package auth

import (
	"fmt"
	"path"
	"sync"

	cc "git.loafle.net/commons_go/config"
	"git.loafle.net/commons_go/logging"
	crr "git.loafle.net/commons_go/rpc/registry"
	ooccn "git.loafle.net/overflow/overflow_commons_go/config/noauthprobe"
	oogwc "git.loafle.net/overflow/overflow_gateway_websocket/client"
	"git.loafle.net/overflow/overflow_probes/auth/client"
	oopar "git.loafle.net/overflow/overflow_probes/auth/rpc"
	"git.loafle.net/overflow/overflow_probes/config"
)

type Auther interface {
	EndableStart(doneChan chan<- error) error
	Stop()
}

type auth struct {
	doneChan chan<- error

	cClient oogwc.Client

	configPath string
	config     ooccn.NoAuthProbeConfig

	serviceDoneChan chan error

	stopChan chan struct{}
	stopWg   sync.WaitGroup
}

func New() Auther {
	a := &auth{}

	return a
}

func (a *auth) EndableStart(doneChan chan<- error) error {
	if nil != a.stopChan {
		logging.Logger().Panic("Auth: auth is already running. Stop it before starting it again")
	}

	a.configPath = path.Join(*config.ConfigDir, ooccn.ConfigFileName)

	conf := cc.New()
	if cc.Exists(a.configPath) {
		if err := conf.Load(&a.config, a.configPath); nil != err {
			return fmt.Errorf("Auth: Loading of NoAuth config file[%s] failed error[%v]", a.configPath, err)
		}
	}

	if nil != a.config.DenyDate {
		return fmt.Errorf("Cannot start because this probe have been denied from overFlow at %s", a.config.DenyDate.String())
	}

	a.serviceDoneChan = make(chan error, 1)

	rpcRegistry := crr.NewRPCRegistry()

	napService := &oopar.NoAuthProbeService{
		DoneChan:   a.serviceDoneChan,
		ConfigPath: a.configPath,
		Config:     a.config,
	}
	rpcRegistry.RegisterService(napService, "")

	ch := client.NewClientHandler(rpcRegistry)
	sb := client.NewSocketBuilder(napService)
	if nil == sb {
		return fmt.Errorf("Auth: Cannot create SocketBuilder")
	}
	a.cClient = client.NewClient(ch, sb)

	a.doneChan = doneChan
	a.stopChan = make(chan struct{})

	a.stopWg.Add(1)
	go a.handleAuth()

	return nil
}

func (a *auth) Stop() {
	a.destroy(nil)
}

func (a *auth) destroy(err error) {
	if a.stopChan == nil {
		logging.Logger().Warn("Auth: auth must be started before stopping it")
	}
	close(a.stopChan)
	a.stopWg.Wait()
	a.stopChan = nil

	a.cClient.Close()
	close(a.serviceDoneChan)

	logging.Logger().Info(fmt.Sprintf("Auth: stopped"))
	a.doneChan <- err
}

func (a *auth) handleAuth() {
	var err error
	defer func() {
		a.stopWg.Done()
		a.destroy(err)
	}()

	if err = a.cClient.Connect(); nil != err {
		return
	}

	for {
		select {
		case err = <-a.serviceDoneChan:
			return
		case <-a.stopChan:
			return
		}
	}
}