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 Caller for TG-originated calls; the gateway is the JMI initiator
type Caller struct {
	xmppBase
}

// invoked by Bridge under its mutex; bridge re-entry must be deferred
func (c *Caller) Start() {
	sess := c.sessionRef()
	entry := log.WithFields(log.Fields{
		"sid":       sess.SID(),
		"remote":    c.remote,
		"local_jid": c.localJID,
	})

	c.a.cfg.Manager.Register(sess)

	if err := sess.Propose(context.Background()); err != nil {
		entry.WithError(err).Error("xmppsig.Caller.Start: Session.Propose failed")
		if b := c.bridgeRef(); b != nil {
			go b.Terminate(signaling.ReasonUnknown)
		}
		return
	}
}

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

// jingle.SessionObserver

func (c *Caller) OnRinging(_ string) {
	if b := c.bridgeRef(); b != nil {
		go b.Ringing()
	}
}

func (c *Caller) OnProceeded(_ string) {
	if b := c.bridgeRef(); b != nil {
		go b.CalleeAccepted()
	}
}

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

// the local Terminate then no-ops on the wire because the session is
// already StateTerminated; cleanup runs early to shorten the window
// the session stays registered
func (c *Caller) OnTerminated(reason string) {
	if b := c.bridgeRef(); b != nil {
		go b.Terminate(reasonFromCondition(reason))
	}
	c.cleanup()
}