feat(social): add listening activity, shared rooms and modern chat

services/api/internal/wave/friends.go

@@ -0,0 +1,48 @@
+package wave
+
+import (
+	"context"
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+)
+
+// Only currently visible activity is a social signal. A hidden profile never contributes
+// its listening history, and self feedback/recent plays retain precedence.
+func (h *Handler) friendCandidates(ctx context.Context, user uuid.UUID, exclude []string) ([]string, error) {
+	rows, e := h.pool.Query(ctx, `SELECT a.track_id::text FROM listening_activity a
+ JOIN users friend ON friend.id=a.user_id AND NOT friend.is_blocked AND friend.activity_visibility IN ('friends','everyone')
+ JOIN users own ON own.id=$1 AND own.friends_recommendations
+ JOIN friendships f ON f.low_id=LEAST($1::uuid,a.user_id) AND f.high_id=GREATEST($1::uuid,a.user_id) AND f.accepted
+ JOIN tracks t ON t.id=a.track_id JOIN media_files mf ON mf.id=t.primary_file_id AND mf.missing_since IS NULL
+ JOIN library_sources src ON src.id=mf.source_id AND src.status='mounted'
+ WHERE a.updated_at>now()-interval '90 seconds' AND NOT(a.track_id::text=ANY($2::text[]))
+ AND NOT EXISTS(SELECT 1 FROM social_blocks b WHERE (b.user_id=$1 AND b.peer_id=a.user_id) OR (b.user_id=a.user_id AND b.peer_id=$1))
+ AND NOT EXISTS(SELECT 1 FROM track_reactions r WHERE r.user_id=$1 AND r.track_id=a.track_id AND r.reaction='dislike')
+ AND NOT EXISTS(SELECT 1 FROM play_events e WHERE e.user_id=$1 AND e.track_id=a.track_id AND e.type='play_start' AND e.occurred_at>now()-interval '3 hours')
+ GROUP BY a.track_id ORDER BY count(DISTINCT a.user_id) DESC,max(a.updated_at) DESC LIMIT 30`, user, exclude)
+	if e != nil {
+		return nil, e
+	}
+	defer rows.Close()
+	return pgx.CollectRows(rows, pgx.RowTo[string])
+}
+func blendFriendPick(picks []Pick, ids []string) []Pick {
+	if len(ids) == 0 || len(picks) < 3 {
+		return picks
+	}
+	for _, id := range ids {
+		exists := false
+		for _, p := range picks {
+			if p.ID == id {
+				exists = true
+				break
+			}
+		}
+		if !exists {
+			out := append([]Pick(nil), picks...)
+			out[len(out)-1] = Pick{ID: id, Source: "friends", Score: 0.1}
+			return out
+		}
+	}
+	return picks
+}