package notify

import (
	"context"
	"sync"
	"sync/atomic"
)

func sessionIsAlive(alive *atomic.Value) (ok bool) {
	if alive == nil {
		return false
	}
	defer func() {
		if recover() != nil {
			ok = false
		}
	}()
	value := alive.Load()
	flag, _ := value.(bool)
	return flag
}

func sessionMarkStarted(alive *atomic.Value, locker sync.Locker, status *Status) {
	if alive != nil {
		alive.Store(true)
	}
	withSessionStatusLock(locker, func() {
		if status == nil {
			return
		}
		*status = Status{
			Alive:  true,
			Reason: "",
			Err:    nil,
		}
	})
}

func sessionMarkStopped(alive *atomic.Value, locker sync.Locker, status *Status, reason string, err error, stopFn context.CancelFunc, cleanupFns ...func()) {
	if alive != nil {
		alive.Store(false)
	}
	withSessionStatusLock(locker, func() {
		if status == nil {
			return
		}
		*status = Status{
			Alive:  false,
			Reason: reason,
			Err:    err,
		}
	})
	for _, cleanupFn := range cleanupFns {
		if cleanupFn != nil {
			cleanupFn()
		}
	}
	if stopFn != nil {
		stopFn()
	}
}

func sessionStopChan(stopCtx context.Context) <-chan struct{} {
	if stopCtx == nil {
		return nil
	}
	return stopCtx.Done()
}

func sessionStatusValue(locker sync.Locker, status *Status) Status {
	var snapshot Status
	withSessionStatusLock(locker, func() {
		if status == nil {
			return
		}
		snapshot = *status
	})
	return snapshot
}

func withSessionStatusLock(locker sync.Locker, fn func()) {
	if locker != nil {
		locker.Lock()
		defer locker.Unlock()
	}
	fn()
}

func (c *ClientCommon) markSessionStarted() {
	c.markClientSessionStarted()
	sessionMarkStarted(&c.alive, &c.mu, &c.status)
}

func (c *ClientCommon) markSessionStopped(reason string, err error) {
	c.markClientSessionStopping()
	sessionMarkStopped(&c.alive, &c.mu, &c.status, reason, err, c.clientStopFuncSnapshot(),
		c.clearClientSessionRuntimeTransport,
		c.clearClientSessionRuntimeQueue,
		c.cleanupClientSessionResources,
	)
	c.markClientSessionStopped()
}

func (s *ServerCommon) markSessionStarted() {
	s.markServerSessionStarted()
	sessionMarkStarted(&s.alive, &s.mu, &s.status)
}

func (s *ServerCommon) markSessionStopped(reason string, err error) {
	s.markServerSessionStopping()
	sessionMarkStopped(&s.alive, &s.mu, &s.status, reason, err, s.serverStopFuncSnapshot(),
		s.clearServerSessionRuntimeTransport,
		s.clearServerSessionRuntimeQueue,
		s.cleanupServerSessionResources,
	)
	s.markServerSessionStopped()
}

func (c *ClientConn) markSessionStarted() {
	c.markClientConnLogicalSessionStarted()
}

func (c *ClientConn) markSessionStopped(reason string, err error) {
	c.markClientConnLogicalSessionStopped(reason, err)
}

func (c *ClientCommon) cleanupClientSessionResources() {
	if c == nil {
		return
	}
	state := c.getLogicalSessionState()
	state.pendingWaits.closeAll()
	state.fileAckWaits.closeAll()
	state.signalAckWaits.closeAll()
	state.receivedSignals.closeAll()
	state.transfers.closeAll(errServiceShutdown)
	if runtime := c.getStreamRuntime(); runtime != nil {
		runtime.closeAll(errServiceShutdown)
	}
	if runtime := c.getBulkRuntime(); runtime != nil {
		runtime.closeAll(errServiceShutdown)
	}
}

func (s *ServerCommon) cleanupServerSessionResources() {
	if s == nil {
		return
	}
	state := s.getLogicalSessionState()
	state.pendingWaits.closeAll()
	state.fileAckWaits.closeAll()
	state.signalAckWaits.closeAll()
	state.receivedSignals.closeAll()
	state.transfers.closeAll(errServiceShutdown)
	if runtime := s.getStreamRuntime(); runtime != nil {
		runtime.closeAll(errServiceShutdown)
	}
	if runtime := s.getBulkRuntime(); runtime != nil {
		runtime.closeAll(errServiceShutdown)
	}
}