# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

use strict;
use warnings;

package Lucy::Build;
use base qw(
    Clownfish::CFC::Perl::Build
    Clownfish::CFC::Perl::Build::Charmonic
);

our $VERSION = '0.004000';
$VERSION = eval $VERSION;

use File::Spec::Functions qw( catdir catfile rel2abs );
use File::Path qw( rmtree );
use File::Copy qw( move );
use Config;
use Carp;
use Cwd qw( getcwd );

my @BASE_PATH = __PACKAGE__->cf_base_path;

my $COMMON_SOURCE_DIR = catdir( @BASE_PATH, 'common' );
my $LEMON_DIR         = catdir( @BASE_PATH, 'lemon' );
my $LEMON_EXE_PATH = catfile( $LEMON_DIR, "lemon$Config{_exe}" );
my $CORE_SOURCE_DIR = catdir( @BASE_PATH, 'core' );
my $LIB_DIR         = 'lib';
my $IS_CPAN_DIST    = !@BASE_PATH;
my $CHARMONIZER_C;
if ($IS_CPAN_DIST) {
    $CHARMONIZER_C = 'charmonizer.c';
}
else {
    $CHARMONIZER_C = catfile( $COMMON_SOURCE_DIR, 'charmonizer.c' );
}

sub new {
    my $self = shift->SUPER::new( recursive_test_files => 1, @_ );

    # Fix for MSVC: Although the generated XS should be C89-compliant, it
    # must be compiled in C++ mode like the rest of the code due to a
    # mismatch between the sizes of the C++ bool type and the emulated bool
    # type. (The XS code is compiled with Module::Build's extra compiler
    # flags, not the Clownfish cflags.)
    if ($Config{cc} =~ /^cl\b/) {
        my $extra_cflags = $self->extra_compiler_flags;
        push @$extra_cflags, '/TP';
        $self->extra_compiler_flags(@$extra_cflags);
    }

    if ( $ENV{LUCY_VALGRIND} ) {
        my $optimize = $self->config('optimize') || '';
        $optimize =~ s/\-O\d+/-O1/g;
        $self->config( optimize => $optimize );
    }

    $self->charmonizer_params( charmonizer_c => $CHARMONIZER_C );

    $self->clownfish_params( autogen_header => $self->autogen_header );

    return $self;
}

sub _run_make {
    my ( $self, %params ) = @_;
    my @command           = @{ $params{args} };
    my $dir               = $params{dir};
    my $current_directory = getcwd();
    chdir $dir if $dir;
    unshift @command, 'CC=' . $self->config('cc');
    if ( $self->config('cc') =~ /^cl\b/ ) {
        unshift @command, "-f", "Makefile.MSVC";
    }
    elsif ( $^O =~ /mswin/i ) {
        unshift @command, "-f", "Makefile.MinGW";
    }
    unshift @command, "$Config{make}";
    system(@command) and confess("$Config{make} failed");
    chdir $current_directory if $dir;
}

# Build the Lemon parser generator.
sub ACTION_lemon {
    my $self = shift;
    print "Building the Lemon parser generator...\n\n";
    $self->_run_make(
        dir  => $LEMON_DIR,
        args => [],
    );
}

sub ACTION_copy_clownfish_includes {
    my $self = shift;

    $self->SUPER::ACTION_copy_clownfish_includes;

    $self->cf_copy_include_file( qw( Lucy Util ToolSet.h ) );
}

sub _valgrind_base_command {
    return
          "PERL_DESTRUCT_LEVEL=2 LUCY_VALGRIND=1 valgrind "
        . "--leak-check=yes "
        . "--show-reachable=yes "
        . "--dsymutil=yes "
        . "--suppressions=../devel/conf/lucyperl.supp ";
}

# Run the entire test suite under Valgrind.
#
# For this to work, Lucy must be compiled with the LUCY_VALGRIND environment
# variable set to a true value, under a debugging Perl.
#
# A custom suppressions file will probably be needed -- use your judgment.
# To pass in one or more local suppressions files, provide a comma separated
# list like so:
#
#   $ ./Build test_valgrind --suppressions=foo.supp,bar.supp
sub ACTION_test_valgrind {
    my $self = shift;
    # Debian's debugperl uses the Config.pm of the standard system perl
    # so -DDEBUGGING won't be detected.
    die "Must be run under a perl that was compiled with -DDEBUGGING"
        unless $self->config('ccflags') =~ /-D?DEBUGGING\b/
               || $^X =~ /\bdebugperl\b/;
    if ( !$ENV{LUCY_VALGRIND} ) {
        warn "\$ENV{LUCY_VALGRIND} not true -- possible false positives";
    }
    $self->depends_on('code');

    # Unbuffer STDOUT, grab test file names.
    $|++;
    my $t_files = $self->find_test_files;    # not public M::B API, may fail
    my $valgrind_command = $self->_valgrind_base_command;

    if ( my $local_supp = $self->args('suppressions') ) {
        for my $supp ( split( ',', $local_supp ) ) {
            $valgrind_command .= "--suppressions=$supp ";
        }
    }

    # Iterate over test files.
    my @failed;
    for my $t_file (@$t_files) {

        # Run test file under Valgrind.
        print "Testing $t_file...";
        die "Can't find '$t_file'" unless -f $t_file;
        my $command = "$valgrind_command $^X -Mblib $t_file 2>&1";
        my $output = "\n" . ( scalar localtime(time) ) . "\n$command\n";
        $output .= `$command`;

        # Screen-scrape Valgrind output, looking for errors and leaks.
        if (   $?
            or $output =~ /ERROR SUMMARY:\s+[^0\s]/
            or $output =~ /definitely lost:\s+[^0\s]/
            or $output =~ /possibly lost:\s+[^0\s]/
            or $output =~ /still reachable:\s+[^0\s]/ )
        {
            print " failed.\n";
            push @failed, $t_file;
            print "$output\n";
        }
        else {
            print " succeeded.\n";
        }
    }

    # If there are failed tests, print a summary list.
    if (@failed) {
        print "\nFailed "
            . scalar @failed . "/"
            . scalar @$t_files
            . " test files:\n    "
            . join( "\n    ", @failed ) . "\n";
        exit(1);
    }
}

# Run all .y files through lemon.
sub ACTION_parsers {
    my $self = shift;
    $self->depends_on('lemon');
    my $y_files = $self->rscan_dir( $CORE_SOURCE_DIR, qr/\.y$/ );
    for my $y_file (@$y_files) {
        my $c_file = $y_file;
        my $h_file = $y_file;
        $c_file =~ s/\.y$/.c/ or die "no match";
        $h_file =~ s/\.y$/.h/ or die "no match";
        next if $self->up_to_date( $y_file, [ $c_file, $h_file ] );
        $self->add_to_cleanup( $c_file, $h_file );
        system( $LEMON_EXE_PATH, '-q', $y_file ) and die "lemon failed";
    }
}

sub ACTION_compile_custom_xs {
    my $self = shift;

    $self->depends_on(qw( parsers charmony ));

    # Add extra compiler flags from Charmonizer.
    my $charm_cflags = $self->charmony('EXTRA_CFLAGS');
    if ($charm_cflags) {
        my $cf_cflags = $self->clownfish_params('cflags');
        if ($cf_cflags) {
            $cf_cflags .= " $charm_cflags";
        }
        else {
            $cf_cflags = $charm_cflags;
        }
        $self->clownfish_params( cflags => $cf_cflags );
    }

    $self->SUPER::ACTION_compile_custom_xs;
}

sub autogen_header {
    my $self = shift;
    return <<"END_AUTOGEN";
/***********************************************

 !!!! DO NOT EDIT !!!!

 This file was auto-generated by Build.PL.

 ***********************************************/

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

END_AUTOGEN
}

sub _check_module_build_for_dist {
    eval "use Module::Build 0.38;";
    die "./Build dist reqiures Module::Build 0.38 or higher--this is only "
        . Module::Build->VERSION . $/ if $@;
}

sub ACTION_distdir {
    _check_module_build_for_dist;
    shift->SUPER::ACTION_distdir(@_);
}

sub ACTION_dist {
    my $self = shift;
    _check_module_build_for_dist;

    # Create POD.
    $self->depends_on('pod');
    rmtree("autogen");

    # We build our Perl release tarball from $REPOS_ROOT/perl, rather than
    # from the top-level.
    #
    # Because some items we need are outside this directory, we need to copy a
    # bunch of stuff.  After the tarball is packaged up, we delete the copied
    # directories.
    my %to_copy = (
        '../core'         => 'core',
        '../modules'      => 'modules',
        '../devel'        => 'devel',
        '../lemon'        => 'lemon',
        '../CHANGES'      => 'CHANGES',
        '../CONTRIBUTING' => 'CONTRIBUTING',
        '../LICENSE'      => 'LICENSE',
        '../NOTICE'       => 'NOTICE',
        '../README'       => 'README',
        $CHARMONIZER_C    => 'charmonizer.c',
    );
    print "Copying files...\n";
    while (my ($from, $to) = each %to_copy) {
        confess("'$to' already exists") if -e $to;
        system("cp -R $from $to") and confess();
    }

    move( "MANIFEST", "MANIFEST.bak" ) or die "move() failed: $!";
    $self->depends_on('manifest');
    my $no_index = $self->_gen_pause_exclusion_list;
    my $meta_add = $self->meta_add || {};
    $meta_add->{no_index} = $no_index;
    $self->meta_add( $meta_add );
    $self->SUPER::ACTION_dist;

    # Clean up.
    print "Removing copied files...\n";
    rmtree($_) for values %to_copy;
    unlink("META.yml");
    unlink("META.json");
    move( "MANIFEST.bak", "MANIFEST" ) or die "move() failed: $!";
}

sub ACTION_distmeta {
    my $self = shift;
    $self->SUPER::ACTION_distmeta(@_);
    # Make sure everything has a version.
    require CPAN::Meta;
    my $v = version->new($self->dist_version);
    my $meta = CPAN::Meta->load_file('META.json');
    my $provides = $meta->provides;
    while (my ($pkg, $data) = each %{ $provides }) {
        die "$pkg, defined in $data->{file}, has no version\n"
            unless $data->{version};
        die "$pkg, defined in $data->{file}, is "
            . version->new($data->{version})->normal
            . " but should be " . $v->normal . "\n"
            unless $data->{version} == $v;
    }
}

# Generate a list of files for PAUSE, search.cpan.org, etc to ignore.
sub _gen_pause_exclusion_list {
    my $self = shift;

    # Only exclude files that are actually on-board.
    open( my $man_fh, '<', 'MANIFEST' ) or die "Can't open MANIFEST: $!";
    my @manifest_entries = <$man_fh>;
    chomp @manifest_entries;

    my @excluded_files;
    for my $entry (@manifest_entries) {
        # Allow README and Changes.
        next if $entry =~ m#^(README|Changes)#;

        # Allow public modules.
        if ( $entry =~ m#^(perl/)?lib\b.+\.(pm|pod)$# ) {
            open( my $fh, '<', $entry ) or die "Can't open '$entry': $!";
            my $content = do { local $/; <$fh> };
            next if $content =~ /=head1\s*NAME/;
        }

        # Disallow everything else.
        push @excluded_files, $entry;
    }

    # Exclude redacted modules.
    if ( eval { require "buildlib/Lucy/Redacted.pm" } ) {
        my @redacted = map {
            my @parts = split( /\W+/, $_ );
            catfile( $LIB_DIR, @parts ) . '.pm'
        } Lucy::Redacted->redacted, Lucy::Redacted->hidden;
        push @excluded_files, @redacted;
    }

    my %uniquifier;
    @excluded_files = sort grep { !$uniquifier{$_}++ } @excluded_files;
    return { file => \@excluded_files };
}

sub ACTION_semiclean {
    my $self = shift;
    print "Cleaning up most build files.\n";
    my @candidates
        = grep { $_ !~ /(charmonizer|^_charm|charmony|charmonize|snowstem)/ }
        $self->cleanup;
    for my $path ( map { glob($_) } @candidates ) {
        next unless -e $path;
        rmtree($path);
        confess("Failed to remove '$path'") if -e $path;
    }
}

sub ACTION_clean {
    my $self = shift;
    $self->_run_make( dir => $LEMON_DIR, args => ['clean'] );
    $self->SUPER::ACTION_clean;
}

1;

__END__