from sys import *
import platform
import os
import subprocess
import shutil
import fileinput


class Colors:
    if (platform.system() == "Windows"):
         ERROR = ''
         END = ''
         LOG_BLUE = ''
    else:
         ERROR = '\033[91m'
         END = '\033[0m'
         LOG_BLUE = '\033[94m'

def replacePatternInFile(pattern, replace, file_path):
    try:

        with fileinput.FileInput(file_path, inplace=True, backup='.bak') as file:
            for line in file:
                print(line.replace(pattern, replace), end='')
    except:
        stderr.write(Colors.ERROR + "ERROR !: replacement in file failed !" + Colors.END + "\r\n")
        return 1
    return 0



def install_dependency_ubuntu(command, mode):
    #
    ##install dependency then check the return code
    #

    old = command
    if (mode == 'i'):
        command = 'apt-get install ' + command
    elif (mode == 'u'):
        command = 'apt-get update'
    elif (mode == 'a'):
        command = 'add-apt-repository ' + command
    process = subprocess.Popen(command, shell=True)
    process.wait()
    if process.returncode != 0:
        stderr.write(Colors.ERROR + "ERROR !: installation of " + old + " failed !" + Colors.END + "\r\n")


def install_required_ubuntu():
    install_dependency_ubuntu("update", 'u')
    install_dependency_ubuntu("python-lxml", 'i')
    install_dependency_ubuntu("libxml2-dev", 'i')
    install_dependency_ubuntu("libxslt-dev", 'i')
    install_dependency_ubuntu("zlib1g-dev", 'i')
    install_dependency_ubuntu("update", 'u')
    install_dependency_ubuntu("rabbitmq-server", 'i')
    #install_dependency_ubuntu("libmysqlclient-dev", 'i')


def install_dependency_centos(command, mode):
    #
    ##install dependency then check the return code
    #
    old = command
    if (mode == 'i'):
        command = 'yum -y install ' + command
    elif (mode == 'u'):
        command = 'yum update ' + command
    process = subprocess.Popen(command, shell=True)
    process.wait()
    if process.returncode != 0:
        stderr.write(Colors.ERROR + "ERROR !: installation of " + old + " failed !" + Colors.END + "\r\n")


def install_required_centos():
    install_dependency_centos("yum", 'u')
    install_dependency_centos("kernel", 'u')
    install_dependency_centos("", 'u')
    install_dependency_centos("libxml2", 'i')
    install_dependency_centos("libxslt libxslt-2", 'i')
    install_dependency_centos("libxslt-devel libxml2-devel", 'i')
    install_dependency_centos("rabbitmq-server", 'i')
    install_dependency_centos("mariadb-server", 'i')
    install_dependency_centos("mariadb", 'i')
    install_dependency_centos("mariadb-devel", 'i')

    process = subprocess.Popen("systemctl start mariadb.service", shell=True)
    process.wait()
    if process.returncode != 0:
        stderr.write(Colors.ERROR + "ERROR !" + Colors.END + "\r\n")

    process = subprocess.Popen("systemctl enable mariadb.service", shell=True)
    process.wait()
    if process.returncode != 0:
        stderr.write(Colors.ERROR + "ERROR !" + Colors.END + "\r\n")

    process = subprocess.Popen("mysql_secure_installation", shell=True)
    process.wait()
    if process.returncode != 0:
        stderr.write(Colors.ERROR + "ERROR !" + Colors.END + "\r\n")


def install_required():
    # checking if user is sudo then install the needed dependencies
    # find the linux distribution and call the related function
    distribution = platform.dist()
    if not 'SUDO_UID' in os.environ.keys():
        stderr.write("Super user rights are needed to install prerequisites\r\n")
        exit(1)
    if distribution[0] == "Ubuntu" or distribution[0] == "Debian":
        install_required_ubuntu()
    elif distribution[0] == "centos":
        install_required_centos()
    else:
        print("Requirements are made for Ubuntu, Debian and CentOS only")
        exit(1)


def install_python_modules(venv):
    if 'SUDO_UID' in os.environ.keys():
        answer = input(
            "You are about to install your virtualenv only for root, this is discouraged, are you sure ? (Y/N) If you are not sure relaunch the script without super user privileges\n")
        while (answer != 'Y' and answer != 'y' and answer != 'n' and answer != 'N'):
            answer = input(
                "You are about to install your virtualenv only for root, this is discouraged, are you sure ? (Y/N) \n")
        if (answer not in ['y', 'Y']):
            exit(1)

    if (os.path.basename(os.getcwd())!= "private"):
        if not(os.path.isdir("../private")):
            print(Colors.LOG_BLUE + "-----------------------------Creating \'private\' directory-----------------------------" + Colors.END)
            os.mkdir("../private")
        print(Colors.LOG_BLUE + "-----------------------------cd private-----------------------------" + Colors.END)
        os.chdir("../private")
    #
    ## deleting if already exist then creating the venv
    #

    while (True):
        try:
            if (os.path.isdir(venv)):
                print(Colors.LOG_BLUE + "-----------------------------Deleting existing venv-----------------------------" + Colors.END)
                shutil.rmtree(venv)
            break
        except:
            continue


    #
    ## update of tools and installation of dependencies in REQUIREMENTS.txt or REQUIREMENTS_WINDOWS.txt
    #

    end_of_line = '\n\n'
    python = 'python3'
    pip = '/bin/pip'
    
    REQUIREMENTS = 'REQUIREMENTS.txt'
    sql_user = "pyros"
    sql_pswd = "DjangoPyros"
    req = "CREATE DATABASE IF NOT EXISTS pyros;  CREATE DATABASE IF NOT EXISTS pyros_test; CREATE USER IF NOT EXISTS pyros; GRANT USAGE ON *.* TO 'pyros'; DROP USER 'pyros'; GRANT ALL ON pyros.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros'; GRANT ALL ON test_pyros.* TO 'pyros'@'localhost'; GRANT ALL PRIVILEGES ON test_pyros_test.* TO 'pyros'@'localhost'; GRANT ALL ON pyros_test.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros'"
    req_centos = "CREATE DATABASE IF NOT EXISTS pyros; CREATE DATABASE IF NOT EXISTS pyros_test; GRANT USAGE ON *.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros' WITH GRANT OPTION; DROP USER 'pyros'@'localhost'; GRANT ALL ON pyros.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros'; GRANT ALL PRIVILEGES ON pyros.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros' WITH GRANT OPTION;  GRANT ALL PRIVILEGES ON pyros_test.* TO pyros@localhost IDENTIFIED BY 'DjangoPyros' WITH GRANT OPTION;"
    if platform.dist()[0] == "centos":
        req = req_centos
    sql_request="\"" + req + "\"" + " | mysql -u root -p"
    if (platform.system() == "Windows"):
        end_of_line = "\r\n\r\n"
        python = 'py'
        pip = '\Scripts\pip'
        REQUIREMENTS = 'REQUIREMENTS_WINDOWS.txt'
        sql_request=req + " |\"C:\Program Files\MySQL\MySQL Server 5.7\\bin\mysql\" -u root -p"
    
    print(Colors.LOG_BLUE + "-----------------------------Creating venv " + venv + "-----------------------------"+end_of_line + Colors.END)
    os.system(python+" -m venv " + venv)
    print(Colors.LOG_BLUE + "-----------------------------Installing python packages via pip-----------------------------" + Colors.END)
    os.system(venv + '\Scripts\python -m pip install --upgrade pip')
    os.system(venv + pip+' install --upgrade wheel')
    os.system(venv + pip+' install --upgrade setuptools')
    if (platform.system() == "Windows"):
        if (platform.machine() == "x86"):
            os.system(venv + '\Scripts\pip install ../install\windows\lxml-4.1.1-cp36-cp36m-win32.whl')
        else:
            os.system(venv + '\Scripts\pip install ../install\windows\lxml-4.1.1-cp36-cp36m-win_amd64.whl')
    os.system(venv + pip+' install -r ../install' + os.sep + REQUIREMENTS)
    print(Colors.LOG_BLUE + "-----------------------------cd ../install-----------------------------" + Colors.END)
    os.chdir("../install")
    
    #
    ## creating database and creating and granting user pyros
    #


    print(Colors.LOG_BLUE + end_of_line+"-----------------------------Launching mysql to create database and create and grant user pyros-----------------------------" + Colors.END)
    print(Colors.LOG_BLUE +"-----------------------------Please enter your MYSQL root password-----------------------------" + Colors.END)
    process = subprocess.Popen("echo " + sql_request, shell=True)
    process.wait()
    if (process.returncode != 0):
        stderr.write(Colors.ERROR + "ERROR !: db configuration failed !" + Colors.END + "\r\n")
        return -1
    print(Colors.LOG_BLUE + end_of_line+"-----------------------------Database created and user pyros successfully created and granted-----------------------------" + Colors.END)

    #
    ## replacing pattern in settings.py to use mysql
    #
    print(Colors.LOG_BLUE + "-----------------------------setting MYSQL = True in settings-----------------------------" + Colors.END)
    replacePatternInFile("MYSQL = False", "MYSQL = True", os.path.normpath("../src/pyros/settings.py"))
    if (platform.system() == "Windows"):
        #
        ## moving voeventparse in site-packages directory
        #
        try:
            site_packages = "..\private\\venv_py3_pyros\Lib\site-packages\\"
            if (not os.path.isdir(site_packages + "voevent_parse-0.9.5.dist-info") and
            not os.path.isdir(site_packages + "voeventparse")):
                print(Colors.LOG_BLUE + "\r\n\r\n-----------------------------Copying the voevent library in Lib/site-packages-----------------------------" + Colors.END)
                process = subprocess.Popen("xcopy /i /y windows\\voeventparse " + site_packages + "voeventparse")
                process.wait()
                if (process.returncode != 0):raise Exception
                process = subprocess.Popen("xcopy /i /y windows\\voevent_parse-0.9.5.dist-info " + site_packages + "voevent_parse-0.9.5.dist-info")
                process.wait()
                if (process.returncode != 0): raise Exception

                print(Colors.LOG_BLUE + "\r\n-----------------------------library successfully copied-----------------------------" + Colors.END)
        except Exception as e:
            print(Colors.ERROR + "ERROR while Copying the voevent library in Lib/site-packages" + Colors.END, file=stderr)
            return False


    print(Colors.LOG_BLUE + "\r\n-----------------------------cd ..-----------------------------" + Colors.END)
    os.chdir("..")

    #
    ##  Executing migrations
    #

    print(Colors.LOG_BLUE + "\r\n\r\n-----------------------------Migrate : executing pyros.py init_database-----------------------------" + Colors.END)
    try:
        process = subprocess.Popen(python + " pyros.py init_database"  , shell=True)
        process.wait()
    except Exception as e:
        print(Colors.ERROR + "Error while initialising database :" + Colors.END)
        return -1


    print(Colors.LOG_BLUE + "\r\n\r\n-----------------------------Install successfull !-----------------------------" + Colors.END)
    return 0

def _help():
    print(
        "Welcome in the installation script of the pyros venv.\t\nPlease launch it from the install directory of pyros.\n\tIf you're on Ubuntu Debian or CentOS:\n\tlaunch it with sudo and <--prerequisites> or <-p> to install the prerequisites.\n\t-->sudo ./test_install.py -p\n\n\tFor the python packages launch it from the install directory of pyros without sudo and without parameter\n\t-->./test_install.py")


if __name__ == '__main__':
    if (len(argv) > 1):
        if argv[1] == "--prerequisites" or argv[1] == "-p":
            install_required()
        else:
            _help()
    elif len(argv) == 1:
        install_python_modules("venv_py3_pyros")
    else:
        _help()