function [esti_ang_deg, P_FT, fft_ang_deg] = df_FFT(snapshot, NFFT, fft_ang, array_struct, Ntarget, plot_flag)

%% FFT algorithm
Nsnap = size(snapshot, 2);

if isempty(fft_ang)
    fft_freq = -180 : 360/NFFT : (180 - 360/NFFT);
    fft_ang_deg = asind(fft_freq / 2 * array_struct.lambda_c / array_struct.unit / 180);
end

% FFT spectrum
zero_padded_input = complex(zeros(NFFT, Nsnap));
zero_padded_input(array_struct.eff_ch_loc+1, :) = snapshot;

if Nsnap == 1
    P_FT = abs(flipud(fftshift((1/Nsnap) * ((fft(zero_padded_input, NFFT)))').')).^2;
else
    P_FT = abs(flipud(fftshift((1/Nsnap) * (sum(fft(zero_padded_input, NFFT),2))').')).^2;
end

% Plot
if plot_flag == 1
    figure()
    plot(fft_ang_deg, pow2db(abs(P_FT)));
    grid on
    xlabel('Angle [deg]')
    ylabel('Magnitude [dB]')
end

[pks, pks_ang, ~, ~] = findpeaks(pow2db(abs(P_FT)), fft_ang_deg);
[~, order] = sort(pks, 'descend');
if isempty(pks)
    esti_ang_deg = nan;
else
    esti_ang_deg = pks_ang(order(1:Ntarget));
end
    

end