big update: added reactions, groups, media share

server/internal/store/reactions.go

@@ -0,0 +1,71 @@
+package store
+
+import (
+	"context"
+)
+
+// Reaction represents a single emoji reaction on a message.
+type Reaction struct {
+	MessageID int64
+	UserID    int64
+	Emoji     string
+}
+
+// AddReaction adds a reaction to a message; it is a no-op if it already exists.
+func (s *Store) AddReaction(ctx context.Context, messageID, userID int64, emoji string) error {
+	_, err := s.pool.Exec(ctx, `
+       INSERT INTO message_reactions(message_id, user_id, emoji)
+       VALUES($1, $2, $3)
+       ON CONFLICT (message_id, user_id, emoji) DO NOTHING
+   `, messageID, userID, emoji)
+	return err
+}
+
+// RemoveReaction removes a reaction from a message; it is a no-op if absent.
+func (s *Store) RemoveReaction(ctx context.Context, messageID, userID int64, emoji string) error {
+	_, err := s.pool.Exec(ctx, `
+       DELETE FROM message_reactions WHERE message_id=$1 AND user_id=$2 AND emoji=$3
+   `, messageID, userID, emoji)
+	return err
+}
+
+// ReactionsForMessages returns all reactions for the given message IDs.
+func (s *Store) ReactionsForMessages(ctx context.Context, messageIDs []int64) ([]Reaction, error) {
+	if len(messageIDs) == 0 {
+		return nil, nil
+	}
+	rows, err := s.pool.Query(ctx, `
+       SELECT message_id, user_id, emoji
+       FROM message_reactions
+       WHERE message_id = ANY($1)
+       ORDER BY message_id, created_at
+   `, messageIDs)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var reactions []Reaction
+	for rows.Next() {
+		var r Reaction
+		if err := rows.Scan(&r.MessageID, &r.UserID, &r.Emoji); err != nil {
+			return nil, err
+		}
+		reactions = append(reactions, r)
+	}
+	return reactions, nil
+}
+
+// MessageBelongsToConversation reports whether a message belongs to a conversation.
+func (s *Store) MessageBelongsToConversation(ctx context.Context, conversationID, messageID int64) (bool, error) {
+	var exists bool
+	err := s.pool.QueryRow(ctx, `
+       SELECT EXISTS(
+           SELECT 1 FROM messages WHERE id=$1 AND conversation_id=$2
+       )
+   `, messageID, conversationID).Scan(&exists)
+	if err != nil {
+		return false, err
+	}
+	return exists, nil
+}