package jingle

import (
	"encoding/xml"

	"gosrc.io/xmpp/stanza"
)

// supported Jingle actions; content-*, security-info, transport-*,
// description-info are intentionally not supported
const (
	ActionSessionInitiate  = "session-initiate"
	ActionSessionAccept    = "session-accept"
	ActionSessionTerminate = "session-terminate"
	ActionTransportInfo    = "transport-info"
)

const (
	ReasonSuccess                 = "success"
	ReasonBusy                    = "busy"
	ReasonDecline                 = "decline"
	ReasonCancel                  = "cancel"
	ReasonGone                    = "gone"
	ReasonFailedTransport         = "failed-transport"
	ReasonFailedApplication       = "failed-application"
	ReasonIncompatibleParameters  = "incompatible-parameters"
	ReasonUnsupportedTransports   = "unsupported-transports"
	ReasonUnsupportedApplications = "unsupported-applications"
	ReasonGeneralError            = "general-error"
	ReasonTimeout                 = "timeout"
	ReasonConnectivityError       = "connectivity-error"
)

type JingleIQ struct {
	XMLName   xml.Name  `xml:"urn:xmpp:jingle:1 jingle"`
	Action    string    `xml:"action,attr"`
	Initiator string    `xml:"initiator,attr,omitempty"`
	Responder string    `xml:"responder,attr,omitempty"`
	SID       string    `xml:"sid,attr"`
	Contents  []Content `xml:"urn:xmpp:jingle:1 content"`
	Group     *Group    `xml:"urn:xmpp:jingle:apps:grouping:0 group,omitempty"`
	Reason    *Reason   `xml:"urn:xmpp:jingle:1 reason,omitempty"`
}

func (j JingleIQ) Namespace() string         { return j.XMLName.Space }
func (j JingleIQ) GetSet() *stanza.ResultSet { return nil }

type Content struct {
	XMLName     xml.Name     `xml:"urn:xmpp:jingle:1 content"`
	Creator     string       `xml:"creator,attr"`
	Senders     string       `xml:"senders,attr,omitempty"`
	Name        string       `xml:"name,attr"`
	Disposition string       `xml:"disposition,attr,omitempty"`
	Description *Description `xml:"urn:xmpp:jingle:apps:rtp:1 description,omitempty"`
	Transport   *Transport   `xml:"urn:xmpp:jingle:transports:ice-udp:1 transport,omitempty"`
}

type Group struct {
	XMLName   xml.Name       `xml:"urn:xmpp:jingle:apps:grouping:0 group"`
	Semantics string         `xml:"semantics,attr"`
	Contents  []GroupContent `xml:"urn:xmpp:jingle:apps:grouping:0 content"`
}

type GroupContent struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:grouping:0 content"`
	Name    string   `xml:"name,attr"`
}

// preserves the inner condition element name and optional text;
// semantics handled in callers
type Reason struct {
	XMLName   xml.Name         `xml:"urn:xmpp:jingle:1 reason"`
	Condition *ReasonCondition `xml:",any"`
	Text      string           `xml:"urn:xmpp:jingle:1 text,omitempty"`
}

// whichever element appears under <reason>; local name is the condition
type ReasonCondition struct {
	XMLName xml.Name
}

type Description struct {
	XMLName          xml.Name          `xml:"urn:xmpp:jingle:apps:rtp:1 description"`
	Media            string            `xml:"media,attr"`
	SSRC             string            `xml:"ssrc,attr,omitempty"`
	PayloadTypes     []PayloadType     `xml:"urn:xmpp:jingle:apps:rtp:1 payload-type"`
	RTPHdrexts       []RTPHdrext       `xml:"urn:xmpp:jingle:apps:rtp:rtp-hdrext:0 rtp-hdrext"`
	ExtmapAllowMixed *ExtmapAllowMixed `xml:"urn:xmpp:jingle:apps:rtp:rtp-hdrext:0 extmap-allow-mixed,omitempty"`
	RtcpMux          *RtcpMux          `xml:"urn:xmpp:jingle:apps:rtp:1 rtcp-mux,omitempty"`
	RTCPFbs          []RTCPFb          `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb"`
	RTCPFbTrrInts    []RTCPFbTrrInt    `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb-trr-int"`
	Sources          []Source          `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 source"`
	SSRCGroups       []SSRCGroup       `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 ssrc-group"`
}

type PayloadType struct {
	XMLName       xml.Name       `xml:"urn:xmpp:jingle:apps:rtp:1 payload-type"`
	ID            string         `xml:"id,attr"`
	Name          string         `xml:"name,attr,omitempty"`
	Clockrate     string         `xml:"clockrate,attr,omitempty"`
	Channels      string         `xml:"channels,attr,omitempty"`
	Ptime         string         `xml:"ptime,attr,omitempty"`
	Maxptime      string         `xml:"maxptime,attr,omitempty"`
	Parameters    []Parameter    `xml:"urn:xmpp:jingle:apps:rtp:1 parameter"`
	RTCPFbs       []RTCPFb       `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb"`
	RTCPFbTrrInts []RTCPFbTrrInt `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb-trr-int"`
}

// name/value pair used under <payload-type> (rtp:1) and <source> (ssma);
// namespace is governed by the parent's tag, so XMLName has none
type Parameter struct {
	XMLName xml.Name `xml:"parameter"`
	Name    string   `xml:"name,attr"`
	Value   string   `xml:"value,attr,omitempty"`
}

type RTCPFb struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb"`
	Type    string   `xml:"type,attr"`
	Subtype string   `xml:"subtype,attr,omitempty"`
}

type RTCPFbTrrInt struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:rtcp-fb:0 rtcp-fb-trr-int"`
	Value   string   `xml:"value,attr"`
}

type RTPHdrext struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:rtp-hdrext:0 rtp-hdrext"`
	ID      string   `xml:"id,attr"`
	URI     string   `xml:"uri,attr"`
	Senders string   `xml:"senders,attr,omitempty"`
}

// presence flag, RFC 8285 §6
type ExtmapAllowMixed struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:rtp-hdrext:0 extmap-allow-mixed"`
}

// presence flag for RTCP mux
type RtcpMux struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:1 rtcp-mux"`
}

type Source struct {
	XMLName    xml.Name    `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 source"`
	SSRC       string      `xml:"ssrc,attr"`
	Parameters []Parameter `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 parameter"`
}

type SSRCGroup struct {
	XMLName   xml.Name          `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 ssrc-group"`
	Semantics string            `xml:"semantics,attr"`
	Sources   []SSRCGroupSource `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 source"`
}

type SSRCGroupSource struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:rtp:ssma:0 source"`
	SSRC    string   `xml:"ssrc,attr"`
}

type Transport struct {
	XMLName     xml.Name     `xml:"urn:xmpp:jingle:transports:ice-udp:1 transport"`
	Ufrag       string       `xml:"ufrag,attr,omitempty"`
	Pwd         string       `xml:"pwd,attr,omitempty"`
	Candidates  []Candidate  `xml:"urn:xmpp:jingle:transports:ice-udp:1 candidate"`
	Fingerprint *Fingerprint `xml:"urn:xmpp:jingle:apps:dtls:0 fingerprint,omitempty"`

	// well-known ICE options under gultsch.de namespace
	Trickle      *ICEOptionTrickle      `xml:"http://gultsch.de/xmpp/drafts/jingle/transports/ice-udp/option trickle,omitempty"`
	Renomination *ICEOptionRenomination `xml:"http://gultsch.de/xmpp/drafts/jingle/transports/ice-udp/option renomination,omitempty"`
}

type Candidate struct {
	XMLName    xml.Name `xml:"urn:xmpp:jingle:transports:ice-udp:1 candidate"`
	Foundation string   `xml:"foundation,attr"`
	Component  string   `xml:"component,attr"`
	Protocol   string   `xml:"protocol,attr"`
	Priority   string   `xml:"priority,attr"`
	IP         string   `xml:"ip,attr"`
	Port       string   `xml:"port,attr"`
	Type       string   `xml:"type,attr,omitempty"`
	Network    string   `xml:"network,attr,omitempty"`
	Generation string   `xml:"generation,attr,omitempty"`
	ID         string   `xml:"id,attr,omitempty"`
	RelAddr    string   `xml:"rel-addr,attr,omitempty"`
	RelPort    string   `xml:"rel-port,attr,omitempty"`
}

type Fingerprint struct {
	XMLName xml.Name `xml:"urn:xmpp:jingle:apps:dtls:0 fingerprint"`
	Hash    string   `xml:"hash,attr"`
	Setup   string   `xml:"setup,attr,omitempty"`
	Text    string   `xml:",chardata"`
}

type ICEOptionTrickle struct {
	XMLName xml.Name `xml:"http://gultsch.de/xmpp/drafts/jingle/transports/ice-udp/option trickle"`
}

type ICEOptionRenomination struct {
	XMLName xml.Name `xml:"http://gultsch.de/xmpp/drafts/jingle/transports/ice-udp/option renomination"`
}

func init() {
	stanza.TypeRegistry.MapExtension(stanza.PKTIQ, xml.Name{
		Space: NSJingle,
		Local: "jingle",
	}, JingleIQ{})
}