From e030c9548cfcee25686917a68c506afb9d237689 Mon Sep 17 00:00:00 2001
From: Skip R <tinyslices@gmail.com>
Date: Wed, 17 Dec 2025 18:44:52 -0800
Subject: [PATCH] handlematrix: bridge outgoing reactions

---
 pkg/connector/capabilities.go |  5 +++--
 pkg/connector/handlematrix.go | 34 +++++++++++++++++++++++++---------
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/pkg/connector/capabilities.go b/pkg/connector/capabilities.go
index b9c891f..aff026e 100644
--- a/pkg/connector/capabilities.go
+++ b/pkg/connector/capabilities.go
@@ -55,8 +55,9 @@ func capID() string {
 }
 
 var discordCaps = &event.RoomFeatures{
-	ID:    capID(),
-	Reply: event.CapLevelFullySupported,
+	ID:       capID(),
+	Reply:    event.CapLevelFullySupported,
+	Reaction: event.CapLevelFullySupported,
 	Formatting: event.FormattingFeatureMap{
 		event.FmtBold:               event.CapLevelFullySupported,
 		event.FmtItalic:             event.CapLevelFullySupported,
diff --git a/pkg/connector/handlematrix.go b/pkg/connector/handlematrix.go
index ab6d89f..c33017a 100644
--- a/pkg/connector/handlematrix.go
+++ b/pkg/connector/handlematrix.go
@@ -73,19 +73,35 @@ func (d *DiscordClient) HandleMatrixEdit(ctx context.Context, msg *bridgev2.Matr
 	panic("implement me")
 }
 
-func (d *DiscordClient) PreHandleMatrixReaction(ctx context.Context, msg *bridgev2.MatrixReaction) (bridgev2.MatrixReactionPreResponse, error) {
-	//TODO implement me
-	panic("implement me")
+func (d *DiscordClient) PreHandleMatrixReaction(ctx context.Context, reaction *bridgev2.MatrixReaction) (bridgev2.MatrixReactionPreResponse, error) {
+	key := reaction.Content.RelatesTo.Key
+	// TODO: Handle custom emoji.
+
+	return bridgev2.MatrixReactionPreResponse{
+		SenderID: networkid.UserID(d.UserLogin.ID),
+		EmojiID:  networkid.EmojiID(key),
+	}, nil
 }
 
-func (d *DiscordClient) HandleMatrixReaction(ctx context.Context, msg *bridgev2.MatrixReaction) (reaction *database.Reaction, err error) {
-	//TODO implement me
-	panic("implement me")
+func (d *DiscordClient) HandleMatrixReaction(ctx context.Context, reaction *bridgev2.MatrixReaction) (*database.Reaction, error) {
+	key := reaction.Content.RelatesTo.Key
+	portal := reaction.Portal
+	// TODO: Support guilds.
+	guildID := ""
+
+	err := d.Session.MessageReactionAddUser(guildID, string(portal.ID), string(reaction.TargetMessage.ID), key)
+	return nil, err
 }
 
-func (d *DiscordClient) HandleMatrixReactionRemove(ctx context.Context, msg *bridgev2.MatrixReactionRemove) error {
-	//TODO implement me
-	panic("implement me")
+func (d *DiscordClient) HandleMatrixReactionRemove(ctx context.Context, removal *bridgev2.MatrixReactionRemove) error {
+	removing := removal.TargetReaction
+	emojiID := removing.EmojiID
+	channelID := string(removing.Room.ID)
+	// TODO: Support guilds.
+	guildID := ""
+
+	err := d.Session.MessageReactionRemoveUser(guildID, channelID, string(removing.MessageID), string(emojiID), string(d.UserLogin.ID))
+	return err
 }
 
 func (d *DiscordClient) HandleMatrixMessageRemove(ctx context.Context, msg *bridgev2.MatrixMessageRemove) error {