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

import grp
import json
import os
import pwd
import shutil
import stat
import subprocess
import hashlib
import datetime
import uuid


class Util:
    def __init__(self):
        super().__init__()

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

        try:
            if as_user is not None:
                command = 'su - {0} -c "{1}"'.format(as_user, command)
            process = subprocess.Popen(command, stdin=stdin, env=env, cwd=cwd, stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=shell)

            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 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_uid
            return grp.getgrgid(gid)[0]
        except:
            raise

    @staticmethod
    def install_with_gdebi(full_path):
        try:
            process = subprocess.Popen('gdebi -n ' + full_path, shell=True)
            process.wait()
        except:
            raise

    @staticmethod
    def install_with_apt_get(package_name):
        try:
            process = subprocess.Popen('apt-get install --yes --force-yes ' + package_name, shell=True)
            process.wait()
        except:
            raise

    @staticmethod
    def is_installed(package_name):

        result_code, p_out, p_err = Util.execute('dpkg -s {}'.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(fname):
        hash_md5 = hashlib.md5()
        with open(fname, '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 set_permission(path, permission_code):
        Util.execute('chmod {} {}'.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 install_package(package_name, package_version):
        command = "sudo apt-get --yes --force-yes install {0}={1}".format(package_name, package_version)
        result_code, p_out, p_err = Util.execute(command)
        return result_code, p_out, p_err