/*
* Copyright 2018-present Open Networking Foundation

* 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.
 */

//Package config provides the Log, kvstore, Kafka configuration
package config

import (
	"flag"
	"os"
	"time"
)

// Open OLT default constants
const (
	EtcdStoreName               = "etcd"
	defaultInstanceid           = "openOlt001"
	defaultKafkaclusteraddress  = "127.0.0.1:9092"
	defaultKvstoretype          = EtcdStoreName
	defaultKvstoretimeout       = 5 * time.Second
	defaultRPCTimeout           = 10 * time.Second
	defaultKvstoreaddress       = "127.0.0.1:2379" // Port: Consul = 8500; Etcd = 2379
	defaultLoglevel             = "WARN"
	defaultBanner               = false
	defaultDisplayVersionOnly   = false
	defaultEventtopic           = "voltha.events"
	defaultOnunumber            = 1
	defaultProbeAddress         = ":8080"
	defaultLiveProbeInterval    = 60 * time.Second
	defaultNotLiveProbeInterval = 5 * time.Second // Probe more frequently when not alive
	//defaultHeartbeatCheckInterval is the time in seconds the adapter will keep checking the hardware for heartbeat.
	defaultHeartbeatCheckInterval = 15 * time.Second
	// defaultHeartbeatFailReportInterval is the time adapter will wait before updating the state to the core.
	defaultHeartbeatFailReportInterval = 0 * time.Second
	defaultGrpcAddress                 = ":50060"
	defaultCoreEndpoint                = ":55555"
	//defaultGrpcTimeoutInterval is the time in seconds a grpc call will wait before returning error.
	defaultGrpcTimeoutInterval                = 2 * time.Second
	defaultCurrentReplica                     = 1
	defaultTotalReplicas                      = 1
	defaultTraceEnabled                       = false
	defaultTraceAgentAddress                  = "127.0.0.1:6831"
	defaultLogCorrelationEnabled              = true
	defaultOmccEncryption                     = false
	defaultEnableONUStats                     = false
	defaultEnableGEMStats                     = false
	defaultMinBackoffRetryDelay               = 500 * time.Millisecond
	defaultMaxBackoffRetryDelay               = 10 * time.Second
	defaultAdapterEndpoint                    = "adapter-open-olt"
	defaultCheckOnuDevExistenceAtOnuDiscovery = false
)

// AdapterFlags represents the set of configurations used by the read-write adaptercore service
type AdapterFlags struct {
	// Command line parameters
	AdapterName                        string
	InstanceID                         string // NOTE what am I used for? why not cli but only ENV? TODO expose in the chart
	KafkaClusterAddress                string
	KVStoreType                        string
	KVStoreTimeout                     time.Duration
	KVStoreAddress                     string
	RPCTimeout                         time.Duration
	EventTopic                         string
	LogLevel                           string
	OnuNumber                          int
	Banner                             bool
	DisplayVersionOnly                 bool
	ProbeAddress                       string
	LiveProbeInterval                  time.Duration
	NotLiveProbeInterval               time.Duration
	HeartbeatCheckInterval             time.Duration
	HeartbeatFailReportInterval        time.Duration
	GrpcTimeoutInterval                time.Duration
	GrpcAddress                        string
	CoreEndpoint                       string
	CurrentReplica                     int
	TotalReplicas                      int
	TraceEnabled                       bool
	TraceAgentAddress                  string
	LogCorrelationEnabled              bool
	OmccEncryption                     bool
	EnableONUStats                     bool
	EnableGEMStats                     bool
	MinBackoffRetryDelay               time.Duration
	MaxBackoffRetryDelay               time.Duration
	AdapterEndpoint                    string
	CheckOnuDevExistenceAtOnuDiscovery bool
}

// NewAdapterFlags returns a new RWCore config
func NewAdapterFlags() *AdapterFlags {
	var adapterFlags = AdapterFlags{ // Default values
		InstanceID:                         defaultInstanceid,
		KafkaClusterAddress:                defaultKafkaclusteraddress,
		KVStoreType:                        defaultKvstoretype,
		KVStoreTimeout:                     defaultKvstoretimeout,
		KVStoreAddress:                     defaultKvstoreaddress,
		EventTopic:                         defaultEventtopic,
		LogLevel:                           defaultLoglevel,
		OnuNumber:                          defaultOnunumber,
		Banner:                             defaultBanner,
		DisplayVersionOnly:                 defaultDisplayVersionOnly,
		ProbeAddress:                       defaultProbeAddress,
		LiveProbeInterval:                  defaultLiveProbeInterval,
		NotLiveProbeInterval:               defaultNotLiveProbeInterval,
		HeartbeatCheckInterval:             defaultHeartbeatCheckInterval,
		HeartbeatFailReportInterval:        defaultHeartbeatFailReportInterval,
		GrpcAddress:                        defaultGrpcAddress,
		CoreEndpoint:                       defaultCoreEndpoint,
		GrpcTimeoutInterval:                defaultGrpcTimeoutInterval,
		TraceEnabled:                       defaultTraceEnabled,
		TraceAgentAddress:                  defaultTraceAgentAddress,
		LogCorrelationEnabled:              defaultLogCorrelationEnabled,
		OmccEncryption:                     defaultOmccEncryption,
		EnableONUStats:                     defaultEnableONUStats,
		EnableGEMStats:                     defaultEnableGEMStats,
		RPCTimeout:                         defaultRPCTimeout,
		MinBackoffRetryDelay:               defaultMinBackoffRetryDelay,
		MaxBackoffRetryDelay:               defaultMaxBackoffRetryDelay,
		CheckOnuDevExistenceAtOnuDiscovery: defaultCheckOnuDevExistenceAtOnuDiscovery,
	}
	return &adapterFlags
}

// ParseCommandArguments parses the arguments when running read-write adaptercore service
func (so *AdapterFlags) ParseCommandArguments() {

	flag.StringVar(&(so.KafkaClusterAddress),
		"kafka_cluster_address",
		defaultKafkaclusteraddress,
		"Kafka - Cluster messaging address")

	flag.StringVar(&(so.EventTopic),
		"event_topic",
		defaultEventtopic,
		"Event topic")

	flag.StringVar(&(so.KVStoreType),
		"kv_store_type",
		defaultKvstoretype,
		"KV store type")

	flag.DurationVar(&(so.KVStoreTimeout),
		"kv_store_request_timeout",
		defaultKvstoretimeout,
		"The default timeout when making a kv store request")

	flag.StringVar(&(so.KVStoreAddress),
		"kv_store_address",
		defaultKvstoreaddress,
		"KV store address")

	flag.StringVar(&(so.LogLevel),
		"log_level",
		defaultLoglevel,
		"Log level")

	flag.IntVar(&(so.OnuNumber),
		"onu_number",
		defaultOnunumber,
		"Number of ONUs")

	flag.BoolVar(&(so.Banner),
		"banner",
		defaultBanner,
		"Show startup banner log lines")

	flag.BoolVar(&(so.DisplayVersionOnly),
		"version",
		defaultDisplayVersionOnly,
		"Show version information and exit")

	flag.StringVar(&(so.ProbeAddress),
		"probe_address",
		defaultProbeAddress,
		"The address on which to listen to answer liveness and readiness probe queries over HTTP.")

	flag.DurationVar(&(so.LiveProbeInterval),
		"live_probe_interval",
		defaultLiveProbeInterval,
		"Number of seconds for the default liveliness check")

	flag.DurationVar(&(so.NotLiveProbeInterval),
		"not_live_probe_interval",
		defaultNotLiveProbeInterval,
		"Number of seconds for liveliness check if probe is not running")

	flag.DurationVar(&(so.HeartbeatCheckInterval),
		"heartbeat_check_interval",
		defaultHeartbeatCheckInterval,
		"Number of seconds for heartbeat check interval")

	flag.DurationVar(&(so.HeartbeatFailReportInterval),
		"heartbeat_fail_interval",
		defaultHeartbeatFailReportInterval,
		"Number of seconds adapter has to wait before reporting core on the heartbeat check failure")

	flag.DurationVar(&(so.GrpcTimeoutInterval),
		"grpc_timeout_interval",
		defaultGrpcTimeoutInterval,
		"Number of seconds for GRPC timeout")

	flag.IntVar(&(so.CurrentReplica),
		"current_replica",
		defaultCurrentReplica,
		"Replica number of this particular instance")

	flag.IntVar(&(so.TotalReplicas),
		"total_replica",
		defaultTotalReplicas,
		"Total number of instances for this adapter")

	flag.BoolVar(&(so.TraceEnabled),
		"trace_enabled",
		defaultTraceEnabled,
		"Whether to send logs to tracing agent?")

	flag.StringVar(&(so.TraceAgentAddress),
		"trace_agent_address",
		defaultTraceAgentAddress,
		"The address of tracing agent to which span info should be sent")

	flag.BoolVar(&(so.LogCorrelationEnabled),
		"log_correlation_enabled",
		defaultLogCorrelationEnabled,
		"Whether to enrich log statements with fields denoting operation being executed for achieving correlation?")

	flag.BoolVar(&(so.OmccEncryption),
		"omcc_encryption",
		defaultOmccEncryption,
		"OMCI Channel encryption status")

	flag.BoolVar(&(so.EnableONUStats),
		"enable_onu_stats",
		defaultEnableONUStats,
		"Enable ONU Statistics")

	flag.BoolVar(&(so.EnableGEMStats),
		"enable_gem_stats",
		defaultEnableGEMStats,
		"Enable GEM Statistics")

	flag.StringVar(&(so.GrpcAddress),
		"grpc_address",
		defaultGrpcAddress,
		"Adapter GRPC Server address")

	flag.StringVar(&(so.CoreEndpoint),
		"core_endpoint",
		defaultCoreEndpoint,
		"Core endpoint")

	flag.StringVar(&(so.AdapterEndpoint),
		"adapter_endpoint",
		defaultAdapterEndpoint,
		"Adapter Endpoint")

	flag.DurationVar(&(so.RPCTimeout),
		"rpc_timeout",
		defaultRPCTimeout,
		"The default timeout when making an RPC request")

	flag.DurationVar(&(so.MinBackoffRetryDelay),
		"min_retry_delay",
		defaultMinBackoffRetryDelay,
		"The minimum number of milliseconds to delay before a connection retry attempt")

	flag.DurationVar(&(so.MaxBackoffRetryDelay),
		"max_retry_delay",
		defaultMaxBackoffRetryDelay,
		"The maximum number of milliseconds to delay before a connection retry attempt")

	flag.BoolVar(&(so.CheckOnuDevExistenceAtOnuDiscovery),
		"check_onu_exist_on_discovery",
		defaultCheckOnuDevExistenceAtOnuDiscovery,
		"Whether to check for flows only or child device before honoring discovery?")

	flag.Parse()
	containerName := getContainerInfo()
	if len(containerName) > 0 {
		so.InstanceID = containerName
	}

}

func getContainerInfo() string {
	return os.Getenv("HOSTNAME")
}