package main

import (
  "fmt"
  "flag"
  "os"
  "time"
)

var (
  URI = "https://api.openweathermap.org/data/2.5"
  CONFIG = flag.String("config", "", "config file path")
  DAEMON = flag.Bool("daemon", false, "run in daemon mode")
  HELP   = flag.Bool("help", false, "print this help message")
)

func init() {
  flag.Parse()
}

func main() {
  var w Weather

  if *HELP {
    flag.PrintDefaults()
    os.Exit(1)
  }

  if *CONFIG == "" {
    fmt.Println("you must specify a config file with -config option")
    os.Exit(1)
  }

  err := w.Config.Load(*CONFIG)
  if err != nil {
    fmt.Printf("%s\n", err)
    os.Exit(2)
  }

  for {
    startTime := time.Now().Unix()

    w.FetchData()
    err = w.SendToInfluxDB()
    if err != nil {
      fmt.Printf("%s\n", err)
    }

    if *DAEMON == false {
      if err == nil {
        os.Exit(0)
      } else {
        os.Exit(2)
      }
    }

    sleepTime := time.Now().Unix() - startTime + w.Config.Interval
    if sleepTime > 0 {
      time.Sleep(time.Duration(sleepTime) * time.Second)
    }
  }
}