Implement cleaning to set all historic negative balances to zero

http/admin.go

@@ -3,7 +3,9 @@ package http
 import (
 	"fmt"
 	"net/http"
+	"time"
 
+	"git.javil.eu/jacob1123/budgeteer/postgres"
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
 	"github.com/pressly/goose/v3"
@@ -56,3 +58,50 @@ func (h *Handler) clearBudget(c *gin.Context) {
 
 	fmt.Printf("Deleted %d transactions\n", rows)
 }
+
+func (h *Handler) cleanNegativeBudget(c *gin.Context) {
+	budgetID := c.Param("budgetid")
+	budgetUUID, err := uuid.Parse(budgetID)
+	if err != nil {
+		c.Redirect(http.StatusTemporaryRedirect, "/login")
+		return
+	}
+
+	min_date, err := h.Service.DB.GetFirstActivity(c.Request.Context(), budgetUUID)
+	date := getFirstOfMonthTime(min_date)
+	for {
+		nextDate := date.AddDate(0, 1, 0)
+		params := postgres.GetCategoriesWithBalanceParams{
+			BudgetID: budgetUUID,
+			ToDate:   nextDate,
+			FromDate: date,
+		}
+		categories, err := h.Service.DB.GetCategoriesWithBalance(c.Request.Context(), params)
+		if err != nil {
+			c.AbortWithError(http.StatusInternalServerError, err)
+			return
+		}
+
+		for _, category := range categories {
+			available := category.Available.GetFloat64()
+			if available >= 0 {
+				continue
+			}
+			var negativeAvailable postgres.Numeric
+			negativeAvailable.Set(-available)
+			createAssignment := postgres.CreateAssignmentParams{
+				Date:       nextDate.AddDate(0, 0, -1),
+				Amount:     negativeAvailable,
+				CategoryID: category.ID,
+			}
+			h.Service.DB.CreateAssignment(c.Request.Context(), createAssignment)
+		}
+
+		if nextDate.Before(time.Now()) {
+			date = nextDate
+		} else {
+			break
+		}
+	}
+
+}