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import ( "fmt" "log" "strings" "time"
"tangled.org/core/appview/models")
func AddFollow(e Execer, follow *models.Follow) error { query := `insert or ignore into follows (user_did, subject_did, rkey) values (?, ?, ?)` _, err := e.Exec(query, follow.UserDid, follow.SubjectDid, follow.Rkey) return err}
// Get a follow recordfunc GetFollow(e Execer, userDid, subjectDid string) (*models.Follow, error) { query := `select user_did, subject_did, followed_at, rkey from follows where user_did = ? and subject_did = ?` row := e.QueryRow(query, userDid, subjectDid)
var follow models.Follow var followedAt string err := row.Scan(&follow.UserDid, &follow.SubjectDid, &followedAt, &follow.Rkey) if err != nil { return nil, err }
followedAtTime, err := time.Parse(time.RFC3339, followedAt) if err != nil { log.Println("unable to determine followed at time") follow.FollowedAt = time.Now() } else { follow.FollowedAt = followedAtTime }
return &follow, nil}
// Remove a followfunc DeleteFollow(e Execer, userDid, subjectDid string) error { _, err := e.Exec(`delete from follows where user_did = ? and subject_did = ?`, userDid, subjectDid) return err}
// Remove a followfunc DeleteFollowByRkey(e Execer, userDid, rkey string) error { _, err := e.Exec(`delete from follows where user_did = ? and rkey = ?`, userDid, rkey) return err}
func GetFollowerFollowingCount(e Execer, did string) (models.FollowStats, error) { var followers, following int64 err := e.QueryRow( `SELECT COUNT(CASE WHEN subject_did = ? THEN 1 END) AS followers, COUNT(CASE WHEN user_did = ? THEN 1 END) AS following FROM follows;`, did, did).Scan(&followers, &following) if err != nil { return models.FollowStats{}, err } return models.FollowStats{ Followers: followers, Following: following, }, nil}
func GetFollowerFollowingCounts(e Execer, dids []string) (map[string]models.FollowStats, error) { if len(dids) == 0 { return nil, nil }
placeholders := make([]string, len(dids)) for i := range placeholders { placeholders[i] = "?" } placeholderStr := strings.Join(placeholders, ",")
args := make([]any, len(dids)*2) for i, did := range dids { args[i] = did args[i+len(dids)] = did }
query := fmt.Sprintf(` select coalesce(f.did, g.did) as did, coalesce(f.followers, 0) as followers, coalesce(g.following, 0) as following from ( select subject_did as did, count(*) as followers from follows where subject_did in (%s) group by subject_did ) f full outer join ( select user_did as did, count(*) as following from follows where user_did in (%s) group by user_did ) g on f.did = g.did`, placeholderStr, placeholderStr)
result := make(map[string]models.FollowStats)
rows, err := e.Query(query, args...) if err != nil { return nil, err } defer rows.Close()
for rows.Next() { var did string var followers, following int64 if err := rows.Scan(&did, &followers, &following); err != nil { return nil, err } result[did] = models.FollowStats{ Followers: followers, Following: following, } }
for _, did := range dids { if _, exists := result[did]; !exists { result[did] = models.FollowStats{ Followers: 0, Following: 0, } } }
return result, nil}
func GetFollows(e Execer, limit int, filters ...filter) ([]models.Follow, error) { var follows []models.Follow
var conditions []string var args []any for _, filter := range filters { conditions = append(conditions, filter.Condition()) args = append(args, filter.Arg()...) }
whereClause := "" if conditions != nil { whereClause = " where " + strings.Join(conditions, " and ") } limitClause := "" if limit > 0 { limitClause = " limit ?" args = append(args, limit) }
query := fmt.Sprintf( `select user_did, subject_did, followed_at, rkey from follows %s order by followed_at desc %s `, whereClause, limitClause)
rows, err := e.Query(query, args...) if err != nil { return nil, err } for rows.Next() { var follow models.Follow var followedAt string err := rows.Scan( &follow.UserDid, &follow.SubjectDid, &followedAt, &follow.Rkey, ) if err != nil { return nil, err } followedAtTime, err := time.Parse(time.RFC3339, followedAt) if err != nil { log.Println("unable to determine followed at time") follow.FollowedAt = time.Now() } else { follow.FollowedAt = followedAtTime } follows = append(follows, follow) } return follows, nil}
func GetFollowers(e Execer, did string) ([]models.Follow, error) { return GetFollows(e, 0, FilterEq("subject_did", did))}
func GetFollowing(e Execer, did string) ([]models.Follow, error) { return GetFollows(e, 0, FilterEq("user_did", did))}
func getFollowStatuses(e Execer, userDid string, subjectDids []string) (map[string]models.FollowStatus, error) { if len(subjectDids) == 0 || userDid == "" { return make(map[string]models.FollowStatus), nil }
result := make(map[string]models.FollowStatus)
for _, subjectDid := range subjectDids { if userDid == subjectDid { result[subjectDid] = models.IsSelf } else { result[subjectDid] = models.IsNotFollowing } }
var querySubjects []string for _, subjectDid := range subjectDids { if userDid != subjectDid { querySubjects = append(querySubjects, subjectDid) } }
if len(querySubjects) == 0 { return result, nil }
placeholders := make([]string, len(querySubjects)) args := make([]any, len(querySubjects)+1) args[0] = userDid
for i, subjectDid := range querySubjects { placeholders[i] = "?" args[i+1] = subjectDid }
query := fmt.Sprintf(` SELECT subject_did FROM follows WHERE user_did = ? AND subject_did IN (%s) `, strings.Join(placeholders, ","))
rows, err := e.Query(query, args...) if err != nil { return nil, err } defer rows.Close()
for rows.Next() { var subjectDid string if err := rows.Scan(&subjectDid); err != nil { return nil, err } result[subjectDid] = models.IsFollowing }
return result, nil}
func GetFollowStatus(e Execer, userDid, subjectDid string) models.FollowStatus { statuses, err := getFollowStatuses(e, userDid, []string{subjectDid}) if err != nil { return models.IsNotFollowing } return statuses[subjectDid]}
func GetFollowStatuses(e Execer, userDid string, subjectDids []string) (map[string]models.FollowStatus, error) { return getFollowStatuses(e, userDid, subjectDids)}