butes)
                )
            );
        }
    }

    /**
     * Normalize the response from a custom class caster.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return array
     */
    protected function normalizeCastClassResponse($key, $value)
    {
        return is_array($value) ? $value : [$key => $value];
    }

    /**
     * Get all of the current attributes on the model.
     *
     * @return array
     */
    public function getAttributes()
    {
        $this->mergeAttributesFromCachedCasts();

        return $this->attributes;
    }

    /**
     * Get all of the current attributes on the model for an insert operation.
     *
     * @return array
     */
    protected function getAttributesForInsert()
    {
        return $this->getAttributes();
    }

    /**
     * Set the array of model attributes. No checking is done.
     *
     * @param  array  $attributes
     * @param  bool  $sync
     * @return $this
     */
    public function setRawAttributes(array $attributes, $sync = false)
    {
        $this->attributes = $attributes;

        if ($sync) {
            $this->syncOriginal();
        }

        $this->classCastCache = [];
        $this->attributeCastCache = [];

        return $this;
    }

    /**
     * Get the model's original attribute values.
     *
     * @param  string|null  $key
     * @param  mixed  $default
     * @return mixed|array
     */
    public function getOriginal($key = null, $default = null)
    {
        return (new static)->setRawAttributes(
            $this->original, $sync = true
        )->getOriginalWithoutRewindingModel($key, $default);
    }

    /**
     * Get the model's original attribute values.
     *
     * @param  string|null  $key
     * @param  mixed  $default
     * @return mixed|array
     */
    protected function getOriginalWithoutRewindingModel($key = null, $default = null)
    {
        if ($key) {
            return $this->transformModelValue(
                $key, Arr::get($this->original, $key, $default)
            );
        }

        return Helper::collect($this->original)->mapWithKeys(function ($value, $key) {
            return [$key => $this->transformModelValue($key, $value)];
        })->all();
    }

    /**
     * Get the model's raw original attribute values.
     *
     * @param  string|null  $key
     * @param  mixed  $default
     * @return mixed|array
     */
    public function getRawOriginal($key = null, $default = null)
    {
        return Arr::get($this->original, $key, $default);
    }

    /**
     * Get a subset of the model's attributes.
     *
     * @param  array|mixed  $attributes
     * @return array
     */
    public function only($attributes)
    {
        $results = [];

        foreach (is_array($attributes) ? $attributes : func_get_args() as $attribute) {
            $results[$attribute] = $this->getAttribute($attribute);
        }

        return $results;
    }

    /**
     * Sync the original attributes with the current.
     *
     * @return $this
     */
    public function syncOriginal()
    {
        $this->original = $this->getAttributes();

        return $this;
    }

    /**
     * Sync a single original attribute with its current value.
     *
     * @param  string  $attribute
     * @return $this
     */
    public function syncOriginalAttribute($attribute)
    {
        return $this->syncOriginalAttributes($attribute);
    }

    /**
     * Sync multiple original attribute with their current values.
     *
     * @param  array|string  $attributes
     * @return $this
     */
    public function syncOriginalAttributes($attributes)
    {
        $attributes = is_array($attributes) ? $attributes : func_get_args();

        $modelAttributes = $this->getAttributes();

        foreach ($attributes as $attribute) {
            $this->original[$attribute] = $modelAttributes[$attribute];
        }

        return $this;
    }

    /**
     * Sync the changed attributes.
     *
     * @return $this
     */
    public function syncChanges()
    {
        $this->changes = $this->getDirty();

        return $this;
    }

    /**
     * Determine if the model or any of the given attribute(s) have been modified.
     *
     * @param  array|string|null  $attributes
     * @return bool
     */
    public function isDirty($attributes = null)
    {
        return $this->hasChanges(
            $this->getDirty(), is_array($attributes) ? $attributes : func_get_args()
        );
    }

    /**
     * Determine if the model or all the given attribute(s) have remained the same.
     *
     * @param  array|string|null  $attributes
     * @return bool
     */
    public function isClean($attributes = null)
    {
        return ! $this->isDirty(...func_get_args());
    }

    /**
     * Determine if the model or any of the given attribute(s) have been modified.
     *
     * @param  array|string|null  $attributes
     * @return bool
     */
    public function wasChanged($attributes = null)
    {
        return $this->hasChanges(
            $this->getChanges(), is_array($attributes) ? $attributes : func_get_args()
        );
    }

    /**
     * Determine if any of the given attributes were changed.
     *
     * @param  array  $changes
     * @param  array|string|null  $attributes
     * @return bool
     */
    protected function hasChanges($changes, $attributes = null)
    {
        // If no specific attributes were provided, we will just see if the dirty array
        // already contains any attributes. If it does we will just return that this
        // count is greater than zero. Else, we need to check specific attributes.
        if (empty($attributes)) {
            return count($changes) > 0;
        }

        // Here we will spin through every attribute and see if this is in the array of
        // dirty attributes. If it is, we will return true and if we make it through
        // all of the attributes for the entire array we will return false at end.
        foreach (Arr::wrap($attributes) as $attribute) {
            if (array_key_exists($attribute, $changes)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get the attributes that have been changed since the last sync.
     *
     * @return array
     */
    public function getDirty()
    {
        $dirty = [];

        foreach ($this->getAttributes() as $key => $value) {
            if (! $this->originalIsEquivalent($key)) {
                $dirty[$key] = $value;
            }
        }

        return $dirty;
    }

    /**
     * Get the attributes that were changed.
     *
     * @return array
     */
    public function getChanges()
    {
        return $this->changes;
    }

    /**
     * Determine if the new and old values for a given key are equivalent.
     *
     * @param  string  $key
     * @return bool
     */
    public function originalIsEquivalent($key)
    {
        if (! array_key_exists($key, $this->original)) {
            return false;
        }

        $attribute = Arr::get($this->attributes, $key);
        $original = Arr::get($this->original, $key);

        if ($attribute === $original) {
            return true;
        } elseif (is_null($attribute)) {
            return false;
        } elseif ($this->isDateAttribute($key) || $this->isDateCastableWithCustomFormat($key)) {
            return $this->fromDateTime($attribute) ===
                $this->fromDateTime($original);
        } elseif ($this->hasCast($key, ['object', 'collection'])) {
            return $this->fromJson($attribute) ===
                $this->fromJson($original);
        } elseif ($this->hasCast($key, ['real', 'float', 'double'])) {
            if (($attribute === null && $original !== null) || ($attribute !== null && $original === null)) {
                return false;
            }

            return abs($this->castAttribute($key, $attribute) - $this->castAttribute($key, $original)) < PHP_FLOAT_EPSILON * 4;
        } elseif ($this->hasCast($key, static::$primitiveCastTypes)) {
            return $this->castAttribute($key, $attribute) ===
                $this->castAttribute($key, $original);
        } elseif ($this->isClassCastable($key) && in_array($this->getCasts()[$key], [AsArrayObject::class, AsCollection::class])) {
            return $this->fromJson($attribute) === $this->fromJson($original);
        }

        return is_numeric($attribute) && is_numeric($original)
            && strcmp((string) $attribute, (string) $original) === 0;
    }

    /**
     * Transform a raw model value using mutators, casts, etc.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return mixed
     */
    protected function transformModelValue($key, $value)
    {
        // If the attribute has a get mutator, we will call that then return what
        // it returns as the value, which is useful for transforming values on
        // retrieval from the model to a form that is more useful for usage.
        if ($this->hasGetMutator($key)) {
            return $this->mutateAttribute($key, $value);
        } elseif ($this->hasAttributeGetMutator($key)) {
            return $this->mutateAttributeMarkedAttribute($key, $value);
        }

        // If the attribute exists within the cast array, we will convert it to
        // an appropriate native PHP type dependent upon the associated value
        // given with the key in the pair. Dayle made this comment line up.
        if ($this->hasCast($key)) {
            return $this->castAttribute($key, $value);
        }

        // If the attribute is listed as a date, we will convert it to a DateTime
        // instance on retrieval, which makes it quite convenient to work with
        // date fields without having to create a mutator for each property.
        if ($value !== null
            && \in_array($key, $this->getDates(), false)) {
            return $this->asDateTime($value);
        }

        return $value;
    }

    /**
     * Append attributes to query when building a query.
     *
     * @param  array|string  $attributes
     * @return $this
     */
    public function append($attributes)
    {
        $this->appends = array_unique(
            array_merge($this->appends, is_string($attributes) ? func_get_args() : $attributes)
        );

        return $this;
    }

    /**
     * Set the accessors to append to model arrays.
     *
     * @param  array  $appends
     * @return $this
     */
    public function setAppends(array $appends)
    {
        $this->appends = $appends;

        return $this;
    }

    /**
     * Return whether the accessor attribute has been appended.
     *
     * @param  string  $attribute
     * @return bool
     */
    public function hasAppended($attribute)
    {
        return in_array($attribute, $this->appends);
    }

    /**
     * Get the mutated attributes for a given instance.
     *
     * @return array
     */
    public function getMutatedAttributes()
    {
        $class = static::class;

        if (! isset(static::$mutatorCache[$class])) {
            static::cacheMutatedAttributes($class);
        }

        return static::$mutatorCache[$class];
    }

    /**
     * Extract and cache all the mutated attributes of a class.
     *
     * @param  string  $class
     * @return void
     */
    public static function cacheMutatedAttributes($class)
    {
        static::$getAttributeMutatorCache[$class] =
            Helper::collect($attributeMutatorMethods = static::getAttributeMarkedMutatorMethods($class))
                    ->mapWithKeys(function ($match) {
                        return [lcfirst(static::$snakeAttributes ? Str::snake($match) : $match) => true];
                    })->all();

        static::$mutatorCache[$class] = Helper::collect(static::getMutatorMethods($class))
                ->merge($attributeMutatorMethods)
                ->map(function ($match) {
                    return lcfirst(static::$snakeAttributes ? Str::snake($match) : $match);
                })->all();
    }

    /**
     * Get all of the attribute mutator methods.
     *
     * @param  mixed  $class
     * @return array
     */
    protected static function getMutatorMethods($class)
    {
        preg_match_all('/(?<=^|;)get([^;]+?)Attribute(;|$)/', implode(';', get_class_methods($class)), $matches);

        return $matches[1];
    }

    /**
     * Get all of the "Attribute" return typed attribute mutator methods.
     *
     * @param  mixed  $class
     * @return array
     */
    protected static function getAttributeMarkedMutatorMethods($class)
    {
        $instance = is_object($class) ? $class : new $class;

        return Helper::collect((new ReflectionClass($instance))->getMethods())->filter(function ($method) use ($instance) {
            $returnType = $method->getReturnType();

            if ($returnType &&
                $returnType instanceof ReflectionNamedType &&
                $returnType->getName() === Attribute::class) {
                $method->setAccessible(true);

                if (is_callable($method->invoke($instance)->get)) {
                    return true;
                }
            }

            return false;
        })->map->name->values()->all();
    }
}