package budget2

type Instance struct {
	ID    int                    `json:"i"`
	Value map[string]interface{} `json:"v"`
	Cache map[string]interface{} `json:"-"`
}
type Interface interface {
	Name(context *Context) string
	DefaultValue() map[string]interface{}
	ControlNames(context *Context) []string
	Controls(i Interface, context *Context) []Control
	GetValue(i Interface, name string, context *Context) interface{}
	GetControl(name string, context *Context) *Control
	Handle(i Interface, context *Context, name string, typ string, value interface{}) error
}

type Object struct {
}

func (Object) Name(context *Context) string {
	return ""
}

func (Object) DefaultValue() map[string]interface{} {
	return map[string]interface{}{}
}

func (Object) ControlNames(context *Context) []string {
	return []string{}
}

func (Object) Controls(i Interface, context *Context) []Control {
	controls := make([]Control, 0)
	for _, name := range i.ControlNames(context) {
		control := i.GetControl(name, context)
		if control != nil {
			controls = append(controls, *control)
		}
	}
	return controls
}

func (Object) GetValue(i Interface, name string, context *Context) interface{} {
	if value, ok := context.CurrentInstance().Value[name]; ok {
		return value
	}
	if value, ok := i.DefaultValue()[name]; ok {
		context.CurrentInstance().Value[name] = value
		return value
	}
	if value, ok := context.CurrentInstance().Cache[name]; ok {
		context.CurrentInstance().Value[name] = value
		return value
	}
	return nil
}

func (Object) GetControl(name string, context *Context) *Control {
	return nil
}

func (Object) Handle(i Interface, context *Context, name string, typ string, value interface{}) error {
	control := i.GetControl(name, context)
	if control != nil {
		context.CurrentInstance().Value[name] = control.Handle(typ, value, context)
	}
	return nil
}