Add onion and garlic, and cook for 4 minutes. Add thyme, salt, pepper, and red-pepper flakes, and cook for 1 minute. Add wine, and simmer for 1 minute. Stir in tomatoes, juices, and water. Cover, and simmer for 25 minutes. Add seafood, cover, and cook until shells open, 6 to 8 minutes. (Discard unopened shells and thyme sprigs.) Garnish with parsley, and serve immediately.