/*
 * 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

import (
	"flag"
	"fmt"
	"github.com/opencord/voltha-go/common/log"
	"os"
)

// RW Core service default constants
const (
	ConsulStoreName               = "consul"
	EtcdStoreName                 = "etcd"
	default_InstanceID           = "rwcore001"
	default_GrpcPort             = 50057
	default_GrpcHost             = ""
	default_KafkaAdapterHost     = "127.0.0.1"
	default_KafkaAdapterPort     = 9092
	default_KafkaClusterHost     = "127.0.0.1"
	default_KafkaClusterPort     = 9094
	default_KVStoreType          = EtcdStoreName
	default_KVStoreTimeout       = 5 //in seconds
	default_KVStoreHost         = "127.0.0.1"
	default_KVStorePort         = 2379 // Consul = 8500; Etcd = 2379
	default_KVTxnKeyDelTime     = 60
	default_KVStoreDataPrefix   = "service/voltha"
	default_LogLevel            = 0
	default_Banner              = false
	default_CoreTopic           = "rwcore"
	default_RWCoreEndpoint      = "rwcore"
	default_RWCoreKey           = "pki/voltha.key"
	default_RWCoreCert          = "pki/voltha.crt"
	default_RWCoreCA            = "pki/voltha-CA.pem"
	default_AffinityRouterTopic = "affinityRouter"
	default_InCompetingMode     = true
	default_LongRunningRequestTimeout = int64(2000)
	default_DefaultRequestTimeout = int64(500)
	default_CoreBindingKey      = "voltha_backend_name"
)

// RWCoreFlags represents the set of configurations used by the read-write core service
type RWCoreFlags struct {
	// Command line parameters
	InstanceID           string
	RWCoreEndpoint       string
	GrpcHost            string
	GrpcPort            int
	KafkaAdapterHost    string
	KafkaAdapterPort    int
	KafkaClusterHost    string
	KafkaClusterPort    int
	KVStoreType         string
	KVStoreTimeout      int // in seconds
	KVStoreHost         string
	KVStorePort         int
	KVTxnKeyDelTime     int
	KVStoreDataPrefix   string
	CoreTopic           string
	LogLevel            int
	Banner              bool
	RWCoreKey           string
	RWCoreCert          string
	RWCoreCA            string
	AffinityRouterTopic string
	InCompetingMode     bool
	LongRunningRequestTimeout int64
	DefaultRequestTimeout int64
	CoreBindingKey      string
}

func init() {
	log.AddPackage(log.JSON, log.WarnLevel, nil)
}

// NewRWCoreFlags returns a new RWCore config
func NewRWCoreFlags() *RWCoreFlags {
	var rwCoreFlag = RWCoreFlags{ // Default values
		InstanceID:          default_InstanceID,
		RWCoreEndpoint:      default_RWCoreEndpoint,
		GrpcHost:            default_GrpcHost,
		GrpcPort:            default_GrpcPort,
		KafkaAdapterHost:    default_KafkaAdapterHost,
		KafkaAdapterPort:    default_KafkaAdapterPort,
		KafkaClusterHost:    default_KafkaClusterHost,
		KafkaClusterPort:     default_KafkaClusterPort,
		KVStoreType:          default_KVStoreType,
		KVStoreTimeout:      default_KVStoreTimeout,
		KVStoreHost:         default_KVStoreHost,
		KVStorePort:         default_KVStorePort,
		KVStoreDataPrefix:   default_KVStoreDataPrefix,
		KVTxnKeyDelTime:     default_KVTxnKeyDelTime,
		CoreTopic:           default_CoreTopic,
		LogLevel:            default_LogLevel,
		Banner:              default_Banner,
		RWCoreKey:           default_RWCoreKey,
		RWCoreCert:          default_RWCoreCert,
		RWCoreCA:            default_RWCoreCA,
		AffinityRouterTopic: default_AffinityRouterTopic,
		InCompetingMode:     default_InCompetingMode,
		DefaultRequestTimeout:default_DefaultRequestTimeout,
		LongRunningRequestTimeout:default_LongRunningRequestTimeout,
		CoreBindingKey:      default_CoreBindingKey,
	}
	return &rwCoreFlag
}

// ParseCommandArguments parses the arguments when running read-write core service
func (cf *RWCoreFlags) ParseCommandArguments() {

	var help string

	help = fmt.Sprintf("RW instance id")
	flag.StringVar(&(cf.InstanceID), "instance-id", default_InstanceID, help)

	help = fmt.Sprintf("RW core endpoint address")
	flag.StringVar(&(cf.RWCoreEndpoint), "vcore-endpoint", default_RWCoreEndpoint, help)

	help = fmt.Sprintf("GRPC server - host")
	flag.StringVar(&(cf.GrpcHost), "grpc_host", default_GrpcHost, help)

	help = fmt.Sprintf("GRPC server - port")
	flag.IntVar(&(cf.GrpcPort), "grpc_port", default_GrpcPort, help)

	help = fmt.Sprintf("Kafka - Adapter messaging host")
	flag.StringVar(&(cf.KafkaAdapterHost), "kafka_adapter_host", default_KafkaAdapterHost, help)

	help = fmt.Sprintf("Kafka - Adapter messaging port")
	flag.IntVar(&(cf.KafkaAdapterPort), "kafka_adapter_port", default_KafkaAdapterPort, help)

	help = fmt.Sprintf("Kafka - Cluster messaging host")
	flag.StringVar(&(cf.KafkaClusterHost), "kafka_cluster_host", default_KafkaClusterHost, help)

	help = fmt.Sprintf("Kafka - Cluster messaging port")
	flag.IntVar(&(cf.KafkaClusterPort), "kafka_cluster_port", default_KafkaClusterPort, help)

	help = fmt.Sprintf("RW Core topic")
	flag.StringVar(&(cf.CoreTopic), "rw_core_topic", default_CoreTopic, help)

	help = fmt.Sprintf("Affinity Router topic")
	flag.StringVar(&(cf.AffinityRouterTopic), "affinity_router_topic", default_AffinityRouterTopic, help)

	help = fmt.Sprintf("In competing Mode - two cores competing to handle a transaction ")
	flag.BoolVar(&cf.InCompetingMode, "in_competing_mode", default_InCompetingMode, help)

	help = fmt.Sprintf("KV store type")
	flag.StringVar(&(cf.KVStoreType), "kv_store_type", default_KVStoreType, help)

	help = fmt.Sprintf("The default timeout when making a kv store request")
	flag.IntVar(&(cf.KVStoreTimeout), "kv_store_request_timeout", default_KVStoreTimeout, help)

	help = fmt.Sprintf("KV store host")
	flag.StringVar(&(cf.KVStoreHost), "kv_store_host", default_KVStoreHost, help)

	help = fmt.Sprintf("KV store port")
	flag.IntVar(&(cf.KVStorePort), "kv_store_port", default_KVStorePort, help)

	help = fmt.Sprintf("The time to wait before deleting a completed transaction key")
	flag.IntVar(&(cf.KVTxnKeyDelTime), "kv_txn_delete_time", default_KVTxnKeyDelTime, help)

	help = fmt.Sprintf("KV store data prefix")
	flag.StringVar(&(cf.KVStoreDataPrefix), "kv_store_data_prefix", default_KVStoreDataPrefix, help)

	help = fmt.Sprintf("Log level")
	flag.IntVar(&(cf.LogLevel), "log_level", default_LogLevel, help)

	help = fmt.Sprintf("Timeout for long running request")
	flag.Int64Var(&(cf.LongRunningRequestTimeout), "timeout_long_request", default_LongRunningRequestTimeout, help)

	help = fmt.Sprintf("Default timeout for regular request")
	flag.Int64Var(&(cf.DefaultRequestTimeout), "timeout_request", default_DefaultRequestTimeout, help)

	help = fmt.Sprintf("Show startup banner log lines")
	flag.BoolVar(&cf.Banner, "banner", default_Banner, help)

	help = fmt.Sprintf("The name of the meta-key whose value is the rw-core group to which the ofagent is bound")
	flag.StringVar(&(cf.CoreBindingKey), "core_binding_key", default_CoreBindingKey, help)

	flag.Parse()

	containerName := getContainerInfo()
	if len(containerName) > 0 {
		cf.InstanceID = containerName
	}

}

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