package Chemistry::PointGroup::Oh;

use 5.008001;
use strict;
use warnings;

our $VERSION = '0.01';

my $h  = 48; # number of group elements
my @R  = qw( E C3 C2 C4 C2f i S4 S6 sh sd ); # symmetry elements of Oh
my @hi = qw( 1  8  6  6  3  1  6  8  3  6 ); # number of elements in the i-th class
my @I  = qw( A1g A2g Eg T1g T2g A1u A2u Eu T1u T2u ); # irreducible representations
my %R;
@R{@R}=@hi;

# characters of the irreducible representations of Oh
my @A1g = qw( 1  1  1  1  1  1  1  1  1  1 );
my @A2g = qw( 1  1 -1 -1  1  1 -1  1  1 -1 );
my @Eg  = qw( 2 -1  0  0  2  2  0 -1  2  0 );
my @T1g = qw( 3  0 -1  1 -1  3  1  0 -1 -1 );
my @T2g = qw( 3  0  1 -1 -1  3 -1  0 -1  1 );
my @A1u = qw( 1  1  1  1  1 -1 -1 -1 -1 -1 );
my @A2u = qw( 1  1 -1 -1  1 -1  1 -1 -1  1 );
my @Eu  = qw( 2 -1  0  0  2 -2  0  1 -2  0 );
my @T1u = qw( 3  0 -1  1 -1 -3 -1  0  1  1 );
my @T2u = qw( 3  0  1 -1 -1 -3  1  0  1 -1 );

# my (%A1g, %A2g, %Eg, %T1g, %T2g, %A1u, %A2u, %Eu, %T1u, %T2u);
# @A1g{@R} = @A1g; # A1g
# @A2g{@R} = @A2g; # A2g
# @Eg{@R} = @Eg; # Eg
# @T1g{@R} = @T1g; # T1g
# @T2g{@R} = @T2g; # T2g
# @A1u{@R} = @A1u; # A1u
# @A2u{@R} = @A2u; #A2u
# @Eu{@R} = @Eu; # Eu
# @T1u{@R} = @T1u; # T1u
# @T2u{@R} = @T2u; # T2u

sub new {
	my $type = shift;
	$type = ref($type) || $type;
	my %Ur   = @_;
	return bless \%Ur, $type;
}

sub character_tables {
return <<'TABLE';
+-----+---------------------------------------------------+-------+
|  Oh |  E   8C3  6C2  6C4  3C2f  i   6S4  8S6  3sh  6sd  |       |
+-----+---------------------------------------------------+-------+
| A1g |  1    1    1    1    1    1    1    1    1    1   |       |
| A2g |  1    1   -1   -1    1    1   -1    1    1   -1   |       |
|  Eg |  2   -1    0    0    2    2    0   -1    2    0   |       |
| T1g |  3    0   -1    1   -1    3    1    0   -1   -1   |       |
| T2g |  3    0    1   -1   -1    3   -1    0   -1    1   |       |
| A1u |  1    1    1    1    1   -1   -1   -1   -1   -1   |       |
| A2u |  1    1   -1   -1    1   -1    1   -1   -1    1   |       |
|  Eu |  2   -1    0    0    2   -2    0    1   -2    0   |       |
| T1u |  3    0   -1    1   -1   -3   -1    0    1    1   | x,y,z |
| T2u |  3    0    1   -1   -1   -3    1    0    1   -1   |       |
+-----+---------------------------------------------------+-------+  
TABLE
}

sub symmetry_elements {
	return @R;
}

sub normal_modes {
	my $self = shift;
	return (3 * $self->{E} - 6);
}

sub irr {
	my $self = shift;
	# E C3 C2 C4 C2f i S4 S6 sh sd
	# proper operations   ( Ur - 2 ) (1 + 2 cos(r))
	my $X_E   = sprintf "%0.f",  ($self->{E}   - 2) * (1  + 2 * 1);
	my $X_C3  = sprintf "%0.f",  ($self->{C3}  - 2) * (1  + 2 * (-0.5));
	my $X_C2  = sprintf "%0.f",  ($self->{C2}  - 2) * (1  + 2 * (-1));
	my $X_C4  = sprintf "%0.f",  ($self->{C4}  - 2) * (1  + 2 * 0);
	my $X_C2f = sprintf "%0.f",  ($self->{C2f} - 2) * (1  + 2 * (-1));
	
	# improper operations  Ur (-1 + 2 cos(r))
	my $X_i  = sprintf "%0.f",  $self->{i}  * (-1  + 2 * (-1));
	my $X_S4 = sprintf "%0.f",  $self->{S4} * (-1  + 2 * 0);
	my $X_S6 = sprintf "%0.f",  $self->{S6} * (-1  + 2 * (0.5));
	my $X_sh = sprintf "%0.f",  $self->{sh} * (-1  + 2 * 1);
	my $X_sd = sprintf "%0.f",  $self->{sd} * (-1  + 2 * 1);
	
	# in the same order of @hi
	my @rr = ($X_E, $X_C3, $X_C2, $X_C4, $X_C2f,
	          $X_i, $X_S4, $X_S6, $X_sh, $X_sd);
	
	# Irreducible representation
	my $s = 0;
	my $n_A1g = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $A1g[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_A2g = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $A2g[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_Eg = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $Eg[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_T1g = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $T1g[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_T2g = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $T2g[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_A1u = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $A1u[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_A2u = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $A2u[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_Eu = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $Eu[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_T1u = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $T1u[$_] , $s] } (0..$#hi))[-1]->[1];

	$s = 0;
	my $n_T2u = sprintf"%0.f", 
	(1/$h)*(map { [ $s += $hi[$_] * $rr[$_] * $T2u[$_] , $s] } (0..$#hi))[-1]->[1];

	my @ri = ($n_A1g, $n_A2g, $n_Eg, $n_T1g, $n_T2g,
	          $n_A1u, $n_A2u, $n_Eu, $n_T1u, $n_T2u);

	my %ri = ();
	@ri{@I} = @ri;
	return %ri;
}
1;

__END__

=head1 NAME

Chemistry::PointGroup::Oh - Point group Oh

=head1 SYNOPSIS

see L<Chemistry::PointGroup>

=head1 DESCRIPTION

see L<Chemistry::PointGroup>

=head1 SEE ALSO

L<Chemistry::PointGroup>

=head1 AUTHOR

Leo Manfredi, E<lt>manfredi@cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2006 by Leo Manfredi

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself. 

=cut