#!/usr/bin/env python
#
# Copyright 2016 the original author or authors.
#
# 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.
#

"""
Device level CLI commands
"""
from optparse import make_option
from cmd2 import Cmd, options
from simplejson import dumps

from cli.table import print_pb_as_table, print_pb_list_as_table
from cli.utils import print_flows, pb2dict
from voltha.protos import third_party

_ = third_party
from voltha.protos import voltha_pb2
from voltha.protos.device_pb2 import PmConfigs, PmConfig, PmGroupConfig
from google.protobuf.json_format import MessageToDict

# Since proto3 won't send fields that are set to 0/false/"" any object that
# might have those values set in them needs to be replicated here such that the
# fields can be adequately 

class DeviceCli(Cmd):

    def __init__(self, get_channel, device_id):
        Cmd.__init__(self)
        self.get_channel = get_channel
        self.device_id = device_id
        self.prompt = '(' + self.colorize(
            self.colorize('device {}'.format(device_id), 'red'), 'bold') + ') '
        self.pm_config_last = None
        self.pm_config_dirty = False

    def cmdloop(self):
        self._cmdloop()

    def get_device(self, depth=0):
        stub = voltha_pb2.VolthaLocalServiceStub(self.get_channel())
        res = stub.GetDevice(voltha_pb2.ID(id=self.device_id),
                             metadata=(('get-depth', str(depth)), ))
        return res

    do_exit = Cmd.do_quit

    def do_quit(self, line):
        if self.pm_config_dirty:
            self.poutput("Uncommited changes for " + \
                         self.colorize(
                             self.colorize("perf_config,", "blue"),
                             "bold") + " please either " + self.colorize(
                             self.colorize("commit", "blue"), "bold") + \
                         " or " + self.colorize(
                             self.colorize("reset", "blue"), "bold") + \
                         " your changes using " + \
                         self.colorize(
                             self.colorize("perf_config", "blue"), "bold"))
            return False
        else:
            return self._STOP_AND_EXIT

    def do_show(self, line):
        """Show detailed device information"""
        omit_fields = {
            'pm_configs',
            'flows',
            'flow_groups',
            'ports',
            'parent_port_no',
            'reason',
            'vlan',
            'parent_id',
            'root',
            'type',
            'vendor',
            'id'
        }
        print_pb_as_table('Device {}'.format(self.device_id),
                          self.get_device(depth=-1), omit_fields)

    def do_ports(self, line):
        """Show ports of device"""
        device = self.get_device(depth=-1)
        omit_fields = {
            'peers'
        }
        print_pb_list_as_table('Device ports:', device.ports,
                               omit_fields, self.poutput)

    def help_perf_config(self):
        self.poutput(
'''
perfo_config [show | set | commit | reset] [-f <default frequency>] [-e <metric/group
            name>] [-d <metric/group name>] [-o <metric/group name> <override
            frequency>]
Changes made by set are held locally until a commit or reset command is issued.
A commit command will write the configuration to the device and it takes effect
immediately. The reset command will undo any changes sinc the start of the
device session.

If grouped is tre then the -d, -e and -o commands refer to groups and not
individual metrics.
'''
        )

    @options([
        make_option('-f', '--default_freq', action="store", dest='default_freq',
                    type='long', default=None),
        make_option('-e', '--enable', action='append', dest='enable',
                    default=None),
        make_option('-d', '--disable', action='append', dest='disable',
                    default=None),
        make_option('-o', '--overried', action='store', dest='override',
                    nargs=2, default=None, type='string'),
    ])
    def do_perf_config(self, line, opts):
        print(line)
        """Show and set the performance monitoring configuration of the device"""

        device = self.get_device(depth=-1)
        if not self.pm_config_last:
            self.pm_config_last = device.pm_configs

        # Ensure that a valid sub-command was provided
        if line.strip() not in {"set", "show", "commit", "reset", ""}:
                self.poutput(self.colorize('Error: ', 'red') + \
                             self.colorize(self.colorize(line.strip(), 'blue'),
                                           'bold') + ' is not recognized')
                return

        # Ensure no options are provided when requesting to view the config
        if line.strip() == "show" or line.strip() == "":
            if opts.default_freq or opts.enable or opts.disable:
                self.poutput(opts.disable)
                self.poutput(self.colorize('Error: ', 'red') + 'use ' + \
                             self.colorize(self.colorize('"set"', 'blue'),
                                           'bold') + ' to change settings')
                return

        if line.strip() == "set": # Set the supplied values
            # The defualt frequency
            if opts.default_freq:
                self.pm_config_last.default_freq = opts.default_freq
                self.pm_config_dirty = True

            if self.pm_config_last.grouped:
                for g in self.pm_config_last.groups:
                    if opts.enable:
                        if g.group_name in opts.enable:
                            g.enabled = True
                            self.pm_config_dirty = True
                for g in self.pm_config_last.groups:
                    if opts.disable:
                        if g.group_name in opts.disable:
                            g.enabled = False
                            self.pm_config_dirty = True
            else:
                for m in self.pm_config_last.metrics:
                    if opts.enable:
                        if m.name in opts.enable:
                            m.enabled = True
                            self.pm_config_dirty = True
                for m in self.pm_config_last.metrics:
                    if opts.disable:
                        if m.name in opts.disable:
                            m.enabled = False
                            self.pm_config_dirty = True
        #TODO: Add frequency overrides.
        if opts.override:
            pass
        elif line.strip() == "commit" and self.pm_config_dirty:
            stub = voltha_pb2.VolthaLocalServiceStub(self.get_channel())
            stub.UpdateDevicePmConfigs(self.pm_config_last)
            self.pm_config_last = self.get_device(depth=-1).pm_configs
            self.pm_config_dirty = False
        elif line.strip() == "reset" and self.pm_config_dirty:
            self.pm_config_last = self.get_device(depth=-1).pm_configs
            self.pm_config_dirty = False

        omit_fields = {'groups', 'metrics', 'id'}
        print_pb_as_table('PM Config:', self.pm_config_last, omit_fields,
                          self.poutput)
        if self.pm_config_last.grouped:
            #self.poutput("Supported metric groups:")
            for g in self.pm_config_last.groups:
                if self.pm_config_last.freq_override:
                    omit_fields = {'metrics'}
                else:
                    omit_fields = {'group_freq','metrics'}
                print_pb_as_table('', g, omit_fields, self.poutput) 
                if g.enabled:
                    state = 'enabled'
                else:
                    state = 'disabled'
                print_pb_list_as_table(
                    'Metric group {} is {}'.format(g.name,state),
                    g.metrics, {'enabled', 'sample_freq'}, self.poutput,
                    dividers=100)
        else:
            if self.pm_config_last.freq_override:
                omit_fields = {}
            else:
                omit_fields = {'sample_freq'}
            print_pb_list_as_table('Supported metrics:', self.pm_config_last.metrics,
                                   omit_fields, self.poutput, dividers=100)


    def do_flows(self, line):
        """Show flow table for device"""
        device = pb2dict(self.get_device(-1))
        print_flows(
            'Device',
            self.device_id,
            type=device['type'],
            flows=device['flows']['items'],
            groups=device['flow_groups']['items']
        )