module SctCore
  class Helper

    WINDOWS = "Windows"
    MAC_OS = "MacOS"
    UBUNTU = "Ubuntu"

    def self.to_hash(str)
      Hash[
        str.split("\n").map{|i|i.split('=')}
      ]
    end

    def self.operatingSystem
      proc = `uname -a`

      case proc.downcase
        when /microsoft/
          os = WINDOWS
        when /darwin/
          os = MAC_OS
        else
          os = UBUNTU
      end

      return os
    end

    def self.homePath
      user = ENV["SUDO_USER"] || ENV["USER"]

      if self.operatingSystem == MAC_OS
          home = "/Users"
      else
          home = "/home"
      end

      return "#{home}/#{user}"
    end

    def self.windowsHomePath
      if self.is_windows?
        return self.convertWindowsToWSLPath(`cmd.exe /c echo %userprofile%`)
      end

      return nil
    end

    def self.convertWindowsToWSLPath(path)
      if self.is_windows?
        return path.gsub(/C:\\/, '/mnt/c/').gsub(/\\\\/, "/").gsub(/\\/, '/').gsub(/\r\n?/, '')
      end

      return path
    end

    def self.convertWSLToWindowsPath(path)
      if self.is_windows?
        return path.gsub(/\/mnt\/c/, 'C:/').gsub(/\/\//, '/').gsub(/\\\\/, "/").gsub(/\r\n?/, '')
      end

      return path
    end

    def self.is_sudo?
      return !ENV["SUDO_USER"].nil? && !ENV["SUDO_USER"].empty?
    end

    def self.is_windows?
      return self.operatingSystem == WINDOWS
    end

    def self.is_windows_administrator?
      # https://serverfault.com/a/95464
      return `/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -c "(New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)"` == "True\r\n"
    end

    def self.ensure_sudo
      if !self.is_sudo?
        UI.error "This command needs to be run with sudo."
        exit 1
      end
    end

    def self.ensure_windows_administrator
      if self.is_windows? && !self.is_windows_administrator?
        UI.error "This command needs to be run in an admin shell."
        exit 1
      end
    end

    def self.ensure_permissions
      self.ensure_sudo
      self.ensure_windows_administrator
    end
  end
end