# Makefile.PL - Makefile generator
#
# Copyright (C) 2016  Libiquity LLC
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use warnings;

use ExtUtils::MakeMaker;

my %mm_args;

sub parse_use
{
	my ($file) = @_;
	my $fh;
	my $line;
	my $prereqs = {};

	open($fh, "<", $file);
	while ($line = readline($fh)) {
		chomp($line);
		if ($line =~ s|^use ([A-Z][A-Za-z0-9_:]*) *.*;$|$1|) {
			if ($line =~ m/^Math::FastPPDecimal/) {
			} else {
				%$prereqs = (%$prereqs, $line => 0);
			}
		}
	}
	close($fh);

	return $prereqs;
}

sub find_prereqs
{
	my ($file_pattern) = @_;
	my $manifest_fh;
	my $file;
	my $prereqs = {};

	open($manifest_fh, "<", "MANIFEST");
	while ($file = readline($manifest_fh)) {
		chomp($file);
		if ($file =~ $file_pattern) {
			$file = parse_use($file);
			%$prereqs = (%$prereqs, %$file);
		}
	}
	close($manifest_fh);

	return $prereqs;
}

%mm_args = (
	"NAME" => "Math::Decimal::FastPP",
	"VERSION" => "0.001",
	"AUTHOR" => "Patrick McDermott <patrick.mcdermott\@libiquity.com>",
	"LICENSE" => "gpl_3",
	"CONFIGURE_REQUIRES" => {
		"ExtUtils::MakeMaker" => 0,
	},
	"PREREQ_PM" => find_prereqs(qr{^(bin|lib)/}),
);

if (eval {ExtUtils::MakeMaker->VERSION("6.46");}) {
	$mm_args{"META_MERGE"} = {
		"meta-spec" => { version => 2 },
		"resources" => {
			"homepage" => "http://www.pehjota.net/projects/decmath/",
			"repository" => {
				"type" => "git",
				"url" => "git://git.pehjota.net/decmath/Math-Decimal-FastPP.git",
				"web" => "http://git.pehjota.net/decmath/Math-Decimal-FastPP.git/",
			},
		},
	};
}

if (eval {ExtUtils::MakeMaker->VERSION("6.64");}) {
	# 6.64 <= MM
	$mm_args{"TEST_REQUIRES"} = find_prereqs(qr{^t/});
} elsif (eval {ExtUtils::MakeMaker->VERSION("6.5503");}) {
	# 6.5503 <= MM < 6.64
	$mm_args{"BUILD_REQUIRES"} = find_prereqs(qr{^t/});
} else {
	# MM < 6.5503
	$mm_args{"PREREQ_PM"} = {
		$mm_args{"PREREQ_PM"},
		find_prereqs(qr{^t/}),
	};
}

WriteMakefile(
	%mm_args
);