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

# Copyright 2018 Lenovo
#
# 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 optparse
import os
import signal
import sys

try:
    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
except AttributeError:
    pass
path = os.path.dirname(os.path.realpath(__file__))
path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
if path.startswith('/opt'):
    sys.path.append(path)

import confluent.client as client
exitcode = 0

class OptParser(optparse.OptionParser):

    def format_epilog(self, formatter):
        return self.expand_prog_name(self.epilog)

def mbtohuman(mb):
    if mb > 1000000:
        return '{0:.3f} TB'.format(mb/1000000.0)
    if mb > 1000:
        return '{0:.3f} GB'.format(mb/1000.0)
    return '{0:.3f} MB'.format(mb)

def showstorage(noderange, options, args):
    global exitcode
    session = client.Command()
    storagebynode = {}
    disks = {}
    arrays = {}
    volumes = {}
    scfg = session.read('/noderange/{0}/configuration/storage/all'.format(
        noderange))
    for e in scfg:
        if 'error' in e:
            sys.stderr.write(e['error'] + '\n')
            exitcode = e.get('errorcode', 1)
        for node in e.get('databynode', {}):
            if node not in storagebynode:
                storagebynode[node] = {'disks': [], 'arrays': [], 'volumes': []}
            curr = e['databynode'][node]
            storagebynode[node][curr['type'] + 's'].append(curr)
    for node in storagebynode:
        for disk in sorted(storagebynode[node]['disks'],
                           key=lambda x: x['name']):
            print('{0}: Disk {1} Description: {2}'.format(
                node, disk['name'], disk['description']))
            print('{0}: Disk {1} State: {2}'.format(node, disk['name'],
                                               disk['state']))
            print('{0}: Disk {1} FRU: {2}'.format(node, disk['name'],
                                                  disk['fru']))
            print('{0}: Disk {1} Serial Number: {2}'.format(node, disk['name'],
                                                       disk['serial']))
            if disk['array']:
                print('{0}: Disk {1} Array: {2}'.format(node, disk['name'],
                                                        disk['array']))
        for arr in storagebynode[node]['arrays']:
            print('{0}: Array {1} Available Capacity: {2}'.format(
                node, arr['id'], mbtohuman(arr['available'])))
            print('{0}: Array {1} Total Capacity: {2}'.format(
                node, arr['id'], mbtohuman(arr['capacity'])))
            print('{0}: Array {1} RAID: {2}'.format(node, arr['id'],
                                                    arr['raid']))
            print('{0}: Array {1} Disks: {2}'.format(node, arr['id'], ','.join(
                arr['disks'])))
            print('{0}: Array {1} Volumes: {2}'.format(node, arr['id'], ','.join(
                arr['volumes'])))
        for vol in storagebynode[node]['volumes']:
            print('{0}: Volume {1}: Size: {2}'.format(node, vol['name'],
                                                       mbtohuman(vol['size'])))
            print('{0}: Volume {1}: State: {2}'.format(node, vol['name'],
                                                       vol['state']))
            print('{0}: Volume {1}: Array {2}'.format(node, vol['name'],
                                                      vol['array']))

def createstorage(noderange, options, args):
    if options.raidlevel is None or options.disks is None:
        sys.stderr.write('-r and -d are required arguments to create array\n')
        sys.exit(1)
    session = client.Command()
    names = options.name
    if names is None:
        names = ''
    parms = {'disks': options.disks, 'raidlevel': options.raidlevel}
    if options.size:
        parms['size'] = options.size
    for rsp in session.create(
            '/noderange/{0}/configuration/storage/volumes/{1}'.format(
                noderange, names), parms):
        print(repr(rsp))


def deletestorage(noderange, options, args):
    if options.name is None:
        if len(args) == 1:
            names = args[0]
        else:
            sys.stderr.write('-n is required to indicate volume(s) to delete\n')
            sys.exit(1)
    else:
        names = options.name
    session = client.Command()
    for rsp in session.delete(
            '/noderange/{0}/configuration/storage/volumes/{1}'.format(
                noderange, names)):
        print(repr(rsp))


def setstorage(noderange, options, args):
    pass

funmap = {
    'create': createstorage,
    'show': showstorage,
    'set': setstorage,
    'delete': deletestorage,
    'rm': deletestorage,
}



def main():
    argparser = OptParser(
        usage='Usage: %prog <noderange> [show|create|set|delete]',
        epilog='',
    )
    argparser.add_option('-r', '--raidlevel', type='int',
                         help='RAID level to use when creating an array')
    argparser.add_option('-d', '--disks', type='str',
                         help='Comma separated list of disks to use, or the '
                              'word "rest" to indicate use of all available '
                              'disks')
    argparser.add_option('-s', '--size', type='str',
                         help='Comma separated list of sizes to use when '
                              'creating volumes.  The sizes may be absolute '
                              'size (e.g. 16gb), percentage (10%) or the word '
                              '"rest" to use remaining capacity, default '
                              'behavior is to use all capacity to make a '
                              'volume')
    argparser.add_option('-n', '--name', type='str',
                         help='Comma separated list of names to use when '
                              'naming volumes, or selecting a volume for '
                              'delete.  Default behavior is to use '
                              'implementation provided default names.')
    (options, args) = argparser.parse_args()
    try:
        noderange = args[0]
        operation = args[1]
    except IndexError:
        argparser.print_help()
        sys.exit(1)
    client.check_globbing(noderange)
    try:
        handler = funmap[operation]
    except KeyError:
        argparser.print_help()
        sys.exit(1)
    handler(noderange, options, args[2:])


if __name__ == '__main__':
    main()