#! /usr/bin/env python3

import os, sys, subprocess

class nfs_server_conf:
    def __init__(self, nfs_srv_folders = ["/nfsroot/publicnfs","/nfsroot/datennfs"]) -> None:
        if not os.geteuid()==0:
            raise PermissionError("Sie sind kein Root")
        self.nfs_srv_folders = nfs_srv_folders

    def mount_serverfolder(self):
        for srv_folder in self.nfs_srv_folders:
            unit_mount_file = "/etc/systemd/system/" + os.path.basename(srv_folder) + ".mount"
            mountfile = os.path.basename(unit_mount_file)
            #mount Verzeichnis anlegen
            if os.path.exists(srv_folder):
                print("Das Verzeichnis", srv_folder,"ist bereits vorhanden !")
            else:
                os.makedirs(srv_folder, mode=1777)

            if os.path.exists(unit_mount_file) is True:
                print("Die Unit", unit_mount_file, "existiert bereits !", sep=" ")
            else:
                with open(unit_mount_file, "w") as unit_file:
                    print("""[Unit]\nDescription=Mount nfs Server Share\n[Mount]\nWhat={srv_folder}\nWhere={srv_point}\nType=None\nOptions=bind\n[Install]\nWantedBy=multi-user.target""".format(
                        srv_folder=srv_folder,
                        srv_point="/" + os.path.basename(srv_folder)), file=unit_file)
                    if subprocess.run(['systemctl', 'daemon-reload']) .returncode == 0:
                        print("Systemed daemon-reload wurde ausgeführt")
                    else:
                         raise "Reloade konnte nicht ausgeführt werden."
            #Starte UnitFile         
            if subprocess.run(['systemctl', 'start', mountfile]).returncode == 0:
                print(mountfile, "wurde gestartet !", sep=" ")
            else:
                raise "Service" + mountfile +" konnte nicht gestart werden"
                                                
                
    def nfs_server_conf(self):
        with open("/etc/exports",'r') as exportfs_file:
            for exportfs_line in map(str(exportfs_file.readlines()).rstrip("\n")):
                print(exportfs_line)
                #print(exportfs_line.rstrip("\n"), sep="")


    def nfs_con_user(self):
        pass

    def start_nfs_server(self):
        pass
    
    def main(self):
        nfs_server_conf.mount_serverfolder(self)
        nfs_server_conf.nfs_server_conf(self)

    def __str__(self) -> str:
        pass

if __name__ == "__main__":
    my_nfs_server = nfs_server_conf()
    my_nfs_server.main()