#!/usr/bin/perl
use strict;
use warnings;
use Panotools::Script;
use Getopt::Long;
use Pod::Usage;

my $help = 0;
my $positions = 0;
my $roll = 0;
my $pitch = 0;
my $yaw = 0;
my @r;
my @p;
my @y;
my $view = 0;
my $barrel = 0;
my $centre = 0;
my $vignetting = 0;
my $vignetting_centre = 0;
my $response = 0;
my $exposure = 0;
my $white_balance = 0;
my $path_output;

GetOptions ('positions' => \$positions,
            'view' => \$view,
            'barrel' => \$barrel,
            'centre' => \$centre,
            'positions' => \$positions,
            'roll' => \$roll,
            'pitch' => \$pitch,
            'yaw' => \$yaw,
            'r=i' => \@r,
            'p=i' => \@p,
            'y=i' => \@y,
            'vignetting' => \$vignetting,
            'vignetting-centre' => \$vignetting_centre,
            'response' => \$response,
            'exposure' => \$exposure,
            'white-balance' => \$white_balance,
            'o|output=s' => \$path_output,
            'h|help' => \$help);

pod2usage (-verbose => 2) if $help;

my $path_pto = shift || pod2usage;
die "Can't find $path_pto" unless -e $path_pto;
$path_output = $path_pto unless defined $path_output;

my $pto = new Panotools::Script;
$pto->Read ($path_pto);

my $variable = $pto->Variable;

# FIXME assumes image 0 is anchor
$variable->{0}->{v} = $view;

$variable->{0}->{b} = $barrel;

$variable->{0}->{d} = $centre;
$variable->{0}->{e} = $centre;

$variable->{0}->{Vb} = $vignetting;
$variable->{0}->{Vc} = $vignetting;
$variable->{0}->{Vd} = $vignetting;

$variable->{0}->{Vx} = $vignetting_centre;
$variable->{0}->{Vy} = $vignetting_centre;

$variable->{0}->{Ra} = $response;
$variable->{0}->{Rb} = $response;
$variable->{0}->{Rc} = $response;
$variable->{0}->{Rd} = $response;
$variable->{0}->{Re} = $response;

# FIXME assumes image 0 is anchor
for my $index (1 .. scalar @{$pto->Image} -1)
{
    $variable->{$index}->{r} = $positions || $roll;
    $variable->{$index}->{p} = $positions || $pitch;
    $variable->{$index}->{y} = $positions || $yaw;

    $variable->{$index}->{Eev} = $exposure;

    $variable->{$index}->{Er} = $white_balance;
    $variable->{$index}->{Eb} = $white_balance;
}

$variable->{$_}->{r} = 1 for (@r);
$variable->{$_}->{p} = 1 for (@p);
$variable->{$_}->{y} = 1 for (@y);

$pto->Write ($path_output);

__END__

=head1 NAME

ptovariable - prepare a pto project for typical optimisation tasks

=head1 SYNOPSIS

ptovariable [options] project.pto

 Options:
       --positions          Optimise positions
       --roll               Optimise roll for all images except anchor if --positions not set
       --pitch              Optimise pitch for all images except anchor if --positions not set
       --yaw                Optimise yaw for all images except anchor if --positions not set
       -r <num> <num> <..>  Optimise roll for specified images
       -p <num> <num> <..>  Optimise pitch for specified images
       -y <num> <num> <..>  Optimise yaw for specified images
       --view               Optimise angle of view
       --barrel             Optimise barrel distortion
       --centre             Optimise optical centre
       --vignetting         Optimise vignetting
       --vignetting-centre  Optimise vignetting centre
       --response           Optimise camera response EMoR parameters
       --exposure           Optimise exposure (EV)
       --white-balance      Optimise colour balance
  -o | --output OUTFILE     Specify output file default is to overwrite input       
  -h | --help               Outputs help documentation

=head1 DESCRIPTION

B<ptovariable> sets optimisation variable 'v' lines for a hugin .pto project.
Usually this is a preparation for optimisation with autooptimiser or
vig_optimize.

=head1 EXAMPLES

This performs the equivalent of the 'Positions, View and Barrel (y,p,r,v,b)'
preset on the hugin Optimiser tab:

  ptovariable --positions --view --barrel project.pto
  autooptimiser -n -o project.pto project.pto

This is the equivalent of the 'Low dynamic range' preset on the hugin Exposure
tab:

  ptovariable --vignetting --response --exposure project.pto
  vig_optimize -o project.pto project.pto

Additionally individual parameters can be set for particular photos:

  ptovariable -r 1 2 3 4 -p 4 project.pto

=head1 LICENSE

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

=head1 SEE ALSO

L<http://hugin.sourceforge.net/>

=head1 AUTHOR

Bruno Postle - April 2009.

=cut