  A liquid Argon TPC (ICARUS-like) has the ability to detect clean neutrino
bursts from type-II supernova collapses. In this paper, we consider for the
first time the four possible detectable channels, namely, the elastic
scattering on electrons from all neutrino species, $\nu_e$ charged current
absorption on $Ar$ with production of excited $K$, $\bar\nu_e$ charged current
absorption on $Ar$ with production of excited $Cl$ and neutral current
interactions on $Ar$ from all neutrino flavors. We compute the total rates and
energy spectra of supernova neutrino events including the effects of the
three--flavor neutrino oscillation with matter effects in the propagation in
the supernova. Results show a dramatic dependence on the oscillation parameters
and in the energy spectrum, especially for charged-current events. The shock
breakout phase has also been investigated using recent simulations of the core
collapse supernova. We stress the importance of the neutral current signal to
decouple supernova from neutrino oscillation physics.
