#!/usr/bin/perl

use Module::ScanDeps;
use strict;
use warnings;

use Test::More qw(no_plan); # no_plan because the number of objects in the dependency tree (and hence the number of tests) can change
use T::Utils;
use lib qw(t/data/pluggable);

if (eval {require Module::Pluggable}) {
   my $rv = scan_deps(
      files   => ['t/data/pluggable/Foo.pm'],
      recurse => 1,
   );


   my @deps = qw(Pluggable.pm Foo/Plugin/Bar.pm Foo/Plugin/Baz.pm);
   generic_rv_test($rv, ['t/data/pluggable/Foo.pm'], \@deps);

#   my @used_by = @{$rv->{'Pluggable.pm'}{used_by}};
#   warn "Pluggable.pm used_by: @used_by\n";

#   use Data::Dump qw(dump);
#   print dump $rv;
} else {
   diag("Module::Pluggable not installed, skipping all tests");
}

__END__

##</code><code>##

use strict;
use warnings;

package T::Utils;

use vars qw( $VERSION @ISA @EXPORT );
require Exporter;

use Test::More;

@ISA=qw(Exporter);
$VERSION   = '0.1';
@EXPORT = qw( generic_rv_test );

my $test = Test::More->builder;

sub import {
    my($self) = shift;
    my $pack = caller;

    $test->exported_to($pack);
    $self->export_to_level(1, $self, @EXPORT);
}

sub _path_to_filename {
    my $file = shift @_;
    my ($vol, $dir, $key) = File::Spec->splitpath($file);
    return $key;
}

sub generic_rv_test {
    my $rv = shift;
    my $array_ref = shift;
    my @input_keys = sort @$array_ref;
       $array_ref = shift;
    my @known_deps = sort @$array_ref;
    my @used_by;
    my ($used_by_ok, $i);

    # sanity check input
    foreach my $input (@input_keys) {
      !(grep {$_ eq $input} @known_deps) or die "\@input_keys overlaps with \@known_deps\n";
    }

    $test->ok(ref($rv) eq "HASH", "\$rv is a ref") or return;

    # check all input files and known deps correspond to an entry in rv
    map {$_ = _path_to_filename($_)} @input_keys;
    map {$_ =~ s|\\|\/|go} (@input_keys, @known_deps);
    $test->ok(exists $rv->{$_}, "$_ is in rv") foreach (@input_keys, @known_deps);

    # Check general properties of the keys
    foreach my $key (keys %$rv) {
        $test->ok(((exists($rv->{$key}{key}) && $key eq $rv->{$key}{key})                                   &&
                   (exists($rv->{$key}{file}) && $rv->{$key}{file} =~ /(?:^|[\/\\])$key$/)                  &&
                   (exists($rv->{$key}{type}) && $rv->{$key}{type} =~ /^(?:module|autoload|data|shared)$/)),
                   "For $key: sub-key matches && file matches && type matches module|autoload|data|shared");

        if (exists($rv->{$key}{used_by})) {
            @used_by = sort @{$rv->{$key}{used_by}};
            if ($#used_by + 1 > 0) {
                $used_by_ok = 1;
                if ($#used_by + 1 > 1) {
                    for ($i=0; $i<$#used_by; $i++) {
                        if ($used_by[$i] eq $used_by[$i+1]) { # relies on @used_by being sorted earlier
                             $used_by_ok = 0;
                             last;
                        }
                    }
                }
                $test->ok($used_by_ok, "$key\'s used_by has no duplicates");

                $used_by_ok = 1;
                foreach my $used_by (@used_by) {
                    $used_by_ok &= exists($rv->{$used_by});
                }
                $test->ok($used_by_ok, "All entries in $key\'s used_by are themselves described in \$rv");
            } else {
                print "array length: $#used_by\n";
                $test->ok(0, "$key\'s used_by exists and isn't empty");
            }
        } else {
            $test->ok((grep {$_ eq $key} @input_keys) | ($key =~ m/Plugin/o), "used-by not defined so $key is one of the input files or is a plugin"); # THIS IS WHERE THE TEST FAILS DUE TO THE MISSING USED_BY INFORMATION
        }
    }
}

1;

__END__