from cement.core.controller import CementBaseController, expose
from cement.core import handler, hook
from wo.core.mysql import WOMysql
from wo.core.logging import Log
from wo.core.variables import WOVariables
from wo.core.aptget import WOAptGet
from wo.core.shellexec import WOShellExec
from wo.core.apt_repo import WORepo
import configparser
import os


class WOStackMigrateController(CementBaseController):
    class Meta:
        label = 'migrate'
        stacked_on = 'stack'
        stacked_type = 'nested'
        description = ('Migrate stack safely')
        arguments = [
            (['--mariadb'],
                dict(help="Migrate database to MariaDB",
                     action='store_true')),
        ]

    @expose(hide=True)
    def migrate_mariadb(self):
        # Backup all database
        WOMysql.backupAll(self)

        # Add MariaDB repo
        Log.info(self, "Adding repository for MariaDB, please wait...")

        mysql_pref = ("Package: *\nPin: origin sfo1.mirrors.digitalocean.com"
                      "\nPin-Priority: 1000\n")
        with open('/etc/apt/preferences.d/'
                  'MariaDB.pref', 'w') as mysql_pref_file:
            mysql_pref_file.write(mysql_pref)

        WORepo.add(self, repo_url=WOVariables.wo_mysql_repo)
        Log.debug(self, 'Adding key for {0}'
                  .format(WOVariables.wo_mysql_repo))
        WORepo.add_key(self, '0xcbcb082a1bb943db',
                       keyserver="keyserver.ubuntu.com")

        config = configparser.ConfigParser()
        if os.path.exists('/etc/mysql/conf.d/my.cnf'):
            config.read('/etc/mysql/conf.d/my.cnf')
        else:
            config.read(os.path.expanduser("~")+'/.my.cnf')

        try:
            chars = config['client']['password']
        except Exception as e:
            Log.error(self, "Error: process exited with error %s"
                            % e)

        Log.debug(self, "Pre-seeding MariaDB")
        Log.debug(self, "echo \"mariadb-server-10.3 "
                        "mysql-server/root_password "
                        "password \" | "
                        "debconf-set-selections")
        WOShellExec.cmd_exec(self, "echo \"mariadb-server-10.3 "
                                   "mysql-server/root_password "
                                   "password {chars}\" | "
                                   "debconf-set-selections"
                                   .format(chars=chars),
                                   log=False)
        Log.debug(self, "echo \"mariadb-server-10.3 "
                        "mysql-server/root_password_again "
                        "password \" | "
                        "debconf-set-selections")
        WOShellExec.cmd_exec(self, "echo \"mariadb-server-10.3 "
                                   "mysql-server/root_password_again "
                                   "password {chars}\" | "
                                   "debconf-set-selections"
                                   .format(chars=chars),
                                   log=False)

        # Install MariaDB
        apt_packages = WOVariables.wo_mysql

        Log.info(self, "Updating apt-cache, hang on...")
        WOAptGet.update(self)
        Log.info(self, "Installing MariaDB, hang on...")
        WOAptGet.remove(self, ["mysql-common", "libmysqlclient18"])
        WOAptGet.auto_remove(self)
        WOAptGet.install(self, apt_packages)

    @expose(hide=True)
    def default(self):
        if ((not self.app.pargs.mariadb)):
            self.app.args.print_help()
        if self.app.pargs.mariadb:
            if WOVariables.wo_mysql_host is not "localhost":
                Log.error(
                    self, "Remote MySQL server in use, skipping local install")

            if (WOShellExec.cmd_exec(self, "mysqladmin ping") and
                    (not WOAptGet.is_installed(self, 'mariadb-server'))):

                Log.info(self, "If your database size is big, "
                         "migration may take some time.")
                Log.info(self, "During migration non nginx-cached parts of "
                         "your site may remain down")
                start_migrate = input("Type \"mariadb\" to continue:")
                if start_migrate != "mariadb":
                    Log.error(self, "Not starting migration")
                self.migrate_mariadb()
            else:
                Log.error(self, "Your current MySQL is not alive or "
                          "you allready installed MariaDB")