#!/usr/bin/env perl

$tagsets = "tagsets";

$version = "";
$build = 0;
my %force;   # Names of module to force build
@tARGV = ();
for (; @ARGV > 0; ) {
    if ($ARGV[0] eq "-version") {
        $version = $ARGV[1];
        shift; shift; next;
    }
    if ($ARGV[0] eq "-build") {
        $build = 1;
        shift; next;
    }
    if ($ARGV[0] eq "-force") {
        $force{$ARGV[1]} = 1;
        shift; shift; next;
    }
    if ($ARGV[0] eq "-path")  { &list_include_path (); }
    if ($ARGV[0] eq "-h")     { &usage (); }
    if ($ARGV[0] eq "help")   { &usage (); }
    if ($ARGV[0] eq "-help")  { &usage (); }
    if ($ARGV[0] eq "--help") { &usage (); }
    if ($ARGV[0] eq "-list")  { &list_distributions(); }
    @tARGV = (@tARGV, $ARGV[0]);
    shift;
}
@ARGV = @tARGV;
if ( @ARGV > 1) { &usage(); }

if ( @ARGV == 0) {
    @list = <$tagsets/*.perl>;
    $file = $list[-1];
} else {
    $file = "$tagsets/$ARGV[0].perl";
}
print "examining perl modules based on $file\n";

# load the perl module list
open (FILE, $file) || die "ERROR: can't open perl module list: $file\n";
@list = <FILE>;
close (FILE);

# set the psconfig version:
if ("$version" eq "") {
    $version = $ENV{'PSVERSION'};
}
if ("$version" eq "") {
    $version = "default";
}

# generate new psconfig.csh if needed
if (! -e "psconfig.csh" || ! -e "psconfig.bash") {
    $psconfdir = $ENV{'PSCONFDIR'};
    if ($psconfdir eq "") { die "PSCONFDIR not found, run psbuild -bootstrap and follow instructions\n"; }
    vsystem ("cat psconfig.csh.in | sed 's|\@PSCONFDIR@|$psconfdir|' > psconfig.csh");
    vsystem ("cat psconfig.bash.in | sed 's|\@PSCONFDIR@|$psconfdir|' > psconfig.bash");
}

$prefix  = `csh -f psconfig.csh --prefix $version`; chomp $prefix;
$perldir = `csh -f psconfig.csh --perldir $version`; chomp $perldir;
$homedir = `pwd`; chomp $homedir;

# Astro::FITS::CFITSIO requires this to be set correctly...
$ENV{'CFITSIO'} = $prefix;

print "psconfig version: $version\n";
print "prefix: $prefix\n";
print "perldir: $perldir\n";
print "PERL5LIB: $ENV{'PERL5LIB'}\n";
$psconfdir = $ENV{'PSCONFDIR'};

if ($build && ! -d $psconfdir) {
    mkdir $psconfdir || die "unable to create psconfig dir $psconfdir";
}

$Nmissing = 0;
@missing = ();
foreach $line (@list) {
    chop $line;
    if ($line =~ m|^\s*$|) { next; }
    if ($line =~ m|^\s*\#|) { next; }

    $Nvalue = ($N, $module, $tarball, $modver, $buildopts, $prompts) = split (" ", $line);
    if ($Nvalue < 6) {
        print "Error in perl module config line $line\n";
        exit 1;
    }
    # print "N: $N, module: $module, tarball: $tarball, modver: $modver, buildopts: $buildopts, prompts: $prompts\n";

    # we require the number of fields to be fixed, so this test is now invalid:
    # if ($modver eq "") { $modver = 0; }

    system ("pscheckmods $module $modver");
    if (($? == 0) and not defined $force{$module} and not defined $force{'all'}) {
        # print "$module: found\n";
        next;
    }

    if (defined $force{$module}) {
        print "$module: force\n";
    } else {
        print "$module: missing\n";
    }
    unless ($build or defined $force{$module} or defined $force{'all'}) {
        $Nmissing ++;
        push @missing, $module;
        next;
    }

    # try to build the module from ../extperl/Module.*.tar.gz
    chdir "../extperl" or die "Unable to find ../extperl directory.";

    print "extract $module from $tarball\n";
    vsystem ("tar xvzf $tarball");

    ($tardir) = $tarball =~ m|(\S*).tar.gz|;
    print "tardir: $tardir\n";

    chdir $tardir;

    # we use NONE as the empty word
    if ($buildopts eq "NONE") { $buildopts = ""; }
    if ($prompts eq "NONE") { $prompts = ""; }

    if (-e "Build.PL" and $module ne "Params::Validate" and $module ne "DateTime::TimeZone") {
        # vsystem("perl Build.PL --install_path lib=$perldir ");
        vsystem("perl Build.PL --install_base $prefix $buildopts");
        vsystem("Build");
        vsystem("Build install");
    } else {
        # build the MakeMaker makefile, setting the output directories
        if ($prompts) {
            @answers = split (",", $prompts);
            open (PIPE, "|perl Makefile.PL PREFIX=$prefix LIB=$perldir $buildopts");
            foreach $answer (@answers) {
                print PIPE "$answer\n";
            }
            close (PIPE);
        } else {
            vsystem ("perl Makefile.PL PREFIX=$prefix LIB=$perldir $buildopts");
        }
        vsystem ("make < /dev/null");
        vsystem ("make install");
    }

    chdir $homedir;
}
if (!$build) {
    if ($Nmissing > 0) {
        print "The following $Nmissing perl modules are missing from your system\n";
        foreach $name (@missing) {
            print "  $name\n";
        }
        print "you may install them in your local path by re-running pscheckperl with -build\n";
    } else {
        print "no perl modules are missing from your system\n";
    }
}
exit 0;

sub usage {
    print STDERR "USAGE: pscheckperl [-version] [-build] [-path]\n";
    exit 2;
}

sub vsystem {
    print STDERR "@_\n";
    $status = system ("@_");
    $status;
}

sub list_distributions {
    @list = <$tagsets/*.perl>;
    foreach $line (@list) {
        chomp $line;
        ($dist) = $line =~ m|$tagsets/(\S*).perl|;
        print STDERR "$dist\n";
    }
    exit 2;
}

sub list_include_path {
    foreach $path (@INC) {
        print STDERR "$path\n";
    }
    exit 2;
}
