#!/usr/bin/perl

use strict;
use warnings;

use lib 't/lib';
use Utils qw/is_array_between/;

use Test::More tests => 4;

use Statistics::Descriptive::Smoother;

local $SIG{__WARN__} = sub { };

my @original_data    = (1 .. 10);
my @original_samples = (100, 50, 100, 50, 100, 50, 100, 50, 100, 50,);

{

    #Test no smoothing
    my $smoother = Statistics::Descriptive::Smoother->instantiate({
           method   => 'weightedExponential',
           coeff    => 0,
           data     => \@original_data,
           samples  => \@original_samples,
    });

    my @smoothed_data = $smoother->get_smoothed_data();

    # When the smoothing coefficient is 0 the series is not smoothed
    # TEST
    is_deeply( \@smoothed_data, \@original_data, 'No smoothing C=0');
}

{

    #Test max smoothing
    my $smoother = Statistics::Descriptive::Smoother->instantiate({
           method   => 'weightedExponential',
           coeff    => 1,
           data     => \@original_data,
           samples  => \@original_samples,
    });

    my @smoothed_data = $smoother->get_smoothed_data();

    # When the smoothing coefficient is 1 the series is universally equal to the initial unsmoothed value
    my @expected_values = map { $original_data[0] } 1 .. $smoother->{count};
    # TEST
    is_deeply( \@smoothed_data, \@expected_values, 'Max smoothing C=1');
}

{

    #Test smoothing coeff 0.5
    my $smoother = Statistics::Descriptive::Smoother->instantiate({
           method   => 'weightedExponential',
           coeff    => 0.5,
           data     => \@original_data,
           samples  => \@original_samples,
    });

    my @smoothed_data = $smoother->get_smoothed_data();
    my @expected_values = (
                    1,
                    1.33333333333333,
                    2.24242424242424,
                    2.85944551901999,
                    4.0651836704636,
                    4.75526654493058,
                    6.03174342835728,
                    6.7367839208657,
                    8.02706266125788,
                    8.73457937329917,
    );

    # TEST
    is_array_between( \@smoothed_data, \@expected_values, 1E-13, 1E-13, 'Smoothing with C=0.5');
}

{

    #Test different number of samples and data are not allowed
    my $smoother = Statistics::Descriptive::Smoother->instantiate({
           method   => 'weightedExponential',
           coeff    => 0,
           data     => [1,2,3,4],
           samples  => [1,2,3],
    });

    # TEST
    is ( $smoother, undef, 'Different number of samples and data');
}


1;

=pod

=head1 AUTHOR

Fabio Ponciroli

=head1 COPYRIGHT

Copyright(c) 2012 by Fabio Ponciroli.

=head1 LICENSE

This file is licensed under the MIT/X11 License:
http://www.opensource.org/licenses/mit-license.php.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

=cut