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

# Copyright 2017 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 csv
import optparse
import os
import sys
import time

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
import confluent.sortutil as sortutil

defcolumns = ['Node', 'Model', 'Serial', 'UUID', 'Mac Address', 'Type',
              'Current IP Addresses']
columnmapping = {
    'Node': 'nodename',
    'Model': 'modelnumber',
    'Serial': 'serialnumber',
    'UUID': 'uuid',
    'Type': 'types',
    'Current IP Addresses': 'ipaddrs',
    'IP': 'ipaddrs',
    'Bay': 'bay',
    'Mac Address': 'macs',
    'Mac': 'macs',
    'Switch': 'switch',
    'Port': 'port',
    'Advertised IP': 'otheripaddrs',
    'Other IP': 'otheripaddrs',
}


def print_disco(options, session, currmac, outhandler, columns):
    procinfo = {}
    for tmpinfo in session.read('/discovery/by-mac/{0}'.format(currmac)):

        procinfo.update(tmpinfo)
    if 'Switch' in columns or 'Port' in columns:
        for tmpinfo in session.read(
                '/networking/macs/by-mac/{0}'.format(currmac)):
            if 'ports' in tmpinfo:
                # The api sorts so that the most specific available value
                # is last
                procinfo.update(tmpinfo['ports'][-1])
    record = []
    for col in columns:
        rawcol = columnmapping[col]
        rawval = procinfo.get(rawcol, '')
        if isinstance(rawval, list):
            record.append(','.join(rawval))
        else:
            record.append(str(rawval))
    if options.csv:
        csv.writer(sys.stdout).writerow(record)
    else:
        outhandler.add_row(record)


def process_header(header):
    # normalize likely header titles
    fields = []
    broken = False
    for datum in header:
        datum = datum.lower()
        if datum.startswith('node') or datum.startswith('name'):
            fields.append('node')
        elif datum in ('nodegroup', 'nodegroups', 'group', 'groups'):
            fields.append('groups')
        elif datum.startswith('mac') or datum.startswith('ether'):
            fields.append('mac')
        elif datum.startswith('serial') or datum in ('sn', 's/n'):
            fields.append('serial')
        elif datum == 'uuid':
            fields.append('uuid')
        elif datum in ('bmc', 'imm', 'xcc'):
            fields.append('hardwaremanagement.manager')
        elif datum in ('bmc gateway', 'xcc gateway', 'imm gateway'):
            fields.append('net.bmc.ipv4_gateway')
        elif datum in ('bmcuser', 'username', 'user'):
            fields.append('secret.hardwaremanagementuser')
        elif datum in ('bmcpass', 'password', 'pass'):
            fields.append('secret.hardwaremanagementpassword')
        else:
            print("Unrecognized column name {0}".format(datum))
            broken = True
    if broken:
        sys.exit(1)
    return tuple(fields)


def datum_complete(datum):
    if 'node' not in datum or not datum['node']:
        sys.stderr.write('Nodename is a required field')
        return False
    provided = set(datum)
    required = set(['serial', 'uuid', 'mac'])
    for field in provided & required:
        if datum[field]:
            break
    else:
        sys.stderr.write('One of the fields "Serial Number", "UUID", or '
                   '"MAC Address" must be provided')
        return False
    return True


searchkeys = set(['mac', 'serial', 'uuid'])


def search_record(datum, options, session):
    for searchkey in searchkeys:
        options.__dict__[searchkey] = None
    for searchkey in searchkeys & set(datum):
        options.__dict__[searchkey] = datum[searchkey]
    return list(list_matching_macs(options, session))


def datum_to_attrib(datum):
    for key in ('serial', 'uuid', 'mac'):
        try:
            del datum[key]
        except KeyError:
            pass
    datum['name'] = datum['node']
    del datum['node']
    return datum

unique_fields = frozenset(['serial', 'mac', 'uuid'])

def import_csv(options, session):
    nodedata = []
    unique_data = {}
    with open(options.importfile, 'r') as datasrc:
        records = csv.reader(datasrc)
        fields = process_header(next(records))
        for field in fields:
            if field in unique_fields:
                unique_data[field] = set([])
        for record in records:
            currfields = list(fields)
            nodedatum = {}
            for datum in record:
                currfield = currfields.pop(0)
                if currfield in unique_fields:
                    if datum in unique_data[currfield]:
                        sys.stderr.write(
                            "Import contains duplicate values "
                            "({0} with value {1}\n".format(currfield, datum)
                        )
                        sys.exit(1)
                    unique_data[currfield].add(datum)
                nodedatum[currfield] = datum
            if not datum_complete(nodedatum):
                sys.exit(1)
            if not search_record(nodedatum, options, session):
                blocking_scan(session)
            if not search_record(nodedatum, options, session):
                sys.stderr.write(
                    "Could not match the following data: " +
                    repr(nodedatum) + '\n')
                sys.exit(1)
            nodedata.append(nodedatum)
    for datum in nodedata:
        maclist = search_record(datum, options, session)
        datum = datum_to_attrib(datum)
        nodename = datum['name']
        for res in session.create('/nodes/', datum):
            if 'error' in res:
                sys.stderr.write(res['error'] + '\n')
                continue
            elif 'created' in res:
                print('Defined ' + res['created'])
            else:
                print(repr(res))
        for mac in maclist:
            for res in session.update('/discovery/by-mac/{0}'.format(mac),
                                      {'node': nodename}):
                if 'error' in res:
                    sys.stderr.write(res['error'] + '\n')
                    continue
                elif 'assigned' in res:
                    print('Discovered ' + res['assigned'])
                else:
                    print(repr(res))


def list_discovery(options, session):
    outhandler = None
    orderby = None
    if options.fields:
        columns = []
        for field in options.fields.split(','):
            for cdt in columnmapping:
                if cdt.lower().replace(
                        ' ', '') == field.lower().replace(' ', ''):
                    columns.append(cdt)
    else:
        columns = defcolumns
    if options.order:
        for field in columns:
            if options.order.lower() == field.lower():
                orderby = field
    if options.csv:
        csv.writer(sys.stdout).writerow(columns)
    else:
        outhandler = client.Tabulator(columns)
    for mac in list_matching_macs(options, session):
        print_disco(options, session, mac, outhandler, columns)
    if outhandler:
        for row in outhandler.get_table(orderby):
            print(row)

def clear_discovery(options, session):
    for mac in list_matching_macs(options, session):
        for res in session.delete('/discovery/by-mac/{0}'.format(mac)):
            if 'deleted' in res:
                print('Cleared info for {0}'.format(res['deleted']))
            else:
                print(repr(res))

def list_matching_macs(options, session):
    path = '/discovery/'
    if options.model:
        path += 'by-model/{0}/'.format(options.model)
    if options.serial:
        path += 'by-serial/{0}/'.format(options.serial)
    if options.uuid:
        path += 'by-uuid/{0}/'.format(options.uuid)
    if options.type:
        path += 'by-type/{0}/'.format(options.type)
    if options.state:
        if options.state == 'unknown':
            options.state = 'unidentified'
        path += 'by-state/{0}/'.format(options.state).lower()
    if options.mac:
        path += 'by-mac/{0}'.format(options.mac)
        result = list(session.read(path))[0]
        if 'error' in result:
            return []
        return [options.mac.replace(':', '-')]
    else:
        path += 'by-mac/'
        return [x['item']['href'] for x in session.read(path)]

def assign_discovery(options, session):
    abort = False
    if options.importfile:
        return import_csv(options, session)
    if not (options.serial or options.uuid or options.mac):
        sys.stderr.write(
            "UUID (-u), serial (-s), or ether address (-e) required for "
            "assignment\n")
        abort = True
    if not options.node:
        sys.stderr.write("Node (-n) must be specified for assignment\n")
        abort = True
    if abort:
        sys.exit(1)
    matches = list_matching_macs(options, session)
    if not matches:
        # Do a rescan to catch missing requested data
        blocking_scan(session)
        matches = list_matching_macs(options, session)
    if not matches:
        sys.stderr.write("No matching discovery candidates found\n")
        sys.exit(1)
    for res in session.update('/discovery/by-mac/{0}'.format(matches[0]),
                   {'node': options.node}):
        if 'assigned' in res:
            print('Assigned: {0}'.format(res['assigned']))
        else:
            print(repr(res))

def blocking_scan(session):
    list(session.update('/discovery/rescan', {'rescan': 'start'}))
    while(list(session.read('/discovery/rescan'))[0].get('scanning', False)):
        time.sleep(0.5)


def main():
    parser = optparse.OptionParser(
        usage='Usage: %prog [list|assign|rescan|clear] [options]')
    # -a for 'address' maybe?
    # order by
    # show state (discovered or..
    # nodediscover approve?
    # flush to clear old data out?  (e.g. no good way to age pxe data)
    # also delete discovery datum... more targeted
    # defect: -t lenovo-imm returns all
    parser.add_option('-m', '--model', dest='model',
                      help='Operate with nodes matching the specified model '
                       'number', metavar='MODEL')
    parser.add_option('-d', '--discoverystate', dest='state',
                      help='The discovery state of the entries (discovered, '
                           'identified, and unidentified)')
    parser.add_option('-s', '--serial', dest='serial',
                      help='Operate against the system matching the specified '
                           'serial number', metavar='SERIAL')
    parser.add_option('-u', '--uuid', dest='uuid',
                      help='Operate against the system matching the specified '
                           'UUID', metavar='UUID')
    parser.add_option('-n', '--node', help='Operate with the given nodename')
    parser.add_option('-e', '--ethaddr', dest='mac',
                      help='Operate against the system with the specified MAC '
                           'address', metavar='MAC')
    parser.add_option('-t', '--type', dest='type',
                      help='Operate against the system of the specified type',
                      metavar='TYPE')
    parser.add_option('-c', '--csv', dest='csv',
                      help='Use CSV formatted output', action='store_true')
    parser.add_option('-i', '--import', dest='importfile',
                      help='Import bulk assignment data from given CSV file',
                      metavar='IMPORT.CSV')
    parser.add_option('-f', '--fields', dest='fields',
                      help='Select fields for output',
                      metavar='FIELDS')
    parser.add_option('-o', '--order', dest='order',
                      help='Order output by given field', metavar='ORDER')
    (options, args) = parser.parse_args()
    if len(args) == 0 or args[0] not in ('list', 'assign', 'rescan', 'clear'):
        parser.print_help()
        sys.exit(1)
    session = client.Command()
    if args[0] == 'list':
        list_discovery(options, session)
    if args[0] == 'clear':
        clear_discovery(options, session)
    if args[0] == 'assign':
        assign_discovery(options, session)
    if args[0] == 'rescan':
        blocking_scan(session)
        print("Rescan complete")


if __name__ == '__main__':
    main()