package main

import (
	"fmt"
	"github.com/imkira/go-observer"
	"net/http"
	"sirlab.de/go/knyc/handler"
	"strconv"
	"time"
)

type Value struct {
	value int
}

type Engine struct {
	payload observer.Property
}

var engine Engine

func (engine Engine) runEngine() {
	for {
		value := engine.payload.Value().(Value)
		fmt.Printf("sleep: %d\n", value.value)
		time.Sleep(1 * time.Second)
		value.value++
		engine.payload.Update(value)
	}
}

func syncFactory(payload observer.Property) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		refId, err := strconv.Atoi(r.URL.Query().Get("ref"))
		if err != nil {
			refId = -1
		}

		stream := payload.Observe()
		var value Value
		for {
			value = stream.Value().(Value)
			if value.value > refId {
				break
			}

			select {
			case <-stream.Changes():
				stream.Next()
			}
		}

		w.Header().Add("Content-Type", "text/plain")
		fmt.Fprintf(w, "%d (%d)\n", value.value, refId)
	}
}

func main() {
	app := handler.NewAuthMux()
	http.Handle("/", app)

	app.PublicHandleFunc("/__intern__/exit", handler.Exit)

	payload := observer.NewProperty(Value{value: 19})
	sync := syncFactory(payload)
	app.PublicHandleFunc("/sync", sync)

	// hanlde login page
	fsHandler := http.FileServer(http.Dir("../client/dist/"))

	// default handler
	app.PublicHandle("/", fsHandler)

	engine.payload = payload
	go engine.runEngine()

	// start listening
	fmt.Println("http://localhost:32039")
	http.ListenAndServe(":32039", nil)
}