package xmppsig

import (
	"context"

	"dev.narayana.im/narayana/telegabber/calls/signaling"
	"dev.narayana.im/narayana/telegabber/xmpp/jingle"

	log "github.com/sirupsen/logrus"
)

// xmpp-side Callee for XMPP-originated calls; the gateway is the JMI responder
type Callee struct {
	xmppBase
}

func (c *Callee) Ringing() {
	sess := c.sessionRef()
	if sess == nil || sess.State() != jingle.StateRinging {
		return
	}
	if err := sess.Ringing(context.Background()); err != nil {
		log.WithField("remote", c.remote).WithError(err).Debug("xmppsig.Callee.Ringing: send failed")
	}
}

func (c *Callee) Accept() {
	sess := c.sessionRef()
	if sess == nil {
		return
	}
	if err := sess.AcceptProposal(context.Background()); err != nil {
		log.WithField("remote", c.remote).WithError(err).Error("xmppsig.Callee.Accept: AcceptProposal failed")
		if b := c.bridgeRef(); b != nil {
			go b.Terminate(signaling.ReasonUnknown)
		}
	}
}

// pick the right verb for the current session state: Close, Decline, or
// session-terminate
func (c *Callee) Terminate(reason signaling.TerminationReason) {
	sess := c.sessionRef()
	cond := mapReason(reason)
	var err error
	switch sess.State() {
	case jingle.StateNew:
		err = sess.Close()
	case jingle.StateRinging:
		err = sess.Decline(context.Background(), cond)
	case jingle.StateTerminated:
		// already torn down
	default:
		err = sess.Terminate(context.Background(), cond)
	}
	if err != nil {
		log.WithError(err).Debug("xmppsig.Callee.Terminate: tear-down send failed")
	}
	c.cleanup()
}

// never fire on the responder side
func (c *Callee) OnRinging(_ string)   {}
func (c *Callee) OnProceeded(_ string) {}

func (c *Callee) OnRemoteDescriptionApplied(sdp string) {
	c.onRemoteDescription(sdp)
}

func (c *Callee) OnTerminated(reason string) {
	if b := c.bridgeRef(); b != nil {
		go b.Terminate(reasonFromCondition(reason))
	}
	c.cleanup()
}