package core

import (
	"errors"
	"git.noahlan.cn/northlan/nnet/internal/log"
	"git.noahlan.cn/northlan/nnet/internal/packet"
)

type nNetRouter struct {
	handlers map[string]Handler
	notFound Handler
}

func NewRouter() Router {
	return &nNetRouter{
		handlers: make(map[string]Handler),
	}
}

func (r *nNetRouter) Handle(conn *Connection, p packet.IPacket) {
	pkg, ok := p.(*packet.Packet)
	if !ok {
		log.Error(packet.ErrWrongMessage)
		return
	}
	handler, ok := r.handlers[pkg.Header.Route]
	if !ok {
		if r.notFound == nil {
			log.Error("message handler not found")
			return
		}
		r.notFound.Handle(conn, p)
		return
	}
	handler.Handle(conn, p)
}

func (r *nNetRouter) Register(matches interface{}, handler Handler) error {
	route, ok := matches.(string)
	if !ok {
		return errors.New("the type of matches must be string")
	}
	r.handlers[route] = handler
	return nil
}

func (r *nNetRouter) SetNotFoundHandler(handler Handler) {
	r.notFound = handler
}