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package My::Build;

use warnings FATAL => 'all';
use strict;

use Archive::Tar;
use Cwd qw/realpath/;
use Digest::SHA qw/sha1_hex/;
use File::Path qw/remove_tree/;
use File::Spec::Functions qw/catdir catfile/;
use IPC::Run qw/run/;
use LWP::Simple qw/getstore RC_OK/;
use Module::Build;

use base 'Module::Build';

sub ACTION_code {
    my $self = shift;

    $self->SUPER::ACTION_code;

    return if -e 'build-zeromq';
    $self->add_to_cleanup('build-zeromq');

    my %args = $self->args;
    my %vars;

    $self->have_c_compiler or die "C compiler not found";

    unless (exists $args{'zmq-skip-probe'}) {
        print "Probing...\n";
        %vars = $self->probe_zeromq;
    }

    if ($vars{inc_version} && $vars{lib_version} && $vars{inc_dir} && $vars{lib_dir}) {
        print "Found libzmq $vars{lib_version}; skipping installation\n";
    } else {
        print "libzmq not found; building from source...\n";
        %vars = $self->install_zeromq;
    }

    # write vars to ZMQ.pm
    my $module = catfile qw/blib lib Alien ZMQ.pm/;
    open my $LIB, '<', $module or die "Cannot read module";
    my $lib = do { local $/; <$LIB> };
    close $LIB;
    $lib =~ s/^sub inc_dir.*$/sub inc_dir { "$vars{inc_dir}" }/m;
    $lib =~ s/^sub lib_dir.*$/sub lib_dir { "$vars{lib_dir}" }/m;
    $lib =~ s/^sub inc_version.*$/sub inc_version { v$vars{inc_version} }/m;
    $lib =~ s/^sub lib_version.*$/sub lib_version { v$vars{lib_version} }/m;
    my @stats = stat $module;
    chmod 0644, $module;
    open $LIB, '>', $module or die "Cannot write config to module";
    print $LIB $lib;
    close $LIB;
    chmod $stats[2], $module;

    open my $TARGET, '>', "build-zeromq";
    print $TARGET time, "\n";
    close $TARGET;
}

sub probe_zeromq {
    my $self = shift;
    my $cb = $self->cbuilder;
    my %config = $cb->get_config;

    my $src = "test-$$.c";
    open my $SRC, '>', $src;
    print $SRC <<END;
#include <stdio.h>
#include <zmq.h>
int main(int argc, char* argv[]) {
    int major, minor, patch;
    zmq_version(&major, &minor, &patch);
    printf("%d.%d.%d %d.%d.%d",
        ZMQ_VERSION_MAJOR, ZMQ_VERSION_MINOR, ZMQ_VERSION_PATCH,
        major, minor, patch);
    return 0;
}
END
    close $SRC;

    my @inc_search;
    my @lib_search;

    my $cflags = $self->args('zmq-cflags');
    my $libs   = $self->args('zmq-libs');

    my $pkg_version;

    my $pkg_config = $ENV{PKG_CONFIG_COMMAND} || "pkg-config";
    for my $pkg (qw/libzmq zeromq3/) {
        $pkg_version = `$pkg_config $pkg --modversion`;
        chomp $pkg_version;
        next unless $pkg_version;

        $cflags ||= `$pkg_config $pkg --cflags`;
        $libs   ||= `$pkg_config $pkg --libs`;

        # use -I and -L flag arguments as extra search directories
        my $inc = `$pkg_config $pkg --cflags-only-I`;
        push @inc_search, map { s/^-I//; $_ } $cb->split_like_shell($inc);
        my $lib = `$pkg_config $pkg --libs-only-L`;
        push @lib_search, map { s/^-L//; $_ } $cb->split_like_shell($lib);

        last;
    }

    my $obj = eval {
        $cb->compile(source => $src, include_dirs => [@inc_search], extra_compiler_flags => $cflags);
    };
    unlink $src;
    return unless $obj;

    my $exe = eval {