Preheat oven to 450 degrees. Season chicken inside and out with salt and pepper and place in a roasting pan. Stuff thyme and parsley in cavity. In a large bowl, toss leeks, carrots, and potatoes with oil; season with salt and pepper. Scatter vegetables around chicken, arranging potatoes at edges of pan; pour wine into pan. Roast until chicken is golden brown and juices run clear when pierced between breast and leg (an instant-read thermometer inserted in thickest part of a thigh, avoiding bone, should read 165 degrees), about 1 hour.