package assert

import "reflect"

// Nil asserts that the given value equals nil
func Nil(t test, value any) {
	if isNil(value) {
		return
	}

	t.Errorf(formatSingleValueMessage("Nil", value))
	t.FailNow()
}

// NotNil asserts that the given value does not equal nil
func NotNil(t test, value any) {
	if !isNil(value) {
		return
	}

	t.Errorf(formatSingleValueMessage("NotNil", value))
	t.FailNow()
}

// isNil returns true if the object is nil.
func isNil(object any) bool {
	if object == nil {
		return true
	}

	value := reflect.ValueOf(object)
	kind := value.Kind()

	switch kind {
	case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.UnsafePointer, reflect.Interface, reflect.Slice:
		return value.IsNil()
	}

	return false
}