#!/usr/bin/env python
#
# Created as part of the StratusLab project (http://stratuslab.eu),
# co-funded by the European Commission under the Grant Agreement
# INFSO-RI-261552."
#
# Copyright (c) 2011, Centre National de la Recherche Scientifique (CNRS)
#
# 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.
#

import os
import sys
from optparse import OptionParser

sys.path.append('/var/lib/stratuslab/python')

from stratuslab.Util import modulePath, printError
from stratuslab.AuthnCommand import AuthnCommand
from stratuslab.commandbase.StorageCommand import StorageCommand
from stratuslab.PersistentDisk import PersistentDisk
from stratuslab.ConfigHolder import ConfigHolder


class MainProgram(AuthnCommand, StorageCommand):
    '''A command-line program to view the persistent disk.'''

    def __init__(self):
        super(MainProgram, self).__init__()

    def parse(self):
        self.parser.usage = '%prog  [volume_uid ...] [[--filter name=value] ...]'
        self.parser.description = '''List all available disk or only specified 
for the current user (-u/--username).'''
        
        self.parser.add_option('-f', '--filter', dest='filters',
                help='''Filter available disk with specified properties.
Name are the one specified when describing disk properties. Values can be python
regex pattern. 
Example: --filter owner:john --filter tag:grid-* will show only john's disk 
that have a tag matching the regex pattern.''', 
                metavar='name:value', action='append', default=[])

        StorageCommand.addPDiskEndpointOptions(self.parser)

        super(MainProgram, self).parse()

        self.options, self.uuids = self.parser.parse_args()

    def doWork(self):
        configHolder = ConfigHolder(self.options.__dict__, self.config or {})
        pdisk = PersistentDisk(configHolder)
        filters = self._formatFilter()
        volumes = pdisk.describeVolumes(filters)
        self._printVolumes(volumes)
        
    def _printVolumes(self, volumes):
        if not len(volumes):
            print 'No disk to show'
        for disk in volumes:
            print ':: DISK %s' % disk['uuid']
            self._printDict(disk, ['uuid',])
            
    def _printDict(self, dict, excludeKey=[]):
        for k, v in dict.items():
            if k not in excludeKey:
                print '\t%s: %s' % (k, v)
                
    def _formatFilter(self):
        # produce {key:[value,]}
        filters = {}
        self._addUuidToFilters()
        for filter in self.options.filters:
            key = filter.split(':')[0]
            value = ':'.join(filter.split(':')[1:]).lstrip().rstrip()
            if key in filters:
                if value not in filters[key]: 
                    filters[key].append(value)
            else:
                filters[key] = [value,]
        return filters
                
    def _addUuidToFilters(self):
        for uuid in self.uuids:
            self.options.filters.append('uuid:%s' % uuid)
            
if __name__ == '__main__':
    try:
        MainProgram()
    except KeyboardInterrupt:
        print '\n\nExecution interrupted by the user... goodbye!'
