/*
 * 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)
)

// 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
}

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,
	}
	return &rwCoreFlag
}

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

	var help string

	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)

	flag.Parse()

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

}

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