Inicial

backend/internal/expense/repository.go

@@ -0,0 +1,69 @@
+package expense
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type Expense struct {
+	ID          string    `json:"id"`
+	VehicleID   *string   `json:"vehicle_id"`
+	Type        string    `json:"type"`
+	Amount      float64   `json:"amount"`
+	Description string    `json:"description"`
+	Date        time.Time `json:"date"`
+	CreatedAt   time.Time `json:"created_at"`
+}
+
+func ListExpenses(ctx context.Context, conn *pgxpool.Conn, typeFilter string) ([]*Expense, error) {
+	q := `SELECT id, vehicle_id, type, amount, COALESCE(description,''), date, created_at
+	      FROM expenses`
+	args := []any{}
+	if typeFilter != "" {
+		q += " WHERE type = $1"
+		args = append(args, typeFilter)
+	}
+	q += " ORDER BY date DESC, created_at DESC"
+	rows, err := conn.Query(ctx, q, args...)
+	if err != nil {
+		return nil, fmt.Errorf("expense: list: %w", err)
+	}
+	defer rows.Close()
+	var list []*Expense
+	for rows.Next() {
+		var e Expense
+		if err := rows.Scan(&e.ID, &e.VehicleID, &e.Type, &e.Amount, &e.Description, &e.Date, &e.CreatedAt); err != nil {
+			return nil, fmt.Errorf("expense: scan: %w", err)
+		}
+		list = append(list, &e)
+	}
+	return list, rows.Err()
+}
+
+func CreateExpense(ctx context.Context, conn *pgxpool.Conn, vehicleID *string, expType, description string, amount float64, date time.Time) (*Expense, error) {
+	row := conn.QueryRow(ctx,
+		`INSERT INTO expenses (vehicle_id, type, amount, description, date)
+		 VALUES ($1, $2, $3, NULLIF($4,''), $5)
+		 RETURNING id, vehicle_id, type, amount, COALESCE(description,''), date, created_at`,
+		vehicleID, expType, amount, description, date)
+	var e Expense
+	if err := row.Scan(&e.ID, &e.VehicleID, &e.Type, &e.Amount, &e.Description, &e.Date, &e.CreatedAt); err != nil {
+		return nil, fmt.Errorf("expense: create: %w", err)
+	}
+	return &e, nil
+}
+
+func DeleteExpense(ctx context.Context, conn *pgxpool.Conn, id string) error {
+	tag, err := conn.Exec(ctx, `DELETE FROM expenses WHERE id = $1`, id)
+	if err != nil {
+		return fmt.Errorf("expense: delete: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return pgx.ErrNoRows
+	}
+	return nil
+}