#!perl -w
use strict;
use Config;
use ExtUtils::Manifest 'maniread';
use Cwd;
use Getopt::Long;

my @tests;
my $verbose;
my $nodc;
my $make_opts = "";
my $regen_only;
GetOptions("t|test=s" => \@tests,
	   "m=s" => \$make_opts,
	   "n" => \$nodc,
	   "v" => \$verbose,
	   "r" => \$regen_only)
  or die;

my $do_build = !$regen_only;
if ($do_build) {
  my $make = $Config{make};
  # if there's a way to make with profiling for a recursive build like
  # Imager I don't see how
  if (-f 'Makefile') {
    run("$make clean");
  }
  run("cover -delete");
  run("$^X Makefile.PL --coverage @ARGV")
    and die "Makefile.PL failed\n";
  run("$make $make_opts 'OTHERLDFLAGS=-ftest-coverage -fprofile-arcs'")
    and die "build failed\n";

  {
    local $ENV{DEVEL_COVER_OPTIONS} = "-db," . getcwd() . "/cover_db,-coverage,statement,branch,condition,subroutine";
    my $makecmd = "$make test";
    $makecmd .= " TEST_VERBOSE=1" if $verbose;
    $makecmd .= " HARNESS_PERL_SWITCHES=-MDevel::Cover" unless $nodc;
    if (@tests) {
      $makecmd .= " TEST_FILES='@tests'";
    }
    run($makecmd)
      and die "Test failed\n";
  }
}

# build gcov files
my $mani = maniread();
# split by directory
my %paths;
for my $filename (keys %$mani) {
  next unless $filename =~ /\.(xs|c|im)$/;
  (my $gcda = $filename) =~ s/\.\w+$/.gcda/;
  next unless -f $gcda;
  if ($filename =~ m!^(\w+)/(\w+\.\w+)$!) {
    push @{$paths{$1}}, $2;
  }
  else {
    push @{$paths{''}}, $filename;
  }
  if ($filename =~ s/\.(xs|im)$/.c/) {
    if ($filename =~ m!^(\w+)/(\w+\.\w+)$!) {
      push @{$paths{$1}}, $2;
    }
    else {
      push @{$paths{''}}, $filename;
    }
  }
}

my $gcov2perl = $Config{sitebin} . "/gcov2perl";

for my $path (keys %paths) {
  if ($path) {
    run("cd $path ; gcov -abc @{$paths{$path}} ; cd ..");
  }
  else {
    run("gcov -abc @{$paths{$path}}");
  }
  my $dir = $path ? $path : '.';
  for my $file (@{$paths{$path}}) {
    run("$gcov2perl $dir/$file.gcov");
  }
}

my @dbs = "cover_db", map "$_/cover_db", grep $_, keys %paths;
# we already ran gcov
run("cover -nogcov -ignore_re '^t/'");

sub run {
  my $cmd = shift;

  print "Running: $cmd\n" if $verbose;
  return system $cmd;
}

=head1 NAME

imcover.perl - perform C and perl coverage testing for Imager

=head1 SYNOPSIS

  perl imcover.perl [-m=...][-t=...][-n][-v][-r] -- ... Makefile.PL options

=head1 DESCRIPTION

Builds Imager with the C< -ftest-coverage -fprofile-arcs > gcc options
and then runs perl's tests.

=cut