#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

# Interactive shell based on Django:
#
# Copyright (c) 2005, the Lawrence Journal-World
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     1. Redistributions of source code must retain the above copyright notice,
#        this list of conditions and the following disclaimer.
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


"""
  CLI interface for nova management.
"""

import gettext
import logging
import os
import sys
import time

import IPy

# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
    sys.path.insert(0, possible_topdir)

gettext.install('nova', unicode=1)

from nova import context
from nova import db
from nova import exception
from nova import flags
from nova import quota
from nova import utils
from nova.auth import manager
from nova.cloudpipe import pipelib


FLAGS = flags.FLAGS
flags.DECLARE('fixed_range', 'nova.network.manager')
flags.DECLARE('num_networks', 'nova.network.manager')
flags.DECLARE('network_size', 'nova.network.manager')
flags.DECLARE('vlan_start', 'nova.network.manager')
flags.DECLARE('vpn_start', 'nova.network.manager')


class VpnCommands(object):
    """Class for managing VPNs."""

    def __init__(self):
        self.manager = manager.AuthManager()
        self.pipe = pipelib.CloudPipe()

    def list(self):
        """Print a listing of the VPNs for all projects."""
        print "%-12s\t" % 'project',
        print "%-20s\t" % 'ip:port',
        print "%s" % 'state'
        for project in self.manager.get_projects():
            print "%-12s\t" % project.name,

            try:
                s = "%s:%s" % (project.vpn_ip, project.vpn_port)
            except exception.NotFound:
                s = "None"
            print "%-20s\t" % s,

            vpn = self._vpn_for(project.id)
            if vpn:
                command = "ping -c1 -w1 %s > /dev/null; echo $?"
                out, _err = utils.execute(command % vpn['private_dns_name'],
                                          check_exit_code=False)
                if out.strip() == '0':
                    net = 'up'
                else:
                    net = 'down'
                print vpn['private_dns_name'],
                print vpn['node_name'],
                print vpn['instance_id'],
                print vpn['state_description'],
                print net

            else:
                print None

    def _vpn_for(self, project_id):
        """Get the VPN instance for a project ID."""
        for instance in db.instance_get_all(context.get_admin_context()):
            if (instance['image_id'] == FLAGS.vpn_image_id
                and not instance['state_description'] in
                    ['shutting_down', 'shutdown']
                and instance['project_id'] == project_id):
                return instance

    def spawn(self):
        """Run all VPNs."""
        for p in reversed(self.manager.get_projects()):
            if not self._vpn_for(p.id):
                print 'spawning %s' % p.id
                self.pipe.launch_vpn_instance(p.id)
                time.sleep(10)

    def run(self, project_id):
        """Start the VPN for a given project."""
        self.pipe.launch_vpn_instance(project_id)


class ShellCommands(object):
    def bpython(self):
        """Runs a bpython shell.

        Falls back to Ipython/python shell if unavailable"""
        self.run('bpython')

    def ipython(self):
        """Runs an Ipython shell.

        Falls back to Python shell if unavailable"""
        self.run('ipython')

    def python(self):
        """Runs a python shell.

        Falls back to Python shell if unavailable"""
        self.run('python')

    def run(self, shell=None):
        """Runs a Python interactive interpreter.

        args: [shell=bpython]"""
        if not shell:
            shell = 'bpython'

        if shell == 'bpython':
            try:
                import bpython
                bpython.embed()
            except ImportError:
                shell = 'ipython'
        if shell == 'ipython':
            try:
                import IPython
                # Explicitly pass an empty list as arguments, because
                # otherwise IPython would use sys.argv from this script.
                shell = IPython.Shell.IPShell(argv=[])
                shell.mainloop()
            except ImportError:
                shell = 'python'

        if shell == 'python':
            import code
            try:
                # Try activating rlcompleter, because it's handy.
                import readline
            except ImportError:
                pass
            else:
                # We don't have to wrap the following import in a 'try',
                # because we already know 'readline' was imported successfully.
                import rlcompleter
                readline.parse_and_bind("tab:complete")
            code.interact()

    def script(self, path):
        """Runs the script from the specifed path with flags set properly.
        arguments: path"""
        exec(compile(open(path).read(), path, 'exec'), locals(), globals())


class RoleCommands(object):
    """Class for managing roles."""

    def __init__(self):
        self.manager = manager.AuthManager()

    def add(self, user, role, project=None):
        """adds role to user
        if project is specified, adds project specific role
        arguments: user, role [project]"""
        self.manager.add_role(user, role, project)

    def has(self, user, role, project=None):
        """checks to see if user has role
        if project is specified, returns True if user has
        the global role and the project role
        arguments: user, role [project]"""
        print self.manager.has_role(user, role, project)

    def remove(self, user, role, project=None):
        """removes role from user
        if project is specified, removes project specific role
        arguments: user, role [project]"""
        self.manager.remove_role(user, role, project)


class UserCommands(object):
    """Class for managing users."""

    @staticmethod
    def _print_export(user):
        """Print export variables to use with API."""
        print 'export EC2_ACCESS_KEY=%s' % user.access
        print 'export EC2_SECRET_KEY=%s' % user.secret

    def __init__(self):
        self.manager = manager.AuthManager()

    def admin(self, name, access=None, secret=None):
        """creates a new admin and prints exports
        arguments: name [access] [secret]"""
        user = self.manager.create_user(name, access, secret, True)
        self._print_export(user)

    def create(self, name, access=None, secret=None):
        """creates a new user and prints exports
        arguments: name [access] [secret]"""
        user = self.manager.create_user(name, access, secret, False)
        self._print_export(user)

    def delete(self, name):
        """deletes an existing user
        arguments: name"""
        self.manager.delete_user(name)

    def exports(self, name):
        """prints access and secrets for user in export format
        arguments: name"""
        user = self.manager.get_user(name)
        if user:
            self._print_export(user)
        else:
            print "User %s doesn't exist" % name

    def list(self):
        """lists all users
        arguments: <none>"""
        for user in self.manager.get_users():
            print user.name

    def modify(self, name, access_key, secret_key, is_admin):
        """update a users keys & admin flag
        arguments: accesskey secretkey admin
        leave any field blank to ignore it, admin should be 'T', 'F', or blank
        """
        if not is_admin:
            is_admin = None
        elif is_admin.upper()[0] == 'T':
            is_admin = True
        else:
            is_admin = False
        self.manager.modify_user(name, access_key, secret_key, is_admin)


class ProjectCommands(object):
    """Class for managing projects."""

    def __init__(self):
        self.manager = manager.AuthManager()

    def add(self, project_id, user_id):
        """Adds user to project
        arguments: project_id user_id"""
        self.manager.add_to_project(user_id, project_id)

    def create(self, name, project_manager, description=None):
        """Creates a new project
        arguments: name project_manager [description]"""
        self.manager.create_project(name, project_manager, description)

    def delete(self, name):
        """Deletes an existing project
        arguments: name"""
        self.manager.delete_project(name)

    def environment(self, project_id, user_id, filename='novarc'):
        """Exports environment variables to an sourcable file
        arguments: project_id user_id [filename='novarc]"""
        rc = self.manager.get_environment_rc(user_id, project_id)
        with open(filename, 'w') as f:
            f.write(rc)

    def list(self):
        """Lists all projects
        arguments: <none>"""
        for project in self.manager.get_projects():
            print project.name

    def quota(self, project_id, key=None, value=None):
        """Set or display quotas for project
        arguments: project_id [key] [value]"""
        ctxt = context.get_admin_context()
        if key:
            quo = {'project_id': project_id, key: value}
            try:
                db.quota_update(ctxt, project_id, quo)
            except exception.NotFound:
                db.quota_create(ctxt, quo)
        project_quota = quota.get_quota(ctxt, project_id)
        for key, value in project_quota.iteritems():
            print '%s: %s' % (key, value)

    def remove(self, project_id, user_id):
        """Removes user from project
        arguments: project_id user_id"""
        self.manager.remove_from_project(user_id, project_id)

    def scrub(self, project_id):
        """Deletes data associated with project
        arguments: project_id"""
        ctxt = context.get_admin_context()
        network_ref = db.project_get_network(ctxt, project_id)
        db.network_disassociate(ctxt, network_ref['id'])
        groups = db.security_group_get_by_project(ctxt, project_id)
        for group in groups:
            db.security_group_destroy(ctxt, group['id'])

    def zipfile(self, project_id, user_id, filename='nova.zip'):
        """Exports credentials for project to a zip file
        arguments: project_id user_id [filename='nova.zip]"""
        try:
            zip_file = self.manager.get_credentials(user_id, project_id)
            with open(filename, 'w') as f:
                f.write(zip_file)
        except db.api.NoMoreNetworks:
            print ('No more networks available. If this is a new '
                   'installation, you need\nto call something like this:\n\n'
                   '    nova-manage network create 10.0.0.0/8 10 64\n\n')


class FloatingIpCommands(object):
    """Class for managing floating ip."""

    def create(self, host, range):
        """Creates floating ips for host by range
        arguments: host ip_range"""
        for address in IPy.IP(range):
            db.floating_ip_create(context.get_admin_context(),
                                  {'address': str(address),
                                   'host': host})

    def delete(self, ip_range):
        """Deletes floating ips by range
        arguments: range"""
        for address in IPy.IP(ip_range):
            db.floating_ip_destroy(context.get_admin_context(),
                                   str(address))

    def list(self, host=None):
        """Lists all floating ips (optionally by host)
        arguments: [host]"""
        ctxt = context.get_admin_context()
        if host == None:
            floating_ips = db.floating_ip_get_all(ctxt)
        else:
            floating_ips = db.floating_ip_get_all_by_host(ctxt, host)
        for floating_ip in floating_ips:
            instance = None
            if floating_ip['fixed_ip']:
                instance = floating_ip['fixed_ip']['instance']['ec2_id']
            print "%s\t%s\t%s" % (floating_ip['host'],
                                  floating_ip['address'],
                                  instance)


class NetworkCommands(object):
    """Class for managing networks."""

    def create(self, fixed_range=None, num_networks=None,
               network_size=None, vlan_start=None, vpn_start=None):
        """Creates fixed ips for host by range
        arguments: [fixed_range=FLAG], [num_networks=FLAG],
                   [network_size=FLAG], [vlan_start=FLAG],
                   [vpn_start=FLAG]"""
        if not fixed_range:
            fixed_range = FLAGS.fixed_range
        if not num_networks:
            num_networks = FLAGS.num_networks
        if not network_size:
            network_size = FLAGS.network_size
        if not vlan_start:
            vlan_start = FLAGS.vlan_start
        if not vpn_start:
            vpn_start = FLAGS.vpn_start
        net_manager = utils.import_object(FLAGS.network_manager)
        net_manager.create_networks(context.get_admin_context(),
                                    fixed_range, int(num_networks),
                                    int(network_size), int(vlan_start),
                                    int(vpn_start))

CATEGORIES = [
    ('user', UserCommands),
    ('project', ProjectCommands),
    ('role', RoleCommands),
    ('shell', ShellCommands),
    ('vpn', VpnCommands),
    ('floating', FloatingIpCommands),
    ('network', NetworkCommands)]


def lazy_match(name, key_value_tuples):
    """Finds all objects that have a key that case insensitively contains
    [name] key_value_tuples is a list of tuples of the form (key, value)
    returns a list of tuples of the form (key, value)"""
    result = []
    for (k, v) in key_value_tuples:
        if k.lower().find(name.lower()) == 0:
            result.append((k, v))
    if len(result) == 0:
        print "%s does not match any options:" % name
        for k, _v in key_value_tuples:
            print "\t%s" % k
        sys.exit(2)
    if len(result) > 1:
        print "%s matched multiple options:" % name
        for k, _v in result:
            print "\t%s" % k
        sys.exit(2)
    return result


def methods_of(obj):
    """Get all callable methods of an object that don't start with underscore
    returns a list of tuples of the form (method_name, method)"""
    result = []
    for i in dir(obj):
        if callable(getattr(obj, i)) and not i.startswith('_'):
            result.append((i, getattr(obj, i)))
    return result


def main():
    """Parse options and call the appropriate class/method."""
    utils.default_flagfile()
    argv = FLAGS(sys.argv)

    if FLAGS.verbose:
        logging.getLogger().setLevel(logging.DEBUG)

    script_name = argv.pop(0)
    if len(argv) < 1:
        print script_name + " category action [<args>]"
        print "Available categories:"
        for k, _ in CATEGORIES:
            print "\t%s" % k
        sys.exit(2)
    category = argv.pop(0)
    matches = lazy_match(category, CATEGORIES)
    # instantiate the command group object
    category, fn = matches[0]
    command_object = fn()
    actions = methods_of(command_object)
    if len(argv) < 1:
        print script_name + " category action [<args>]"
        print "Available actions for %s category:" % category
        for k, _v in actions:
            print "\t%s" % k
        sys.exit(2)
    action = argv.pop(0)
    matches = lazy_match(action, actions)
    action, fn = matches[0]
    # call the action with the remaining arguments
    try:
        fn(*argv)
        sys.exit(0)
    except TypeError:
        print "Possible wrong number of arguments supplied"
        print "%s %s: %s" % (category, action, fn.__doc__)
        raise

if __name__ == '__main__':
    main()