<?php
/**
 * WordPress admin menu registration.
 *
 * @package Shiftora\Admin
 */

declare(strict_types=1);

namespace Shiftora\Admin;

use Shiftora\Admin\Pages\BackupsPage;
use Shiftora\Admin\Pages\ConnectionsPage;
use Shiftora\Admin\Pages\DashboardPage;
use Shiftora\Admin\Pages\HelpPage;
use Shiftora\Admin\Pages\MigrationPage;
use Shiftora\Admin\Pages\ProfilesPage;
use Shiftora\Admin\Pages\SettingsPage;
use Shiftora\Admin\Pages\UpgradesPage;

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Registers the Shiftora top-level menu and its sub-pages.
 */
final class AdminMenu {

	/** Capability required to access Shiftora. */
	public const CAPABILITY = 'manage_options';

	/** Parent menu slug. */
	public const MENU_SLUG = 'shiftora';

	/**
	 * Registers all admin menu pages, in the same order as the header nav.
	 *
	 * Every page stays registered and only the sidebar is pruned: WordPress checks
	 * page access right after `admin_menu` using `$submenu`, so removing entries
	 * here breaks direct access.
	 */
	public function register(): void {
		add_menu_page(
			__( 'Shiftora', 'shiftora' ),
			__( 'Shiftora', 'shiftora' ),
			self::CAPABILITY,
			self::MENU_SLUG,
			[ DashboardPage::class, 'render' ],
			$this->get_menu_icon(),
			80
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Dashboard', 'shiftora' ),
			__( 'Dashboard', 'shiftora' ),
			self::CAPABILITY,
			self::MENU_SLUG,
			[ DashboardPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Migration', 'shiftora' ),
			__( 'Migration', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-migrate',
			[ MigrationPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Connections', 'shiftora' ),
			__( 'Connections', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-connections',
			[ ConnectionsPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Profiles', 'shiftora' ),
			__( 'Profiles', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-profiles',
			[ ProfilesPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Backups', 'shiftora' ),
			__( 'Backups', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-backups',
			[ BackupsPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Settings', 'shiftora' ),
			__( 'Settings', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-settings',
			[ SettingsPage::class, 'render' ]
		);

		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Add-ons', 'shiftora' ),
			__( 'Add-ons', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-upgrades',
			[ UpgradesPage::class, 'render' ]
		);

		// Help holds support, recent issues, report controls and plugin details; every "View Diagnostics" action lands here.
		add_submenu_page(
			self::MENU_SLUG,
			__( 'Shiftora Help', 'shiftora' ),
			__( 'Help', 'shiftora' ),
			self::CAPABILITY,
			'shiftora-help',
			[ HelpPage::class, 'render' ]
		);
	}

	/**
	 * Drops every Shiftora entry from a `$submenu` array; the parent lives in
	 * `$menu`, so the sidebar keeps a single "Shiftora" link.
	 *
	 * @param array $submenu The $GLOBALS['submenu'] value.
	 * @return array The submenu without the Shiftora branch.
	 */
	public static function pruned_submenu( array $submenu ): array {
		unset( $submenu[ self::MENU_SLUG ] );

		return $submenu;
	}

	/**
	 * Hides every Shiftora sub-page from the WP sidebar. Runs on `admin_head`:
	 * after the access check and title lookup read `$submenu`, before the sidebar
	 * renders. The in-app nav is the only place users navigate.
	 */
	public function prune_sidebar(): void {
		global $submenu;

		$submenu = self::pruned_submenu( $submenu );
	}

	/** Returns the menu icon asset for the Shiftora admin entry. */
	private function get_menu_icon(): string {
		$icon_path = SHIFTORA_DIR . 'resources/images/shiftora-wp-icon.svg';

		if ( file_exists( $icon_path ) && is_readable( $icon_path ) ) {
			$svg = trim( (string) file_get_contents( $icon_path ) );

			if ( '' !== $svg ) {
				return 'data:image/svg+xml;base64,' . base64_encode( $svg );
			}
		}

		return SHIFTORA_URL . 'resources/images/shiftora-wp-icon.png';
	}
}