<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Auth;

use Unsupervised\Schedular\Availability\AvailabilityRepository;
use Unsupervised\Schedular\Booking\BookingRepository;
use Unsupervised\Schedular\Booking\Lesson;
use Unsupervised\Schedular\GroupClass\Enrollment;
use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
use Unsupervised\Schedular\Offering\OfferingRepository;
use Unsupervised\Schedular\Payment\BillingMethodResolver;
use Unsupervised\Schedular\Payment\Payment;

class StudentController {

	public function __construct(
		private BookingRepository $bookings,
		private AvailabilityRepository $availability,
		private OfferingRepository $offerings,
		private EnrollmentRepository $enrollments,
		private BillingMethodResolver $resolver,
	) {}

	public function renderPage(): void {
		if ( ! current_user_can( RoleManager::CAP_MANAGE_STUDENTS ) ) {
			wp_die( esc_html__( 'You do not have permission to view students.', 'unsupervised-schedular' ) );
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only student selector.
		$studentId = absint( $_GET['student_id'] ?? 0 );
		$student   = $studentId > 0 ? get_userdata( $studentId ) : false;

		if ( $student && in_array( RoleManager::STUDENT, (array) $student->roles, true ) ) {
			$this->renderDetail( $student );
			return;
		}

		$students = array_map(
			fn( \WP_User $user ): array => [
				'id'         => (int) $user->ID,
				'name'       => $user->display_name,
				'email'      => $user->user_email,
				'registered' => $user->user_registered,
				'upcoming'   => $this->bookings->countUpcomingForStudent( (int) $user->ID ),
				'enrolments' => $this->enrollments->countActiveForStudent( (int) $user->ID ),
			],
			get_users(
				[
					'role'    => RoleManager::STUDENT,
					'orderby' => 'display_name',
					'order'   => 'ASC',
				]
			)
		);

		$pageSlug = 'us-students';
		include USC_PLUGIN_DIR . 'templates/admin/students.php';
	}

	private function renderDetail( \WP_User $student ): void {
		$canBilling = current_user_can( RoleManager::CAP_MANAGE_BILLING );

		if ( $canBilling && isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_student_billing' ) ) {
			// phpcs:ignore WordPress.Security.NonceVerification.Missing -- nonce checked above.
			$method = sanitize_key( wp_unslash( $_POST['payment_method'] ?? '' ) );
			if ( in_array( $method, Payment::VALID_METHODS, true ) ) {
				update_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD, $method );
			} else {
				delete_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD );
			}
		}

		$billingOverride = (string) get_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD, true );
		$billingDefault  = $this->resolver->defaultMethod();

		$now  = current_time( 'mysql' );
		$rows = array_map(
			fn( Lesson $lesson ): array => $this->lessonRow( $lesson ),
			$this->bookings->findByStudent( (int) $student->ID )
		);

		$schedule = StudentSchedule::partition( $rows, $now );
		$upcoming = $schedule['upcoming'];
		$past     = $schedule['past'];

		$enrolments = array_map(
			function ( Enrollment $enrollment ): array {
				$offering = $this->offerings->findById( $enrollment->offeringId );

				return [
					'offering' => $offering ? $offering->title : (string) $enrollment->offeringId,
					'status'   => $enrollment->status,
				];
			},
			$this->enrollments->findByStudent( (int) $student->ID )
		);

		$backUrl = admin_url( 'admin.php?page=us-students' );
		include USC_PLUGIN_DIR . 'templates/admin/student-detail.php';
	}

	/**
	 * Build a display row for a lesson (slot time, offering, instructor, status).
	 *
	 * @return array<string, mixed>
	 */
	private function lessonRow( Lesson $lesson ): array {
		$slot       = $this->availability->findById( $lesson->slotId );
		$offering   = null !== $lesson->offeringId ? $this->offerings->findById( $lesson->offeringId ) : null;
		$instructor = get_userdata( $lesson->instructorId );

		return [
			'start_dt'   => $slot ? $slot->startDt : '',
			'end_dt'     => $slot ? $slot->endDt : '',
			'offering'   => $offering ? $offering->title : '—',
			'instructor' => $instructor ? $instructor->display_name : (string) $lesson->instructorId,
			'status'     => $lesson->status,
		];
	}
}