<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Event;
use App\Models\Organisation;
use App\Models\Person;
use App\Models\Scopes\OrganisationScope;
use Illuminate\Support\Collection;
use Spatie\Activitylog\Models\Activity;

final class OrganisationDashboardService
{
    private const ACTIVE_STATUSES = ['published', 'registration_open', 'buildup', 'showday'];

    private const STATUSES = [
        'draft',
        'published',
        'registration_open',
        'buildup',
        'showday',
        'teardown',
        'closed',
    ];

    /** @return array<string, mixed> */
    public function statsFor(Organisation $organisation): array
    {
        return [
            'members_count' => $this->membersCount($organisation),
            'events_count' => $this->eventsCount($organisation),
            'events_by_status' => $this->eventsByStatus($organisation),
            'active_events_count' => $this->activeEventsCount($organisation),
            'persons_count' => $this->personsCount($organisation),
            'top_members' => $this->topMembers($organisation),
            'recent_activity' => $this->recentActivity($organisation),
        ];
    }

    private function membersCount(Organisation $organisation): int
    {
        return $organisation->users()->count();
    }

    private function eventsCount(Organisation $organisation): int
    {
        return Event::withoutGlobalScope(OrganisationScope::class)
            ->where('organisation_id', $organisation->id)
            ->count();
    }

    /** @return array<string, int> */
    private function eventsByStatus(Organisation $organisation): array
    {
        $counts = Event::withoutGlobalScope(OrganisationScope::class)
            ->where('organisation_id', $organisation->id)
            ->selectRaw('status, COUNT(*) as total')
            ->groupBy('status')
            ->pluck('total', 'status')
            ->map(fn ($count) => (int) $count)
            ->toArray();

        $result = [];
        foreach (self::STATUSES as $status) {
            $result[$status] = $counts[$status] ?? 0;
        }

        return $result;
    }

    private function activeEventsCount(Organisation $organisation): int
    {
        return Event::withoutGlobalScope(OrganisationScope::class)
            ->where('organisation_id', $organisation->id)
            ->whereIn('status', self::ACTIVE_STATUSES)
            ->count();
    }

    private function personsCount(Organisation $organisation): int
    {
        return Person::withoutGlobalScope(OrganisationScope::class)
            ->whereIn(
                'event_id',
                Event::withoutGlobalScope(OrganisationScope::class)
                    ->where('organisation_id', $organisation->id)
                    ->select('id')
            )
            ->count();
    }

    /** @return array<int, array<string, mixed>> */
    private function topMembers(Organisation $organisation): array
    {
        return $organisation->users()
            ->orderBy('organisation_user.created_at', 'asc')
            ->limit(5)
            ->get()
            ->map(fn ($user) => [
                'id' => $user->id,
                'name' => $user->full_name,
                'email' => $user->email,
                'avatar_url' => $user->avatar,
                'role' => $user->pivot?->role,
                'joined_at' => $user->pivot?->created_at?->toIso8601String(),
            ])
            ->all();
    }

    /** @return array<int, array<string, mixed>> */
    private function recentActivity(Organisation $organisation): array
    {
        return Activity::query()
            ->where('subject_type', (new Organisation)->getMorphClass())
            ->where('subject_id', $organisation->id)
            ->with('causer')
            ->latest()
            ->limit(5)
            ->get()
            ->map(function (Activity $activity): array {
                /** @var \App\Models\User|null $causer */
                $causer = $activity->causer;

                return [
                    'id' => $activity->id,
                    'description' => $activity->description,
                    'causer_name' => $causer?->full_name,
                    'causer_avatar_url' => $causer?->avatar,
                    'subject_type' => $activity->subject_type ? class_basename($activity->subject_type) : null,
                    'subject_id' => $activity->subject_id,
                    'properties' => $activity->attribute_changes?->toArray() ?? [],
                    'created_at' => $activity->created_at?->toIso8601String(),
                ];
            })
            ->all();
    }
}