<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class UserGroup extends Model
{
    use HasFactory, SoftDeletes;

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'name',
        'description',
        'permissions',
        'is_system',
    ];

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'permissions' => 'array',
            'is_system' => 'boolean',
        ];
    }

    /**
     * Get the users that belong to the user group.
     */
    public function users(): BelongsToMany
    {
        return $this->belongsToMany(User::class, 'user_user_group')
            ->withTimestamps();
    }

    /**
     * Check if group has a specific permission.
     */
    public function hasPermission(string $permission): bool
    {
        return in_array($permission, $this->permissions ?? []);
    }

    /**
     * Add a permission to the group.
     */
    public function addPermission(string $permission): void
    {
        $permissions = $this->permissions ?? [];
        if (!in_array($permission, $permissions)) {
            $permissions[] = $permission;
            $this->permissions = $permissions;
            $this->save();
        }
    }

    /**
     * Remove a permission from the group.
     */
    public function removePermission(string $permission): void
    {
        $permissions = $this->permissions ?? [];
        $permissions = array_values(array_filter($permissions, fn($p) => $p !== $permission));
        $this->permissions = $permissions;
        $this->save();
    }
}