From e2b50d6194ab825de8c6443d46b642ecd3a0313c Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Sat, 27 Oct 2018 22:02:25 +0200
Subject: Add better support for multiperson DM (mattermost)

---
 bridge/mattermost/mattermost.go |  8 ++++----
 matterclient/matterclient.go    | 30 ++++++++++++++++++++++++------
 2 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/bridge/mattermost/mattermost.go b/bridge/mattermost/mattermost.go
index 2fed284e..c9a7c664 100644
--- a/bridge/mattermost/mattermost.go
+++ b/bridge/mattermost/mattermost.go
@@ -109,7 +109,7 @@ func (b *Bmattermost) Disconnect() error {
 func (b *Bmattermost) JoinChannel(channel config.ChannelInfo) error {
 	// we can only join channels using the API
 	if b.GetString("WebhookURL") == "" && b.GetString("WebhookBindAddress") == "" {
-		id := b.mc.GetChannelId(channel.Name, "")
+		id := b.mc.GetChannelId(channel.Name, b.TeamID)
 		if id == "" {
 			return fmt.Errorf("Could not find channel ID for channel %s", channel.Name)
 		}
@@ -147,7 +147,7 @@ func (b *Bmattermost) Send(msg config.Message) (string, error) {
 	// Upload a file if it exists
 	if msg.Extra != nil {
 		for _, rmsg := range helper.HandleExtra(&msg, b.General) {
-			b.mc.PostMessage(b.mc.GetChannelId(rmsg.Channel, ""), rmsg.Username+rmsg.Text)
+			b.mc.PostMessage(b.mc.GetChannelId(rmsg.Channel, b.TeamID), rmsg.Username+rmsg.Text)
 		}
 		if len(msg.Extra["file"]) > 0 {
 			return b.handleUploadFile(&msg)
@@ -165,7 +165,7 @@ func (b *Bmattermost) Send(msg config.Message) (string, error) {
 	}
 
 	// Post normal message
-	return b.mc.PostMessage(b.mc.GetChannelId(msg.Channel, ""), msg.Text)
+	return b.mc.PostMessage(b.mc.GetChannelId(msg.Channel, b.TeamID), msg.Text)
 }
 
 func (b *Bmattermost) handleMatter() {
@@ -357,7 +357,7 @@ func (b *Bmattermost) handleDownloadFile(rmsg *config.Message, id string) error
 func (b *Bmattermost) handleUploadFile(msg *config.Message) (string, error) {
 	var err error
 	var res, id string
-	channelID := b.mc.GetChannelId(msg.Channel, "")
+	channelID := b.mc.GetChannelId(msg.Channel, b.TeamID)
 	for _, f := range msg.Extra["file"] {
 		fi := f.(config.FileInfo)
 		id, err = b.mc.UploadFile(*fi.Data, channelID, fi.Name)
diff --git a/matterclient/matterclient.go b/matterclient/matterclient.go
index 86eb1bea..8b3c07d1 100644
--- a/matterclient/matterclient.go
+++ b/matterclient/matterclient.go
@@ -434,8 +434,9 @@ func (m *MMClient) GetChannelName(channelId string) string {
 			for _, channel := range t.Channels {
 				if channel.Id == channelId {
 					if channel.Type == model.CHANNEL_GROUP {
-						res := strings.Replace(channel.DisplayName, ",", "_", -1)
-						return strings.Replace(res, " ", "", -1)
+						res := strings.Replace(channel.DisplayName, ", ", "-", -1)
+						res = strings.Replace(res, " ", "_", -1)
+						return res
 					}
 					return channel.Name
 				}
@@ -445,8 +446,9 @@ func (m *MMClient) GetChannelName(channelId string) string {
 			for _, channel := range t.MoreChannels {
 				if channel.Id == channelId {
 					if channel.Type == model.CHANNEL_GROUP {
-						res := strings.Replace(channel.DisplayName, ",", "_", -1)
-						return strings.Replace(res, " ", "", -1)
+						res := strings.Replace(channel.DisplayName, ", ", "-", -1)
+						res = strings.Replace(res, " ", "_", -1)
+						return res
 					}
 					return channel.Name
 				}
@@ -460,8 +462,20 @@ func (m *MMClient) GetChannelId(name string, teamId string) string {
 	m.RLock()
 	defer m.RUnlock()
 	if teamId == "" {
-		teamId = m.Team.Id
+		for _, t := range m.OtherTeams {
+			for _, channel := range append(t.Channels, t.MoreChannels...) {
+				if channel.Type == model.CHANNEL_GROUP {
+					res := strings.Replace(channel.DisplayName, ", ", "-", -1)
+					res = strings.Replace(res, " ", "_", -1)
+					if res == name {
+						return channel.Id
+					}
+				}
+
+			}
+		}
 	}
+
 	for _, t := range m.OtherTeams {
 		if t.Id == teamId {
 			for _, channel := range append(t.Channels, t.MoreChannels...) {
@@ -689,7 +703,7 @@ func (m *MMClient) SendDirectMessage(toUserId string, msg string) {
 
 	// build & send the message
 	msg = strings.Replace(msg, "\r", "", -1)
-	post := &model.Post{ChannelId: m.GetChannelId(channelName, ""), Message: msg}
+	post := &model.Post{ChannelId: m.GetChannelId(channelName, m.Team.Id), Message: msg}
 	m.Client.CreatePost(post)
 }
 
@@ -743,9 +757,13 @@ func (m *MMClient) GetTeamFromChannel(channelId string) string {
 		}
 		for _, c := range channels {
 			if c.Id == channelId {
+				if c.Type == model.CHANNEL_GROUP {
+					return "G"
+				}
 				return t.Id
 			}
 		}
+		channels = nil
 	}
 	return ""
 }
-- 
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