package main

import (
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"net/http"
	"os"
	"strconv"
	"time"

	"rtu_linux_services/servicelib"

	"github.com/kardianos/service"

	"hnyfkj.com.cn/rtu/linux/baseapp"
	"hnyfkj.com.cn/rtu/linux/netmgrd"
	"hnyfkj.com.cn/rtu/linux/utils/jsonrpc2"
)

var (
	Version    = "0.0.0.1"
	BuildTime  = ""
	ListenPort = "7000"
)

type program struct {
	name        string
	core_server *jsonrpc2.RPCServer
	http_server *http.Server
	done        chan struct{}
}

// Start should not block. Do the actual work async.
func (p *program) Start(s service.Service) error {
	baseapp.InitPath()
	logCfgFile, err := servicelib.EnsureDefaultLogConfig()
	if err != nil {
		return err
	}

	baseapp.InitLogger(logCfgFile)
	baseapp.Logger.Infof("App Version: %s, Build Time: %s", Version, BuildTime)

	if !netmgrd.ModemInit() {
		return errors.New("modem init failed")
	}

	netmgrd.SetTimeSyncEnabled(false) // 关闭时间同步, 由"timesyncd.service"完成
	netmgrd.ModuleInit()

	p.core_server, err = jsonrpc2.NewRPCServer(p.name, baseapp.Logger)
	if err != nil {
		return err
	}

	methods := make(jsonrpc2.MethodMap)

	////////////////////////////////////////////////////////////
	methods["basic.getBuildVer"] = p.getBuildVer /// 获取软件版本
	methods["basic.getLogLevel"] = p.getLogLevel /// 获取日志级别
	methods["basic.setLogLevel"] = p.setLogLevel /// 设置日志级别
	methods["basic.saveLogConf"] = p.saveLogConf /// 保存日志设置
	////////////////////////////////////////////////////////////
	methods["core.getModemInfo"] = p.getModemInfo // IMEI、ICCID
	methods["core.getNetStatus"] = p.getNetStatus // 联网状态信息
	////////////////////////////////////////////////////////////

	err = p.core_server.RegisterMethods(methods)
	if err != nil {
		return err
	}

	mux := http.NewServeMux()
	mux.Handle("/rpc", p.core_server)

	p.http_server = &http.Server{
		Addr:    "127.0.0.1:" + ListenPort,
		Handler: mux,
	}

	p.done = make(chan struct{})

	go p.run()

	return nil
}

// Do work here
func (p *program) run() {
	defer close(p.done)

	baseapp.Logger.Infof(
		"[%s] http server starting on %s...",
		p.name,
		p.http_server.Addr,
	)

	err := p.http_server.ListenAndServe() // 同步阻塞

	if err != nil && !errors.Is(err, http.ErrServerClosed) {
		baseapp.Logger.Errorf("[%s] start http server error: %v", p.name, err)
		return
	}
}

// Stop should not block. Return with a few seconds.
func (p *program) Stop(s service.Service) error {
	if p.core_server != nil {
		p.core_server.Stop()
	}

	if p.http_server != nil {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()

		_ = p.http_server.Shutdown(ctx)
	}

	if p.done != nil {
		<-p.done
	}

	netmgrd.ModemExit()
	baseapp.ExitLogger()
	return nil
}

func (p *program) getBuildVer(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	result := map[string]string{
		"version":    Version,
		"build_time": BuildTime,
	}
	return jsonrpc2.BuildResponse(req, result, nil)
}

func (p *program) getLogLevel(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	level, _ := baseapp.GetLogLevel()
	result := map[string]string{
		"log_level": level,
	}
	return jsonrpc2.BuildResponse(req, result, nil)
}

func (p *program) setLogLevel(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	var params map[string]string
	if err := json.Unmarshal(req.Params, &params); err != nil {
		return jsonrpc2.BuildError(req, jsonrpc2.ErrInvalidParams, err.Error())
	}

	level, ok := params["log_level"]
	if !ok || level == "" {
		return jsonrpc2.BuildError(req, jsonrpc2.ErrInvalidParams, "missing or empty 'log_level' parameter")
	}

	err := baseapp.UpdateLogLevel(level)
	if err != nil {
		return jsonrpc2.BuildError(req, jsonrpc2.ErrInternal, err.Error())
	}

	return jsonrpc2.BuildResponse(req, "success", nil)
}

func (p *program) saveLogConf(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	err := baseapp.SaveLogConfig()
	if err != nil {
		return jsonrpc2.BuildError(req, jsonrpc2.ErrInternal, err.Error())
	}

	return jsonrpc2.BuildResponse(req, "success", nil)
}

func (p *program) getModemInfo(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	result := map[string]string{
		"imei":  netmgrd.GetIMEI(),
		"iccid": netmgrd.GetSimICCID(),
		"rssi":  netmgrd.GetRSSI(),
	}
	return jsonrpc2.BuildResponse(req, result, nil)
}

func (p *program) getNetStatus(ctx context.Context, req *jsonrpc2.Request) *jsonrpc2.Response {
	result := map[string]string{
		"net_available": strconv.FormatBool(netmgrd.IsInetAvailable()),
		"net_type":      netmgrd.GetCurrentNetType().String(),
	}
	return jsonrpc2.BuildResponse(req, result, nil)
}

func main() {
	svcFlag := flag.String("service", "", "Control the system service.")
	flag.Parse()

	svcConfig := &service.Config{
		Name:        "yfkj-networkd",
		DisplayName: "yfkj-networkd",
		Description: "Network connectivity management",
		Option: map[string]any{
			"Restart": "always", // 无条件重启
		},
	}

	prg := &program{
		name: "NetworkManager",
	}

	svc, err := service.New(prg, svcConfig)
	if err != nil {
		fmt.Printf("%s.service creation failed: %v\n",
			svcConfig.Name, err)
		os.Exit(1)
	}

	if len(*svcFlag) != 0 {
		err := service.Control(svc, *svcFlag)
		if err != nil {
			fmt.Printf("%v\n Valid actions: %q\n", err, service.ControlAction)
		}
		os.Exit(0)
	}

	if servicelib.IsPortInUse(ListenPort) { // 查询端口占用，避免运行多份实例
		fmt.Printf(
			"%s.service start failed: listen port %s already in use\n",
			svcConfig.Name, ListenPort,
		)
		os.Exit(1)
	}

	if err := svc.Run(); err != nil {
		fmt.Printf("%s.service run failed: %v\n",
			svcConfig.Name, err)
		os.Exit(1)
	}
}