<?php

namespace App\Services\Settings\SchoolCalendar;

use App\Models\CalendarEvent;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class SchoolCalendarMutationService
{
    public function __construct(
        private SchoolCalendarContextService $context,
        private SchoolCalendarNotificationService $notificationService
    ) {}

    public function create(array $payload, array $targets = []): array
    {
        $data = $this->normalizePayload($payload);

        try {
            $event = DB::transaction(function () use ($data) {
                return CalendarEvent::query()->create($data);
            });
        } catch (\Throwable $e) {
            Log::error('SchoolCalendar create failed: '.$e->getMessage());
            throw $e;
        }

        $emailStatus = $this->notificationService->notify($event->toArray(), $targets);

        return [
            'event' => $event,
            'email_status' => $emailStatus,
        ];
    }

    public function update(CalendarEvent $event, array $payload, array $targets = []): array
    {
        $data = $this->normalizePayload($payload, true);

        try {
            DB::transaction(function () use ($event, $data) {
                $event->fill($data);
                $event->save();
            });
        } catch (\Throwable $e) {
            Log::error('SchoolCalendar update failed: '.$e->getMessage());
            throw $e;
        }

        $event->refresh();
        $emailStatus = $this->notificationService->notify($event->toArray(), $targets);

        return [
            'event' => $event,
            'email_status' => $emailStatus,
        ];
    }

    public function delete(CalendarEvent $event): void
    {
        try {
            DB::transaction(function () use ($event) {
                $event->delete();
            });
        } catch (\Throwable $e) {
            Log::error('SchoolCalendar delete failed: '.$e->getMessage());
            throw $e;
        }
    }

    private function normalizePayload(array $payload, bool $partial = false): array
    {
        if ($partial) {
            $data = [];
            foreach ([
                'title',
                'description',
                'event_type',
                'date',
                'notify_parent',
                'notify_teacher',
                'notify_admin',
                'no_school',
                'school_year',
                'semester',
            ] as $key) {
                if (! array_key_exists($key, $payload)) {
                    continue;
                }

                if (in_array($key, ['notify_parent', 'notify_teacher', 'notify_admin', 'no_school'], true)) {
                    $data[$key] = ! empty($payload[$key]) ? 1 : 0;
                    continue;
                }

                $data[$key] = $payload[$key];
            }

            if (! CalendarEvent::supportsEventType()) {
                unset($data['event_type']);
            }

            return $data;
        }

        $data = [
            'title' => (string) ($payload['title'] ?? ''),
            'description' => $payload['description'] ?? null,
            'event_type' => $payload['event_type'] ?? null,
            'date' => $payload['date'] ?? $payload['start'] ?? null,
            'notify_parent' => ! empty($payload['notify_parent']) ? 1 : 0,
            'notify_teacher' => ! empty($payload['notify_teacher']) ? 1 : 0,
            'notify_admin' => ! empty($payload['notify_admin']) ? 1 : 0,
            'no_school' => ! empty($payload['no_school']) ? 1 : 0,
            'school_year' => $payload['school_year'] ?? $this->context->defaultSchoolYear(),
            'semester' => $payload['semester'] ?? $this->context->defaultSemester(),
        ];

        if (! CalendarEvent::supportsEventType()) {
            unset($data['event_type']);
        }

        return $data;
    }
}