import os, subprocess
import win32api, win32con

def _getProgramFilesDir():    
    k = r'SOFTWARE\Microsoft\Windows\CurrentVersion'
    h = win32api.RegOpenKeyEx(win32con.HKEY_LOCAL_MACHINE, k, 0, win32con.KEY_READ)
    return win32api.RegQueryValueEx(h, 'ProgramFilesDir')[0]

def install(language):
    
    # uninstall old version
    uninstall = r'%s\nvu\unins000.exe' % _getProgramFilesDir()
    if os.path.exists(uninstall):
        res = subprocess.call([uninstall, '/silent'])
        if res < 0:
            return res

    # install new version    
    return subprocess.call(['Nvu_En_1.0.exe', '/silent /norestart'])

"""
procedure InstallNvu(AExeName, AFlags : String);
var
  Path : string;
  ResultCode:Integer;
begin
  // UnInstall Old version
  Path :=  AddBackslash(ExpandConstant('{pf}'))+'Nvu\';
  Exec(Path+'unins000.exe', '/silent', Path,
       {ShowCmd: Integer}1, {Wait}ewWaitUntilTerminated, {var ResultCode: Integer}ResultCode){: Boolean};
  // Install New version
  Execute(AExeName, AFlags);
end;
"""

if __name__=='__main__':
    install('en')