feat: add endpoint and logic for retrieving transaction chart data, including SQL queries, models, and service integration

internal/repositories/dashboard_repository.go

@@ -2,6 +2,8 @@ package repositories
 
 import (
 	"context"
+	"sort"
+	"time"
 	"wm-backend/internal/mapper"
 	"wm-backend/internal/models"
 	db "wm-backend/sqlc_gen"
@@ -83,3 +85,43 @@ func GetAnomalyItems(ctx context.Context, queries *db.Queries, warehouseID pgtyp
 	}
 	return items, nil
 }
+
+func GetTransactionChartData(ctx context.Context, queries *db.Queries, startDate, endDate time.Time, warehouseID pgtype.Int8) (models.TransactionChartData, error) {
+	results, err := queries.GetTransactionChartData(ctx, db.GetTransactionChartDataParams{
+		StartDate:   startDate,
+		EndDate:     endDate,
+		WarehouseID: warehouseID,
+	})
+	if err != nil {
+		return models.TransactionChartData{}, err
+	}
+
+	dateMap := make(map[string]*models.TransactionChartItem)
+	for _, r := range results {
+		row := mapper.ToDomainTransactionChartRow(r)
+		dateStr := row.Date.Format("2006-01-02")
+		if _, exists := dateMap[dateStr]; !exists {
+			dateMap[dateStr] = &models.TransactionChartItem{
+				Date:           dateStr,
+				ImportQuantity: 0,
+				ExportQuantity: 0,
+			}
+		}
+		switch row.TransactionType {
+		case "import":
+			dateMap[dateStr].ImportQuantity = row.TotalQuantity
+		case "export":
+			dateMap[dateStr].ExportQuantity = row.TotalQuantity
+		}
+	}
+
+	items := make([]models.TransactionChartItem, 0, len(dateMap))
+	for _, item := range dateMap {
+		items = append(items, *item)
+	}
+	sort.Slice(items, func(i, j int) bool {
+		return items[i].Date < items[j].Date
+	})
+
+	return models.TransactionChartData{Items: items}, nil
+}