package notify

import (
	"context"
	"fmt"
	"os"
	"sync/atomic"
	"time"
)

func (c *ClientCommon) send(msg TransferMsg) (WaitMsg, error) {
	if err := c.ensureClientSendReady(); err != nil {
		return WaitMsg{}, err
	}
	var wait WaitMsg
	if msg.Type != MSG_SYNC_REPLY && msg.Type != MSG_KEY_CHANGE && msg.Type != MSG_SYS_REPLY || msg.ID == 0 {
		msg.ID = atomic.AddUint64(&c.msgID, 1)
	}
	env, err := wrapTransferMsgEnvelope(msg, c.sequenceEn)
	if err != nil {
		return WaitMsg{}, err
	}
	if requiresSignalReplyWait(msg) {
		wait = c.getPendingWaitPool().createAndStore(msg)
	}
	err = c.sendSignalEnvelopeMaybeReliable(env, msg)
	if err != nil {
		if requiresSignalReplyWait(msg) {
			c.getPendingWaitPool().removeAndClose(msg.ID)
		}
		return WaitMsg{}, err
	}
	return wait, err
}

func (c *ClientCommon) sendEnvelope(env Envelope) error {
	if err := c.ensureClientSendReady(); err != nil {
		return err
	}
	payload, err := c.encodeEnvelopePayload(env)
	if err != nil {
		return err
	}
	if batchedControlEnvelope(env) {
		return c.writeControlPayloadToTransport(payload)
	}
	return c.writePayloadToTransport(payload)
}

func (c *ClientCommon) dispatchEnvelope(env Envelope, now time.Time) {
	switch env.Kind {
	case EnvelopeSignalAck:
		if c.handleSignalAckEnvelope(env) {
			return
		}
	case EnvelopeStreamData:
		c.dispatchStreamEnvelope(env)
		return
	case EnvelopeSignal:
		transfer, err := unwrapTransferMsgEnvelope(env, c.sequenceDe)
		if err != nil {
			if c.showError || c.debugMode {
				fmt.Println("client unwrap signal envelope error", err)
			}
			return
		}
		if c.handleReceivedSignalReliability(transfer) {
			return
		}
		message := Message{
			ServerConn:  c,
			TransferMsg: transfer,
			NetType:     NET_CLIENT,
			Time:        now,
		}
		c.dispatchMsg(message)
	case EnvelopeFileMeta, EnvelopeFileChunk, EnvelopeFileEnd, EnvelopeFileAbort, EnvelopeAck:
		c.dispatchFileEnvelope(env, now)
	default:
	}
}

func (c *ClientCommon) Send(key string, value MsgVal) error {
	_, err := c.send(TransferMsg{
		Key:   key,
		Value: value,
		Type:  MSG_ASYNC,
	})
	return err
}

func (c *ClientCommon) sendWait(msg TransferMsg, timeout time.Duration) (Message, error) {
	data, err := c.send(msg)
	if err != nil {
		return Message{}, err
	}
	stopCh := sessionStopChan(c.clientStopContextSnapshot())
	if timeout.Seconds() == 0 {
		msg, ok := <-data.Reply
		if !ok {
			return msg, pendingWaitClosedErrorWith(stopCh, clientTransportDetachedError(c))
		}
		return msg, nil
	}
	select {
	case <-time.After(timeout):
		c.getPendingWaitPool().removeAndClose(data.TransferMsg.ID)
		return Message{}, os.ErrDeadlineExceeded
	case <-stopCh:
		return Message{}, errServiceShutdown
	case msg, ok := <-data.Reply:
		if !ok {
			return msg, pendingWaitClosedErrorWith(stopCh, clientTransportDetachedError(c))
		}
		return msg, nil
	}
}

func (c *ClientCommon) sendCtx(msg TransferMsg, ctx context.Context) (Message, error) {
	data, err := c.send(msg)
	if err != nil {
		return Message{}, err
	}
	stopCh := sessionStopChan(c.clientStopContextSnapshot())
	if ctx == nil {
		ctx = context.Background()
	}
	select {
	case <-ctx.Done():
		c.getPendingWaitPool().removeAndClose(data.TransferMsg.ID)
		return Message{}, normalizeStreamDeadlineError(ctx.Err())
	case <-stopCh:
		return Message{}, errServiceShutdown
	case msg, ok := <-data.Reply:
		if !ok {
			return msg, pendingWaitClosedErrorWith(stopCh, clientTransportDetachedError(c))
		}
		return msg, nil
	}
}

func (c *ClientCommon) SendObjCtx(ctx context.Context, key string, val interface{}) (Message, error) {
	data, err := c.sequenceEn(val)
	if err != nil {
		return Message{}, err
	}
	return c.sendCtx(TransferMsg{
		Key:   key,
		Value: data,
		Type:  MSG_SYNC_ASK,
	}, ctx)
}

func (c *ClientCommon) SendObj(key string, val interface{}) error {
	data, err := encode(val)
	if err != nil {
		return err
	}
	_, err = c.send(TransferMsg{
		Key:   key,
		Value: data,
		Type:  MSG_ASYNC,
	})
	return err
}

func (c *ClientCommon) SendCtx(ctx context.Context, key string, value MsgVal) (Message, error) {
	return c.sendCtx(TransferMsg{
		Key:   key,
		Value: value,
		Type:  MSG_SYNC_ASK,
	}, ctx)
}

func (c *ClientCommon) SendWait(key string, value MsgVal, timeout time.Duration) (Message, error) {
	return c.sendWait(TransferMsg{
		Key:   key,
		Value: value,
		Type:  MSG_SYNC_ASK,
	}, timeout)
}

func (c *ClientCommon) SendWaitObj(key string, value interface{}, timeout time.Duration) (Message, error) {
	data, err := c.sequenceEn(value)
	if err != nil {
		return Message{}, err
	}
	return c.SendWait(key, data, timeout)
}

func (c *ClientCommon) Reply(m Message, value MsgVal) error {
	return m.Reply(value)
}