{{ define "updates_classifier" }}
{{ $pkg := $.Package }}
{{ template "header" $ }}

func IsPtsUpdate(u UpdateClass) (pts, ptsCount int, ok bool) {
	switch u := u.(type) {
{{- range $s := $.Structs }}{{ if and (eq $s.Interface "UpdateClass") 
		  							  (hasField $s.Fields "Pts" "int") 
									  (not (contains $s.Name "Channel")) }}
{{- $ptsCount := or (and (hasField $s.Fields "PtsCount" "int") "u.PtsCount") "0" }}
	case *{{ $s.Name }}:
		return u.Pts, {{ $ptsCount }}, true
{{- end }}{{ end }}
	}

	return
}

func IsQtsUpdate(u UpdateClass) (qts int, ok bool) {
	switch u := u.(type) {
{{- range $s := $.Structs }}{{ if and (eq $s.Interface "UpdateClass") (hasField $s.Fields "Qts" "int") }}
	case *{{ $s.Name }}:
		return u.Qts, true
{{- end }}{{ end }}
	}

	return
}

func IsChannelPtsUpdate(u UpdateClass) (channelID int64, pts, ptsCount int, ok bool, err error) {
	switch u := u.(type) {
{{- range $s := $.Structs }}{{ if and (eq $s.Interface "UpdateClass") 
		  							  (hasField $s.Fields "Pts" "int") 
									  (contains $s.Name "Channel") }}
{{- $ptsCount := or (and (hasField $s.Fields "PtsCount" "int") "u.PtsCount") "0" }}
	case *{{ $s.Name }}:
{{- if (hasField $s.Fields "ChannelID" "int64") }}
		return u.ChannelID, u.Pts, {{ $ptsCount }}, true, nil
{{- else }}
		channelID, err = extractChannelID(u.Message)
		return channelID, u.Pts, {{ $ptsCount }}, true, err
{{- end }}{{ end }}{{ end }}
	}

	return
}

func extractChannelID(msg MessageClass) (int64, error) {
	switch msg := msg.(type) {
{{- range $s := $.Structs }}{{ if eq $s.Interface "MessageClass" }}
	case *{{ $s.Name }}:
{{- range $field := $s.Fields }}{{ if eq $field.Name "PeerID" }}
{{- if (optionalField $s $field) }}
		peer, ok := msg.GetPeerID()
		if !ok {
			return 0, errors.New("{{ $s.Name }} have no peerID field")
		}
{{- else }}
		peer := msg.PeerID
{{ end }}{{ end }}{{ end }}
		if c, ok := peer.(*PeerChannel); ok {
			return c.ChannelID, nil
		}

		return 0, errors.New("unexpected peer type")
{{- end }}{{ end }}
	default:
		return 0, errors.New("unexpected MessageClass type")
	}
}

{{ end }}