<?php

namespace App\Services\Parents;

use App\Controllers\View\InvoiceController;
use App\Models\EnrollmentModel;
use App\Models\EventChargesModel;
use App\Models\EventModel;

class ParentEventParticipationService
{
    public function __construct(
        private readonly EventChargesModel $chargesModel,
        private readonly EventModel $eventModel,
        private readonly EnrollmentModel $enrollmentModel,
        private readonly InvoiceController $invoiceController,
    ) {
    }

    public function pageData(int $parentId, string $schoolYear, string $semester): array
    {
        $activeEvents = $this->eventModel->getActiveEvents($schoolYear, $semester);
        $chargesList = $this->chargesModel->getChargesWithEventInfo($parentId, $schoolYear, $semester);

        $charges = [];
        $externalParticipantsByEvent = [];
        foreach ($chargesList as $charge) {
            $studentId = $charge['student_id'] ?? null;
            $eventId = (int) ($charge['event_id'] ?? 0);

            if (! empty($studentId)) {
                $charges[$studentId . ':' . $eventId] = [
                    'participation' => $charge['participation'],
                    'date' => $charge['updated_at'] ?? $charge['created_at'],
                ];
                continue;
            }

            $externalName = trim((string) ($charge['external_firstname'] ?? '') . ' ' . (string) ($charge['external_lastname'] ?? ''));
            if ($eventId > 0 && $externalName !== '') {
                $externalParticipantsByEvent[$eventId][] = [
                    'name' => $externalName,
                    'note' => (string) ($charge['external_note'] ?? ''),
                    'participation' => (string) ($charge['participation'] ?? ''),
                    'event_paid' => ! empty($charge['event_paid']),
                    'charged' => (float) ($charge['charged'] ?? ($charge['event_amount'] ?? 0)),
                ];
            }
        }

        return [
            'activeEvents' => $activeEvents,
            'charges' => $charges,
            'externalParticipantsByEvent' => $externalParticipantsByEvent,
            'yourStudents' => $this->enrollmentModel->getEnrolledStudents($parentId, $schoolYear),
            'activeEventCount' => is_array($activeEvents) ? count($activeEvents) : 0,
        ];
    }

    public function updateParticipation(array $participations, int $parentId, string $schoolYear, string $semester): void
    {
        foreach ($participations as $key => $value) {
            [$studentId, $eventId] = explode(':', (string) $key);

            $existing = $this->chargesModel->where([
                'parent_id' => $parentId,
                'student_id' => $studentId,
                'event_id' => $eventId,
            ])->first();

            if ($value === 'no') {
                if ($existing) {
                    $this->chargesModel->delete($existing['id']);
                }
                continue;
            }

            if ($existing) {
                $this->chargesModel->update($existing['id'], ['participation' => $value]);
                continue;
            }

            $event = $this->eventModel->getEvent($eventId, $schoolYear);
            $this->chargesModel->insert([
                'parent_id' => $parentId,
                'student_id' => $studentId,
                'event_id' => $eventId,
                'participation' => $value,
                'charged' => $event['amount'],
                'school_year' => $schoolYear,
                'semester' => $semester,
                'updated_by' => $parentId,
            ]);
        }

        $this->invoiceController->generateInvoice($parentId);
    }
}