#!/usr/local/bin/gentee

const : URL = "https://wttr.in/"
const : URLV2 = "https://v2.wttr.in/"
const : URLV3 = "https://v3.wttr.in/"
const : MOONURL = "https://wttr.in/moon@"

func dirs() arr.str {
  arr.str res = {
    GetEnv("HOME")+"/.config/wttr/default-city.txt",
    GetEnv("HOME")+"/.wttr",
  }
  return res
}

func help() str {
  return Format(`
Usage: wttr <region>
  -v2
    Use v2 (%s)
  -v3
    Use v3 (%s)
  -m
    display moon (%s)
  -c
    Use metric units
  -f
    Use imperial units
  -t -today
    Display today's weather
  `,
  URLV2,
  URLV3,
  MOONURL,
)
}

func request(str url) str {
  map empty
  map headers = {"User-Agent":"curl/7.87"}
  return HTTPRequest(url, "GET", empty, headers)
}

run {
  if IsArg("h") || IsArg("help") {
    Println(help())
    return
  }
  str loc = Arg("")
  str url = URL
  for fl in dirs() {
    if ExistFile(fl): loc = TrimSpace(ReadFile(fl)); break;
  }
  if IsArg("v2"): url = URLV2
  if IsArg("v3"): url = URLV3
  if IsArg("m"): url = MOONURL
  switch Arg("")
    case "":
    default: loc = Arg("")
  switch loc
    case "": url = url + "?"
    default: url = url + loc +"?"
  if IsArg("c"):  url = url + "&m"
  if IsArg("f"):   url = url + "&u"
  if (IsArg("t")||IsArg("today")):  url = url + "&1n"
  Run(`head`,"-n","-1", stdin: buf(request(url)))
}