<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Spatie\Permission\Traits\HasPermissions;
use Illuminate\Database\Eloquent\Builder;

class Group extends Model
{
    use SoftDeletes, HasPermissions;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'description'
    ];

    /**
     * The accessors to append to the model's array form.
     *
     * @var array
     */
    protected $appends = ['permission_names'];

    /**
     * Relationship: Users belonging to this group
     */
    public function users(): BelongsToMany
    {
        return $this->belongsToMany(User::class)
            ->withTimestamps()
            ->using(GroupUser::class);
    }

    /**
     * Relationship: Permissions assigned to this group
     */
    public function permissions(): BelongsToMany
    {
        return $this->belongsToMany(
            config('permission.models.permission'),
            config('permission.table_names.group_has_permissions'),
            'group_id',
            'permission_id'
        );
    }

    /**
     * Scope: Groups with specific permission
     */
    public function scopeWithPermission(Builder $query, $permission): Builder
    {
        return $query->whereHas('permissions', function ($q) use ($permission) {
            $q->where('name', $permission);
        });
    }

    /**
     * Scope: Groups with permissions on specific resource
     */
    public function scopeWithResourcePermissions(Builder $query, $resourceId, $resourceType): Builder
    {
        return $query->whereHas('permissions', function ($q) use ($resourceId, $resourceType) {
            $q->where('name', 'like', "{$resourceType}-{$resourceId}-%");
        });
    }

    /**
     * Assign permission to group
     */
    public function assignPermission($permission): self
    {
        if (is_string($permission)) {
            $permission = Permission::findByName($permission);
        }

        $this->permissions()->syncWithoutDetaching($permission);

        return $this;
    }

    /**
     * Revoke permission from group
     */
    public function revokePermission($permission): self
    {
        if (is_string($permission)) {
            $permission = Permission::findByName($permission);
        }

        $this->permissions()->detach($permission);

        return $this;
    }

    /**
     * Sync all permissions
     */
    public function syncPermissions($permissions): self
    {
        $permissionIds = collect($permissions)->map(function ($perm) {
            return is_string($perm) ? Permission::findByName($perm)->id : $perm->id;
        });

        $this->permissions()->sync($permissionIds);

        return $this;
    }

    /**
     * Check if group has permission
     */
    public function hasPermission($permission): bool
    {
        if (is_string($permission)) {
            return $this->permissions->contains('name', $permission);
        }

        return $this->permissions->contains('id', $permission->id);
    }

    /**
     * Get all users with permissions through this group
     */
    public function getUsersWithPermissionsAttribute()
    {
        return User::whereHas('groups', function ($query) {
            $query->where('groups.id', $this->id);
        })->get();
    }

    /**
     * Get permission names attribute
     */
    public function getPermissionNamesAttribute()
    {
        return $this->permissions->pluck('name');
    }

    /**
     * Validation rules
     */
    public static function validationRules($groupId = null): array
    {
        return [
            'name' => 'required|string|max:255|unique:groups,name,'.$groupId,
            'description' => 'nullable|string|max:500',
            'permissions' => 'array',
            'permissions.*' => 'exists:permissions,id',
            'users' => 'array',
            'users.*' => 'exists:users,id'
        ];
    }

    /**
     * The "booting" method of the model
     */
    protected static function boot()
    {
        parent::boot();

        static::deleting(function ($group) {
            if ($group->isForceDeleting()) {
                $group->users()->detach();
                $group->permissions()->detach();
            }
        });
    }
}