<?php

declare(strict_types=1);

namespace App\Services\Artworks;

use App\DTOs\Artworks\ArtworkDraftResult;
use App\Models\Artwork;
use App\Models\Group;
use App\Models\User;
use App\Services\GroupService;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

final class ArtworkDraftService
{
    public function __construct(
        private readonly GroupService $groups,
    ) {
    }

    public function createDraft(User $user, string $title, ?string $description, ?int $categoryId = null, bool $isMature = false, string|int|null $groupIdentifier = null): ArtworkDraftResult
    {
        return DB::transaction(function () use ($user, $title, $description, $categoryId, $isMature, $groupIdentifier) {
            $slug = $this->makeSlug($title);
            $group = $this->resolveGroup($user, $groupIdentifier);

            $artwork = Artwork::create([
                'user_id' => (int) $user->id,
                'group_id' => $group?->id,
                'uploaded_by_user_id' => (int) $user->id,
                'primary_author_user_id' => (int) $user->id,
                'published_as_type' => $group ? Artwork::PUBLISHED_AS_GROUP : Artwork::PUBLISHED_AS_USER,
                'published_as_id' => $group?->id ?: (int) $user->id,
                'title' => $title,
                'slug' => $slug,
                'description' => $description,
                'file_name' => 'pending',
                'file_path' => '',
                'file_size' => 0,
                'mime_type' => 'application/octet-stream',
                'width' => 1,
                'height' => 1,
                'is_public' => false,
                'visibility' => Artwork::VISIBILITY_PRIVATE,
                'is_approved' => false,
                'is_mature' => $isMature,
                'published_at' => null,
                'artwork_status' => 'draft',
            ]);

            // Attach the selected category to the artwork pivot table
            if ($categoryId !== null && \App\Models\Category::where('id', $categoryId)->exists()) {
                $artwork->categories()->sync([$categoryId]);
            }

            if ($group) {
                $this->groups->syncArtworkCount($group);
            }

            return new ArtworkDraftResult((int) $artwork->id, 'draft');
        });
    }

    private function resolveGroup(User $user, string|int|null $groupIdentifier): ?Group
    {
        if ($groupIdentifier === null || $groupIdentifier === '') {
            return null;
        }

        $group = is_numeric($groupIdentifier)
            ? Group::query()->with('members')->findOrFail((int) $groupIdentifier)
            : Group::query()->with('members')->where('slug', (string) $groupIdentifier)->firstOrFail();

        if (! $group->canCreateArtworkDrafts($user) && ! $user->isAdmin()) {
            throw ValidationException::withMessages([
                'group' => 'You are not allowed to create drafts for this group.',
            ]);
        }

        return $group;
    }

    private function makeSlug(string $title): string
    {
        $base = Str::slug($title);

        return Str::limit($base !== '' ? $base : 'artwork', 160, '');
    }
}