package main

import (
	"fmt"
	"log"
	"net/http"
)

const addr = ":9090"

type humidityHandler struct {
	humidity Record[float32]
}

func newHumidityHandler() humidityHandler {
	return humidityHandler{newRecord[float32]()}
}

func (h *humidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		h.get(w, r)
	case http.MethodPost:
		h.post(w, r)
	default:
		w.WriteHeader(http.StatusMethodNotAllowed)
		fmt.Fprintf(w, "invalid method: '%s'", r.Method)
	}
}

func (h *humidityHandler) get(w http.ResponseWriter, r *http.Request) {
	c := make(chan float32)
	h.humidity.getRecent <- c
	humidity, ok := <-c
	if !ok {
		w.WriteHeader(http.StatusGone)
		fmt.Fprintf(w, "no humidity data stored on server")
		return
	}
	fmt.Fprintf(w, "%f", humidity)
}

func (h *humidityHandler) post(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusNotImplemented)
}

func main() {
	http.Handle("/humidity", new(humidityHandler))
	fmt.Printf("Listening on %s...\n", addr)
	log.Fatal(http.ListenAndServe(addr, nil))
}