#!/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_show(self, line):
        """Show detailed device information"""
        print_pb_as_table('Device {}'.format(self.device_id),
                          self.get_device(depth=-1))

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

    @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),
    ])
    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.

        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']
        )