#!/usr/bin/perl

# This version holds the tones for longer than the normal version --
# 25 minutes on and 5 minutes off, compared to 5:5 for the normal
# version.

# Enter wake-up hour as hh or hh:mm as first argument, if required

$tar= 7;	# 7am
if (@ARGV && ($ARGV[0] =~ /^(\d+):(\d+)$/)) {
    shift;
    $tar= $1 + $2 / 60;
} elsif (@ARGV && ($ARGV[0] =~ /^(\d+)$/)) {
    shift;
    $tar= $1;
}

printf "Generating tones from 21:00 -> %02d:%02d\n", int($tar), int(60 * ($tar - int($tar)));

my @ts= ();	# Tone-sets
my @tl= ();	# Time-lines

# Binaural range
my $r0= 0.2;
my $r1= 1.0;
my $lr0= log $r0;
my $lr1= log $r1;

# Carrier range
my $cr0= 60;
my $cr1= 120;
my $lcr0= log $cr0;
my $lcr1= log $cr1;

my $cnt= 0;
while (1) {
    $hh= -3 + int($cnt / 6);
    $mm= 10 * ($cnt % 6);
    last if ($hh + $mm/60 >= $tar);
    $hh += 24 if ($hh < 0);
    
    $bb= exp($lr0 + ($lr1 - $lr0) * rand);
    $cc= exp($lcr0 + ($lcr1 - $lcr0) * rand);
    $dmy= rand;
    push @ts, sprintf "t%02d: %.2f+%5.3f/40 %.2f+4.2/10\n", $cnt, $cc, $bb, $cc * 2;
    push @tl, sprintf "%02d:%02d t%02d\n", $hh, $mm, $cnt;
    push @tl, sprintf "%02d:%02d off\n", $hh, $mm+25;
    $cnt+=3;

    # Alternative version for 15 minutes on, 5 minutes off:
    #    push @tl, sprintf "%02d:%02d off\n", $hh, $mm+15;
    #    $cnt+=2;
}

die unless open OUT, ">tmp-prog";
print OUT <<END;
#
#       The idea of this sequence is to play random tones in the sub
#       1.0Hz band all night, accompanied by a 4.2Hz tone to somehow
#       provide a kind of link up to consciousness.
#
#	This file was AUTOMATICALLY GENERATED
#

END

print OUT @ts;
print OUT <<END;
off: -
wakeup: 100+0.92/20 200+4.2/20 400+7/40

END
print OUT @tl;
printf OUT "%02d:%02d wakeup\n", int($tar), int(60 * ($tar - int($tar)));
printf OUT "%02d:%02d off\n", 1 + int($tar), int(60 * ($tar - int($tar)));
die unless close OUT;

exec "sbagen tmp-prog";
die;