#!/usr/bin/perl -w

use strict;
use warnings;

use Devel::CheckLib;
use ExtUtils::CppGuess;
use Module::Build::WithXSpp;

my $cpp_guess = ExtUtils::CppGuess->new;
my $mswin = $^O eq 'MSWin32';

# _GLIBCXX_USE_C99 : to get the long long type for g++
# HAS_BOOL         : stops Perl/lib/CORE/handy.h from doing "#  define bool char" for MSVC
# NOGDI            : prevents inclusion of wingdi.h which defines functions Polygon() and Polyline() in global namespace
# BOOST_ASIO_DISABLE_KQUEUE : prevents a Boost ASIO bug on OS X: https://svn.boost.org/trac/boost/ticket/5339
my @cflags = qw(-D_GLIBCXX_USE_C99 -DHAS_BOOL -DNOGDI -DSLIC3RXS -DBOOST_ASIO_DISABLE_KQUEUE);
my @ldflags = ();
if ($^O eq 'darwin') {
    push @ldflags, qw(-framework IOKit -framework CoreFoundation);
}
if ($mswin) {
    # In case windows.h is included, we don't want the min / max macros to be active.
    # If <math.h> is included, we want the #defines to be active (M_PI etc.)
    push @cflags, qw(-DNOMINMAX -D_USE_MATH_DEFINES);
}

my @INC  = qw(-Isrc/libslic3r);
my @LIBS = $cpp_guess->is_msvc ? qw(-LIBPATH:src/libslic3r) : qw(-Lsrc/libslic3r);

# search for Boost in a number of places
my @boost_include = ();
if (defined $ENV{BOOST_INCLUDEDIR}) {
    push @boost_include, $ENV{BOOST_INCLUDEDIR}
} elsif (defined $ENV{BOOST_DIR}) {
    my $subdir = $ENV{BOOST_DIR} . (($mswin == 1) ? '\include' : '/include');
    if (-d $subdir) {
        push @boost_include, $subdir;
    } else {
        push @boost_include, $ENV{BOOST_DIR};
    }
} else {
    # Boost library was not defined by the environment.
    # Try to guess at some default paths.
    if ($mswin) {
        for my $path (glob('C:\dev\boost*\include'), glob ('C:\boost*\include')) {
            push @boost_include, $path;
        }
        if (! @boost_include) {
            # No boost\include. Try to include the boost root.
            for my $path (glob('C:\dev\boost*'), glob ('C:\boost*')) {
                push @boost_include, $path;
            }
        }
    } else {
        push @boost_include, grep { -d $_ }
            qw(/opt/local/include /usr/local/include /opt/include /usr/include);
    }
}

my @boost_libs = ();
if (defined $ENV{BOOST_LIBRARYDIR}) {
    push @boost_libs, $ENV{BOOST_LIBRARYDIR}
} elsif (defined $ENV{BOOST_DIR}) {
    my $subdir = $ENV{BOOST_DIR} . ($mswin ? '\stage\lib' : '/stage/lib');
    if (-d $subdir) {
        push @boost_libs, $subdir;
    } else {
        push @boost_libs, $ENV{BOOST_DIR};
    }
} else {
    # Boost library was not defined by the environment.
    # Try to guess at some default paths.
    if ($mswin) {
        for my $path (
            glob('C:\dev\boost*\lib'),       glob ('C:\boost*\lib'), 
            glob('C:\dev\boost*\stage\lib'), glob ('C:\boost*\stage\lib')) {
            push @boost_libs, $path;
        }
    } else {
        push @boost_libs, grep { -d $_ }
            qw(/opt/local/lib /usr/local/lib /opt/lib /usr/lib /lib);
    }
}

# In order to generate the -l switches we need to know how Boost libraries are named
my $have_boost = 0;
my @boost_libraries = qw(system thread);  # we need these

# check without explicit lib path (works on Linux)
if (! $mswin) {
    $have_boost = 1
        if check_lib(
            lib     => [ map "boost_${_}", @boost_libraries ],
        );
}

if (!$ENV{SLIC3R_STATIC} && $have_boost) {
    # The boost library was detected by check_lib on Linux.
    push @LIBS, map "-lboost_${_}", @boost_libraries;
} else {
    # Either static linking, or check_lib could not be used to find the boost libraries.
    my $lib_prefix = 'libboost_';
    my $lib_ext = ${$cpp_guess}{config}{lib_ext};
    PATH: foreach my $path (@boost_libs) {
        # Try to find the boost system library.
        my @files = glob "$path/${lib_prefix}system*$lib_ext";
        next if !@files;
    
        if ($files[0] =~ /${lib_prefix}system([^.]+)$lib_ext$/) {
            # Suffix contains the version number, the build type etc.
            my $suffix = $1;
            # Verify existence of all required boost libraries at $path.
            for my $lib (map "${lib_prefix}${_}${suffix}${lib_ext}", @boost_libraries) {
                # If the library file does not exist, try next library path.
                -f "$path/$lib" or next PATH;
            }
            if (! $cpp_guess->is_msvc) {
                # Test the correctness of boost libraries by linking them to a minimal C program.
                check_lib(
                    lib     => [ map "boost_${_}${suffix}", @boost_libraries ],
                    INC     => join(' ', map "-I$_", @INC,  @boost_include),
                    LIBS    => "-L$path",
                ) or next;
            }
            push @INC, (map " -I$_", @boost_include);  # TODO: only use the one related to the chosen lib path
            if ($ENV{SLIC3R_STATIC} || $cpp_guess->is_msvc) {
                push @LIBS, map "${path}/${lib_prefix}$_${suffix}${lib_ext}", @boost_libraries;
            } else {
                push @LIBS, " -L$path", (map " -lboost_$_$suffix", @boost_libraries);
            }
            $have_boost = 1;
            last;
        }
    }
}
push @cflags, '-DBOOST_LIBS' if $have_boost;
die <<'EOF' if !$have_boost;
Slic3r requires the Boost libraries. Please make sure they are installed.

If they are installed, this script should be able to locate them in several
standard locations. If this is not the case, you might want to supply their 
path through the BOOST_DIR environment variable:

    BOOST_DIR=/path/to/boost perl Build.PL

Or you may specify BOOST_INCLUDEPATH and BOOST_LIBRARYPATH separatly, which
is handy, if you have built Boost libraries with mutliple settings.

EOF

if ($ENV{SLIC3R_DEBUG}) {
    # only on newer GCCs: -ftemplate-backtrace-limit=0
    push @cflags, '-DSLIC3R_DEBUG';
    push @cflags, $cpp_guess->is_msvc ? '-Gd' : '-g';
}
if ($cpp_guess->is_gcc) {
    # check whether we're dealing with a buggy GCC version
    # see https://github.com/alexrj/Slic3r/issues/1965
    if (`cc --version` =~ / 4\.7\.[012]/) {
        # Workaround suggested by Boost devs:
        # https://svn.boost.org/trac/boost/ticket/8695
        push @cflags, qw(-fno-inline-small-functions);
    }
}

my $build = Module::Build::WithXSpp->new(
    module_name     => 'Slic3r::XS',
    dist_abstract   => 'XS code for Slic3r',
    build_requires => {qw(
        ExtUtils::ParseXS           3.18
        ExtUtils::Typemaps          1.00
        ExtUtils::Typemaps::Default 1.05
        ExtUtils::XSpp              0.17
        Module::Build               0.3601
        Test::More                  0
    )},
    configure_requires => {qw(
        ExtUtils::CppGuess          0.07
        Module::Build               0.38
        Module::Build::WithXSpp     0.13
    )},
    extra_compiler_flags => [ @INC, @cflags ],
    extra_linker_flags => [ @LIBS, @ldflags ],
    
    # Provides extra C typemaps that are auto-merged
    extra_typemap_modules => {
        'ExtUtils::Typemaps::Basic' => '1.05',
    },
    
    # for MSVC builds
    early_includes => [qw(
        cstring
        cstdlib
        ostream
        sstream
        libslic3r/GCodeSender.hpp
    )]
);

$build->create_build_script;

__END__