#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: Volkan Şahin <volkansah.in> <bm.volkansahin@gmail.com>

import datetime
import grp
import hashlib
import json
import os
import pwd
import shutil
import stat
import subprocess
import uuid
import locale
from base.scope import Scope
from os.path import expanduser


class Util:


    def __init__(self):
        super().__init__()
        scope = Scope().get_instance()

    @staticmethod
    def get_ask_path_file():
        return '/usr/share/ahenk/base/agreement/'

    @staticmethod
    def close_session(username):
        Util.execute('pkill -9 -u {0}'.format(username))

    @staticmethod
    def shutdown():
        Util.execute('reboot')

    @staticmethod
    def create_file(full_path):
        try:
            if os.path.exists(full_path):
                return None
            else:
                file = open(full_path, 'w')
                file.close()
                return True
        except:
            raise

    @staticmethod
    def delete_folder(full_path):
        try:
            shutil.rmtree(full_path)
        except:
            raise

    @staticmethod
    def delete_file(full_path):
        try:
            if Util.is_exist(full_path):
                os.remove(full_path)
        except:
            raise

    @staticmethod
    def rename_file(old_full_path, new_full_path):
        try:
            os.rename(old_full_path, new_full_path)
        except:
            raise

    @staticmethod
    def copy_file(source_full_path, destination_full_path):
        try:
            shutil.copy2(source_full_path, destination_full_path)
        except:
            raise

    @staticmethod
    def move(source_full_path, destination_full_path):
        try:
            shutil.move(source_full_path, destination_full_path)
        except:
            raise

    @staticmethod
    def get_size(full_path):
        # byte
        try:
            return os.path.getsize(full_path)
        except:
            raise

    @staticmethod
    def link_path(source_path, destination_path):
        try:
            os.symlink(source_path, destination_path)
        except:
            raise

    @staticmethod
    def read_file(full_path, mode='r'):
        content = None
        try:
            with open(full_path, mode) as f:
                content = f.read()
        except:
            raise
        finally:
            return content

    @staticmethod
    def read_file_by_line(full_path, mode='r'):
        line_list = list()
        with open(full_path, mode) as f:
            lines = f.readlines()
            for line in lines:
                line_list.append(line)
        return line_list

    @staticmethod
    def write_file(full_path, content, mode='w+'):
        file = None
        try:
            file = open(full_path, mode)
            file.write(content)
        except:
            raise
        finally:
            file.close()

    @staticmethod
    def make_executable(full_path):
        try:
            st = os.stat(full_path)
            os.chmod(full_path, st.st_mode | stat.S_IEXEC)
        except:
            raise

    @staticmethod
    def change_owner(full_path, user_name=None, group_name=None):
        try:
            shutil.chown(full_path, user_name, group_name)
        except:
            raise

    @staticmethod
    def get_executable_path(app_name):
        path = None
        try:
            path = shutil.which(app_name)
        except:
            raise
        finally:
            return path

    @staticmethod
    def execute(command, stdin=None, env=None, cwd=None, shell=True, result=True, as_user=None, ip=None):

        try:
            if ip:
                command = 'ssh root@{0} "{1}"'.format(ip, command)
                Scope.get_instance().get_logger().debug('Executing command: ' +str(command))

            elif as_user:
                command = 'su - {0} -c "{1}"'.format(as_user, command)
                Scope.get_instance().get_logger().debug('Executing command: ' +str(command))
            process = subprocess.Popen(command, stdin=stdin, env=env, cwd=cwd, stderr=subprocess.PIPE,
                                       stdout=subprocess.PIPE, shell=shell)

            Scope.get_instance().get_logger().debug('Executing command: ' + str(command))

            if result is True:
                result_code = process.wait()
                p_out = process.stdout.read().decode("unicode_escape")
                p_err = process.stderr.read().decode("unicode_escape")

                return result_code, p_out, p_err
            else:
                return None, None, None
        except Exception as e:
            return 1, 'Could not execute command: {0}. Error Message: {1}'.format(command, str(e)), ''

    @staticmethod
    def scopy_from_remote(source_path, destination_path, ip):
        command = 'scp -r root@' + ip + ':' + source_path + ' ' + destination_path
        process = subprocess.Popen(command,  stderr=subprocess.PIPE,stdout=subprocess.PIPE, shell=True)
        result_code = process.wait()
        p_out = process.stdout.read().decode("unicode_escape")
        p_err = process.stderr.read().decode("unicode_escape")

        return result_code, p_out, p_err

    @staticmethod
    def execute_script(script_path, parameters=None):
        command = []
        if os.path.exists(script_path):
            command.append(script_path)
        else:
            raise Exception('[Util] Script is required')
        if parameters is not None:
            for p in parameters:
                command.append(p)

        return subprocess.check_call(command)

    @staticmethod
    def is_exist(full_path):
        try:
            return os.path.exists(full_path)
        except:
            raise

    @staticmethod
    def create_directory(dir_path):
        try:
            return os.makedirs(dir_path)
        except:
            raise

    @staticmethod
    def string_to_json(string):
        try:
            return json.loads(string)
        except:
            raise

    # TODO json abilities


    @staticmethod
    def file_owner(full_path):
        try:
            st = os.stat(full_path)
            uid = st.st_uid
            return pwd.getpwuid(uid)[0]
        except:
            raise

    @staticmethod
    def file_group(full_path):
        try:
            st = os.stat(full_path)
            gid = st.st_gid
            # return grp.getgrgid(gid)[0]
            return gid
        except:
            raise

    @staticmethod
    def install_with_dpkg(full_path):
        command_dpkg = 'dpkg -i {0}'
        command_dep = 'apt -f install -y'
        commands = [command_dpkg.format(full_path),command_dep]
        for cmd in commands:
            try:
                process = subprocess.Popen(cmd, shell=True)
                process.wait()
            except:
                raise

    @staticmethod
    def install_with_apt_get(package_name, package_version=None):

        if package_version is not None:
            command = 'apt-get install --yes --force-yes {0}={1}'.format(package_name, package_version)
        else:
            command = 'apt-get install --yes --force-yes {0}'.format(package_name)

        return Util.execute(command)

    @staticmethod
    def uninstall_package(package_name, package_version=None):

        if package_version is not None:
            command = 'apt-get purge --yes --force-yes {0}={1}'.format(package_name, package_version)
        else:
            command = 'apt-get purge --yes --force-yes {0}'.format(package_name)

        return Util.execute(command)

    @staticmethod
    def is_installed(package_name):

        result_code, p_out, p_err = Util.execute('dpkg -s {0}'.format(package_name))
        try:
            lines = str(p_out).split('\n')
            for line in lines:
                if len(line) > 1:
                    if line.split(None, 1)[0].lower() == 'status:':
                        if 'installed' in line.split(None, 1)[1].lower():
                            return True
            return False
        except Exception as e:
            return False

    @staticmethod
    def get_md5_file(file_path):
        hash_md5 = hashlib.md5()
        with open(file_path, 'rb') as f:
            for chunk in iter(lambda: f.read(4096), b""):
                hash_md5.update(chunk)
        return str(hash_md5.hexdigest())

    @staticmethod
    def get_md5_text(content):
        hash_md5 = hashlib.md5()
        hash_md5.update(content.encode())
        return str(hash_md5.hexdigest())

    @staticmethod
    def timestamp():
        return str(datetime.datetime.now().strftime("%d-%m-%Y %I:%M"))

    @staticmethod
    def generate_uuid():
        return str(uuid.uuid4())

    @staticmethod
    def get_language():
        locale_info = locale.getdefaultlocale()
        return locale_info[0]

    @staticmethod
    def set_permission(path, permission_code):
        Util.execute('chmod -R {0} {1}'.format(permission_code, path))

    @staticmethod
    def has_attr_json(arg, attr_name):
        for j in json.loads(json.dumps(arg)):
            if attr_name in j:
                return True
        return False

    @staticmethod
    def remove_package(package_name, package_version):
        command = "sudo apt-get --yes --force-yes purge {0}={1}".format(package_name, package_version)
        result_code, p_out, p_err = Util.execute(command)
        return result_code, p_out, p_err

    @staticmethod
    def send_notify(title, body, display, user, icon=None, timeout=5000):
        inner_command = 'notify-send "{0}" "{1}" -t {2}'.format(title, body, timeout)
        if icon:
            inner_command += ' -i {0}'.format(icon)

        if user != 'root':
            Util.execute('export DISPLAY={0}; su - {1} -c \'{2}\''.format(display, user, inner_command))

    @staticmethod
    def show_message(username, display, message='', title=''):
        ask_path = Util.get_ask_path_file()+ 'confirm.py'
        Scope.get_instance().get_logger().debug('DISPLAYYYY --------->>>>>>>>: ' + str(display))
        if display is None:
            display_number = Util.get_username_display()
        else:
            display_number = display
        try:
            if Util.get_desktop_env() == "gnome":
                display_number = Util.get_username_display_gnome(username)
            if username is not None:
                command = 'su - {0} -c \'python3 {1} \"{2}\" \"{3}\" \"{4}\"\''.format(username, ask_path, message,
                                                                                       title, display_number)
                result_code, p_out, p_err = Util.execute(command)

                if p_out.strip() == 'Y':
                    return True
                elif p_out.strip() == 'N':
                    return False
                else:
                    return None
            else:
                return None
        except Exception as e :
            print("Error when showing message " + str(e))
            return None

    @staticmethod
    def show_registration_message(login_user_name, message, title, host=None):
        ask_path = Util.get_ask_path_file() + 'ahenkmessage.py'
        # display_number = ":0"
        display_number = Util.get_username_display()

        if Util.get_desktop_env() == "gnome":
            display_number = Util.get_username_display_gnome(login_user_name)

        if host is None:
            command = 'su - {0} -c \"python3 {1} \'{2}\' \'{3}\' \'{4}\' \"'.format(login_user_name,
                                                                                        ask_path, message, title, display_number)
        else:
            command = 'su - {0} -c \"python3 {1} \'{2}\' \'{3}\' \'{4}\' \'{5}\' \"'.format(login_user_name,
                                                                                                        ask_path,
                                                                                                        message, title,
                                                                                                        host, display_number)
        result_code, p_out, p_err = Util.execute(command)
        pout = str(p_out).replace('\n', '')
        return pout

    @staticmethod
    def show_unregistration_message(login_user_name,display_number,message,title):
        ask_path = Util.get_ask_path_file()+ 'unregistrationmessage.py'
        if Util.get_desktop_env() == "gnome":
            display_number = Util.get_username_display_gnome(login_user_name)

        command = 'su - {0} -c \"python3 {1} \'{2}\' \'{3}\' \'{4}\' \"'.format(login_user_name, ask_path, message, title, display_number)
        result_code, p_out, p_err = Util.execute(command)
        pout = str(p_out).replace('\n', '')
        return pout

    @staticmethod
    def get_username_display():
        result_code, p_out, p_err = Util.execute("who | awk '{print $1, $5}' | sed 's/(://' | sed 's/)//'", result=True)
        result = []
        lines = str(p_out).split('\n')
        for line in lines:
            arr = line.split(' ')
            if len(arr) > 1 and str(arr[1]).isnumeric() is True:
                result.append(line)

        params = str(result[0]).split(' ')
        display_number = params[1]
        display_number = ":"+str(display_number)
        return display_number

    @staticmethod
    def get_username_display_gnome(user):
        result_code, p_out, p_err = Util.execute("who | awk '{print $1, $5}' | sed 's/(://' | sed 's/)//'", result=True)
        display_number = None
        result = []
        lines = str(p_out).split('\n')
        for line in lines:
            arr = line.split(' ')
            if len(arr) > 1 and str(arr[1]).isnumeric() is True:
                result.append(line)
        for res in result:
            arr = res.split(" ")
            username = arr[0]
            if username == user:
                display_number = ":" + arr[1]
                # print("--->>> dis no: " + str(display_number))
        return display_number

    @staticmethod
    def get_desktop_env():
        xfce4_session = "/usr/bin/xfce4-session"
        gnome_session = "/usr/bin/gnome-session"
        desktop_env = None
        result_code, p_out, p_err = Util.execute("ls {}".format(gnome_session))
        if result_code == 0:
            desktop_env = "gnome"
        result_code, p_out, p_err = Util.execute("ls {}".format(xfce4_session))
        if result_code == 0:
            desktop_env = "xfce"
        return desktop_env

    # return home directory for user. "/home/username"
    @staticmethod
    def get_homedir(user):
        username = user
        try:
            return expanduser("~{0}".format(username))
        except:
            raise

    # return username from ahenk.db. if domain is not null return username is DOMAIN\\username
    @staticmethod
    def get_username():
        user_name = Scope.get_instance().get_db_service().select_one_result('session', 'username', " 1=1 order by id desc ")
        domain = Scope.get_instance().get_db_service().select_one_result('session', 'domain', " 1=1 order by id desc ")
        if domain:
            user_name = "{0}\\{1}".format(domain, user_name)
        return user_name

    # as_user is the user that run command. Return as_user for execute method. if domain is not null return as_user is DOMAIN\\\\username
    @staticmethod
    def get_as_user():
        as_user = Scope.get_instance().get_db_service().select_one_result('session', 'username', " 1=1 order by id desc ")
        domain = Scope.get_instance().get_db_service().select_one_result('session', 'domain', " 1=1 order by id desc ")
        if domain:
            as_user = "{0}\\\\{1}".format(domain, as_user)
        return as_user

    # return gid_number of username
    @staticmethod
    def get_gid_number(username):
        try:
            return pwd.getpwnam(username).pw_gid
        except:
            raise