package ecgo

import (
	"reflect"
)

// IMiddleware 中间件接口
type IMiddleware interface {
	Next()
	Handler()
	append(next interface{})
	wrapper(wrapper *Wrapper)
}

// Middleware 中间件对象
type Middleware struct {
	*Wrapper
	next interface{}
}

// 指定下一个
func (m *Middleware) append(next interface{}) {
	m.next = next
}

// 包装器
func (m *Middleware) wrapper(wrapper *Wrapper) {
	m.Wrapper = wrapper
}

// Next 调用下一个中间件
func (m *Middleware) Next() {
	switch o := m.next.(type) {
	case IMiddleware:
		o.Handler()
	case IController:
		v := reflect.ValueOf(o)
		mn := v.Elem().FieldByName("action").String()
		v.MethodByName(mn).Call(nil)
	case func(w *Wrapper):
		o(m.Wrapper)
	default:
		panic("Router Closure Error")
	}
}

// 统一入口
type entranceMiddleware struct {
	*Middleware
}

func (m *entranceMiddleware) Handler() {
	m.Next()
}