package server

import (
	"net"

	"github.com/ouqiang/gocron/modules/rpc/auth"
	pb "github.com/ouqiang/gocron/modules/rpc/proto"
	"github.com/ouqiang/gocron/modules/utils"
	"golang.org/x/net/context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	"google.golang.org/grpc/grpclog"
)

type Server struct{}

func (s Server) Run(ctx context.Context, req *pb.TaskRequest) (*pb.TaskResponse, error) {
	defer func() {
		if err := recover(); err != nil {
			grpclog.Println(err)
		}
	}()
	output, err := utils.ExecShell(ctx, req.Command)
	resp := new(pb.TaskResponse)
	resp.Output = output
	if err != nil {
		resp.Error = err.Error()
	} else {
		resp.Error = ""
	}

	return resp, nil
}

func Start(addr string, enableTLS bool, certificate auth.Certificate) {
	l, err := net.Listen("tcp", addr)
	if err != nil {
		grpclog.Fatal(err)
	}

	var s *grpc.Server
	if enableTLS {
		tlsConfig, err := certificate.GetTLSConfigForServer()
		if err != nil {
			grpclog.Fatal(err)
		}
		opt := grpc.Creds(credentials.NewTLS(tlsConfig))
		s = grpc.NewServer(opt)
		pb.RegisterTaskServer(s, Server{})
		grpclog.Printf("listen %s with TLS", addr)
	} else {
		s = grpc.NewServer()
		pb.RegisterTaskServer(s, Server{})
		grpclog.Printf("listen %s", addr)
	}

	err = s.Serve(l)
	grpclog.Fatal(err)
}