#!/usr/bin/env python3

import configparser
import lib.uis.config_ui  # only follow -c flag
import lib.validator
import lib.sqlitedb
import lib.System
import lib.UserExceptions
import sqlite3


if __name__ == "__main__":
    lib.uis.config_ui.argparser.description += " - Edit Tilde Users"
    ArgParser = lib.uis.config_ui.argparser
    ArgParser.add_argument('--user', type=str,
                           help='Tilde users name to edit', required=True)

    Mutually = ArgParser.add_mutually_exclusive_group()
    Mutually.add_argument('-r', '--remove', default=False, action="store_true",
                          help='Remove an approved/unapproved User from the system(and DB). Effectively purges him.',
                          required=False)
    Mutually.add_argument("--verify", default=True, action="store_false",
                          help="Turns off value checks",
                          required=False)

    ArgParser.add_argument('--sshpubkey', type=str, default=None,
                           help="Stores the new given SSH-Key in given user", required=False)
    ArgParser.add_argument('--name', type=str, default=None,
                           help="Sets the stored name of the given user")
    ArgParser.add_argument('--username', type=str, default=None,
                           help="Rename given User")
    ArgParser.add_argument('--email', type=str, default=None,
                           help="Set new email address for given user")
    ArgParser.add_argument('--status', type=int, default=None,
                           help="Set status of given user")
    args = ArgParser.parse_args()
    config = configparser.ConfigParser()
    config.read(args.config)
    try:
        db = config['DEFAULT']['applications_db']
        if not args.sshpubkey and not args.name and not args.username and not args.email and args.status is None \
                and not args.remove:
            print(f"Well, SOMETHING must be done with {args.user} ;-)")
            exit(1)
        if not lib.validator.checkUserInDB(args.user, db):
            print(f"User {args.user} doesn't exist in the database.")
            exit(1)
        DB = lib.sqlitedb.SQLitedb(db)
        Sysctl = lib.System.System()
        if not DB:
            print("Couldn't establish connection to database")
            exit(1)

        CurrentUser = DB.safequery("SELECT * FROM `applications` WHERE `username`=?", tuple([args.user]))[0]
        if args.remove:
            print(f"Removing {args.user} from the system and the database...")
            try:
                DB.removeApplicantFromDBperUsername(args.user)
                print(f"Purged from the DB")
                if CurrentUser["status"] == 1:
                    Sysctl.remove_user(args.user)
                    print(f"Purged from the system")
                else:
                    print(f"{args.user} wasn't approved before, therefore not deleting from system itself.")
            except lib.UserExceptions.General as e:
                print(f"{e}")
                exit(1)
            print("Success.")
            exit(0)
        if args.sshpubkey:
            if not lib.validator.checkSSHKey(args.sshpubkey):
                print(f"Pubkey {args.sshpubkey} isn't valid.")
                exit(1)
            try:
                DB.safequery("UPDATE `applications` SET `pubkey`=? WHERE `username`=?",
                             tuple([args.sshpubkey, args.user]))
            except sqlite3.Error as e:
                print(f"Something unexpected happened! {e}")
                exit(1)
            fetch = DB.safequery("SELECT * FROM `applications` WHERE `username` = ? ", tuple([args.user]))
            if int(fetch[0]["status"]) == 1:
                try:
                    Sysctl.make_ssh_usable(args.user, args.sshpubkey)
                except lib.UserExceptions.ModifyFilesystem as e:
                    print(f"One action failed during writing the ssh key back to the authorization file. {e}")
            print(f"{args.user} updated successfully.")

        if args.name:
            if not lib.validator.checkName(args.name):
                print(f"{args.name} is not a valid Name.")
                exit(1)
            try:
                DB.safequery("UPDATE `applications` SET `name` =? WHERE `username` =?", tuple([args.name, args.user]))
            except sqlite3.Error as e:
                print(f"Couldn't write {args.name} to database: {e}")
        if args.email:
            if not lib.validator.checkEmail(args.email):
                print(f"{args.email} is not a valid Mail address!")
                exit(1)
            try:
                DB.safequery("UPDATE `applications` SET `email` =? WHERE `username` =?", tuple([args.email]))
            except sqlite3.Error as e:
                print(f"Couldn't write {args.email} to the database. {e}")
        if args.status is not None:
            if args.status != 0 and args.status != 1:
                print("Only 0 and 1 are valid status, where 1 is activated and 0 is unapproved.")
                exit(0)
            # just takes first result out of the dict
            if args.status == int(CurrentUser["status"]):
                print(f"Old and new Status matches, didn't change")
            if args.status == 0 and int(CurrentUser["status"]) == 1:
                try:
                    DB.safequery("UPDATE `applications` SET `status` =? WHERE `id`=?",
                                 tuple([args.status, CurrentUser["id"]]))
                except sqlite3.Error as e:
                    print(f"Couldn't update database entry for {args.user}, didn't touch the system")
                    exit(1)
                try:
                    Sysctl.remove_user(args.user)
                except lib.UserExceptions.UnknownReturnCode as e:
                    print(f"Couldn't remove {args.user} from the system, unknown return code: {e}. DB is modified.")
                    exit(1)
            if args.status == 1 and int(CurrentUser["status"]) == 0:
                try:
                    DB.safequery("UPDATE `applications` SET `status`=? WHERE `username`=?",
                                 tuple([args.status, args.user]))
                except sqlite3.Error as e:
                    print(f"Couldn't update Users status in database")
                    exit(1)
                try:
                    Sysctl.register(args.user)
                    Sysctl.lock_user_pw(args.user)
                    Sysctl.add_to_usergroup(args.user)
                    Sysctl.make_ssh_usable(args.user, CurrentUser["pubkey"])
                except lib.UserExceptions.UserExistsAlready as UEA:
                    print(f"Somehow the user exists already on the system! {UEA}")
                    exit(1)
                except lib.UserExceptions.UnknownReturnCode as URC:
                    print(f"Unknown return code: {URC}")
                    exit(1)
                except lib.UserExceptions.SSHDirUncreatable as SDU:
                    print(f"Couldnt create ssh directory for {args.user}, exception: {SDU}")
                    exit(1)
                except lib.UserExceptions.ModifyFilesystem as MFS:
                    pass
        print(f"Success! {args.user}")
        exit(0)
    except KeyboardInterrupt as e:
        pass