package main

import (
	"html/template"
	"log"
	"net/http"
	"os"
	"strconv"

	"git.dm1sh.ru/dm1sh/gotemptracker/models"
)

func getEnv(name, default_val string) string {
	val := os.Getenv(name)

	if val == "" {
		return default_val
	}

	return val
}

var tmpl *template.Template

func indexHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method == http.MethodPost {
		strvalue := r.FormValue("value")

		value, err := strconv.ParseFloat(strvalue, 32)
		if err != nil {
			http.Error(w, "Expected floating point value", http.StatusBadRequest)
		}

		models.InsertMeasurement(value)
	}

	measurements, err := models.AllMeasurements()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	err = tmpl.Execute(w, measurements)
	if err != nil {
		log.Fatal(err)
	}
}

func main() {
	tmpl = template.Must(template.ParseFiles("index.gohtml"))

	err := models.InitDB(getEnv("DB_CONNECTION_STRING", "postgres://gotemptracker:gotemptracker@localhost:5432/gotemptracker?sslmode=disable"))
	if err != nil {
		log.Fatal(err)
	}

	http.HandleFunc("/", indexHandler)

	port := getEnv("PORT", "80")

	log.Printf("Listening on %s\n", port)

	if err := http.ListenAndServe(":"+port, nil); err != nil {
		log.Fatal(err)
	}
}