add trade and position service

internal/database/portfolio.go

@@ -43,9 +43,9 @@ func GetTrades(db *sql.DB) ([]model.Trade, error) {
 }
 
 func GetPositions(db *sql.DB) ([]model.Position, error) {
-	rows, err := db.Query("SELECT company_id, symbol, shares, weight, CostBasis, currency_id, currency_code from position")
+	rows, err := db.Query("SELECT company_id, symbol, shares, weight, cost_basis, currency_id, currency_code from position")
 	if err != nil {
-		return nil, err
+		return []model.Position{}, err
 	}
 	defer rows.Close()
 
@@ -55,13 +55,13 @@ func GetPositions(db *sql.DB) ([]model.Position, error) {
 
 		err := rows.Scan(&t.CompanyID, &t.Symbol, &t.Shares, &t.Weight, &t.CostBasis, &t.CurrencyID, &t.CurrencyCode)
 		if err != nil {
-			return nil, err
+			return []model.Position{}, err
 		}
 
 		positions = append(positions, t)
 	}
 	if err = rows.Err(); err != nil {
-		return nil, err
+		return []model.Position{}, err
 	}
 
 	return positions, nil

internal/handlers/portfolio.go

@@ -81,15 +81,15 @@ func GetTradeListHandler(db *sql.DB) http.HandlerFunc {
 
 func GetPositionListHandler(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		tradeList, err := database.GetPositions(db)
+		posList, err := database.GetPositions(db)
 		if err != nil {
-			http.Error(w, "failed to fetch trades", http.StatusInternalServerError)
+			http.Error(w, fmt.Sprintf("failed to fetch postiton: %s", err), http.StatusInternalServerError)
 			return
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		if err := json.NewEncoder(w).Encode(tradeList); err != nil {
-			http.Error(w, "failed to encode trades", http.StatusInternalServerError)
+		if err := json.NewEncoder(w).Encode(map[string]any{"List": posList}); err != nil {
+			http.Error(w, fmt.Sprintf("failed to encode positions: %s", err), http.StatusInternalServerError)
 			return
 		}
 	}

internal/model/portifolio.go

@@ -54,7 +54,7 @@ type Trade struct {
 
 func (r *AddTradeRequest) Validate() error {
 	if r.Symbol == "" {
-		return errors.New("empty SYmbol string")
+		return errors.New("empty Symbol string")
 	}
 	if r.Shares <= 0 {
 		return errors.New("shares must be a positive integer")

internal/service/portfolio.go

@@ -16,7 +16,7 @@ func UpdatePositionByTradeList(db *sql.DB) error {
 		fmt.Printf("Failed to get the trades from db: %s", err)
 	}
 
-	var TradeSum map[string]model.Position
+	TradeSum := make(map[string]model.Position)
 
 	for _, trade := range trades {
 		if trade.Type == model.Buy {