#!/usr/bin/perl
#
# lcov-inject
#
# Copyright © 2014 Guillem Jover <guillem@debian.org>
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

use strict;
use warnings;

use Cwd;
use Devel::Cover::DB;

my $dir = 'scripts';
my $cwd = cwd();

chdir $dir or die "cannot switch to $dir\n";

my $db = Devel::Cover::DB->new(db => 'cover_db');
$db = $db->merge_runs();
$db->calculate_summary(map { $_ => 1 } $db->collected());

chdir $cwd or die "cannot switch to $cwd\n";

my $s = $db->{summary}{Total};

my $tmpl = sprintf '
      <td class="coverFile"><a href="%s">%s</a></td>
      <td class="coverBar" align="center">
        <table border=0 cellspacing=0 cellpadding=1>
          <tr><td class="coverBarOutline">%s</td></tr>
        </table>
      </td>
      %s
      %s
      %s
    </tr>
    <tr>
', "$dir/coverage.html", $dir, bar_html($s->{total}{percentage}),
   box_html($s->{total}), box_html($s->{subroutine}), box_html($s->{branch});

while (<>) {
    s/^(.*<td .*href="src\/index\.html">.*)$/$tmpl$1/;
    print;
}

sub bar_image {
    my ($num) = @_;

    return 'emerald.png' if $num >= 90;
    return 'ruby.png' if $num < 75;
    return 'amber.png';
}

sub bar_html {
    my ($num) = @_;

    my $html = sprintf '<img src="%s" width=%.0f height=10 alt="%.1f">',
                       bar_image($num), $num, $num;

    if ($num < 100) {
        $html .= sprintf '<img src="snow.png" width=%.0f height=10 alt="%.1f">',
                         100 - $num, $num;
    }

    return $html;
}

sub box_rating {
    my ($num) = @_;

    return 'Hi' if $num >= 90;
    return 'Lo' if $num < 75;
    return 'Med';
}

sub box_html {
    my ($stats) = @_;

    return sprintf '<td class="coverPer%s">%.1f&nbsp;%%</td>\n' .
                   '<td class="coverNum%s">%d / %d</td>',
        box_rating($stats->{percentage}), $stats->{percentage},
        box_rating($stats->{percentage}), $stats->{covered}, $stats->{total};
}

1;
