Try to display simple budget screen

postgres/categories.sql.go

@@ -5,6 +5,7 @@ package postgres
 
 import (
 	"context"
+	"time"
 
 	"github.com/google/uuid"
 )
@@ -88,6 +89,59 @@ func (q *Queries) GetCategories(ctx context.Context, budgetID uuid.UUID) ([]GetC
 	return items, nil
 }
 
+const getCategoriesWithBalance = `-- name: GetCategoriesWithBalance :many
+SELECT categories.id, categories.name, category_groups.name as group, SUM(t_hist.amount)::decimal(12,2) as balance, SUM(t_this.amount)::decimal(12,2) as activity
+FROM categories
+INNER JOIN category_groups ON categories.category_group_id = category_groups.id
+INNER JOIN transactions t_hist ON categories.id = t_hist.category_id AND t_hist.date < $1
+INNER JOIN transactions t_this ON categories.id = t_this.category_id AND t_this.date >= $1 AND t_this.date < $2
+WHERE category_groups.budget_id = $3
+GROUP BY categories.id, categories.name, category_groups.name
+`
+
+type GetCategoriesWithBalanceParams struct {
+	FromDate time.Time
+	ToDate   time.Time
+	BudgetID uuid.UUID
+}
+
+type GetCategoriesWithBalanceRow struct {
+	ID       uuid.UUID
+	Name     string
+	Group    string
+	Balance  Numeric
+	Activity Numeric
+}
+
+func (q *Queries) GetCategoriesWithBalance(ctx context.Context, arg GetCategoriesWithBalanceParams) ([]GetCategoriesWithBalanceRow, error) {
+	rows, err := q.db.QueryContext(ctx, getCategoriesWithBalance, arg.FromDate, arg.ToDate, arg.BudgetID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetCategoriesWithBalanceRow
+	for rows.Next() {
+		var i GetCategoriesWithBalanceRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.Name,
+			&i.Group,
+			&i.Balance,
+			&i.Activity,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const getCategoryGroups = `-- name: GetCategoryGroups :many
 SELECT category_groups.id, category_groups.budget_id, category_groups.name FROM category_groups 
 WHERE category_groups.budget_id = $1