# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
"""cubicweb-ctl commands and command handlers specific to the repository"""

__docformat__ = 'restructuredtext en'

# *ctl module should limit the number of import to be imported as quickly as
# possible (for cubicweb-ctl reactivity, necessary for instance for usable bash
# completion). So import locally in command helpers.
import sys
import os
import logging
import subprocess

from logilab.common import nullobject
from logilab.common.configuration import Configuration, merge_options
from logilab.common.shellutils import ASK, generate_password

from cubicweb import AuthenticationError, ExecutionError, ConfigurationError
from cubicweb.toolsutils import Command, CommandHandler, underline_title
from cubicweb.cwctl import CWCTL, check_options_consistency, ConfigureInstanceCommand
from cubicweb.server import SOURCE_TYPES
from cubicweb.server.repository import Repository
from cubicweb.server.serverconfig import (
    USER_OPTIONS, ServerConfiguration, SourceConfiguration,
    ask_source_config, generate_source_config)

# utility functions ###########################################################

def source_cnx(source, dbname=None, special_privs=False, interactive=True):
    """open and return a connection to the system database defined in the
    given server.serverconfig
    """
    from getpass import getpass
    from logilab.database import get_connection, get_db_helper
    dbhost = source.get('db-host')
    if dbname is None:
        dbname = source['db-name']
    driver = source['db-driver']
    dbhelper = get_db_helper(driver)
    if interactive:
        print '-> connecting to %s database' % driver,
        if dbhost:
            print '%s@%s' % (dbname, dbhost),
        else:
            print dbname,
    if dbhelper.users_support:
        if not interactive or (not special_privs and source.get('db-user')):
            user = source.get('db-user', os.environ.get('USER', ''))
            if interactive:
                print 'as', user
            password = source.get('db-password')
        else:
            print
            if special_privs:
                print 'WARNING'
                print ('the user will need the following special access rights '
                       'on the database:')
                print special_privs
                print
            default_user = source.get('db-user', os.environ.get('USER', ''))
            user = raw_input('Connect as user ? [%r]: ' % default_user)
            user = user.strip() or default_user
            if user == source.get('db-user'):
                password = source.get('db-password')
            else:
                password = getpass('password: ')
    else:
        user = password = None
    extra_args = source.get('db-extra-arguments')
    extra = extra_args and {'extra_args': extra_args} or {}
    cnx = get_connection(driver, dbhost, dbname, user, password=password,
                         port=source.get('db-port'),
                         **extra)
    try:
        cnx.logged_user = user
    except AttributeError:
        # C object, __slots__
        from logilab.database import _SimpleConnectionWrapper
        cnx = _SimpleConnectionWrapper(cnx)
        cnx.logged_user = user
    return cnx

def system_source_cnx(source, dbms_system_base=False,
                      special_privs='CREATE/DROP DATABASE', interactive=True):
    """shortcut to get a connextion to the instance system database
    defined in the given config. If <dbms_system_base> is True,
    connect to the dbms system database instead (for task such as
    create/drop the instance database)
    """
    if dbms_system_base:
        from logilab.database import get_db_helper
        system_db = get_db_helper(source['db-driver']).system_database()
        return source_cnx(source, system_db, special_privs=special_privs,
                          interactive=interactive)
    return source_cnx(source, special_privs=special_privs,
                      interactive=interactive)

def _db_sys_cnx(source, special_privs, interactive=True):
    """return a connection on the RDMS system table (to create/drop a user or a
    database)
    """
    import logilab.common as lgp
    from logilab.database import get_db_helper
    lgp.USE_MX_DATETIME = False
    driver = source['db-driver']
    helper = get_db_helper(driver)
    # connect on the dbms system base to create our base
    cnx = system_source_cnx(source, True, special_privs=special_privs,
                            interactive=interactive)
    # disable autocommit (isolation_level(1)) because DROP and
    # CREATE DATABASE can't be executed in a transaction
    set_isolation_level = getattr(cnx, 'set_isolation_level', None)
    if set_isolation_level is not None:
        # set_isolation_level() is psycopg specific
        set_isolation_level(0)
    return cnx

def repo_cnx(config):
    """return a in-memory repository and a repoapi connection to it"""
    from cubicweb import repoapi
    from cubicweb.server.utils import manager_userpasswd
    try:
        login = config.default_admin_config['login']
        pwd = config.default_admin_config['password']
    except KeyError:
        login, pwd = manager_userpasswd()
    while True:
        try:
            repo = repoapi.get_repository(config=config)
            cnx = repoapi.connect(repo, login, password=pwd)
            return repo, cnx
        except AuthenticationError:
            print '-> Error: wrong user/password.'
            # reset cubes else we'll have an assertion error on next retry
            config._cubes = None
        login, pwd = manager_userpasswd()


# repository specific command handlers ########################################

class RepositoryCreateHandler(CommandHandler):
    cmdname = 'create'
    cfgname = 'repository'

    def bootstrap(self, cubes, automatic=False, inputlevel=0):
        """create an instance by copying files from the given cube and by asking
        information necessary to build required configuration files
        """
        config = self.config
        if not automatic:
            print underline_title('Configuring the repository')
            config.input_config('email', inputlevel)
            # ask for pyro configuration if pyro is activated and we're not
            # using a all-in-one config, in which case this is done by the web
            # side command handler
            if config.pyro_enabled() and config.name != 'all-in-one':
                config.input_config('pyro', inputlevel)
            print '\n'+underline_title('Configuring the sources')
        sourcesfile = config.sources_file()
        # hack to make Method('default_instance_id') usable in db option defs
        # (in native.py)
        sconfig = SourceConfiguration(config,
                                      options=SOURCE_TYPES['native'].options)
        if not automatic:
            sconfig.input_config(inputlevel=inputlevel)
            print
        sourcescfg = {'system': sconfig}
        if automatic:
            # XXX modify a copy
            password = generate_password()
            print '-> set administrator account to admin / %s' % password
            USER_OPTIONS[1][1]['default'] = password
            sconfig = Configuration(options=USER_OPTIONS)
        else:
            sconfig = Configuration(options=USER_OPTIONS)
            sconfig.input_config(inputlevel=inputlevel)
        sourcescfg['admin'] = sconfig
        config.write_sources_file(sourcescfg)
        # remember selected cubes for later initialization of the database
        config.write_bootstrap_cubes_file(cubes)

    def postcreate(self, automatic=False, inputlevel=0):
        if automatic:
            CWCTL.run(['db-create', '--automatic', self.config.appid])
        elif ASK.confirm('Run db-create to create the system database ?'):
            CWCTL.run(['db-create', '--config-level', str(inputlevel),
                       self.config.appid])
        else:
            print ('-> nevermind, you can do it later with '
                   '"cubicweb-ctl db-create %s".' % self.config.appid)

ERROR = nullobject()

def confirm_on_error_or_die(msg, func, *args, **kwargs):
    try:
        return func(*args, **kwargs)
    except Exception as ex:
        print 'ERROR', ex
        if not ASK.confirm('An error occurred while %s. Continue anyway?' % msg):
            raise ExecutionError(str(ex))
    return ERROR

class RepositoryDeleteHandler(CommandHandler):
    cmdname = 'delete'
    cfgname = 'repository'

    def cleanup(self):
        """remove instance's configuration and database"""
        from logilab.database import get_db_helper
        source = self.config.system_source_config
        dbname = source['db-name']
        helper = get_db_helper(source['db-driver'])
        if ASK.confirm('Delete database %s ?' % dbname):
            if source['db-driver'] == 'sqlite':
                if confirm_on_error_or_die(
                    'deleting database file %s' % dbname,
                    os.unlink, source['db-name']) is not ERROR:
                    print '-> database %s dropped.' % dbname
                return
            user = source['db-user'] or None
            cnx = confirm_on_error_or_die('connecting to database %s' % dbname,
                                          _db_sys_cnx, source, 'DROP DATABASE')
            if cnx is ERROR:
                return
            cursor = cnx.cursor()
            try:
                if confirm_on_error_or_die(
                    'dropping database %s' % dbname,
                    cursor.execute, 'DROP DATABASE "%s"' % dbname) is not ERROR:
                    print '-> database %s dropped.' % dbname
                # XXX should check we are not connected as user
                if user and helper.users_support and \
                       ASK.confirm('Delete user %s ?' % user, default_is_yes=False):
                    if confirm_on_error_or_die(
                        'dropping user %s' % user,
                        cursor.execute, 'DROP USER %s' % user) is not ERROR:
                        print '-> user %s dropped.' % user
                cnx.commit()
            except BaseException:
                cnx.rollback()
                raise


class RepositoryStartHandler(CommandHandler):
    cmdname = 'start'
    cfgname = 'repository'

    def start_server(self, config):
        command = ['cubicweb-ctl', 'start-repository']
        if config.debugmode:
            command.append('--debug')
        command.append('--loglevel')
        command.append(config['log-threshold'].lower())
        command.append(config.appid)
        subprocess.call(command)
        return 1


class RepositoryStopHandler(CommandHandler):
    cmdname = 'stop'
    cfgname = 'repository'

    def poststop(self):
        """if pyro is enabled, ensure the repository is correctly unregistered
        """
        if self.config.pyro_enabled():
            from cubicweb.server.repository import pyro_unregister
            pyro_unregister(self.config)


# repository specific commands ################################################

def createdb(helper, source, dbcnx, cursor, **kwargs):
    if dbcnx.logged_user != source['db-user']:
        helper.create_database(cursor, source['db-name'], source['db-user'],
                               source['db-encoding'], **kwargs)
    else:
        helper.create_database(cursor, source['db-name'],
                               dbencoding=source['db-encoding'], **kwargs)

class CreateInstanceDBCommand(Command):
    """Create the system database of an instance (run after 'create').

    You will be prompted for a login / password to use to connect to
    the system database.  The given user should have almost all rights
    on the database (ie a super user on the DBMS allowed to create
    database, users, languages...).

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'db-create'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('automatic',
         {'short': 'a', 'action' : 'store_true',
          'default': False,
          'help': 'automatic mode: never ask and use default answer to every '
          'question. this may require that your login match a database super '
          'user (allowed to create database & all).',
          }),
        ('config-level',
         {'short': 'l', 'type' : 'int', 'metavar': '<level>',
          'default': 0,
          'help': 'configuration level (0..2): 0 will ask for essential '
          'configuration parameters only while 2 will ask for all parameters',
          }),
        ('create-db',
         {'short': 'c', 'type': 'yn', 'metavar': '<y or n>',
          'default': True,
          'help': 'create the database (yes by default)'
          }),
        )

    def run(self, args):
        """run the command with its specific arguments"""
        from logilab.database import get_db_helper
        check_options_consistency(self.config)
        automatic = self.get('automatic')
        appid = args.pop()
        config = ServerConfiguration.config_for(appid)
        source = config.system_source_config
        dbname = source['db-name']
        driver = source['db-driver']
        helper = get_db_helper(driver)
        if driver == 'sqlite':
            if os.path.exists(dbname) and (
                automatic or
                ASK.confirm('Database %s already exists. Drop it?' % dbname)):
                os.unlink(dbname)
        elif self.config.create_db:
            print '\n'+underline_title('Creating the system database')
            # connect on the dbms system base to create our base
            dbcnx = _db_sys_cnx(source, 'CREATE/DROP DATABASE and / or USER',
                                interactive=not automatic)
            cursor = dbcnx.cursor()
            try:
                if helper.users_support:
                    user = source['db-user']
                    if not helper.user_exists(cursor, user) and (automatic or \
                           ASK.confirm('Create db user %s ?' % user, default_is_yes=False)):
                        helper.create_user(source['db-user'], source.get('db-password'))
                        print '-> user %s created.' % user
                if dbname in helper.list_databases(cursor):
                    if automatic or ASK.confirm('Database %s already exists -- do you want to drop it ?' % dbname):
                        cursor.execute('DROP DATABASE "%s"' % dbname)
                    else:
                        print ('you may want to run "cubicweb-ctl db-init '
                               '--drop %s" manually to continue.' % config.appid)
                        return
                createdb(helper, source, dbcnx, cursor)
                dbcnx.commit()
                print '-> database %s created.' % dbname
            except BaseException:
                dbcnx.rollback()
                raise
        cnx = system_source_cnx(source, special_privs='CREATE LANGUAGE',
                                interactive=not automatic)
        cursor = cnx.cursor()
        helper.init_fti_extensions(cursor)
        cnx.commit()
        # postgres specific stuff
        if driver == 'postgres':
            # install plpythonu/plpgsql languages
            langs = ('plpythonu', 'plpgsql')
            for extlang in langs:
                if automatic or ASK.confirm('Create language %s ?' % extlang):
                    try:
                        helper.create_language(cursor, extlang)
                    except Exception as exc:
                        print '-> ERROR:', exc
                        print '-> could not create language %s, some stored procedures might be unusable' % extlang
                        cnx.rollback()
                    else:
                        cnx.commit()
        print '-> database for instance %s created and necessary extensions installed.' % appid
        print
        if automatic:
            CWCTL.run(['db-init', '--automatic', '--config-level', '0',
                       config.appid])
        elif ASK.confirm('Run db-init to initialize the system database ?'):
            CWCTL.run(['db-init', '--config-level',
                       str(self.config.config_level), config.appid])
        else:
            print ('-> nevermind, you can do it later with '
                   '"cubicweb-ctl db-init %s".' % config.appid)


class InitInstanceCommand(Command):
    """Initialize the system database of an instance (run after 'db-create').

    Notice this will be done using user specified in the sources files, so this
    user should have the create tables grant permissions on the database.

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'db-init'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('automatic',
         {'short': 'a', 'action' : 'store_true',
          'default': False,
          'help': 'automatic mode: never ask and use default answer to every '
          'question.',
          }),
        ('config-level',
         {'short': 'l', 'type': 'int', 'default': 1,
          'help': 'level threshold for questions asked when configuring '
          'another source'
          }),
        ('drop',
         {'short': 'd', 'action': 'store_true',
          'default': False,
          'help': 'insert drop statements to remove previously existant '
          'tables, indexes... (no by default)'
          }),
        )

    def run(self, args):
        check_options_consistency(self.config)
        print '\n'+underline_title('Initializing the system database')
        from cubicweb.server import init_repository
        from logilab.database import get_connection
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        try:
            system = config.system_source_config
            extra_args = system.get('db-extra-arguments')
            extra = extra_args and {'extra_args': extra_args} or {}
            get_connection(
                system['db-driver'], database=system['db-name'],
                host=system.get('db-host'), port=system.get('db-port'),
                user=system.get('db-user') or '', password=system.get('db-password') or '',
                **extra)
        except Exception as ex:
            raise ConfigurationError(
                'You seem to have provided wrong connection information in '\
                'the %s file. Resolve this first (error: %s).'
                % (config.sources_file(), str(ex).strip()))
        init_repository(config, drop=self.config.drop)
        if not self.config.automatic:
            while ASK.confirm('Enter another source ?', default_is_yes=False):
                CWCTL.run(['add-source', '--config-level',
                           str(self.config.config_level), config.appid])


class AddSourceCommand(Command):
    """Add a data source to an instance.

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'add-source'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('config-level',
         {'short': 'l', 'type': 'int', 'default': 1,
          'help': 'level threshold for questions asked when configuring another source'
          }),
        )

    def run(self, args):
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        config.quick_start = True
        repo, cnx = repo_cnx(config)
        with cnx:
            used = set(n for n, in cnx.execute('Any SN WHERE S is CWSource, S name SN'))
            cubes = repo.get_cubes()
            while True:
                type = raw_input('source type (%s): '
                                    % ', '.join(sorted(SOURCE_TYPES)))
                if type not in SOURCE_TYPES:
                    print '-> unknown source type, use one of the available types.'
                    continue
                sourcemodule = SOURCE_TYPES[type].module
                if not sourcemodule.startswith('cubicweb.'):
                    # module names look like cubes.mycube.themodule
                    sourcecube = SOURCE_TYPES[type].module.split('.', 2)[1]
                    # if the source adapter is coming from an external component,
                    # ensure it's specified in used cubes
                    if not sourcecube in cubes:
                        print ('-> this source type require the %s cube which is '
                               'not used by the instance.')
                        continue
                break
            while True:
                sourceuri = raw_input('source identifier (a unique name used to '
                                      'tell sources apart): ').strip()
                if not sourceuri:
                    print '-> mandatory.'
                else:
                    sourceuri = unicode(sourceuri, sys.stdin.encoding)
                    if sourceuri in used:
                        print '-> uri already used, choose another one.'
                    else:
                        break
            # XXX configurable inputlevel
            sconfig = ask_source_config(config, type, inputlevel=self.config.config_level)
            cfgstr = unicode(generate_source_config(sconfig), sys.stdin.encoding)
            cnx.create_entity('CWSource', name=sourceuri,
                              type=unicode(type), config=cfgstr)
            cnx.commit()


class GrantUserOnInstanceCommand(Command):
    """Grant a database user on a repository system database.

    <instance>
      the identifier of the instance
    <user>
      the database's user requiring grant access
    """
    name = 'db-grant-user'
    arguments = '<instance> <user>'
    min_args = max_args = 2
    options = (
        ('set-owner',
         {'short': 'o', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 'Set the user as tables owner if yes (no by default).'}
         ),
        )
    def run(self, args):
        """run the command with its specific arguments"""
        from cubicweb.server.sqlutils import sqlexec, sqlgrants
        appid, user = args
        config = ServerConfiguration.config_for(appid)
        source = config.system_source_config
        set_owner = self.config.set_owner
        cnx = system_source_cnx(source, special_privs='GRANT')
        cursor = cnx.cursor()
        schema = config.load_schema()
        try:
            sqlexec(sqlgrants(schema, source['db-driver'], user,
                              set_owner=set_owner), cursor)
        except Exception as ex:
            cnx.rollback()
            import traceback
            traceback.print_exc()
            print '-> an error occurred:', ex
        else:
            cnx.commit()
            print '-> rights granted to %s on instance %s.' % (appid, user)


class ResetAdminPasswordCommand(Command):
    """Reset the administrator password.

    <instance>
      the identifier of the instance
    """
    name = 'reset-admin-pwd'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('password',
         {'short': 'p', 'type' : 'string', 'metavar' : '<new-password>',
          'default' : None,
          'help': 'Use this password instead of prompt for one.\n'
                  '/!\ THIS IS AN INSECURE PRACTICE /!\ \n'
                  'the password will appear in shell history'}
         ),
        )

    def run(self, args):
        """run the command with its specific arguments"""
        from cubicweb.server.utils import crypt_password, manager_userpasswd
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        sourcescfg = config.read_sources_file()
        try:
            adminlogin = sourcescfg['admin']['login']
        except KeyError:
            print '-> Error: could not get cubicweb administrator login.'
            sys.exit(1)
        cnx = source_cnx(sourcescfg['system'])
        driver = sourcescfg['system']['db-driver']
        from logilab.database import get_db_helper
        dbhelper = get_db_helper(driver)
        cursor = cnx.cursor()
        # check admin exists
        cursor.execute("SELECT * FROM cw_CWUser WHERE cw_login=%(l)s",
                       {'l': adminlogin})
        if not cursor.fetchall():
            print ("-> error: admin user %r specified in sources doesn't exist "
                   "in the database" % adminlogin)
            print "   fix your sources file before running this command"
            cnx.close()
            sys.exit(1)
        if self.config.password is None:
            # ask for a new password
            msg = 'new password for %s' % adminlogin
            _, pwd = manager_userpasswd(adminlogin, confirm=True, passwdmsg=msg)
        else:
            pwd = self.config.password
        try:
            cursor.execute("UPDATE cw_CWUser SET cw_upassword=%(p)s WHERE cw_login=%(l)s",
                           {'p': dbhelper.binary_value(crypt_password(pwd)), 'l': adminlogin})
            sconfig = Configuration(options=USER_OPTIONS)
            sconfig['login'] = adminlogin
            sconfig['password'] = pwd
            sourcescfg['admin'] = sconfig
            config.write_sources_file(sourcescfg)
        except Exception as ex:
            cnx.rollback()
            import traceback
            traceback.print_exc()
            print '-> an error occurred:', ex
        else:
            cnx.commit()
            print '-> password reset, sources file regenerated.'
        cnx.close()


class StartRepositoryCommand(Command):
    """Start a CubicWeb RQL server for a given instance.

    The server will be remotely accessible through pyro or ZMQ

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'start-repository'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('debug',
         {'short': 'D', 'action' : 'store_true',
          'help': 'start server in debug mode.'}),
        ('loglevel',
         {'short': 'l', 'type' : 'choice', 'metavar': '<log level>',
          'default': None, 'choices': ('debug', 'info', 'warning', 'error'),
          'help': 'debug if -D is set, error otherwise',
          }),
        ('address',
         {'short': 'a', 'type': 'string', 'metavar': '<protocol>://<host>:<port>',
          'default': '',
          'help': ('specify a ZMQ URI on which to bind, or use "pyro://"'
                   'to create a pyro-based repository'),
          }),
        )

    def create_repo(self, config):
        address = self['address']
        if not address:
            address = config.get('zmq-repository-address') or 'pyro://'
        if address.startswith('pyro://'):
            from cubicweb.server.server import RepositoryServer
            return RepositoryServer(config), config['host']
        else:
            from cubicweb.server.utils import TasksManager
            from cubicweb.server.cwzmq import ZMQRepositoryServer
            repo = Repository(config, TasksManager())
            return ZMQRepositoryServer(repo), address

    def run(self, args):
        from logilab.common.daemon import daemonize, setugid
        from cubicweb.cwctl import init_cmdline_log_threshold
        appid = args[0]
        debug = self['debug']
        if sys.platform == 'win32' and not debug:
            logger = logging.getLogger('cubicweb.ctl')
            logger.info('Forcing debug mode on win32 platform')
            debug = True
        config = ServerConfiguration.config_for(appid, debugmode=debug)
        init_cmdline_log_threshold(config, self['loglevel'])
        # create the server
        server, address = self.create_repo(config)
        # ensure the directory where the pid-file should be set exists (for
        # instance /var/run/cubicweb may be deleted on computer restart)
        pidfile = config['pid-file']
        piddir = os.path.dirname(pidfile)
        # go ! (don't daemonize in debug mode)
        if not os.path.exists(piddir):
            os.makedirs(piddir)
        if not debug and daemonize(pidfile, umask=config['umask']):
            return
        uid = config['uid']
        if uid is not None:
            setugid(uid)
        server.install_sig_handlers()
        server.connect(address)
        server.run()


def _remote_dump(host, appid, output, sudo=False):
    # XXX generate unique/portable file name
    from datetime import date
    filename = '%s-%s.tgz' % (appid, date.today().strftime('%Y-%m-%d'))
    dmpcmd = 'cubicweb-ctl db-dump -o /tmp/%s %s' % (filename, appid)
    if sudo:
        dmpcmd = 'sudo %s' % (dmpcmd)
    dmpcmd = 'ssh -t %s "%s"' % (host, dmpcmd)
    print dmpcmd
    if os.system(dmpcmd):
        raise ExecutionError('Error while dumping the database')
    if output is None:
        output = filename
    cmd = 'scp %s:/tmp/%s %s' % (host, filename, output)
    print cmd
    if os.system(cmd):
        raise ExecutionError('Error while retrieving the dump at /tmp/%s' % filename)
    rmcmd = 'ssh -t %s "rm -f /tmp/%s"' % (host, filename)
    print rmcmd
    if os.system(rmcmd) and not ASK.confirm(
        'An error occurred while deleting remote dump at /tmp/%s. '
        'Continue anyway?' % filename):
        raise ExecutionError('Error while deleting remote dump at /tmp/%s' % filename)


def _local_dump(appid, output, format='native'):
    config = ServerConfiguration.config_for(appid)
    config.quick_start = True
    mih = config.migration_handler(connect=False, verbosity=1)
    mih.backup_database(output, askconfirm=False, format=format)
    mih.shutdown()

def _local_restore(appid, backupfile, drop, format='native'):
    config = ServerConfiguration.config_for(appid)
    config.verbosity = 1 # else we won't be asked for confirmation on problems
    config.quick_start = True
    mih = config.migration_handler(connect=False, verbosity=1)
    mih.restore_database(backupfile, drop, askconfirm=False, format=format)
    repo = mih.repo_connect()
    # version of the database
    dbversions = repo.get_versions()
    mih.shutdown()
    if not dbversions:
        print "bad or missing version information in the database, don't upgrade file system"
        return
    # version of installed software
    eversion = dbversions['cubicweb']
    status = instance_status(config, eversion, dbversions)
    # * database version > installed software
    if status == 'needsoftupgrade':
        print "** The database of %s is more recent than the installed software!" % config.appid
        print "** Upgrade your software, then migrate the database by running the command"
        print "** 'cubicweb-ctl upgrade %s'" % config.appid
        return
    # * database version < installed software, an upgrade will be necessary
    #   anyway, just rewrite vc.conf and warn user he has to upgrade
    elif status == 'needapplupgrade':
        print "** The database of %s is older than the installed software." % config.appid
        print "** Migrate the database by running the command"
        print "** 'cubicweb-ctl upgrade %s'" % config.appid
        return
    # * database version = installed software, database version = instance fs version
    #   ok!

def instance_status(config, cubicwebapplversion, vcconf):
    cubicwebversion = config.cubicweb_version()
    if cubicwebapplversion > cubicwebversion:
        return 'needsoftupgrade'
    if cubicwebapplversion < cubicwebversion:
        return 'needapplupgrade'
    for cube in config.cubes():
        try:
            softversion = config.cube_version(cube)
        except ConfigurationError:
            print '-> Error: no cube version information for %s, please check that the cube is installed.' % cube
            continue
        try:
            applversion = vcconf[cube]
        except KeyError:
            print '-> Error: no cube version information for %s in version configuration.' % cube
            continue
        if softversion == applversion:
            continue
        if softversion > applversion:
            return 'needsoftupgrade'
        elif softversion < applversion:
            return 'needapplupgrade'
    return None


class DBDumpCommand(Command):
    """Backup the system database of an instance.

    <instance>
      the identifier of the instance to backup
      format [[user@]host:]appname
    """
    name = 'db-dump'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('output',
         {'short': 'o', 'type' : 'string', 'metavar' : '<file>',
          'default' : None,
          'help': 'Specify the backup file where the backup will be stored.'}
         ),
        ('sudo',
         {'short': 's', 'action' : 'store_true',
          'default' : False,
          'help': 'Use sudo on the remote host.'}
         ),
        ('format',
         {'short': 'f', 'default': 'native', 'type': 'choice',
          'choices': ('native', 'portable'),
          'help': '"native" format uses db backend utilities to dump the database. '
                  '"portable" format uses a database independent format'}
         ),
        )

    def run(self, args):
        appid = args[0]
        if ':' in appid:
            host, appid = appid.split(':')
            _remote_dump(host, appid, self.config.output, self.config.sudo)
        else:
            _local_dump(appid, self.config.output, format=self.config.format)




class DBRestoreCommand(Command):
    """Restore the system database of an instance.

    <instance>
      the identifier of the instance to restore
    """
    name = 'db-restore'
    arguments = '<instance> <backupfile>'
    min_args = max_args = 2

    options = (
        ('no-drop',
         {'short': 'n', 'action' : 'store_true', 'default' : False,
          'help': 'for some reason the database doesn\'t exist and so '
          'should not be dropped.'}
         ),
        ('format',
         {'short': 'f', 'default': 'native', 'type': 'choice',
          'choices': ('native', 'portable'),
          'help': 'the format used when dumping the database'}),
        )

    def run(self, args):
        appid, backupfile = args
        if self.config.format == 'portable':
            # we need to ensure a DB exist before restoring from portable format
            if not self.config.no_drop:
                try:
                    CWCTL.run(['db-create', '--automatic', appid])
                except SystemExit as exc:
                    # continue if the command exited with status 0 (success)
                    if exc.code:
                        raise
        _local_restore(appid, backupfile,
                       drop=not self.config.no_drop,
                       format=self.config.format)
        if self.config.format == 'portable':
            try:
                CWCTL.run(['db-rebuild-fti', appid])
            except SystemExit as exc:
                if exc.code:
                    raise


class DBCopyCommand(Command):
    """Copy the system database of an instance (backup and restore).

    <src-instance>
      the identifier of the instance to backup
      format [[user@]host:]appname

    <dest-instance>
      the identifier of the instance to restore
    """
    name = 'db-copy'
    arguments = '<src-instance> <dest-instance>'
    min_args = max_args = 2
    options = (
        ('no-drop',
         {'short': 'n', 'action' : 'store_true',
          'default' : False,
          'help': 'For some reason the database doesn\'t exist and so '
          'should not be dropped.'}
         ),
        ('keep-dump',
         {'short': 'k', 'action' : 'store_true',
          'default' : False,
          'help': 'Specify that the dump file should not be automatically removed.'}
         ),
        ('sudo',
         {'short': 's', 'action' : 'store_true',
          'default' : False,
          'help': 'Use sudo on the remote host.'}
         ),
        ('format',
         {'short': 'f', 'default': 'native', 'type': 'choice',
          'choices': ('native', 'portable'),
          'help': '"native" format uses db backend utilities to dump the database. '
                  '"portable" format uses a database independent format'}
         ),
        )

    def run(self, args):
        import tempfile
        srcappid, destappid = args
        fd, output = tempfile.mkstemp()
        os.close(fd)
        if ':' in srcappid:
            host, srcappid = srcappid.split(':')
            _remote_dump(host, srcappid, output, self.config.sudo)
        else:
            _local_dump(srcappid, output, format=self.config.format)
        _local_restore(destappid, output, not self.config.no_drop,
                       self.config.format)
        if self.config.keep_dump:
            print '-> you can get the dump file at', output
        else:
            os.remove(output)


class CheckRepositoryCommand(Command):
    """Check integrity of the system database of an instance.

    <instance>
      the identifier of the instance to check
    """
    name = 'db-check'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('checks',
         {'short': 'c', 'type' : 'csv', 'metavar' : '<check list>',
          'default' : ('entities', 'relations',
                       'mandatory_relations', 'mandatory_attributes',
                       'metadata', 'schema', 'text_index'),
          'help': 'Comma separated list of check to run. By default run all \
checks, i.e. entities, relations, mandatory_relations, mandatory_attributes, \
metadata, text_index and schema.'}
         ),

        ('autofix',
         {'short': 'a', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 'Automatically correct integrity problems if this option \
is set to "y" or "yes", else only display them'}
         ),
        ('reindex',
         {'short': 'r', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 're-indexes the database for full text search if this \
option is set to "y" or "yes" (may be long for large database).'}
         ),
        ('force',
         {'short': 'f', 'action' : 'store_true',
          'default' : False,
          'help': 'don\'t check instance is up to date.'}
         ),

        )

    def run(self, args):
        from cubicweb.server.checkintegrity import check
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        config.repairing = self.config.force
        repo, cnx = repo_cnx(config)
        with cnx:
            check(repo, cnx,
                  self.config.checks, self.config.reindex, self.config.autofix)


class RebuildFTICommand(Command):
    """Rebuild the full-text index of the system database of an instance.

    <instance> [etype(s)]
      the identifier of the instance to rebuild

    If no etype is specified, cubicweb will reindex everything, otherwise
    only specified etypes will be considered.
    """
    name = 'db-rebuild-fti'
    arguments = '<instance>'
    min_args = 1

    def run(self, args):
        from cubicweb.server.checkintegrity import reindex_entities
        appid = args.pop(0)
        etypes = args or None
        config = ServerConfiguration.config_for(appid)
        repo, cnx = repo_cnx(config)
        with cnx:
            reindex_entities(repo.schema, cnx._cnx, etypes=etypes)
            cnx.commit()


class SynchronizeSourceCommand(Command):
    """Force a source synchronization.

    <instance>
      the identifier of the instance
    <source>
      the name of the source to synchronize.
    """
    name = 'source-sync'
    arguments = '<instance> <source>'
    min_args = max_args = 2

    def run(self, args):
        config = ServerConfiguration.config_for(args[0])
        config.global_set_option('log-file', None)
        config.log_format = '%(levelname)s %(name)s: %(message)s'
        logger = logging.getLogger('cubicweb.sources')
        logger.setLevel(logging.INFO)
        # only retrieve cnx to trigger authentication, close it right away
        repo, cnx = repo_cnx(config)
        cnx.close()
        try:
            source = repo.sources_by_uri[args[1]]
        except KeyError:
            raise ExecutionError('no source named %r' % args[1])
        session = repo.internal_session()
        stats = source.pull_data(session, force=True, raise_on_error=True)
        for key, val in stats.iteritems():
            if val:
                print key, ':', val



def permissionshandler(relation, perms):
    from yams.schema import RelationDefinitionSchema
    from yams.buildobjs import DEFAULT_ATTRPERMS
    from cubicweb.schema import (PUB_SYSTEM_ENTITY_PERMS, PUB_SYSTEM_REL_PERMS,
                                 PUB_SYSTEM_ATTR_PERMS, RO_REL_PERMS, RO_ATTR_PERMS)
    defaultrelperms = (DEFAULT_ATTRPERMS, PUB_SYSTEM_REL_PERMS,
                       PUB_SYSTEM_ATTR_PERMS, RO_REL_PERMS, RO_ATTR_PERMS)
    defaulteperms = (PUB_SYSTEM_ENTITY_PERMS,)
    # canonicalize vs str/unicode
    for p in ('read', 'add', 'update', 'delete'):
        rule = perms.get(p)
        if rule:
            perms[p] = tuple(str(x) if isinstance(x, basestring) else x
                             for x in rule)
    return perms, perms in defaultrelperms or perms in defaulteperms


class SchemaDiffCommand(Command):
    """Generate a diff between schema and fsschema description.

    <instance>
      the identifier of the instance
    <diff-tool>
      the name of the diff tool to compare the two generated files.
    """
    name = 'schema-diff'
    arguments = '<instance> <diff-tool>'
    min_args = max_args = 2

    def run(self, args):
        from yams.diff import schema_diff
        appid = args.pop(0)
        diff_tool = args.pop(0)
        config = ServerConfiguration.config_for(appid)
        repo, cnx = repo_cnx(config)
        cnx.close()
        fsschema = config.load_schema(expand_cubes=True)
        schema_diff(fsschema, repo.schema, permissionshandler, diff_tool, ignore=('eid',))


for cmdclass in (CreateInstanceDBCommand, InitInstanceCommand,
                 GrantUserOnInstanceCommand, ResetAdminPasswordCommand,
                 StartRepositoryCommand,
                 DBDumpCommand, DBRestoreCommand, DBCopyCommand,
                 AddSourceCommand, CheckRepositoryCommand, RebuildFTICommand,
                 SynchronizeSourceCommand, SchemaDiffCommand,
                 ):
    CWCTL.register(cmdclass)

# extend configure command to set options in sources config file ###############

db_options = (
    ('db',
     {'short': 'd', 'type' : 'named', 'metavar' : 'key1:value1,key2:value2',
      'default': None,
      'help': 'set <key> to <value> in "source" configuration file.',
      }),
    )

ConfigureInstanceCommand.options = merge_options(
        ConfigureInstanceCommand.options + db_options)

configure_instance = ConfigureInstanceCommand.configure_instance
def configure_instance2(self, appid):
    configure_instance(self, appid)
    if self.config.db is not None:
        appcfg = ServerConfiguration.config_for(appid)
        srccfg = appcfg.read_sources_file()
        for key, value in self.config.db.iteritems():
            try:
                srccfg['system'][key] = value
            except KeyError:
                raise ConfigurationError('unknown configuration key "%s" for source' % key)
        admcfg = Configuration(options=USER_OPTIONS)
        admcfg['login'] = srccfg['admin']['login']
        admcfg['password'] = srccfg['admin']['password']
        srccfg['admin'] = admcfg
        appcfg.write_sources_file(srccfg)
ConfigureInstanceCommand.configure_instance = configure_instance2