package service

import (
	"context"
	"fmt"
	"github.com/fox/fox/ksync"
	"github.com/fox/fox/log"
	"github.com/fox/fox/safeChan"
	"github.com/fox/fox/timer"
	"time"
)

type BaseService struct {
	*timer.Timer
	type_ string
	name  string

	onFunc IOnFunc
	sender ISender

	msg          *safeChan.SafeChan[[]byte]
	job          *safeChan.SafeChan[func()]
	stop         context.Context
	stopFunc     context.CancelFunc
	waitStop     context.Context
	waitStopFunc context.CancelFunc
}

func NewBaseService(type_, name string, onFunc IOnFunc, sender ISender) *BaseService {
	s := &BaseService{
		type_:  type_,
		name:   name,
		Timer:  timer.NewTimer(),
		onFunc: onFunc,
		sender: sender,

		msg: safeChan.NewSafeChan[[]byte](128),
		job: safeChan.NewSafeChan[func()](128),
	}
	s.stop, s.stopFunc = context.WithCancel(context.Background())
	s.waitStop, s.waitStopFunc = context.WithCancel(context.Background())

	s.Run()
	return s
}

func (s *BaseService) Name() string {
	return s.name
}

func (s *BaseService) Type() string {
	return s.type_
}

func (s *BaseService) Write(msg []byte) error {
	return s.msg.Write(msg)
}

func (s *BaseService) RunOnce(cb func()) {
	select {
	case <-s.stop.Done():
		log.Error(s.Log("want stop, can not call RunOnce function"))
		return
	default:
		_ = s.job.Write(cb)
	}
}

func (s *BaseService) RunWait(cb func() (retValue any)) (retValue any, err error) {
	select {
	case <-s.stop.Done():
		err = fmt.Errorf(s.Log("want stop, can not call RunOnce function"))
		log.Error(err.Error())
		return nil, err
	default:
		wait := make(chan any, 2)
		err = s.job.Write(func() {
			retValue = cb()
			wait <- retValue
		})
		if err == nil {
			select {
			case retValue = <-wait:
				return retValue, nil
			case <-time.After(time.Second * time.Duration(30)):
				return nil, fmt.Errorf("timeout fail")
			}
		}
		return nil, err
	}
}

func (s *BaseService) Send(topic string, msg []byte) error {
	if s.sender != nil {
		return s.sender.Send(topic, msg)
	}
	return s.Err("send is nil")
}
func (s *BaseService) Call(topic string, timeout time.Duration, msg []byte) ([]byte, error) {
	if s.sender != nil {
		return s.sender.Call(topic, timeout, msg)
	}
	return nil, s.Err("call is nil")
}

func (s *BaseService) WaitStop() {
	select {
	case <-s.waitStop.Done():
		return
	}
}

func (s *BaseService) NotifyStop() {
	s.stopFunc()
	// log.Debug(fmt.Sprintf("notify %v service stop", s.name))
}

func (s *BaseService) allChanEmpty() bool {
	if s.job.Size() == 0 && s.msg.Size() == 0 {
		return true
	}
	return false
}

func (s *BaseService) canStop() bool {
	select {
	case <-s.stop.Done():
		if s.allChanEmpty() {
			return true
		}
		return false
	default:
		return false
	}
}

func (s *BaseService) run() {
	for {
		if s.canStop() {
			if s.onFunc != nil {
				s.onFunc.OnStop()
				s.waitStopFunc()
			}
			break
		}
		select {
		case msg, ok := <-s.msg.Reader():
			if ok && s.onFunc != nil {
				_ = s.onFunc.OnMessage(msg)
			}
		case cb, ok := <-s.job.Reader():
			if ok && cb != nil {
				cb()
			}
		case t, ok := <-s.Timer.Reader():
			if ok && t != nil && t.Func != nil {
				t.Func()
			}
		case _ = <-s.stop.Done():
			if s.onFunc != nil {
				s.msg.Close()
				s.job.Close()
				s.Timer.CancelAllTimer()
				s.Timer.Close()
			}
		}
	}
}

func (s *BaseService) Run() {
	ksync.GoSafe(s.run, s.Run)
}

func (s *BaseService) Log(format string, a ...any) string {
	head := fmt.Sprintf("service:%v-%v ", s.type_, s.name)
	return head + fmt.Sprintf(format, a...)
}

func (s *BaseService) Err(format string, a ...any) error {
	head := fmt.Sprintf("service:%v-%v ", s.type_, s.name)
	return fmt.Errorf(head + fmt.Sprintf(format, a...))
}