mid chat group ccreation implementation

database.go

@@ -27,8 +27,8 @@ func InitDatabase(ctx context.Context) {
 		CREATE TABLE IF NOT EXISTS chat_groups (
 		    id SERIAL PRIMARY KEY,
 		    name VARCHAR(48) NOT NULL,
-		    createor INTEGER NOT NULL REFERANCE users(id) ON DELETE SET NULL,
-		    owner INTEGER NOT NULL REFERANCE user(id) ON DELETE SET NULL
+		    creator_id INTEGER NOT NULL REFERENCES users(id) ON DELETE SET NULL,
+		    owner_id INTEGER NOT NULL REFERENCES users(id) ON DELETE SET NULL,
 		    enable_user_colors BOOLEAN NOT NULL DEFAULT true,
 		    group_color VARCHAR(3),
 		    created_at TIMESTAMP NOT NULL DEFAULT NOW()
@@ -46,7 +46,7 @@ func InitDatabase(ctx context.Context) {
 	dbConnection = conn
 }
 
-func AddNewUser(ctx context.Context, user User) (uint32, error) {
+func AddNewUser(ctx context.Context, user *User) (uint32, error) {
 	var id uint32
 	var err error
 
@@ -107,6 +107,48 @@ func GetUserDataByName(ctx context.Context, name string) (*User, error) {
 	return &user, nil
 }
 
-func CreateGroup() {
+func CreateChatGroupWithoutMembers(ctx context.Context, group *ChatGroup) (uint32, error) {
 
+	if len(group.Name) < 1 {
+		return 0, errors.New("group name too short")
+	}
+	if len(group.Name) > 48 {
+		return 0, errors.New("group name too long")
+	}
+
+	var id uint32
+	err := dbConnection.QueryRow(ctx, `INSERT INTO chat_groups (name, creator_id, owner_id, created_at )
+			VALUES ($1, $2, $3, $4)
+			RETURNING id
+		`, group.Name, group.CreatorId, group.OwnerId, group.CreatedAt).Scan(&id)
+	return id, err
+}
+
+func GetChatGroupWithoutMembers(ctx context.Context, id uint32) (ChatGroup, error) {
+	var group ChatGroup
+	err := dbConnection.QueryRow(ctx, `SELECT name, creator_id, owner_id, enable_user_colors, group_color, created_at FROM chat_groups WHERE id = $1`,
+		id).Scan(&group.Name, &group.CreatorId, &group.OwnerId, &group.EnableUserColors, &group.Color, &group.CreatedAt)
+	return group, err
+}
+
+func GetChatGroupMembers(ctx context.Context, groupId uint32) ([]User, error) {
+	rows, err := dbConnection.Query(ctx, `
+		SELECT usr.id, usr.name, usr.color FROM users usr
+		JOIN chat_group_members members ON usr.id = members.user_id
+		WHERE members.group_id = $1
+	`, groupId)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var members []User
+	for rows.Next() {
+		var user User
+		if err := rows.Scan(&user.Id, &user.Name, &user.Color); err != nil {
+			return nil, err
+		}
+		members = append(members, user)
+	}
+	return members, rows.Err()
 }