#======================================================================

#                    T I M E _ S E R I E S . P L 

#                    doc: Sun May 23 16:40:53 2010

#                    dlm: Wed Oct 12 12:36:46 2011

#                    (c) 2010 A.M. Thurnherr

#                    uE-Info: 102 23 NIL 0 0 72 2 2 4 NIL ofnI

#======================================================================

# HISTORY:

#	May 23, 2010: - created from [perl-tools/RDI_Utils.pl]

#	Oct 20, 2010: - disabled max_gap profile-restarting code

#	Dec 17, 2010: - re-added {DEPTH} field to ensembles

#	Dec 18, 2010: - max gap re-enabled

#	Dec 20, 2010: - cosmetics

#	Jul  2, 2011: - tightened gap-detection code

#	Jul  4, 2011: - added support for $skip_ens

#	Oct 11, 2011: - BUG: {DEPTH} had not been set at start of profile

#	Oct 12, 2011: - re-worked ref_lr_w()

#				  - stopped depth integration across gaps >= 5s

# NOTES:

#	- resulting DEPTH field based on integrated w without any sound speed correction

#	- single-ping ensembles assumed, i.e. no percent-good tests applied

#	- specified bin numbers are 1-relative

sub ref_lr_w($$$$)										# calc ref-layer vert vels

{

	my($dta,$ens,$rl_b0,$rl_b1) = @_;

	my(@w);

	for (my($bin)=$rl_b0-1; $bin<=$rl_b1-1; $bin++) {

		push(@w,$dta->{ENSEMBLE}[$ens]->{W}[$bin])

			if defined($dta->{ENSEMBLE}[$ens]->{W}[$bin]);

	}

	return unless (@w);

	$dta->{ENSEMBLE}[$ens]->{REFLR_W} = avg(@w);

	$dta->{ENSEMBLE}[$ens]->{REFLR_W_STDDEV} = stddev2($dta->{ENSEMBLE}[$ens]->{REFLR_W},@w);

	$dta->{ENSEMBLE}[$ens]->{REFLR_W_NSAMP} = @w;

}

#======================================================================

# ($firstgood,$lastgood,$atbottom,$w_gap_time) =

#	calcLADCPts($dta,$skip_ens,$lr_b0,$lr_b1,$min_corr,$max_e,$max_gap);

#======================================================================

sub calcLADCPts($$$$)

{

	my($dta,$skip_ens,$rl_b0,$rl_b1,$max_gap) = @_;

	my($firstgood,$lastgood,$atbottom,$w_gap_time,$max_depth);

	for (my($depth)=0,my($e)=$skip_ens; $e<=$#{$dta->{ENSEMBLE}}; $e++) {

		ref_lr_w($dta,$e,$rl_b0,$rl_b1);

		if (defined($firstgood)) {

			$dta->{ENSEMBLE}[$e]->{ELAPSED} =				# time since start

				$dta->{ENSEMBLE}[$e]->{UNIX_TIME} -

				$dta->{ENSEMBLE}[$firstgood]->{UNIX_TIME};

		} else {

			if (defined($dta->{ENSEMBLE}[$e]->{REFLR_W})) {		# start of prof.

				$firstgood = $lastgood = $e;		    

				$dta->{ENSEMBLE}[$e]->{ELAPSED} = 0;

				$dta->{ENSEMBLE}[$e]->{DEPTH} = $depth;

			}

			next;

		}

		unless (defined($dta->{ENSEMBLE}[$e]->{REFLR_W})) {				# gap

			$w_gap_time += $dta->{ENSEMBLE}[$e]->{UNIX_TIME} -

						   $dta->{ENSEMBLE}[$e-1]->{UNIX_TIME};

			next;

		}

		my($dt) = $dta->{ENSEMBLE}[$e]->{UNIX_TIME} -		# time step since

				  $dta->{ENSEMBLE}[$lastgood]->{UNIX_TIME}; # ... last good ens

		if ($dt > $max_gap) {

			if ($max_depth>50 && $depth<0.1*$max_depth) {

				warning(1,"long gap (%ds) near end of profile --- terminated at ensemble #$dta->{ENSEMBLE}[$e]->{NUMBER}\n",$dt);

				last;				

            }

            if ($depth < 10) {

				warning(1,"long gap (%ds) near beginning of profile --- restarted at ensemble #$dta->{ENSEMBLE}[$e]->{NUMBER}\n",$dt);

				$firstgood = $lastgood = $e;

				undef($atbottom); undef($max_depth);

				$depth = 0;

				$dta->{ENSEMBLE}[$e]->{ELAPSED} = 0;

				$dta->{ENSEMBLE}[$e]->{DEPTH} = $depth;

				$w_gap_time = 0;

				next;

			}

			if ($dta->{ENSEMBLE}[$e]->{ELAPSED} < 200) {

				warning(1,"long gap (%ds) at ensemble #$dta->{ENSEMBLE}[$e]->{NUMBER}, %ds into the profile\n",

					$dt,$dta->{ENSEMBLE}[$e]->{ELAPSED});

			} else {

				warning(1,"long gap (%ds) at ensemble #$dta->{ENSEMBLE}[$e]->{NUMBER}, %.1fmin into the profile\n",

					$dt,$dta->{ENSEMBLE}[$e]->{ELAPSED}/60);

			}

		}

		$depth += $dta->{ENSEMBLE}[$lastgood]->{REFLR_W} * $dt			# integrate

			if ($dt < 5);

		$dta->{ENSEMBLE}[$e]->{DEPTH} = $depth;

		$atbottom = $e, $max_depth = $depth if ($depth > $max_depth); 

		$lastgood = $e;

	}

	return ($firstgood,$lastgood,$atbottom,$w_gap_time);

}

1;