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#!perl
use strict;
use Cwd ();
use inc::Devel::CheckLib;
use ExtUtils::MakeMaker;
use File::Spec;

my $CURDIR = Cwd::cwd();

# Here's the file that we're going to use to extract some data
my $SPEC_FILE       = 'lib/Alien/MeCab.pm';

# Check for hellish-ness
my $RUNNING_IN_HELL = $^O eq 'MSWin32';

# Get the version 
my $DIST_VERSION  = do {
    require ExtUtils::MM_Unix;
    ExtUtils::MM_Unix->parse_version($SPEC_FILE);
};

# Actual mecab version. This is the number up to the second fractional digit
# of the dist version
my $MECAB_VERSION    = substr($DIST_VERSION, 0, 4);

# Filenames 
my $MECAB_SOURCE_DIR = File::Spec->catfile("src", "mecab-$MECAB_VERSION");
my $MECAB_BASENAME   = "mecab-$MECAB_VERSION.tar.gz";
my $MECAB_SOURCE     = File::Spec->catfile("src", $MECAB_BASENAME);
my $MECAB_EXE        = File::Spec->catfile("src", "mecab-$MECAB_VERSION.exe");

# Absolut-ize all paths
$MECAB_SOURCE_DIR    = File::Spec->rel2abs($MECAB_SOURCE_DIR);
$MECAB_SOURCE        = File::Spec->rel2abs($MECAB_SOURCE);
$MECAB_EXE           = File::Spec->rel2abs($MECAB_EXE);

my %REQUIRES;

# Construct the necessary flags
my $CCFLAGS = $ENV{CCFLAGS};
my $LDFLAGS = $ENV{LDFLAGS};
if (! $RUNNING_IN_HELL) {
    $CCFLAGS ||= '-I/usr/local/include';
    $LDFLAGS ||= '-L/usr/local/lib';
}

if (! $RUNNING_IN_HELL) {
    eval {
        Devel::CheckLib::assert_lib(lib => "iconv", LIBS => $LDFLAGS);
    };
    if ($@) {
        print <<EOM;

*** Whoa! libiconv was not detected! ***

MeCab requires libiconv to work properly. You can either 
    (1) install it yourself by hand, or
    (2) install it via Alien::Iconv
EOM

        my $yn = prompt("Would you like to add Alien::Iconv to prerequisite modules?", "y");
        if ($yn !~ /^y(?:es)?$/) {
            print <<EOM;

You chose not to install libiconv. Please install it manually and
re-run perl Makefile.PL for Alien::MeCab.

EOM
            exit 0;
        }

        $REQUIRES{ 'Alien::MeCab' } = '1.12001';
    }
}

eval {
    Devel::CheckLib::assert_lib(lib => "mecab", LIBS => $LDFLAGS )
};
if (! $@) {
    print <<EOM;

*** Whoa!  We've detected a previous installtion of libmecab ***

Because Alien::MeCab may have been called to be installed from a dependency
of another module, we want to make sure that you *really* want to install
this version of Alien::MeCab (and therefore libmecab).

If you answer "y", then We're going to install
    libmecab: $MECAB_VERSION

This operation may OVERWRITE your previous installation
EOM
    my $yn = prompt("Really install?", "n");
    if ($yn !~ /^y(?:es)?$/) {
        exit 0;
    }
}

# Ask if we want to download the source.