<?php
declare(strict_types=1);

namespace Unsupervised\Schedular;

use Unsupervised\Schedular\Availability\AvailabilityController;
use Unsupervised\Schedular\Availability\AvailabilityRepository;
use Unsupervised\Schedular\Availability\WindowValidator;
use Unsupervised\Schedular\Auth\AccessSettings;
use Unsupervised\Schedular\Auth\InstructorController;
use Unsupervised\Schedular\Auth\InviteRepository;
use Unsupervised\Schedular\Auth\RegistrationApprovalController;
use Unsupervised\Schedular\Auth\RegistrationController;
use Unsupervised\Schedular\Auth\RegistrationMailer;
use Unsupervised\Schedular\Auth\RoleManager;
use Unsupervised\Schedular\Auth\StudentActions;
use Unsupervised\Schedular\Auth\StudentController;
use Unsupervised\Schedular\Guardian\GuardianService;
use Unsupervised\Schedular\Auth\StudentHistory;
use Unsupervised\Schedular\Booking\BookingRepository;
use Unsupervised\Schedular\Booking\LessonController;
use Unsupervised\Schedular\Booking\LessonDetail;
use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
use Unsupervised\Schedular\GroupClass\GroupClassController;
use Unsupervised\Schedular\GroupClass\SessionSchedule;
use Unsupervised\Schedular\Offering\ClassSlotReconciler;
use Unsupervised\Schedular\Offering\OfferingController;
use Unsupervised\Schedular\Offering\OfferingRepository;
use Unsupervised\Schedular\Payment\BillingMethodResolver;
use Unsupervised\Schedular\Payment\CreditRepository;
use Unsupervised\Schedular\Payment\PaymentController;
use Unsupervised\Schedular\Payment\PaymentReportController;
use Unsupervised\Schedular\Payment\PaymentRepository;
use Unsupervised\Schedular\Payment\PaymentService;
use Unsupervised\Schedular\Payment\StudioSettings;
use Unsupervised\Schedular\Policy\AcceptanceRepository;
use Unsupervised\Schedular\Policy\PolicyController;
use Unsupervised\Schedular\Policy\PolicyRepository;
use Unsupervised\Schedular\Policy\PolicyService;
use Unsupervised\Schedular\Policy\PolicyVersionRepository;
use Unsupervised\Schedular\Registration\AnswerRepository;
use Unsupervised\Schedular\Registration\QuestionController;
use Unsupervised\Schedular\Registration\QuestionRepository;

class AdminMenu {

	/**
	 * Hook suffix of the availability screen, captured when the page is added so
	 * its script loads on that screen only.
	 */
	private string $availabilityHook = '';

	private AvailabilityController $availabilityController;
	private LessonController $lessonController;
	private OfferingController $offeringController;
	private QuestionController $questionController;
	private PolicyController $policyController;
	private RegistrationController $registrationController;
	private RegistrationApprovalController $registrationApprovalController;
	private GroupClassController $groupClassController;
	private StudentController $studentController;
	private InstructorController $instructorController;
	private StudioSettings $settings;
	private AccessSettings $accessSettings;
	private PaymentController $paymentController;
	private PaymentReportController $paymentReportController;

	public function __construct( AvailabilityRepository $availability, BookingRepository $bookings, OfferingRepository $offerings, QuestionRepository $questions, AnswerRepository $answers, PolicyRepository $policies, PolicyVersionRepository $policyVersions, PolicyService $policyService, AcceptanceRepository $acceptances, InviteRepository $invites, EnrollmentRepository $enrollments, GroupAccessRepository $groupAccess, StudioSettings $settings, PaymentRepository $payments, PaymentService $paymentService, BillingMethodResolver $resolver, RegistrationMailer $registrationMailer, CreditRepository $credits, GuardianService $guardians ) {
		$this->availabilityController         = new AvailabilityController( $availability, $offerings, new WindowValidator( $offerings ) );
		$this->lessonController               = new LessonController( $bookings, $payments, $availability, $offerings, new LessonDetail( $answers, $questions, $acceptances, $policies, $policyVersions ) );
		$this->offeringController             = new OfferingController( $offerings, new ClassSlotReconciler( $availability ) );
		$this->questionController             = new QuestionController( $questions, $offerings );
		$this->policyController               = new PolicyController( $policies, $policyVersions, $policyService );
		$this->registrationController         = new RegistrationController( $invites );
		$this->registrationApprovalController = new RegistrationApprovalController( $registrationMailer );
		$this->groupClassController           = new GroupClassController( $enrollments, $offerings, $payments, $groupAccess, $paymentService, $invites, $registrationMailer );
		$this->studentController              = new StudentController( $bookings, $availability, $offerings, $enrollments, $resolver, new StudentHistory( $acceptances, $policies, $policyVersions, $answers, $questions, $payments, $credits ), new StudentActions( $bookings, $availability, $enrollments, $paymentService ), $guardians, new SessionSchedule( $enrollments, $offerings ) );
		$this->instructorController           = new InstructorController();
		$this->settings                       = $settings;
		$this->accessSettings                 = new AccessSettings();
		$this->paymentController              = new PaymentController( $payments, $paymentService );
		$this->paymentReportController        = new PaymentReportController( $payments );
	}

	public function register(): void {
		add_action( 'admin_menu', [ $this, 'addPages' ] );
		add_action( 'admin_enqueue_scripts', [ $this, 'enqueueAssets' ] );
		add_action( 'admin_post_' . PaymentReportController::EXPORT_ACTION, [ $this->paymentReportController, 'export' ] );
	}

	/**
	 * Load a screen's script on that screen only.
	 *
	 * @param string $hookSuffix Screen the enqueue is running for.
	 */
	public function enqueueAssets( string $hookSuffix ): void {
		if ( '' === $this->availabilityHook || $hookSuffix !== $this->availabilityHook ) {
			return;
		}

		wp_enqueue_script(
			'us-scheduler-availability-admin',
			USC_PLUGIN_URL . 'assets/js/availability-admin.js',
			[],
			USC_VERSION,
			true
		);
	}

	public function addPages(): void {
		$this->addStudioSeparators();

		// Studio-wide dashboard: all upcoming lessons across instructors.
		add_menu_page(
			__( 'Scheduler', 'unsupervised-schedular' ),
			__( 'Scheduler', 'unsupervised-schedular' ),
			RoleManager::CAP_VIEW_ALL_LESSONS,
			'us-scheduler',
			[ $this->lessonController, 'renderAdminDashboard' ],
			'dashicons-calendar-alt',
			40
		);

		// Instructor: manage their own availability.
		$this->availabilityHook = (string) add_menu_page(
			__( 'My Availability', 'unsupervised-schedular' ),
			__( 'My Availability', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_AVAILABILITY,
			'us-availability',
			[ $this->availabilityController, 'renderPage' ],
			'dashicons-clock',
			41
		);

		// Studio admin / instructor: manage offerings.
		add_menu_page(
			__( 'Offerings', 'unsupervised-schedular' ),
			__( 'Offerings', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_OFFERINGS,
			'us-offerings',
			[ $this->offeringController, 'renderPage' ],
			'dashicons-tag',
			33
		);

		// Studio admin / instructor: manage per-offering intake questions.
		add_submenu_page(
			'us-offerings',
			__( 'Questions', 'unsupervised-schedular' ),
			__( 'Questions', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_QUESTIONS,
			'us-questions',
			[ $this->questionController, 'renderPage' ]
		);

		// Studio admin: draft, version, and publish policies.
		add_menu_page(
			__( 'Policies', 'unsupervised-schedular' ),
			__( 'Policies', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_POLICIES,
			'us-policies',
			[ $this->policyController, 'renderPage' ],
			'dashicons-text-page',
			31
		);

		// Studio admin: invite students to register.
		add_menu_page(
			__( 'Invites', 'unsupervised-schedular' ),
			__( 'Invites', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_STUDENTS,
			'us-invites',
			[ $this->registrationController, 'renderPage' ],
			'dashicons-email',
			32
		);

		// Studio admin: all group-class enrolments.
		add_menu_page(
			__( 'Group Classes', 'unsupervised-schedular' ),
			__( 'Group Classes', 'unsupervised-schedular' ),
			RoleManager::CAP_VIEW_ALL_LESSONS,
			'us-group-classes',
			[ $this->groupClassController, 'renderPage' ],
			'dashicons-groups',
			36
		);

		// Studio admin: create instructors and manage their capabilities.
		add_menu_page(
			__( 'Instructors', 'unsupervised-schedular' ),
			__( 'Instructors', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_INSTRUCTORS,
			InstructorController::PAGE_SLUG,
			[ $this->instructorController, 'renderPage' ],
			'dashicons-businessperson',
			34.5
		);

		// Studio admin: browse students and their activity.
		add_menu_page(
			__( 'Students', 'unsupervised-schedular' ),
			__( 'Students', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_STUDENTS,
			'us-students',
			[ $this->studentController, 'renderPage' ],
			'dashicons-id',
			35
		);

		// Studio admin: approve or reject self-signup students (open registration).
		add_submenu_page(
			'us-students',
			__( 'Pending Students', 'unsupervised-schedular' ),
			__( 'Pending Students', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_STUDENTS,
			RegistrationApprovalController::PAGE_SLUG,
			[ $this->registrationApprovalController, 'renderPage' ]
		);

		// Studio admin: confirm pending (e-transfer) payments.
		add_menu_page(
			__( 'Payments', 'unsupervised-schedular' ),
			__( 'Payments', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_BILLING,
			'us-payments',
			[ $this->paymentController, 'renderPage' ],
			'dashicons-money-alt',
			37
		);

		// Studio admin (all) / instructor (own): monthly payments report with HST.
		// Gated on export so instructors — who lack manage_billing — can still see it.
		add_menu_page(
			__( 'Payment Report', 'unsupervised-schedular' ),
			__( 'Payment Report', 'unsupervised-schedular' ),
			RoleManager::CAP_EXPORT_PAYMENTS,
			'us-reports',
			[ $this->paymentReportController, 'renderPage' ],
			'dashicons-chart-bar',
			38
		);

		// Studio admin: Stripe credentials and billing settings.
		add_menu_page(
			__( 'Studio Settings', 'unsupervised-schedular' ),
			__( 'Studio Settings', 'unsupervised-schedular' ),
			RoleManager::CAP_MANAGE_BILLING,
			'us-settings',
			[ $this->settings, 'renderPage' ],
			'dashicons-admin-settings',
			30
		);

		// Site owner: whether WordPress administrators are studio admins / instructors.
		// Gated on the core manage_options capability — never the plugin's own grants —
		// so an administrator can always reach it to re-enable a disabled grant.
		add_menu_page(
			__( 'Access', 'unsupervised-schedular' ),
			__( 'Access', 'unsupervised-schedular' ),
			'manage_options',
			'us-access',
			[ $this->accessSettings, 'renderPage' ],
			'dashicons-admin-network',
			30.5
		);

		// Instructor: view their upcoming lessons. Hidden for anyone who can
		// already see the Scheduler — it shows every instructor's lessons
		// (including their own, with the same payment edit forms), so the two
		// menu items would just duplicate each other for an owner-operator.
		if ( ! current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS ) ) {
			add_menu_page(
				__( 'My Lessons', 'unsupervised-schedular' ),
				__( 'My Lessons', 'unsupervised-schedular' ),
				RoleManager::CAP_VIEW_LESSONS,
				'us-my-lessons',
				[ $this->lessonController, 'renderInstructorLessons' ],
				'dashicons-welcome-learn-more',
				42
			);

			// Instructor: their own group classes with per-class rosters.
			add_submenu_page(
				'us-my-lessons',
				__( 'My Group Classes', 'unsupervised-schedular' ),
				__( 'My Group Classes', 'unsupervised-schedular' ),
				RoleManager::CAP_VIEW_LESSONS,
				'us-my-group-classes',
				[ $this->groupClassController, 'renderInstructorPage' ]
			);
		}
	}

	/**
	 * Insert sidebar separators around the studio menus so they sit visually
	 * apart from the core WordPress items and split into three sections —
	 * mirroring the dividers core uses. Each separator is only added when the user
	 * can see a menu in the following section, to avoid orphaned dividers.
	 *
	 * Layout: [29] · setup (Settings/Policies/Invites/Offerings) · [34] ·
	 * people & money (Students/Group Classes/Payments/Payment Report) · [39] ·
	 * operations (Scheduler) and instructor menus.
	 */
	private function addStudioSeparators(): void {
		$this->addSeparatorAt( 29, $this->userSeesStudioMenu() );
		$this->addSeparatorAt( 34, $this->userSeesPeopleSection() );
		$this->addSeparatorAt( 39, current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS ) );
	}

	private function addSeparatorAt( int $position, bool $visible ): void {
		if ( ! $visible ) {
			return;
		}

		global $menu;
		if ( ! is_array( $menu ) || isset( $menu[ $position ] ) ) {
			return;
		}

		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- writing to $menu is the supported way to add an admin sidebar separator.
		$menu[ $position ] = [ '', 'read', 'us-studio-separator-' . $position, '', 'wp-menu-separator' ];
	}

	private function userSeesPeopleSection(): bool {
		return current_user_can( RoleManager::CAP_MANAGE_INSTRUCTORS )
			|| current_user_can( RoleManager::CAP_MANAGE_STUDENTS )
			|| current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS )
			|| current_user_can( RoleManager::CAP_MANAGE_BILLING );
	}

	private function userSeesStudioMenu(): bool {
		// Administrators always see the Access page, so the leading separator
		// should show for them even if both capability grants are disabled.
		if ( current_user_can( 'manage_options' ) ) {
			return true;
		}

		$caps = [
			RoleManager::CAP_VIEW_ALL_LESSONS,
			RoleManager::CAP_VIEW_LESSONS,
			RoleManager::CAP_MANAGE_AVAILABILITY,
			RoleManager::CAP_MANAGE_OFFERINGS,
			RoleManager::CAP_MANAGE_QUESTIONS,
			RoleManager::CAP_MANAGE_POLICIES,
			RoleManager::CAP_MANAGE_STUDENTS,
			RoleManager::CAP_MANAGE_BILLING,
		];

		foreach ( $caps as $cap ) {
			if ( current_user_can( $cap ) ) {
				return true;
			}
		}

		return false;
	}
}