/*
Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
Copyright (C) ITsysCOM GmbH

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

package engine

import (
	"fmt"
	"strings"
	"time"

	"github.com/cgrates/cgrates/config"
	"github.com/cgrates/cgrates/utils"
	"github.com/cgrates/rpcclient"
)

func NewRPCPool(dispatchStrategy string, keyPath, certPath, caPath string, connAttempts, reconnects int,
	connectTimeout, replyTimeout time.Duration, rpcConnCfgs []*config.RemoteHost,
	internalConnChan chan rpcclient.RpcClientConnection, lazyConnect bool) (*rpcclient.RpcClientPool, error) {
	var rpcClient *rpcclient.RpcClient
	var err error
	rpcPool := rpcclient.NewRpcClientPool(dispatchStrategy, replyTimeout)
	atLestOneConnected := false // If one connected we don't longer return errors
	for _, rpcConnCfg := range rpcConnCfgs {
		if rpcConnCfg.Address == utils.MetaInternal {
			rpcClient, err = rpcclient.NewRpcClient("", "", rpcConnCfg.TLS, keyPath, certPath, caPath, connAttempts,
				reconnects, connectTimeout, replyTimeout, rpcclient.INTERNAL_RPC, internalConnChan, lazyConnect)
		} else if utils.SliceHasMember([]string{utils.EmptyString, utils.MetaGOB, utils.MetaJSON}, rpcConnCfg.Transport) {
			codec := utils.GOB
			if rpcConnCfg.Transport != "" {
				codec = rpcConnCfg.Transport[1:] // Transport contains always * before codec understood by rpcclient
			}
			rpcClient, err = rpcclient.NewRpcClient("tcp", rpcConnCfg.Address, rpcConnCfg.TLS, keyPath, certPath, caPath,
				connAttempts, reconnects, connectTimeout, replyTimeout, codec, nil, lazyConnect)
		} else {
			return nil, fmt.Errorf("Unsupported transport: <%s>", rpcConnCfg.Transport)
		}
		if err == nil {
			atLestOneConnected = true
		}
		rpcPool.AddClient(rpcClient)
	}
	if atLestOneConnected {
		err = nil
	}
	return rpcPool, err
}

var IntRPC *RPCClientSet

func NewRPCClientSet() (s *RPCClientSet) {
	return &RPCClientSet{set: make(map[string]*rpcclient.RpcClient)}
}

type RPCClientSet struct {
	set map[string]*rpcclient.RpcClient
}

func (s *RPCClientSet) AddRPCClient(name string, rpc *rpcclient.RpcClient) {
	s.set[name] = rpc
}

func (s *RPCClientSet) AddRPCConnection(name, transport, addr string, tls bool,
	key_path, cert_path, ca_path string, connectAttempts, reconnects int,
	connTimeout, replyTimeout time.Duration, codec string,
	internalChan chan rpcclient.RpcClientConnection, lazyConnect bool) error {
	rpc, err := rpcclient.NewRpcClient(transport, addr, tls, key_path, cert_path,
		ca_path, connectAttempts, reconnects, connTimeout, replyTimeout,
		codec, internalChan, lazyConnect)
	if err != nil {
		return err
	}
	s.AddRPCClient(name, rpc)
	return nil
}

func (s *RPCClientSet) AddInternalRPCClient(name string, connChan chan rpcclient.RpcClientConnection) {
	err := s.AddRPCConnection(name, utils.EmptyString, utils.EmptyString,
		false, utils.EmptyString, utils.EmptyString, utils.EmptyString,
		config.CgrConfig().GeneralCfg().ConnectAttempts, config.CgrConfig().GeneralCfg().Reconnects,
		config.CgrConfig().GeneralCfg().ConnectTimeout, config.CgrConfig().GeneralCfg().ReplyTimeout,
		rpcclient.INTERNAL_RPC, connChan, true)
	if err != nil {
		utils.Logger.Err(fmt.Sprintf("<InternalRCP> Error adding %s to the set: %v", name, err.Error()))
	}
}

func (s *RPCClientSet) GetInternalChanel() chan rpcclient.RpcClientConnection {
	connChan := make(chan rpcclient.RpcClientConnection, 1)
	connChan <- s
	return connChan
}

func (s *RPCClientSet) Call(method string, args interface{}, reply interface{}) error {
	methodSplit := strings.Split(method, ".")
	if len(methodSplit) != 2 {
		return rpcclient.ErrUnsupporteServiceMethod
	}
	conn, has := s.set[methodSplit[0]]
	if !has {
		return rpcclient.ErrUnsupporteServiceMethod
	}
	return conn.Call(method, args, reply)
}