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#!/usr/bin/perl -w

use strict;

use YAML qw/LoadFile/;
use XML::Simple;
use Template;
use DateTime;
#use Data::Dump qw/dd/;

my $config_file = '/usr/share/mga-treasurer/config';
my $config = LoadFile($ENV{MGATRES_CONF} ? $ENV{MGATRES_CONF} : $config_file);
my $etc_config_file = '/etc/mga-treasurer.conf';
my $etc_config = LoadFile($etc_config_file);

foreach my $k (keys %{$etc_config}) {
    $config->{$k} = $etc_config->{$k};
}


sub donation_category {
    my $r = shift;
    my @c = grep {$_->{Na} eq 'Donation'} @{$r->{Category}};
    return @c ? $c[0]->{Nb} : undef;
}

sub party_name {
    my ($r, $Nb) = @_;
    (grep { $_->{Nb} == $Nb } @{$r->{Party}})[0]->{Na};
}

sub subcat_name {
    my ($r, $Nb, $Nbc) = @_;
    (grep { $_->{Nb} == $Nb && $_->{Nbc} == $Nbc }
        @{$r->{Sub_category}})[0]->{Na};
}

sub epoch_date {
    my ($m, $d, $y) = split /\//, shift;
    DateTime->new(day => $d, month => $m, year => $y)->epoch;
}

sub donations_list {
    my $r = shift;
    my @res;
    my $don_cat = donation_category($r);
    my @donations = grep { $_->{Ca} == $don_cat } @{$r->{Transaction}};
    foreach my $don (@donations) {
        my %d = (
            amount => $don->{Am},
            date   => epoch_date($don->{Dt}),
            who    => party_name($r, $don->{Pa}),
            type   => subcat_name($r, $don->{Sca}, $don_cat),
            $don->{No} ne '(null)' ? (notes  => $don->{No}) : (),
        );
        push @res, \%d;
    }
    return \@res;
}

sub donations_infos {
    my $r = shift;
    my %res = (
        donations => donations_list($r),
        by_month  => {},
        by_year   => {},
        total_30  => 0,
    );
    foreach my $don (@{$res{donations}}) {
        my $dt = DateTime->from_epoch(epoch => $don->{date});
        my $month = $dt->year . '-' . $dt->month;
        my $year = $dt->year;
        push @{$res{by_month}->{$month}->{donations}}, $don;
        $res{by_month}->{$month}->{year} = $year;
        $res{by_month}->{$month}->{month} = $dt->month;
        push @{$res{by_year}->{$year}->{donations}}, $don;
        push @{$res{by_year}->{$year}->{months}}, $month;
        if (time - $don->{date} < '2592000') { # last 30 days
            $res{total_30} += $don->{amount};
        }
    }
    foreach my $d ((values $res{by_month}), (values $res{by_year})) {
        foreach my $don (@{$d->{donations}}) {
            $d->{total} += $don->{amount};
            $d->{type}->{$don->{type}} += $don->{amount};
        }
    }
    return \%res;
}

sub process_template {
    my ($template, $src, $vars, $dest) = @_;
    foreach my $extension (@{$config->{output_format}}) {
        next unless -f "$config->{tmpl_dir}/$src.$extension";
        $template->process("$src.$extension", $vars, "$dest.$extension");
    }
}

sub output_pages {
    my ($donations) = @_;
    my $template = Template->new(
        INCLUDE_PATH => $config->{tmpl_dir},
        OUTPUT_PATH  => $config->{out_dir},
    );

    my $last_update = (stat $config->{grisbi_file})[9];
    foreach my $month (keys $donations->{by_month}) {
        my $vars = {
            config    => $config,
            month     => $month,
            donations => $donations,
        };
        process_template($template, 'donations_by_month', $vars, "donations_$month");
    }

    foreach my $year (keys $donations->{by_year}) {
        my $vars = {
            config    => $config,
            year      => $year,
            donations => $donations,
        };
        process_template($template, 'donations_by_year', $vars, "donations_$year");
    }

    my $vars = {
        config      => $config,
        donations   => $donations,
        last_update => $last_update,
    };
    process_template($template, 'donations', $vars, 'donations');
}

my $r = XMLin($config->{grisbi_file});
my $donations = donations_infos($r);

output_pages($donations);