#!/usr/bin/perl -w
use strict;
use warnings;

use File::Find;
use IO::Handle;

die "Unsupported";

##############################################################################

=head1 NAME

tprove_gtk - Simple proof of concept GUI for proving tests

=head1 USAGE

 tprove_gtk [ list of test files ]

=head1 DESCRIPTION

I've included this in the distribution.  It's a gtk interface by Torsten
Schoenfeld.  I've not run it myself.

C<tprove_gtk> is not installed on your system unless you explicitly copy it
somewhere in your path.  The current incarnation B<must> be run in a directory
with both C<t/> and C<lib/> (i.e., the standard "root" level directory in
which CPAN style modules are developed).  This will probably change in the
future.  As noted, this is a proof of concept.

=head1 CAVEATS

This is alpha code.  You've been warned.

=cut

my @tests;
if (@ARGV) {
    @tests = @ARGV;
}
else {
    find(
        sub { -f && /\.t$/ && push @tests => $File::Find::name },
        "t"
    );
}

pipe( my $reader, my $writer );

# Unfortunately, autoflush-ing seems to be a big performance problem.  If you
# don't care about "real-time" progress bars, turn this off.
$writer->autoflush(1);

if ( my $pid = fork ) {
    close $writer;

    my $gui = Gui->new( $pid, $reader );
    $gui->add_tests(@tests);
    $gui->run();
}

else {
    die "Cannot fork: $!" unless defined $pid;
    close $reader;

    my $runner = TestRunner->new($writer);
    $runner->add_tests(@tests);
    $runner->run();

    close $writer;
}

###############################################################################
# --------------------------------------------------------------------------- #
###############################################################################

package Gui;

use Glib qw(TRUE FALSE);
use Gtk2 -init;

use constant {
    COLUMN_FILENAME => 0,
    COLUMN_TOTAL    => 1,
    COLUMN_RUN      => 2,
    COLUMN_PASS     => 3,
    COLUMN_FAIL     => 4,
    COLUMN_SKIP     => 5,
    COLUMN_TODO     => 6,
};

BEGIN {
    if ( !Gtk2->CHECK_VERSION( 2, 6, 0 ) ) {
        die("$0 needs gtk+ >= 2.6");
    }
}

DESTROY {
    my ($self) = @_;

    if ( defined $self->{reader_source} ) {
        Glib::Source->remove( $self->{reader_source} );
    }
}

sub new {
    my ( $class, $child_pid, $reader ) = @_;

    my $self = bless {}, $class;

    $self->create_window();
    $self->create_menu();
    $self->create_view();

    $self->{child_pid}     = $child_pid;
    $self->{child_running} = TRUE;

    $self->{reader_source} = Glib::IO->add_watch(
        fileno $reader, [qw(in pri hup)],
        \&_callback_reader, $self
    );

    return $self;
}

sub add_tests {
    my ( $self, @tests ) = @_;

    my $model = $self->{_model};

    $self->{_path_cache} = {};

    foreach my $test (@tests) {
        my $iter = $model->append();
        $model->set( $iter, COLUMN_FILENAME, $test );
        $self->{_path_cache}->{$test} = $model->get_path($iter);
    }
}

sub create_window {
    my ($self) = @_;

    my $window = Gtk2::Window->new();
    my $vbox = Gtk2::VBox->new( FALSE, 5 );

    $window->add($vbox);
    $window->set_title("Test Runner");
    $window->set_default_size( 300, 600 );
    $window->signal_connect( delete_event => \&_callback_quit, $self );

    $self->{_window} = $window;
    $self->{_vbox}   = $vbox;
}

sub create_menu {
    my ($self) = @_;

    my $window = $self->{_window};
    my $vbox   = $self->{_vbox};

    my $ui = <<"UI";
<ui>
  <menubar>
    <menu action="test_menu">
      <menuitem action="quit_item" />
    </menu>
  </menubar>
</ui>
UI

    my $actions = [
        [ "test_menu", undef, "_Tests" ],
        [   "quit_item",
            "gtk-quit",
            "_Quit",
            "<control>Q",
            "Quit the test runner",
            sub { _callback_quit( undef, undef, $self ) },
        ],
    ];

    my $action_group = Gtk2::ActionGroup->new("main");
    $action_group->add_actions($actions);

    my $manager = Gtk2::UIManager->new();
    $manager->insert_action_group( $action_group, 0 );
    $manager->add_ui_from_string($ui);

    my $menu_box = Gtk2::VBox->new( FALSE, 0 );
    $manager->signal_connect(
        add_widget => sub {
            my ( $manager, $widget ) = @_;
            $menu_box->pack_start( $widget, FALSE, FALSE, 0 );
        }
    );

    $vbox->pack_start( $menu_box, FALSE, FALSE, 0 );
    $window->add_accel_group( $manager->get_accel_group() );

    $self->{_manager} = $manager;
}

sub create_view {
    my ($self) = @_;

    my $window = $self->{_window};
    my $vbox   = $self->{_vbox};

    my $scroller = Gtk2::ScrolledWindow->new();
    $scroller->set_policy( "never", "automatic" );

    my $model = Gtk2::ListStore->new(

        #  filename     total     run       pass      fail      skip      todo
        qw(Glib::String Glib::Int Glib::Int Glib::Int Glib::Int Glib::Int Glib::Int)
    );
    my $view = Gtk2::TreeView->new($model);

 # ------------------------------------------------------------------------- #

    my $column_filename = Gtk2::TreeViewColumn->new_with_attributes(
        "Filename",
        Gtk2::CellRendererText->new(),
        text => COLUMN_FILENAME
    );
    $column_filename->set_sizing("autosize");
    $column_filename->set_expand(TRUE);
    $view->append_column($column_filename);

 # ------------------------------------------------------------------------- #

    my $renderer_progress = Gtk2::CellRendererProgress->new();
    my $column_progress   = Gtk2::TreeViewColumn->new_with_attributes(
        "Progress",
        $renderer_progress
    );
    $column_progress->set_cell_data_func(
        $renderer_progress,
        sub {
            my ( $column, $renderer, $model, $iter ) = @_;

            my ( $total, $run )
              = $model->get( $iter, COLUMN_TOTAL, COLUMN_RUN );

            if ( $run == 0 ) {
                $renderer->set(
                    text  => "",
                    value => 0
                );
                return;
            }

            if ( $total != 0 ) {
                $renderer->set(
                    text  => "$run/$total",
                    value => $run / $total * 100
                );
            }
            else {
                $renderer->set(
                    text  => $run,
                    value => 0
                );
            }
        }
    );
    $view->append_column($column_progress);

 # ------------------------------------------------------------------------- #

    my @count_columns = (
        [ "Pass", COLUMN_PASS ],
        [ "Fail", COLUMN_FAIL ],
        [ "Skip", COLUMN_SKIP ],
        [ "Todo", COLUMN_TODO ],
    );

    foreach (@count_columns) {
        my ( $heading, $column_number ) = @{$_};

        my $renderer = Gtk2::CellRendererText->new();
        $renderer->set( xalign => 1.0 );

        my $column = Gtk2::TreeViewColumn->new_with_attributes(
            $heading,
            $renderer,
            text => $column_number
        );

        $view->append_column($column);
    }

 # ------------------------------------------------------------------------- #

    $scroller->add($view);
    $vbox->pack_start( $scroller, TRUE, TRUE, 0 );

    $self->{_view}  = $view;
    $self->{_model} = $model;
}

sub run {
    my ($self) = @_;

    $self->{_window}->show_all();

    Gtk2->main();
}

# --------------------------------------------------------------------------- #

sub _callback_reader {
    my ( $fileno, $condition, $self ) = @_;

    if ( $condition & "in" || $condition & "pri" ) {
        my $data = <$reader>;

        if ( $data !~ /^[^\t]+ \t \d+ \t \d+ \t \d+ \t \d+ \t \d+ \t \d+$/x )
        {
            return TRUE;
        }

        my ( $filename, $total, $run, $pass, $fail, $skip, $todo )
          = split /\t/, $data;

        my $view       = $self->{_view};
        my $model      = $self->{_model};
        my $path_cache = $self->{_path_cache};

        if ( $path_cache->{$filename} ) {
            my $iter = $model->get_iter( $path_cache->{$filename} );
            $model->set(
                $iter,
                COLUMN_TOTAL, $total,
                COLUMN_RUN,   $run,
                COLUMN_PASS,  $pass,
                COLUMN_FAIL,  $fail,
                COLUMN_SKIP,  $skip,
                COLUMN_TODO,  $todo
            );
            $view->scroll_to_cell( $path_cache->{$filename} );
        }
    }

    elsif ( $condition & "hup" ) {
        $self->{child_running} = FALSE;
        return FALSE;
    }

    else {
        warn "got unknown condition: $condition";
        return FALSE;
    }

    return TRUE;
}

sub _callback_quit {
    my ( $window, $event, $self ) = @_;

    if ( $self->{child_running} ) {
        kill "TERM", $self->{child_pid};
    }

    Gtk2->main_quit();
}

###############################################################################
# --------------------------------------------------------------------------- #
###############################################################################

package TestRunner;

use TAP::Parser;
use TAP::Parser::Source::Perl;

use constant {
    INDEX_TOTAL => 0,
    INDEX_RUN   => 1,
    INDEX_PASS  => 2,
    INDEX_FAIL  => 3,
    INDEX_SKIP  => 4,
    INDEX_TODO  => 5,
};

sub new {
    my ( $class, $writer ) = @_;

    my $self = bless {}, $class;

    $self->{_writer} = $writer;

    return $self;
}

sub add_tests {
    my ( $self, @tests ) = @_;

    $self->{_tests} = [@tests];

    $self->{_results} = {};
    foreach my $test ( @{ $self->{_tests} } ) {
        $self->{_results}->{$test} = [ 0, 0, 0, 0, 0, 0 ];
    }
}

sub run {
    my ($self) = @_;

    my $source = TAP::Parser::Source::Perl->new();

    foreach my $test ( @{ $self->{_tests} } ) {
        my $parser = TAP::Parser->new( { source => $test } );
        $self->analyze( $test, $parser ) if $parser;
    }

    my $writer = $self->{_writer};
    $writer->flush();
    $writer->print("\n");
}

sub analyze {
    my ( $self, $test, $parser ) = @_;

    my $writer = $self->{_writer};
    my $result = $self->{_results}->{$test};

    while ( my $line = $parser->next() ) {
        if ( $line->is_plan() ) {
            $result->[INDEX_TOTAL] = $line->tests_planned();
        }

        elsif ( $line->is_test() ) {
            $result->[INDEX_RUN]++;

            if ( $line->has_skip() ) {
                $result->[INDEX_SKIP]++;
                next;
            }

            if ( $line->has_todo() ) {
                $result->[INDEX_TODO]++;
            }

            if ( $line->is_ok() ) {
                $result->[INDEX_PASS]++;
            }
            else {
                $result->[INDEX_FAIL]++;
            }
        }

        elsif ( $line->is_comment() ) {

            # ignore
        }

        else {
            warn "Unknown result type `"
              . $line->type() . "´: "
              . $line->as_string();
        }

        my $string = join "\t", $test, @{$result};
        $writer->print("$string\n");
    }

    return $parser;
}