<?php
/**
 * Admin controller for NoorSMTP.
 *
 * Owns everything NoorSMTP puts inside wp-admin. Unified app shell architecture
 * matching NoorWork standards: single top-level page with responsive grouped
 * sidebar navigation, fast AJAX tab switching, and clean styling.
 *
 * @package NoorSMTP
 */

namespace NoorWork\NoorSMTP\Admin;

use NoorWork\NoorSMTP\Modules\ModuleManager;

defined( 'ABSPATH' ) || exit;

/**
 * Class SettingsPage
 */
class SettingsPage {

	const MENU_SLUG = 'noorsmtp';

	/**
	 * Module manager.
	 *
	 * @var ModuleManager
	 */
	private $modules;

	/**
	 * Assets controller.
	 *
	 * @var Assets
	 */
	private $assets;

	/**
	 * Constructor.
	 *
	 * @param ModuleManager $modules Module manager.
	 */
	public function __construct( ModuleManager $modules ) {
		$this->modules = $modules;
		$this->assets  = new Assets( $this );
	}

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public function register() {
		add_action( 'admin_menu', array( $this, 'add_menu' ) );
		add_action( 'admin_enqueue_scripts', array( $this->assets, 'enqueue' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'menu_badge_style' ) );
		add_action( 'wp_ajax_noorsmtp_render_tab', array( $this, 'ajax_render_tab' ) );
		add_filter( 'plugin_action_links_' . NOORSMTP_PLUGIN_BASENAME, array( $this, 'action_links' ) );
	}

	/**
	 * Register the top-level admin menu and its submenus.
	 *
	 * @return void
	 */
	public function add_menu() {
		$slug       = noorsmtp_menu_slug();
		$capability = noorsmtp_manage_capability();

		if ( ! noorsmtp_menu_registered() ) {
			add_menu_page(
				__( 'NoorSMTP', 'noorsmtp' ),
				__( 'NoorSMTP', 'noorsmtp' ),
				$capability,
				$slug,
				array( $this, 'render_app' ),
				'dashicons-email-alt',
				80
			);
		}

		$this->add_safe_submenu_page(
			$slug,
			__( 'Settings', 'noorsmtp' ),
			__( 'Settings', 'noorsmtp' ),
			$capability,
			$slug,
			array( $this, 'render_app' )
		);

		$this->add_safe_submenu_page(
			$slug,
			__( 'Test Email', 'noorsmtp' ),
			__( 'Test Email', 'noorsmtp' ),
			$capability,
			'noorsmtp-test',
			array( $this, 'render_app' )
		);

		$this->add_safe_submenu_page(
			$slug,
			__( 'Email Log', 'noorsmtp' ),
			__( 'Email Log', 'noorsmtp' ),
			$capability,
			'noorsmtp-log',
			array( $this, 'render_app' )
		);

		/**
		 * Fires after the core submenu pages are registered so extensions
		 * (e.g. NoorSMTP Pro) can add their own pages under the same menu.
		 *
		 * @since 1.2.0
		 * @param string $slug Top-level menu slug.
		 */
		do_action( 'noorsmtp_register_submenus', $slug );

		if ( ! noorsmtp_is_pro() || ! noorsmtp_license_active() ) {
			$this->add_safe_submenu_page(
				$slug,
				__( 'Upgrade to Pro', 'noorsmtp' ),
				'★ ' . __( 'Upgrade to Pro', 'noorsmtp' ),
				$capability,
				'noorsmtp-upgrade',
				array( $this, 'render_app' )
			);
		}
	}

	/**
	 * Safely add a submenu page without risking duplicates.
	 *
	 * @param string   $parent_slug Parent slug.
	 * @param string   $page_title  Page title.
	 * @param string   $menu_title  Menu title.
	 * @param string   $capability  Capability.
	 * @param string   $menu_slug   Menu slug.
	 * @param callable $callback    Optional callback.
	 * @param int      $position    Optional position.
	 * @return string|false
	 */
	public function add_safe_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $callback = null, $position = null ) {
		global $submenu;

		if ( isset( $submenu[ $parent_slug ] ) && is_array( $submenu[ $parent_slug ] ) ) {
			foreach ( $submenu[ $parent_slug ] as $item ) {
				if ( isset( $item[2] ) && $item[2] === $menu_slug ) {
					return false;
				}
			}
		}

		return add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $callback, $position );
	}

	/**
	 * Colour the "Upgrade Pro ★" submenu label without raw inline script/style tags in HTML.
	 *
	 * @return void
	 */
	public function menu_badge_style() {
		$css = '#adminmenu .toplevel_page_noorsmtp ul.wp-submenu a[href*="page=noorsmtp-upgrade"] {'
			. 'color: #10b981 !important;'
			. 'font-weight: 600 !important;'
			. '}'
			. '#adminmenu .toplevel_page_noorsmtp ul.wp-submenu a[href*="page=noorsmtp-upgrade"]:hover {'
			. 'color: #059669 !important;'
			. '}';
		wp_add_inline_style( 'common', $css );
	}

	/**
	 * Plugin action links on plugins.php.
	 *
	 * @param array $links Existing action links.
	 * @return array
	 */
	public function action_links( $links ) {
		$extra = array(
			'<a href="' . esc_url( noorsmtp_admin_url( self::MENU_SLUG ) ) . '">' . esc_html__( 'Settings', 'noorsmtp' ) . '</a>',
		);

		array_unshift( $links, ...$extra );

		return $links;
	}

	/**
	 * Current screen ID for the active request.
	 *
	 * @return string
	 */
	public function current_screen_id() {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$page = isset( $_GET['page'] ) ? sanitize_key( wp_unslash( $_GET['page'] ) ) : self::MENU_SLUG;

		return $page ? $page : self::MENU_SLUG;
	}

	/**
	 * Whether the current admin request is a NoorSMTP screen.
	 *
	 * @return bool
	 */
	public function is_noorsmtp_screen() {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;

		return $screen && false !== strpos( (string) $screen->id, 'noorsmtp' );
	}

	/**
	 * Navigation groups for the sidebar.
	 *
	 * @return array
	 */
	public function nav_groups() {
		global $submenu;

		$slug  = noorsmtp_menu_slug();
		$items = isset( $submenu[ $slug ] ) && is_array( $submenu[ $slug ] ) ? $submenu[ $slug ] : array();

		$groups = array(
			'config' => array(
				'label' => __( 'Configuration', 'noorsmtp' ),
				'items' => array(),
			),
			'tools'  => array(
				'label' => __( 'Tools & Logs', 'noorsmtp' ),
				'items' => array(),
			),
			'pro'    => array(
				'label' => __( 'Pro Features', 'noorsmtp' ),
				'items' => array(),
			),
		);

		$icons = array(
			self::MENU_SLUG         => 'dashicons-admin-generic',
			'noorsmtp-test'         => 'dashicons-email',
			'noorsmtp-log'          => 'dashicons-list-view',
			'noorsmtp-pro-features' => 'dashicons-star-filled',
			'noorsmtp-routing'      => 'dashicons-randomize',
			'noorsmtp-analytics'    => 'dashicons-chart-bar',
			'noorsmtp-dns'          => 'dashicons-shield',
			'noorsmtp-suppression'  => 'dashicons-shield-alt',
			'noorsmtp-license'      => 'dashicons-admin-network',
			'noorsmtp-upgrade'      => 'dashicons-star-empty',
		);

		foreach ( $items as $item ) {
			$item_slug  = $item[2];
			$item_title = wp_strip_all_tags( $item[0] );
			$item_icon  = isset( $icons[ $item_slug ] ) ? $icons[ $item_slug ] : 'dashicons-admin-generic';

			$entry = array(
				'slug'      => $item_slug,
				'title'     => $item_title,
				'menu_html' => $item[0],
				'icon'      => $item_icon,
			);

			if ( self::MENU_SLUG === $item_slug ) {
				$groups['config']['items'][] = $entry;
			} elseif ( in_array( $item_slug, array( 'noorsmtp-test', 'noorsmtp-log' ), true ) ) {
				$groups['tools']['items'][] = $entry;
			} elseif ( in_array( $item_slug, array( 'noorsmtp-pro-features', 'noorsmtp-routing', 'noorsmtp-analytics', 'noorsmtp-dns', 'noorsmtp-suppression', 'noorsmtp-license' ), true ) ) {
				$groups['pro']['items'][] = $entry;
			}
		}

		return array_filter(
			$groups,
			static function ( $group ) {
				return ! empty( $group['items'] );
			}
		);
	}

	/**
	 * Render the unified application shell.
	 *
	 * @return void
	 */
	public function render_app() {
		if ( ! noorsmtp_user_can_manage() ) {
			wp_die( esc_html__( 'You do not have permission to access NoorSMTP.', 'noorsmtp' ), 403 );
		}

		$current = $this->current_screen_id();
		$groups  = $this->nav_groups();
		$body    = $this->render_screen_body( $current );

		include NOORSMTP_PATH . 'src/Admin/views/page-header.php';
		// Body is escaped within its respective view templates.
		echo $body; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		include NOORSMTP_PATH . 'src/Admin/views/page-footer.php';
	}

	/**
	 * Render the inner body for a screen.
	 *
	 * @param string $screen_slug Screen slug.
	 * @return string
	 */
	public function render_screen_body( $screen_slug ) {
		$settings = $this->get_settings();
		$modules  = $this->modules->all();

		ob_start();

		switch ( $screen_slug ) {
			case 'noorsmtp-test':
				include NOORSMTP_PATH . 'src/Admin/views/test-page.php';
				break;

			case 'noorsmtp-log':
				include NOORSMTP_PATH . 'src/Admin/views/log-page.php';
				break;

			case 'noorsmtp-upgrade':
				include NOORSMTP_PATH . 'src/Admin/views/upgrade-panel.php';
				break;

			case self::MENU_SLUG:
			default:
				/**
				 * Allow custom screen rendering (e.g. Pro Features / Routing / Analytics / License from Pro).
				 */
				$custom_rendered = apply_filters( 'noorsmtp_render_screen_body', false, $screen_slug, $settings );
				if ( ! $custom_rendered ) {
					include NOORSMTP_PATH . 'src/Admin/views/settings-page.php';
				}
				break;
		}

		return (string) ob_get_clean();
	}

	/**
	 * AJAX handler for fast tab switching.
	 *
	 * @return void
	 */
	public function ajax_render_tab() {
		check_ajax_referer( 'noorsmtp_admin', 'nonce' );

		if ( ! noorsmtp_user_can_manage() ) {
			wp_send_json_error( array( 'message' => __( 'You do not have permission to do this.', 'noorsmtp' ) ), 403 );
		}

		$slug = isset( $_POST['slug'] ) ? sanitize_key( wp_unslash( $_POST['slug'] ) ) : self::MENU_SLUG;
		$html = $this->render_screen_body( $slug );

		wp_send_json_success(
			array(
				'slug' => $slug,
				'html' => $html,
			)
		);
	}

	/**
	 * Get the current settings, merged with defaults.
	 *
	 * @return array
	 */
	public function get_settings() {
		$defaults = array(
			'mailer'                   => '',
			'from_email'               => get_option( 'admin_email' ),
			'from_name'                => get_bloginfo( 'name' ),
			'force_from'               => false,
			'logging_enabled'          => true,
			'delete_data_on_uninstall' => false,
		);

		foreach ( $this->modules->all() as $module ) {
			foreach ( $module->settings_fields() as $key => $field ) {
				$defaults[ $key ] = isset( $field['default'] ) ? $field['default'] : '';
			}
		}

		$stored = get_option( 'noorsmtp_settings', array() );

		return wp_parse_args( $stored, $defaults );
	}

	/**
	 * Module manager accessor.
	 *
	 * @return ModuleManager
	 */
	public function modules() {
		return $this->modules;
	}

	/**
	 * Backwards compatibility render header helper.
	 *
	 * @param string $current_slug Slug.
	 * @return void
	 */
	public static function render_header( $current_slug = 'noorsmtp' ) {
		// Handled centrally in render_app().
		unset( $current_slug );
	}

	/**
	 * Backwards compatibility render footer helper.
	 *
	 * @param string $current_slug Slug.
	 * @return void
	 */
	public static function render_footer( $current_slug = 'noorsmtp' ) {
		// Handled centrally in render_app().
		unset( $current_slug );
	}
}