package main

import (
  "os"
  "fmt"
  "net/url"
  "strings"
  "unicode"
)

func main() {
  if len(os.Args) == 1 {
    fmt.Printf("script download|list website|database\n")
  } else if os.Args[1] == "download" && len(os.Args) == 3 {
    content_type, name := defineWebsite(os.Args[2])
    fmt.Println("downloading", content_type, name)
  } else if os.Args[1] == "download" && len(os.Args) != 3 {
    fmt.Println("Download requires one argument")
  } else if os.Args[1] == "list" && len(os.Args) == 3 {
    content_type, name := defineWebsite(os.Args[2])
    fmt.Println("listing", content_type, name)
  } else if os.Args[1] == "list" && len(os.Args) != 3 {
    fmt.Println("List requires one argument")
  } else {
    fmt.Println("ingorrect argument", os.Args[1])
  }
}

func disambiguate(a string) (bool, string) { // true if website, false if db
  for _, r := range a {
    if unicode.IsLetter(r) {
      return true, a
    }
  }
  return false, a
}

func defineWebsite(a string) (string, string) {
  web, value := disambiguate(a)
  switch web {
  case true:
    switch strings.HasPrefix(value, "http://") || strings.HasPrefix(value, "https://") {
    case true:
      u, err := url.Parse(value)
      if err != nil {
        panic(err)
      }
      return "website", u.Host
    case false:
        return "website", value
    }
  case false:
    return "database", value
  }
  return "a", "b"
}