package client

import (
	"sync"
	"time"

	"git.loafle.net/commons_go/rpc"
	"git.loafle.net/commons_go/rpc/protocol"
)

type ClientHandlers struct {
	ContentType string
	Codec       protocol.ClientCodec
	// Maximum request time.
	// Default value is DefaultRequestTimeout.
	RequestTimeout time.Duration
	// The maximum number of pending requests in the queue.
	//
	// The number of pending requsts should exceed the expected number
	// of concurrent goroutines calling client's methods.
	// Otherwise a lot of ClientError.Overflow errors may appear.
	//
	// Default is DefaultPendingMessages.
	PendingRequests int

	RPCRegistry rpc.Registry

	requestID    uint64
	requestIDMtx sync.Mutex
}

func (ch *ClientHandlers) OnStart() {
	// no op
}

func (ch *ClientHandlers) OnStop() {
	// no op
}

func (ch *ClientHandlers) GetContentType() string {
	return ch.ContentType
}

func (ch *ClientHandlers) GetCodec() protocol.ClientCodec {
	return ch.Codec
}

func (ch *ClientHandlers) GetRPCRegistry() rpc.Registry {
	return ch.RPCRegistry
}

func (ch *ClientHandlers) GetRequestTimeout() time.Duration {
	return ch.RequestTimeout
}

func (ch *ClientHandlers) GetPendingRequests() int {
	return ch.PendingRequests
}

func (ch *ClientHandlers) GetRequestID() interface{} {
	var id uint64
	ch.requestIDMtx.Lock()
	ch.requestID++
	id = ch.requestID
	ch.requestIDMtx.Unlock()

	return id
}

func (ch *ClientHandlers) Validate() {
	if "" == ch.ContentType {
		panic("ContentType must be specified.")
	}
	if ch.RequestTimeout <= 0 {
		ch.RequestTimeout = DefaultRequestTimeout
	}
	if ch.PendingRequests <= 0 {
		ch.PendingRequests = DefaultPendingMessages
	}
}