#!/usr/bin/perl
#############################################################################
##
## Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
## Contact: http://www.qt-project.org/
##
## This file is part of the build configuration tools of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:LGPL$
## GNU Lesser General Public License Usage
## This file may be used under the terms of the GNU Lesser General Public
## License version 2.1 as published by the Free Software Foundation and
## appearing in the file LICENSE.LGPL included in the packaging of this
## file. Please review the following information to ensure the GNU Lesser
## General Public License version 2.1 requirements will be met:
## http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
##
## In addition, as a special exception, Nokia gives you certain additional
## rights. These rights are described in the Nokia Qt LGPL Exception
## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU General
## Public License version 3.0 as published by the Free Software Foundation
## and appearing in the file LICENSE.GPL included in the packaging of this
## file. Please review the following information to ensure the GNU General
## Public License version 3.0 requirements will be met:
## http://www.gnu.org/copyleft/gpl.html.
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## Other Usage
## Alternatively, this file may be used in accordance with the terms and
## conditions contained in a signed written agreement between you and Nokia.
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## $QT_END_LICENSE$
##
#############################################################################

#
# Runs any module configuration tests
#
# Called (currently) from syncqt, and expects a few arguments
#
# configtests $basedir $out_basedir $qtbasedir $quietmode
#

use strict;
use warnings;

# use packages -------------------------------------------------------
use File::Basename;
use File::Path 'mkpath';
use File::Spec::Functions;
use Cwd;
use Cwd 'abs_path';
use Config;

# Which file to look for the %configtests variable in
my $configTestSource = "sync.profile";

if ($#ARGV < 3) {
    warn "Usage:\n";
    warn "  $0 <module base directory> <module output directory> <QtBase directory> <generator spec>\n";
    exit 1;
}

# These might be needed in sync.profile
our $basedir = $ARGV[0];
our $out_basedir = $ARGV[1];
our $qtbasedir = $ARGV[2];
my $generator = $ARGV[3];

our %configtests;

my $qmakeCachePath = catfile($out_basedir, ".qmake.cache");

my $QMAKE = catfile($qtbasedir, "bin", ($^O =~ /win32/i) ? 'qmake.exe' : 'qmake');
if (!-x $QMAKE) {
    # try the qmake from the path (e.g. this is a shadow build)
    $QMAKE = 'qmake';
}

# Need to use the right make
# SYMBIAN_UNIX/MINGW should fall back to the non SYMBIAN ones
my $MAKE = 'make'; # default, only works on unix
if ($generator =~ /UNIX|XCODE/i) { # XCODE = make?
    $MAKE = 'make';
} elsif ($generator =~ /MINGW/i) {
    $MAKE = 'mingw32-make';
} elsif ($generator =~ /MSVC.NET|MSBUILD/i) {
    $MAKE = 'nmake';
} else {
    # Unhandled (at least): BMAKE, GBUILD, SYMBIAN_ABLD, SYMBIAN_SBSV2
    warn "Unrecognized generator spec ($generator) - assuming '$MAKE'\n";
}

######################################################################
# Syntax:  fileContents(filename)
# Params:  filename, string, filename of file to return contents
#
# Purpose: Get the contents of a file.
# Returns: String with contents of the file, or empty string if file
#          doens't exist.
# Warning: Dies if it does exist but script cannot get read access.
######################################################################
sub fileContents {
    my ($filename) = @_;
    my $filecontents = "";
    if (-e $filename) {
        open(I, "< $filename") || die "Could not open $filename for reading, read block?";
        local $/;
        binmode I;
        $filecontents = <I>;
        close I;
    }
    return $filecontents;
}

######################################################################
# Syntax:  loadConfigTests()
#
# Purpose: Loads the config tests from the source basedir into %configtests.
# Returns: Nothing
######################################################################
sub loadConfigTests {
    my $configprofile = catfile($basedir, $configTestSource);
    my $result;
    unless ($result = do $configprofile) {
        die "configtests couldn't parse $configprofile: $@\n" if $@;
        # We don't check for non null output, since that is valid
    }
}

######################################################################
# Syntax:  hashesAreDifferent
#
# Purpose: Compares two hashes. (must have same key=value for everything)
# Returns: 0 if they are the same, 1 otherwise
######################################################################
sub hashesAreDifferent {
    my %a = %{$_[0]};
    my %b = %{$_[1]};

    if (keys %a != keys %b) {
        return 1;
    }

    my %cmp = map { $_ => 1 } keys %a;
    for my $key (keys %b) {
        last unless exists $cmp{$key};
        last unless $a{$key} eq $b{$key};
        delete $cmp{$key};
    }
    if (%cmp) {
        return 1;
    } else {
        return 0;
    }
}

######################################################################
# Syntax:  executeSomething
# Params:  A list of things.
#
# Purpose: Executes the first arg, passing the list.
#          stderr is redirected to stdout, and the output is captured.
# Returns: The output.
######################################################################
sub executeSomething {
    my ($program, @args) = @_;

    my $pid = open(KID_TO_READ, "-|");

    my $output;

    if ($pid) {   # parent
        while (<KID_TO_READ>) {
            $output = $output . $_;
        }
        close(KID_TO_READ) || $! == 0 || warn "\nFailed to execute $program: exited $?";
    } else {
        # redirect STDERR to STDOUT
        open STDERR, ">&STDOUT";

        # Exec something
        exec ($program, @args) || die "\nCan't exec $program: $!\n";
        # NOTREACHED
    }

    return $output;
}

######################################################################
# Syntax:  executeTest()
# Params: testName
#
# The testName variable controls the actual config test run - the
# source is assumed to be in $basedir/config.tests/$testName, and
# when 'qmake; make clean; make' is run, is expected to produce a file
# $out_basedir/config.tests/$testName/$testName.  If this test passes,
# then 'config_test_$testName = yes' will be written to $out_basedir/.qmake.cache
#
# Purpose: Runs a configuration time test.
# Returns: 0 if the test fails, 1 if it passes, 2 if the test is skipped
#          (e.g. .pro file has requires(x) and x is not satisfied)
######################################################################
sub executeTest {
    my ($testName) = @_;

    my $oldWorkingDir = getcwd();
    my $ret = 0;

    my @QMAKEARGS = ('CONFIG-=debug_and_release', 'CONFIG-=app_bundle');

    my $testOutDir = catdir($out_basedir, 'config.tests', $testName);

    # Since we might be cross compiling, look for barename (Linux) and .exe (Win32/Symbian)
    my $testOutFile1 = catfile($testOutDir, "$testName.exe");
    my $testOutFile2 = catfile($testOutDir, $testName);

    if (abs_path($basedir) eq abs_path($out_basedir)) {
        chdir $testOutDir or die "\nUnable to change to config test directory ($testOutDir): $!\n";
    } else { # shadow build
        if (! -e $testOutDir) {
            mkpath $testOutDir or die "\nUnable to create shadow build config test directory ($testOutDir): $!\n";
        }
        chdir $testOutDir or die "\nUnable to change to config test directory ($testOutDir): $!\n";

        push (@QMAKEARGS, catdir($basedir, 'config.tests', $testName));
    }

    # First remove existing stuff (XXX this probably needs generator specific code, but hopefully
    # the target removal below will suffice)
    if (-e "Makefile") {
        executeSomething($MAKE, 'distclean');
    }

    # and any targets that we might find that weren't distcleaned
    unlink $testOutFile1, $testOutFile2;

    # Run qmake && make
    executeSomething($QMAKE, @QMAKEARGS);
    my $makeOutput = executeSomething(($MAKE));

    # If make prints "blah blah blah\nSkipped." we consider this a skipped test
    if ($makeOutput !~ qr(^Skipped\.$)ms) {
        # Check the test exists (can't reliably execute, especially for cross compilation)
        if (-e $testOutFile1 or -e $testOutFile2) {
            $ret = 1;
        }
    } else {
        $ret = 2;
    }

    chdir $oldWorkingDir or die "\nUnable to restore working directory: $!\n";
    return $ret;
}

# Now run configuration tests
# %configtests is a map from config test name to a map of parameters
# e.g:
#
# %configtests = (
#    "simple" => {fatal => 1, message => "Missing required 'simple' component\n"},
#    "failed" => {message => "You need to install the FAILED sdk for this to work\n"}
# );
#
# Parameters and their defaults:
#  - fatal [false] - whether failing this test should abort everything
#  - message [""] - A special message to display if this test fails
#
loadConfigTests();

# Only do this step for modules that have config tests
# (qtbase doesn't). We try to preserve existing contents (and furthermore
# only write to .qmake.cache if the tests change)
if (abs_path($out_basedir) ne abs_path($qtbasedir)) {
    # Read any existing content
    my $existingContents = fileContents($qmakeCachePath);
    my %oldTestResults;
    my %newTestResults;
    my @fatalTestsEncountered;

    # Parse the existing results so we can check if we change them
    while ($existingContents =~ /^config_test_(.*) = (yes|no)$/gm) {
        $oldTestResults{$1} = $2;
    }

    # Get the longest length test name so we can pretty print
    use List::Util qw(max);
    my $maxNameLength = max map { length $_ } keys %configtests;

    # Turn off buffering
    $| = 1;

    # Now run the configuration tests
    print "Configuration tests:\n" if (%configtests);

    while ((my $testName, my $testParameters) = each %configtests) {
        printf "  % *s: ", $maxNameLength, $testName; # right aligned, yes/no lines up

        my $fatalTest = $testParameters->{"fatal"};
        my $message = $testParameters->{"message"};

        my $testResult = executeTest($testName);
        my @testResultStrings = ("no\n","yes\n","skipped\n");

        $newTestResults{$testName} = (($testResult == 1) ? "yes" : "no"); # skipped = no

        if ($testResult == 0) {
            # Failed test
            if ($fatalTest) {
                print "no (fatal)\n";
                # Report the fatality at the end, too
                push (@fatalTestsEncountered, $testName);
            } else {
                print "no\n";
            }
            if (defined($message)) {
                print $message;
                print "\n" unless chop $message eq "\n";
            }
        } else {
            # yes or skipped
            print $testResultStrings[$testResult];
        }
    }

    # Check if the test results are different
    if (hashesAreDifferent(\%oldTestResults, \%newTestResults)) {
        # Generate the new contents
        my $newContents = $existingContents;

        # Strip out any existing config test results
        $newContents =~ s/^config_test_[^\$]*$//gm;
        $newContents =~ s/^# Compile time test results[^\$]*$//gm;

        # Add any remaining content and make sure we start on a new line
        if ($newContents and chop $newContents ne '\n') {
            $newContents = $newContents . "\n";
        }

        # Results and header
        if (%newTestResults) {
            $newContents = $newContents . '# Compile time test results ('.(localtime).")\n";

            # Results
            while ((my $testName, my $testResult) = each %newTestResults) {
                $newContents = $newContents . "config_test_$testName = $testResult\n";
            }
        }

        # Remove blank lines
        $newContents =~ s/^[\s]*$//gms;

        # and open the file
        open my $cacheFileHandle, ">$qmakeCachePath" or die "Unable to open $qmakeCachePath for writing: $!\n";

        print $cacheFileHandle $newContents;

        close $cacheFileHandle or die "Unable to close $qmakeCachePath: $!\n";
    }

    # Now see if we have to die
    if (@fatalTestsEncountered) {
        if ($#fatalTestsEncountered == 0) {
            warn "Mandatory configuration test (".$fatalTestsEncountered[0].") failed.\n\n";
        } else {
            warn "Mandatory configuration tests (". join (", ", @fatalTestsEncountered) . ") failed.\n\n";
        }
        exit -1;
    }
}

exit 0;