package manager

import (
	"encoding/json"
	"fmt"
	"log"
)

type SyncHandler struct {
	devices     map[string]*_device
	chanForSync map[string]chan map[string]interface{}
}

func compareMap(src map[string]interface{}, dst map[string]interface{}) bool {

	for key, value := range src {
		if key == "code" {
			continue
		}
		srcV, ok := value.(int)
		if !ok {
			srcV = int(value.(float64))
		}

		dstV, ok := dst[key].(int)
		if !ok {
			dstV = int(dst[key].(float64))
		}

		if srcV != dstV {
			fmt.Println("diff ", key, "] ", srcV, " vs ", dstV)
			return false
		}
	}

	return true
}

func (sh *SyncHandler) Handle(e Event) {

	device, ok := sh.devices[e.Key().(string)]
	// fmt.Println("sync] ", device.IfaceName)
	// fmt.Println(sh.devices)
	if !ok {
		return
	}

	params := e.Params()
	if params == nil {
		return
	}

	go func() {
		encoder := json.NewEncoder(device.Iface)
		origin := map[string]interface{}{}
		origin["code"] = 200
		for key, value := range params {
			origin[key] = value
		}

		// props := []string{"fan", "light", "servo"}

		err := encoder.Encode(origin)
		if err != nil {
			return
		}

		_, ok := sh.chanForSync[device.IfaceName]
		if ok {
			close(sh.chanForSync[device.IfaceName])
			delete(sh.chanForSync, device.IfaceName)
		}
		chanForSync := make(chan map[string]interface{})
		sh.chanForSync[device.IfaceName] = make(chan map[string]interface{})

		for state := range chanForSync {

			if compareMap(origin, state) {
				close(sh.chanForSync[device.IfaceName])
				delete(sh.chanForSync, device.IfaceName)
				return
			}
			log.Println("wrong: ", state)
			log.Println("resend: ", origin)
			err := encoder.Encode(origin)
			if err != nil {
				log.Println("sync routine is died")
				return
			}
		}
	}()
}

type RecvHandler struct {
	devices     map[interface{}]*_device
	chanForSync map[string]chan map[string]interface{}
	next        EventHandler
}

func (rh *RecvHandler) Handle(e Event) {
	device, ok := rh.devices[e.Key()]
	if !ok {
		return
	}

	param := e.Params()
	code, _ := param["code"].(float64)
	if int(code) == 100 {
		return
	}

	device.states = param
	channel, ok := rh.chanForSync[device.IfaceName]
	if ok {
		channel <- device.states
	}

	if rh.next != nil {
		rh.next.Handle(e)
	}

	// fmt.Println("recv] ", device.states)
}