,
				self::PAGE_SETTINGS,
				array( $this, 'render_settings' )
			);

			return;
		}

		add_menu_page(
			__( 'Bulkora', 'bulkora-multiple-variation-order' ),
			$title,
			self::CAPABILITY,
			self::PAGE_SETTINGS,
			array( $this, 'render_settings' ),
			'dashicons-cart',
			58.9
		);
	}

	/**
	 * Register the options with the Settings API.
	 *
	 * @return void
	 */
	public function register_settings() {
		register_setting(
			self::OPTION_GROUP,
			'bulkora_general',
			array(
				'type'              => 'array',
				'sanitize_callback' => array( $this, 'sanitize_general' ),
				'default'           => $this->settings->defaults( Settings::GROUP_GENERAL ),
			)
		);

		register_setting(
			self::OPTION_GROUP,
			'bulkora_advanced',
			array(
				'type'              => 'array',
				'sanitize_callback' => array( $this, 'sanitize_advanced' ),
				'default'           => $this->settings->defaults( Settings::GROUP_ADVANCED ),
			)
		);
	}

	/**
	 * Sanitise the general group.
	 *
	 * @param mixed $value Raw submitted value.
	 * @return array
	 */
	public function sanitize_general( $value ) {
		return $this->settings->sanitize_group( Settings::GROUP_GENERAL, (array) $value );
	}

	/**
	 * Sanitise the advanced group.
	 *
	 * @param mixed $value Raw submitted value.
	 * @return array
	 */
	public function sanitize_advanced( $value ) {
		return $this->settings->sanitize_group( Settings::GROUP_ADVANCED, (array) $value );
	}

	/**
	 * Load the settings assets, and only on the plugin's own screen.
	 *
	 * @param string $hook_suffix Current admin screen hook.
	 * @return void
	 */
	public function enqueue_assets( $hook_suffix ) {
		if ( ! $this->is_plugin_screen( $hook_suffix ) ) {
			return;
		}

		wp_enqueue_style(
			'bulkora-admin',
			BULKORA_ASSETS_URL . 'admin/css/admin.css',
			array(),
			\Bulkora\Plugin::asset_version( 'admin/css/admin.css' )
		);

		wp_enqueue_script(
			'bulkora-admin',
			BULKORA_ASSETS_URL . 'admin/js/admin.js',
			array(),
			\Bulkora\Plugin::asset_version( 'admin/js/admin.js' ),
			true
		);

		wp_localize_script(
			'bulkora-admin',
			'bulkoraAdmin',
			array(
				'ajaxUrl' => admin_url( 'admin-ajax.php' ),
				'nonce'   => wp_create_nonce( self::NONCE_ACTION ),
				'i18n'    => array(
					'saved'  => __( 'Changes saved.', 'bulkora-multiple-variation-order' ),
					'error'  => __( 'Something went wrong. Please try again.', 'bulkora-multiple-variation-order' ),
				),
			)
		);
	}

	/**
	 * Whether the current screen belongs to this plugin.
	 *
	 * @param string $hook_suffix Screen hook, or a screen id.
	 * @return bool
	 */
	private function is_plugin_screen( $hook_suffix ) {
		return false !== strpos( (string) $hook_suffix, self::PAGE_SETTINGS );
	}

	/**
	 * Tag the plugin screen so styles can be scoped safely.
	 *
	 * @param string $classes Existing body classes.
	 * @return string
	 */
	public function body_class( $classes ) {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;

		if ( $screen && $this->is_plugin_screen( $screen->id ) ) {
			$classes .= ' bulkora-screen';
		}

		return $classes;
	}

	/**
	 * Send a freshly activated user straight to the settings screen.
	 *
	 * @return void
	 */
	public function maybe_redirect_after_activation() {
		if ( ! get_transient( 'bulkora_activation_redirect' ) ) {
			return;
		}

		delete_transient( 'bulkora_activation_redirect' );

		if ( wp_doing_ajax() || is_network_admin() || ! current_user_can( self::CAPABILITY ) ) {
			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- presence check only.
		if ( isset( $_GET['activate-multi'] ) ) {
			return;
		}

		wp_safe_redirect( admin_url( 'admin.php?page=' . self::PAGE_SETTINGS ) );
		exit;
	}

	/**
	 * Render the settings screen.
	 *
	 * @return void
	 */
	public function render_settings() {
		$this->render_view( 'settings' );
	}

	/**
	 * Include a view with the shared template context.
	 *
	 * @param string $view View file name, without extension.
	 * @return void
	 */
	private function render_view( $view ) {
		if ( ! current_user_can( self::CAPABILITY ) ) {
			wp_die( esc_html__( 'You do not have permission to access this page.', 'bulkora-multiple-variation-order' ) );
		}

		$settings = $this->settings;
		$catalog  = $this->catalog;
		$admin    = $this;

		$path = __DIR__ . '/views/' . $view . '.php';

		if ( ! is_readable( $path ) ) {
			return;
		}

		include $path;
	}

	/**
	 * Admin URL for the settings screen.
	 *
	 * @return string
	 */
	public function url() {
		return admin_url( 'admin.php?page=' . self::PAGE_SETTINGS );
	}
}