update of posotion by trade his

internal/service/portfolio.go

@@ -0,0 +1,51 @@
+package service
+
+import (
+	"Portifolio/internal/database"
+	"Portifolio/internal/model"
+	"database/sql"
+	"fmt"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func UpdatePositionByTradeList(db *sql.DB) error {
+
+	trades, err := database.GetTrades(db)
+	if err != nil {
+		fmt.Printf("Failed to get the trades from db: %s", err)
+	}
+
+	var TradeSum map[string]model.Position
+
+	for _, trade := range trades {
+		if trade.Type == model.Buy {
+			TradeSum[trade.Symbol] = model.Position{
+				Symbol:       trade.Symbol,
+				CurrencyCode: trade.CurrencyCode,
+				CostBasis:    TradeSum[trade.Symbol].CostBasis + trade.Price,
+				Shares:       TradeSum[trade.Symbol].Shares + trade.Shares,
+			}
+		} else {
+			TradeSum[trade.Symbol] = model.Position{
+				Symbol:       trade.Symbol,
+				CurrencyCode: trade.CurrencyCode,
+				CostBasis:    TradeSum[trade.Symbol].CostBasis - trade.Price,
+				Shares:       TradeSum[trade.Symbol].Shares - trade.Shares,
+			}
+		}
+
+	}
+
+	var NewPositinos []model.Position
+	for _, pos := range TradeSum {
+		NewPositinos = append(NewPositinos, pos)
+	}
+
+	err = database.UpdatePositions(db, NewPositinos)
+	if err != nil {
+		return fmt.Errorf("Failed to insert the new postions number into db: %s", err)
+	}
+
+	return nil
+}