<?php

declare(strict_types=1);

namespace App\Services;

use App\Data\Role\{CreateRoleData, RoleData, UpdateRolePriorityData};
use App\Models\Role;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use InvalidArgumentException;
use NoDiscard;
use Spatie\LaravelData\{DataCollection, PaginatedDataCollection};
use Throwable;

final class RoleService
{
    /**
     * Create a new role.
     * Returns the created role DTO
     *
     * @throws Throwable when an error occurs during the creation.
     */
    public function create(CreateRoleData $data): RoleData
    {
        $role = DB::transaction(fn () => Role::query()->create([
            'name' => $data->name,
            'priority' => $data->priority,
            'guard_name' => 'web',
        ]));

        return RoleData::from($role);
    }

    /**
     * @throws InvalidArgumentException when id is invalid.
     * @throws Throwable when an error occurs during the deletion.
     */
    public function delete(int $id): void
    {
        if ($id <= 0) {
            throw new InvalidArgumentException('Invalid id');
        }

        DB::transaction(function () use ($id): void {
            Role::query()->findOrFail($id)->delete();
        });
    }

    /**
     * Returns a Paginated Collection of roles with their connected apps DTO
     *
     * @return PaginatedDataCollection<int, RoleData>
     */
    #[NoDiscard]
    public function getAll(): PaginatedDataCollection
    {
        $roles = Role::query()
            ->visible()
            ->with(['apps:id,name', 'users:id,name'])
            ->orderBy('id')
            ->paginate();

        return RoleData::collect($roles, PaginatedDataCollection::class);
    }

    public function searchRolesForSelect(string $search = ''): Collection
    {
        return Role::query()
            ->visible()
            ->when('' !== $search, fn ($query) => $query->where('name', 'like', "%{$search}%"))
            ->select('id', 'name')
            ->get();
    }

    public function getAllRoleIds(): array
    {
        return Role::query()->visible()->pluck('id')->toArray();
    }

    /**
     * Return all permissions for the given roles, grouped by role name.
     * Each permission is a plain array so Livewire can serialise the property cleanly.
     *
     * @param  array<int, int>  $roleIds
     *
     * @return DataCollection<int, RoleData>|null
     */
    #[NoDiscard]
    public function getPermissionsGroupedByRole(array $roleIds): ?DataCollection
    {
        if (empty($roleIds)) {
            return null;
        }

        $roles = Role::query()
            ->visible()
            ->with('permissions:id,name')
            ->whereIn('id', $roleIds)
            ->get(['id', 'name', 'priority']);

        return RoleData::collect($roles, DataCollection::class);
    }

    /**
     * Update the priority of a role.
     *
     * @throws InvalidArgumentException when roleId is invalid.
     * @throws Throwable when an error occurs during the update.
     */
    public function updatePriority(UpdateRolePriorityData $data): RoleData
    {
        if ($data->roleId <= 0) {
            throw new InvalidArgumentException('Invalid role id');
        }

        $role = DB::transaction(function () use ($data) {
            $role = Role::query()->findOrFail($data->roleId);
            $role->update([
                'priority' => $data->priority,
            ]);

            return $role;
        });

        return RoleData::from($role);
    }
}