// Copyright 2015 The etcd Authors
//
// 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 main

import (
	"fmt"
	"net"
	"net/http"
	"net/rpc"
	"syscall"

	"github.com/coreos/etcd/tools/functional-tester/etcd-agent/client"
)

func (a *Agent) serveRPC(port string) {
	rpc.Register(a)
	rpc.HandleHTTP()
	l, e := net.Listen("tcp", port)
	if e != nil {
		plog.Fatal(e)
	}
	plog.Println("agent listening on", port)
	go http.Serve(l, nil)
}

func (a *Agent) RPCStart(args []string, pid *int) error {
	plog.Printf("start etcd with args %v", args)
	err := a.start(args...)
	if err != nil {
		plog.Println("error starting etcd", err)
		return err
	}
	*pid = a.cmd.Process.Pid
	return nil
}

func (a *Agent) RPCStop(args struct{}, reply *struct{}) error {
	plog.Printf("stop etcd")
	err := a.stopWithSig(syscall.SIGTERM)
	if err != nil {
		plog.Println("error stopping etcd", err)
		return err
	}
	return nil
}

func (a *Agent) RPCRestart(args struct{}, pid *int) error {
	plog.Printf("restart etcd")
	err := a.restart()
	if err != nil {
		plog.Println("error restarting etcd", err)
		return err
	}
	*pid = a.cmd.Process.Pid
	return nil
}

func (a *Agent) RPCCleanup(args struct{}, reply *struct{}) error {
	plog.Printf("cleanup etcd")
	err := a.cleanup()
	if err != nil {
		plog.Println("error cleaning up etcd", err)
		return err
	}
	return nil
}

func (a *Agent) RPCTerminate(args struct{}, reply *struct{}) error {
	plog.Printf("terminate etcd")
	err := a.terminate()
	if err != nil {
		plog.Println("error terminating etcd", err)
	}
	return nil
}

func (a *Agent) RPCDropPort(port int, reply *struct{}) error {
	plog.Printf("drop port %d", port)
	err := a.dropPort(port)
	if err != nil {
		plog.Println("error dropping port", err)
	}
	return nil
}

func (a *Agent) RPCRecoverPort(port int, reply *struct{}) error {
	plog.Printf("recover port %d", port)
	err := a.recoverPort(port)
	if err != nil {
		plog.Println("error recovering port", err)
	}
	return nil
}

func (a *Agent) RPCSetLatency(args []int, reply *struct{}) error {
	if len(args) != 2 {
		return fmt.Errorf("SetLatency needs two args, got (%v)", args)
	}
	plog.Printf("set latency of %dms (+/- %dms)", args[0], args[1])
	err := a.setLatency(args[0], args[1])
	if err != nil {
		plog.Println("error setting latency", err)
	}
	return nil
}

func (a *Agent) RPCRemoveLatency(args struct{}, reply *struct{}) error {
	plog.Println("removing latency")
	err := a.setLatency(0, 0)
	if err != nil {
		plog.Println("error removing latency")
	}
	return nil
}

func (a *Agent) RPCStatus(args struct{}, status *client.Status) error {
	*status = a.status()
	return nil
}