/*
 * 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"
	"fmt"
	"github.com/opencord/voltha-go/common/log"
	"os"
)

// Open OLT default constants
const (
	EtcdStoreName             = "etcd"
	defaultInstanceid         = "openOlt001"
	defaultKafkaadapterhost   = "127.0.0.1"
	defaultKafkaadapterport   = 9092
	defaultKafkaclusterhost   = "127.0.0.1"
	defaultKafkaclusterport   = 9094
	defaultKvstoretype        = EtcdStoreName
	defaultKvstoretimeout     = 5 //in seconds
	defaultKvstorehost        = "127.0.0.1"
	defaultKvstoreport        = 2379 // Consul = 8500; Etcd = 2379
	defaultLoglevel           = 0
	defaultBanner             = false
	defaultDisplayVersionOnly = false
	defaultTopic              = "openolt"
	defaultCoretopic          = "rwcore"
	defaultEventtopic         = "voltha.events"
	defaultOnunumber          = 1
)

// AdapterFlags represents the set of configurations used by the read-write adaptercore service
type AdapterFlags struct {
	// Command line parameters
	InstanceID         string
	KafkaAdapterHost   string
	KafkaAdapterPort   int
	KafkaClusterHost   string
	KafkaClusterPort   int
	KVStoreType        string
	KVStoreTimeout     int // in seconds
	KVStoreHost        string
	KVStorePort        int
	Topic              string
	CoreTopic          string
	EventTopic         string
	LogLevel           int
	OnuNumber          int
	Banner             bool
	DisplayVersionOnly bool
}

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

// NewAdapterFlags returns a new RWCore config
func NewAdapterFlags() *AdapterFlags {
	var adapterFlags = AdapterFlags{ // Default values
		InstanceID:         defaultInstanceid,
		KafkaAdapterHost:   defaultKafkaadapterhost,
		KafkaAdapterPort:   defaultKafkaadapterport,
		KafkaClusterHost:   defaultKafkaclusterhost,
		KafkaClusterPort:   defaultKafkaclusterport,
		KVStoreType:        defaultKvstoretype,
		KVStoreTimeout:     defaultKvstoretimeout,
		KVStoreHost:        defaultKvstorehost,
		KVStorePort:        defaultKvstoreport,
		Topic:              defaultTopic,
		CoreTopic:          defaultCoretopic,
		EventTopic:         defaultEventtopic,
		LogLevel:           defaultLoglevel,
		OnuNumber:          defaultOnunumber,
		Banner:             defaultBanner,
		DisplayVersionOnly: defaultDisplayVersionOnly,
	}
	return &adapterFlags
}

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

	help := fmt.Sprintf("Kafka - Adapter messaging host")
	flag.StringVar(&(so.KafkaAdapterHost), "kafka_adapter_host", defaultKafkaadapterhost, help)

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

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

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

	help = fmt.Sprintf("Open OLT topic")
	flag.StringVar(&(so.Topic), "adapter_topic", defaultTopic, help)

	help = fmt.Sprintf("Core topic")
	flag.StringVar(&(so.CoreTopic), "core_topic", defaultCoretopic, help)

	help = fmt.Sprintf("Event topic")
	flag.StringVar(&(so.EventTopic), "event_topic", defaultEventtopic, help)

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

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

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

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

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

	help = fmt.Sprintf("Number of ONUs")
	flag.IntVar(&(so.OnuNumber), "onu_number", defaultOnunumber, help)

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

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

	flag.Parse()

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

}

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