<?php
/**
 * Admin Menu Class.
 *
 * @package AISupportAssistant\Admin
 */

namespace AISupportAssistant\Admin;

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

/**
 * Class Menu
 */
class Menu {

	/**
	 * Single instance of the class.
	 *
	 * @var Menu|null
	 */
	private static ?Menu $instance = null;

	/**
	 * Get active instance of the class.
	 *
	 * @return Menu
	 */
	public static function get_instance(): Menu {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		add_action( 'admin_menu', array( $this, 'register_menu_pages' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ) );
	}

	/**
	 * Register the menu and submenu pages.
	 *
	 * @return void
	 */
	public function register_menu_pages(): void {
		$capability  = 'manage_options';
		$parent_slug = 'ai-support-assistant';

		// Register parent menu.
		add_menu_page(
			__( 'AI Support Assistant', 'ai-support-assistant' ),
			__( 'AI Support', 'ai-support-assistant' ),
			$capability,
			$parent_slug,
			array( Views::class, 'render_dashboard' ),
			'dashicons-format-chat',
			100
		);

		// Submenus.
		add_submenu_page(
			$parent_slug,
			__( 'Dashboard', 'ai-support-assistant' ),
			__( 'Dashboard', 'ai-support-assistant' ),
			$capability,
			$parent_slug,
			array( Views::class, 'render_dashboard' )
		);

		add_submenu_page(
			$parent_slug,
			__( 'Upload', 'ai-support-assistant' ),
			__( 'Upload', 'ai-support-assistant' ),
			$capability,
			'ai-support-assistant-upload',
			array( Views::class, 'render_upload' )
		);

		add_submenu_page(
			$parent_slug,
			__( 'Documents', 'ai-support-assistant' ),
			__( 'Documents', 'ai-support-assistant' ),
			$capability,
			'ai-support-assistant-documents',
			array( Views::class, 'render_documents' )
		);

		add_submenu_page(
			$parent_slug,
			__( 'Chat Logs', 'ai-support-assistant' ),
			__( 'Chat Logs', 'ai-support-assistant' ),
			$capability,
			'ai-support-assistant-logs',
			array( Views::class, 'render_logs' )
		);

		add_submenu_page(
			$parent_slug,
			__( 'Statistics', 'ai-support-assistant' ),
			__( 'Statistics', 'ai-support-assistant' ),
			$capability,
			'ai-support-assistant-statistics',
			array( Views::class, 'render_statistics' )
		);

		add_submenu_page(
			$parent_slug,
			__( 'Settings', 'ai-support-assistant' ),
			__( 'Settings', 'ai-support-assistant' ),
			$capability,
			'ai-support-assistant-settings',
			array( Views::class, 'render_settings' )
		);
	}

	/**
	 * Enqueue admin styles and scripts selectively.
	 *
	 * @param string $hook Page hook screen name.
	 * @return void
	 */
	public function enqueue_assets( string $hook ): void {
		$screen      = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		$screen_id   = $screen ? $screen->id : '';
		$screen_base = $screen ? $screen->base : '';
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only page query parameter used for conditional script enqueuing.
		$page_param = isset( $_GET['page'] ) ? sanitize_text_field( wp_unslash( $_GET['page'] ) ) : '';

		$is_plugin_page = ( strpos( $hook, 'ai-support-assistant' ) !== false )
			|| ( strpos( $screen_id, 'ai-support-assistant' ) !== false )
			|| ( strpos( $screen_base, 'ai-support-assistant' ) !== false )
			|| ( strpos( $page_param, 'ai-support-assistant' ) !== false );

		if ( ! $is_plugin_page ) {
			return;
		}

		wp_enqueue_media();

		$css_ver = file_exists( AI_SUPPORT_ASSISTANT_PATH . 'assets/css/admin.css' ) ? (string) filemtime( AI_SUPPORT_ASSISTANT_PATH . 'assets/css/admin.css' ) : AI_SUPPORT_ASSISTANT_VERSION;
		$js_ver  = file_exists( AI_SUPPORT_ASSISTANT_PATH . 'assets/js/admin.js' ) ? (string) filemtime( AI_SUPPORT_ASSISTANT_PATH . 'assets/js/admin.js' ) : AI_SUPPORT_ASSISTANT_VERSION;

		wp_enqueue_style(
			'ai-support-assistant-admin-style',
			AI_SUPPORT_ASSISTANT_URL . 'assets/css/admin.css',
			array(),
			$css_ver
		);

		wp_enqueue_script(
			'ai-support-assistant-admin-js',
			AI_SUPPORT_ASSISTANT_URL . 'assets/js/admin.js',
			array( 'jquery' ),
			$js_ver,
			true
		);

		// Localize standard endpoints & nonce for JS callbacks.
		wp_localize_script(
			'ai-support-assistant-admin-js',
			'AISupportAssistantAdmin',
			array(
				'ajaxUrl'   => admin_url( 'admin-ajax.php' ),
				'restUrl'   => esc_url_raw( get_rest_url( null, 'ai-support-assistant/v1' ) ),
				'nonce'     => wp_create_nonce( 'wp_rest' ),
				'modelsUrl' => esc_url_raw( get_rest_url( null, 'ai-support-assistant/v1/admin/models' ) ),
				'i18n'      => array(
					'uploading'      => __( 'Uploading...', 'ai-support-assistant' ),
					'indexing'       => __( 'Indexing...', 'ai-support-assistant' ),
					'completed'      => __( 'Completed', 'ai-support-assistant' ),
					'failed'         => __( 'Failed', 'ai-support-assistant' ),
					'confirmDelete'  => __( 'Are you sure you want to delete this document and all its chunks?', 'ai-support-assistant' ),
					'confirmClear'   => __( 'Are you sure you want to clear all chat logs?', 'ai-support-assistant' ),
					'confirmReindex' => __( 'Are you sure you want to re-index this document?', 'ai-support-assistant' ),
				),
			)
		);
	}
}