package Graphics::Color::RGB;
use Moose;
use MooseX::Aliases;

extends qw(Graphics::Color);

use Color::Library;
use Graphics::Color::HSL;
use Graphics::Color::HSV;

use Graphics::Color::Types qw(NumberOneOrLess);

has 'red' => (
    is => 'rw',
    isa => NumberOneOrLess,
    default => 1,
    alias  => 'r'
);
has 'green' => (
    is => 'rw',
    isa => NumberOneOrLess,
    default => 1,
    alias => 'g'
);
has 'blue' => (
    is => 'rw',
    isa => NumberOneOrLess,
    default => 1,
    alias => 'b'
);
has 'alpha' => (
    is => 'rw',
    isa => NumberOneOrLess,
    default => 1,
    alias => 'a'
);
has 'name' => ( is => 'rw', isa => 'Str' );

sub as_string {
    my ($self) = @_;

    return sprintf('%0.2f,%0.2f,%0.2f,%0.2f',
        $self->red, $self->green,
        $self->blue, $self->alpha
    );
}

sub as_integer_string {
    my ($self) = @_;

    return sprintf("%d, %d, %d, %0.2f",
        $self->red * 255, $self->green * 255, $self->blue * 255, $self->alpha
    );
}

sub as_css_hex {
    my ($self) = @_;

    return $self->as_hex_string('#');
}

sub as_hex_string {
    my ($self, $prepend) = @_;

    $prepend = '' unless defined($prepend);

    return sprintf('%s%.2x%.2x%.2x',
        $prepend, $self->red * 255, $self->green * 255, $self->blue * 255
    );
}

sub as_percent_string {
    my ($self) = @_;

    return sprintf("%d%%, %d%%, %d%%, %0.2f",
        $self->red * 100, $self->green * 100, $self->blue * 100, $self->alpha
    );
}

sub as_array {
    my ($self) = @_;

    return ($self->red, $self->green, $self->blue);
}

sub as_array_with_alpha {
    my ($self) = @_;

    return ($self->red, $self->green, $self->blue, $self->alpha);
}

sub equal_to {
    my ($self, $other) = @_;

    return 0 unless defined($other);

    unless($self->red == $other->red) {
        return 0;
    }
    unless($self->green == $other->green) {
        return 0;
    }
    unless($self->blue == $other->blue) {
        return 0;
    }
    unless($self->alpha == $other->alpha) {
        return 0;
    }

    return 1;
}

sub from_color_library {
	my ($self, $id) = @_;

	my $color;
	if(ref($id)) {
		$color = $id;
	} else {
		$color = Color::Library->color($id);
		unless(defined($color)) {
			die("Couldn't find color for '$id'!");
		}
	}

	my ($r, $g, $b) = $color->rgb;
	return Graphics::Color::RGB->new(
		red => $r / 255,
		green => $g / 255,
		blue => $b / 255
	);
}

sub from_hex_string {
    my ($self, $hex) = @_;

    # Get rid of the leading # if it's there
    $hex =~ s/^#//g;
    $hex = lc($hex);

    my $len = length($hex);

    if(length($hex) == 3) {
        $hex =~ /([a-f0-9])([a-f0-9])([a-f0-9])/;
        $hex = "$1$1$2$2$3$3";
    }

    if(length($hex) == 6) {
        $hex =~ /([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})/;

        return Graphics::Color::RGB->new(
            red => hex($1) / 255,
            green => hex($2) / 255,
            blue => hex($3) / 255
        );
    }

    # Not a valid hex color
    return undef;
}

sub to_hsl {
	my ($self) = @_;

	my $max = $self->red;
	my $maxc = 'r';
	my $min = $self->red;

	if($self->green > $max) {
		$max = $self->green;
		$maxc = 'g';
	}
	if($self->blue > $max) {
		$max = $self->blue;
		$maxc = 'b';
	}

	if($self->green < $min) {
		$min = $self->green;
	}
	if($self->blue < $min) {
		$min = $self->blue;
	}

	my ($h, $s, $l);

	if($max == $min) {
		$h = 0;
	} elsif($maxc eq 'r') {
		$h = 60 * (($self->green - $self->blue) / ($max - $min)) % 360;
	} elsif($maxc eq 'g') {
		$h = (60 * (($self->blue - $self->red) / ($max - $min)) + 120);
	} elsif($maxc eq 'b') {
		$h = (60 * (($self->red - $self->green) / ($max - $min)) + 240);
	}

	$l = ($max + $min) / 2;

	if($max == $min) {
		$s = 0;
	} elsif($l <= .5) {
		$s = ($max - $min) / ($max + $min);
	} else {
		$s = ($max - $min) / (2 - ($max + $min));
	}

	return Graphics::Color::HSL->new(
		hue => $h, saturation => $s, lightness => $l, alpha => $self->alpha
	);
}

sub to_hsv {
	my ($self) = @_;

	my $max = $self->red;
	my $maxc = 'r';
	my $min = $self->red;

	if($self->green > $max) {
		$max = $self->green;
		$maxc = 'g';
	}
	if($self->blue > $max) {
		$max = $self->blue;
		$maxc = 'b';
	}

	if($self->green < $min) {
		$min = $self->green;
	}
	if($self->blue < $min) {
		$min = $self->blue;
	}

	my ($h, $s, $v);

	if($max == $min) {
		$h = 0;
	} elsif($maxc eq 'r') {
		$h = 60 * (($self->green - $self->blue) / ($max - $min)) % 360;
	} elsif($maxc eq 'g') {
		$h = (60 * (($self->blue - $self->red) / ($max - $min)) + 120);
	} elsif($maxc eq 'b') {
		$h = (60 * (($self->red - $self->green) / ($max - $min)) + 240);
	}

	$v = $max;
	if($max == 0) {
		$s = 0;
	} else {
		$s = 1 - ($min / $max);
	}

	return Graphics::Color::HSV->new(
		hue => $h, saturation => $s, value => $v, alpha => $self->alpha
	);
}

__PACKAGE__->meta->make_immutable;

no Moose;
1;
__END__

=head1 NAME

Graphics::Color::RGB - RGB color model

=head1 DESCRIPTION

Graphics::Color::RGB represents a Color in the sRGB color space.  Individual
color channels are expressed as decimal values from 0 to 1.  Convenience
methods are supplied to convert to various string values.

=head1 SYNOPSIS

    use Graphics::Color::RGB;

    my $color = Graphics::Color::RGB->new({
        red     => 1,
        blue    => .31,
        green   => .25,
    });

=head1 CONSTRUCTOR

=head2 Graphics::Color::RGB->new(%options)

Creates a new Graphics::Color::RGB.

=head1 METHODS

=head2 equal_to

Compares this color to the provided one.  Returns 1 if true, else 0;

=head2 not_equal_to

The opposite of equal_to.

=head2 red

=head2 r

Set/Get the red component of this Color.  Aliased to 'r' as well.

=head2 green

=head2 g

Set/Get the green component of this Color. Aliased to 'g' as well.

=head2 blue

=head2 b

Set/Get the blue component of this Color. Aliased to 'b' as well.

=head2 alpha

=head2 a

Set/Get the alpha component of this Color. Aliased to 'a' as well.

=head2 name

Get the name of this color.  Only valid if the color was created by name.

=head2 as_array

Get the RGB values as an array

=head2 as_array_with_alpha

Get the RGBA values as an array

=head2 as_css_hex

Return a hex formatted value with a prepended '#' for use in CSS and HTML.

=head2 as_hex_string ( [$prepend] )

Return a hex formatted value for this color.  The output ignores the alpha
channel because, per the W3C, there is no hexadecimal notiation for an RGBA
value. Optionally allows you to include a string that will be prepended. This
is a common way to add the C<#>.

=head2 as_integer_string

Return an integer formatted value for this color.  This format is suitable for
CSS RGBA values.

=head2 as_percent_string

Return a percent formatted value for this color.  This format is suitable for
CSS RGBA values.

=head2 as_string

Get a string version of this Color in the form of RED,GREEN,BLUE,ALPHA

=head2 from_color_library(color-id)

Attempts to retrieve the specified color-id using L<Color::Library>.  The
result is then converted into a Graphics::Color::RGB object.

=head2 to_hsl

Creates this RGB color in HSL space.  Returns a L<Graphics::Color::HSL> object.

=head2 to_hsv

Creates this RGB color in HSV space.  Returns a L<Graphics::Color::HSV> object.

=head1 AUTHOR

Cory Watson, C<< <gphat@cpan.org> >>

=head1 SEE ALSO

perl(1), L<http://en.wikipedia.org/wiki/RGB_color_space>

=head1 COPYRIGHT & LICENSE

Copyright 2008 - 2009 by Cory G Watson

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