#! /usr/bin/python2 -E
# Authors: Ade Lee <alee@redhat.com>
#
# Copyright (C) 2014  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

from textwrap import dedent
from ipalib import api
from ipaplatform import services
from ipaplatform.paths import paths
from ipapython import admintool
from ipapython import dogtag
from ipapython import ipautil
from ipapython.dn import DN
from ipaserver.install import krainstance
from ipaserver.install import installutils
from ipaserver.install.installutils import create_replica_config
from ipaserver.install import dogtaginstance
from ipaserver.install import kra


class KRAInstall(admintool.AdminTool):

    command_name = 'ipa-kra-install'

    usage = "%prog [options] [replica_file]"

    description = "Install a master or replica KRA."

    @classmethod
    def add_options(cls, parser, debug_option=True):
        super(KRAInstall, cls).add_options(parser, debug_option=True)

        parser.add_option(
            "--no-host-dns", dest="no_host_dns", action="store_true",
            default=False,
            help="Do not use DNS for hostname lookup during installation")

        parser.add_option(
            "-p", "--password",
            dest="password", sensitive=True,
            help="Directory Manager (existing master) password")

        parser.add_option(
            "-U", "--unattended",
            dest="unattended", action="store_true", default=False,
            help="unattended installation never prompts the user")

        parser.add_option(
            "--uninstall",
            dest="uninstall", action="store_true", default=False,
            help="uninstall an existing installation. The uninstall can "
                 "be run with --unattended option")

    def validate_options(self, needs_root=True):
        super(KRAInstall, self).validate_options(needs_root=True)

        installutils.check_server_configuration()

        api.bootstrap(in_server=True)
        api.finalize()

    @classmethod
    def get_command_class(cls, options, args):
        if options.uninstall:
            return KRAUninstaller
        else:
            return KRAInstaller


class KRAUninstaller(KRAInstall):
    log_file_name = paths.IPASERVER_KRA_UNINSTALL_LOG

    def validate_options(self, needs_root=True):
        super(KRAUninstaller, self).validate_options(needs_root=True)

        if self.args:
            self.option_parser.error("Too many parameters provided.")

        dogtag_constants = dogtag.configured_constants(api)
        _kra = krainstance.KRAInstance(api, dogtag_constants=dogtag_constants)
        if not _kra.is_installed():
            self.option_parser.error(
                "Cannot uninstall.  There is no KRA installed on this system."
            )

    def run(self):
        super(KRAUninstaller, self).run()
        kra.uninstall(True)


class KRAInstaller(KRAInstall):
    log_file_name = paths.IPASERVER_KRA_INSTALL_LOG

    INSTALLER_START_MESSAGE = '''
        ===================================================================
        This program will setup Dogtag KRA for the FreeIPA Server.

    '''

    FAIL_MESSAGE = '''
        Your system may be partly configured.
        Run ipa-kra-install --uninstall to clean up.
    '''

    def validate_options(self, needs_root=True):
        super(KRAInstaller, self).validate_options(needs_root=True)

        if self.options.unattended and self.options.password is None:
            self.option_parser.error(
                "Directory Manager password must be specified using -p"
                " in unattended mode"
            )

        self.installing_replica = dogtaginstance.is_installing_replica("KRA")

        if self.installing_replica:
            if not self.args:
                self.option_parser.error("A replica file is required.")
            if len(self.args) > 1:
                self.option_parser.error("Too many arguments provided")

            self.replica_file = self.args[0]
            if not ipautil.file_exists(self.replica_file):
                self.option_parser.error(
                    "Replica file %s does not exist" % self.replica_file)
        else:
            if self.args:
                self.option_parser.error("Too many parameters provided.  "
                                         "No replica file is required.")

    def ask_for_options(self):
        super(KRAInstaller, self).ask_for_options()

        if not self.options.unattended and self.options.password is None:
            self.options.password = installutils.read_password(
                "Directory Manager", confirm=False,
                validate=False, retry=False)
            if self.options.password is None:
                raise admintool.ScriptError(
                    "Directory Manager password required")

    def _run(self):
        super(KRAInstaller, self).run()
        print dedent(self.INSTALLER_START_MESSAGE)

        if not self.installing_replica:
            replica_config = None
        else:
            replica_config = create_replica_config(
                self.options.password,
                self.replica_file,
                self.options)

        self.options.dm_password = self.options.password
        self.options.setup_ca = False

        api.Backend.ldap2.connect(bind_dn=DN('cn=Directory Manager'),
                                  bind_pw=self.options.dm_password)

        try:
            kra.install_check(api, replica_config, self.options)
        except RuntimeError as e:
            raise admintool.ScriptError(str(e))

        kra.install(api, replica_config, self.options)

        # Restart apache for new proxy config file
        services.knownservices.httpd.restart(capture_output=True)

    def run(self):
        try:
            self._run()
        except:
            self.log.error(dedent(self.FAIL_MESSAGE))
            raise