# --
# Copyright (C) 2001-2021 OTRS AG, https://otrs.com/
# Copyright (C) 2021 Znuny GmbH, https://znuny.org/
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (GPL). If you
# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
# --
## nofilter(TidyAll::Plugin::Znuny::CodeStyle::STDERRCheck)

package Kernel::System::UnitTest::Driver;

use strict;
use warnings;

use Storable();
use Term::ANSIColor();
use Text::Diff;
use Time::HiRes();

# UnitTest helper must be loaded to override the builtin time functions!
use Kernel::System::UnitTest::Helper;

use Kernel::System::VariableCheck qw(DataIsDifferent);

our @ObjectDependencies = (
    'Kernel::Config',
    'Kernel::System::Main',
);

=head1 NAME

Kernel::System::UnitTest::Driver - unit test file execution wrapper

=head1 PUBLIC INTERFACE

=head2 new()

create unit test driver object. Do not use it directly, instead use:

    my $DriverObject = $Kernel::OM->Create(
        'Kernel::System::UnitTest::Driver',
        ObjectParams => {
            Verbose => $Self->{Verbose},
            ANSI    => $Self->{ANSI},
        },
    );

=cut

sub new {
    my ( $Type, %Param ) = @_;

    # allocate new hash for object
    my $Self = {};
    bless( $Self, $Type );

    $Self->{ANSI}         = $Param{ANSI};
    $Self->{Verbose}      = $Param{Verbose};
    $Self->{DataDiffType} = ucfirst( lc( $Param{DataDiffType} || 'Table' ) );

    # We use an output buffering mechanism if Verbose is not set. Only failed tests will be output in this case.

    # Make sure stuff is always flushed to keep it in the right order.
    *STDOUT->autoflush(1);
    *STDERR->autoflush(1);
    $Self->{OriginalSTDOUT} = *STDOUT;
    $Self->{OriginalSTDOUT}->autoflush(1);
    $Self->{OutputBuffer} = '';

    # Report results via file.
    $Self->{ResultDataFile} = $Kernel::OM->Get('Kernel::Config')->Get('Home') . '/var/tmp/UnitTest.dump';
    unlink $Self->{ResultDataFile};    # purge if exists

    # add TestFile
    $Self->{TestFile} = $Param{TestFile};

    return $Self;
}

=head2 Run()

executes a single unit test file and provides it with an empty environment (fresh C<ObjectManager> instance).

This method assumes that it runs in a dedicated child process just for this one unit test.
This process forking is done in L<Kernel::System::UnitTest>, which creates one child process per test file.

All results will be collected and written to a C<var/tmp/UnitTest.dump> file that the main process will
load to collect all results.

=cut

sub Run {
    my ( $Self, %Param ) = @_;

    my $File = $Param{File};

    my $UnitTestFile = $Kernel::OM->Get('Kernel::System::Main')->FileRead(
        Location => $File,
    );

    if ( !$UnitTestFile ) {
        $Self->True( 0, "ERROR: $!: $File" );
        print STDERR "ERROR: $!: $File\n";
        $Self->_SaveResults();
        return;
    }

    print "+-------------------------------------------------------------------+\n";
    print '  ' . $Self->_Color( 'yellow', $File ) . ":\n";
    print "+-------------------------------------------------------------------+\n";

    my $StartTime = [ Time::HiRes::gettimeofday() ];

    # Create a new scope to be sure to destroy local object of the test files.
    {
        # Make sure every UT uses its own clean environment.
        ## nofilter(TidyAll::Plugin::Znuny::Perl::ObjectManagerCreation)
        local $Kernel::OM = Kernel::System::ObjectManager->new(
            'Kernel::System::Log' => {
                LogPrefix => 'ZNUNY-znuny.UnitTest',
            },
        );

        # Provide $Self as 'Kernel::System::UnitTest' for convenience.
        $Kernel::OM->ObjectInstanceRegister(
            Package      => 'Kernel::System::UnitTest::Driver',
            Object       => $Self,
            Dependencies => [],
        );

        $Self->{OutputBuffer} = '';
        local *STDOUT = *STDOUT;
        local *STDERR = *STDERR;
        if ( !$Self->{Verbose} ) {
            undef *STDOUT;
            undef *STDERR;
            open STDOUT, '>:utf8', \$Self->{OutputBuffer};    ## no critic
            open STDERR, '>:utf8', \$Self->{OutputBuffer};    ## no critic
        }

        # HERE the actual tests are run.
        my $TestSuccess = eval ${$UnitTestFile};              ## no critic

        if ( !$TestSuccess ) {
            if ($@) {
                $Self->True( 0, "ERROR: Error in $File: $@" );
            }
            else {
                $Self->True( 0, "ERROR: $File did not return a true value." );
            }
        }
    }

    $Self->{ResultData}->{Duration} = sprintf( '%.3f', Time::HiRes::tv_interval($StartTime) );

    if ( $Self->{SeleniumData} ) {
        $Self->{ResultData}->{SeleniumData} = $Self->{SeleniumData};
    }

    print { $Self->{OriginalSTDOUT} } "\n" if !$Self->{Verbose};

    my $TestCountTotal = $Self->{ResultData}->{TestOk} // 0;
    $TestCountTotal += $Self->{ResultData}->{TestNotOk} // 0;

    printf(
        "%s ran %s test(s) in %s.\n\n",
        $File,
        $Self->_Color( 'yellow', $TestCountTotal ),
        $Self->_Color( 'yellow', "$Self->{ResultData}->{Duration}s" ),
    );

    return $Self->_SaveResults();
}

=head2 True()

test for a scalar value that evaluates to true.

Send a scalar value to this function along with the test's name:

    $UnitTestObject->True(1, 'Test Name');

    $UnitTestObject->True($ParamA, 'Test Name');

Internally, the function receives this value and evaluates it to see
if it's true, returning 1 in this case or undef, otherwise.

    $UnitTestObject->True(
        $TestValue,
        'Test Name',
    );

=cut

sub True {
    my ( $Self, $True, $Name ) = @_;

    if ( !$Name ) {
        return $Self->_Print( 0, 'Error: test name was not provided.' );
    }

    if ($True) {
        return $Self->_Print( 1, $Name );
    }
    else {
        return $Self->_Print( 0, $Name );
    }
}

=head2 False()

test for a scalar value that evaluates to false.

It has the same interface as L</True()>, but tests
for a false value instead.

    $UnitTestObject->False(1, 'Test Name');

    $UnitTestObject->False($ParamA, 'Test Name');

Internally, the function receives this value and evaluates it to see
if it's false, returning 1 in this case or undef, otherwise.

    $UnitTestObject->False(
        $TestValue,
        'Test Name',
    );

=cut

sub False {
    my ( $Self, $False, $Name ) = @_;

    if ( !$Name ) {
        return $Self->_Print( 0, 'Error: test name was not provided.' );
    }

    if ( !$False ) {
        return $Self->_Print( 1, $Name );
    }
    else {
        return $Self->_Print( 0, $Name );
    }
}

=head2 Is()

compares two scalar values for equality.

To this function you must send a pair of scalar values to compare them,
and the name that the test will take, this is done as shown in the examples
below.

    $UnitTestObject->Is($A, $B, 'Test Name');

Returns 1 if the values were equal, or undef otherwise.

    $UnitTestObject->Is(
        $ValueFromFunction,      # test data
        1,                       # expected value
        'Test Name',
    );

=cut

sub Is {
    my ( $Self, $Test, $ShouldBe, $Name ) = @_;

    if ( !$Name ) {
        return $Self->_Print( 0, 'Error: test name was not provided.' );
    }

    if ( !defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    elsif ( !defined $Test && defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is 'undef' should be '$ShouldBe')" );
    }
    elsif ( defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is '$Test' should be 'undef')" );
    }
    elsif ( $Test eq $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    else {
        return $Self->_Print( 0, "$Name (is '$Test' should be '$ShouldBe')" );
    }
}

=head2 IsNot()

compares two scalar values for inequality.

It has the same interface as L</Is()>, but tests for inequality instead.

    $UnitTestObject->IsNot($A, $B, 'Test Name');

Returns 1 if the values were not equal, or undef otherwise.

    $UnitTestObject->IsNot(
        $ValueFromFunction,      # test data
        1,                       # expected value
        'Test Name',
    );


=cut

sub IsNot {
    my ( $Self, $Test, $ShouldBe, $Name ) = @_;

    if ( !$Name ) {
        return $Self->_Print( 0, 'Error: test name was not provided.' );
    }

    if ( !defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is 'undef')" );
    }
    elsif ( !defined $Test && defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    elsif ( defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    if ( $Test ne $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    else {
        return $Self->_Print( 0, "$Name (is '$Test' should not be '$ShouldBe')" );
    }
}

=head2 IsDeeply()

compares complex data structures for equality.

To this function you must send the references to two data structures to be compared,
and the name that the test will take, this is done as shown in the examples
below.

    $UnitTestObject->IsDeeply($ParamA, $ParamB, 'Test Name');

Where $ParamA and $ParamB must be references to a structure (scalar, list or hash).

Returns 1 if the data structures are the same, or undef otherwise.

    $UnitTestObject->IsDeeply(
        \%ResultHash,           # test data
        \%ExpectedHash,         # expected value
        'Dummy Test Name',
    );

=cut

sub IsDeeply {
    my ( $Self, $Test, $ShouldBe, $Name ) = @_;

    if ( !$Name ) {
        $Self->_Print( 0, 'Error: test name was not provided.' );
        return;
    }

    my $Diff = DataIsDifferent(
        Data1 => $Test,
        Data2 => $ShouldBe,
    );

    if ( !defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    elsif ( !defined $Test && defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is 'undef' should be defined)" );
    }
    elsif ( defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is defined should be 'undef')" );
    }
    elsif ( !$Diff ) {
        return $Self->_Print( 1, $Name );
    }
    else {
        my $TestDump     = $Kernel::OM->Get('Kernel::System::Main')->Dump($Test);
        my $ShouldBeDump = $Kernel::OM->Get('Kernel::System::Main')->Dump($ShouldBe);
        local $ENV{DIFF_OUTPUT_UNICODE} = 1;
        my $Diff = Text::Diff::diff(
            \$TestDump,
            \$ShouldBeDump,
            {
                STYLE      => $Self->{DataDiffType},
                FILENAME_A => 'Actual data',
                FILENAME_B => 'Expected data',
            }
        );

        # Provide colored diff.
        if ( $Self->{ANSI} ) {
            my @DiffLines = split( m{\n}, $Diff );
            $Diff = '';

            for my $DiffLine (@DiffLines) {

                # Diff type "Table"
                if ( $Self->{DataDiffType} eq 'Table' ) {

                    # Line changed
                    if ( substr( $DiffLine, 0, 1 ) eq '*' && substr( $DiffLine, -1, 1 ) eq '*' ) {
                        $DiffLine = $Self->_Color( 'yellow', $DiffLine );
                    }

                    # Line added
                    elsif ( substr( $DiffLine, 0, 1 ) eq '|' && substr( $DiffLine, -1, 1 ) eq '*' ) {
                        $DiffLine = $Self->_Color( 'green', $DiffLine );
                    }

                    # Line removed
                    elsif ( substr( $DiffLine, 0, 1 ) eq '*' && substr( $DiffLine, -1, 1 ) eq '|' ) {
                        $DiffLine = $Self->_Color( 'red', $DiffLine );
                    }
                }

                # Diff type "Unified"
                else {
                    # Line added
                    if ( substr( $DiffLine, 0, 1 ) eq '+' && substr( $DiffLine, 0, 4 ) ne '+++ ' ) {
                        $DiffLine = $Self->_Color( 'green', $DiffLine );
                    }

                    # Line removed
                    elsif ( substr( $DiffLine, 0, 1 ) eq '-' && substr( $DiffLine, 0, 4 ) ne '--- ' ) {
                        $DiffLine = $Self->_Color( 'red', $DiffLine );
                    }
                }
                $Diff .= $DiffLine . "\n";
            }
        }

        my $Output;
        $Output .= $Self->_Color( 'yellow', "Diff" ) . ":\n$Diff\n";
        $Output .= $Self->_Color( 'yellow', "Actual data" ) . ":\n$TestDump\n";
        $Output .= $Self->_Color( 'yellow', "Expected data" ) . ":\n$ShouldBeDump\n";

        return $Self->_Print( 0, "$Name (is not equal, see below)\n$Output" );
    }
}

=head2 IsNotDeeply()

compares two data structures for inequality.

It has the same interface as L</IsDeeply()>, but tests for inequality instead.

    $UnitTestObject->IsNotDeeply($ParamA, $ParamB, 'Test Name');

Where $ParamA and $ParamB must be references to a structure (scalar, list or hash).

Returns 1 if the data structures are not the same, or undef otherwise.

    $UnitTestObject->IsNotDeeply(
        \%ResultHash,           # test data
        \%ExpectedHash,         # expected value
        'Dummy Test Name',
    );

=cut

sub IsNotDeeply {
    my ( $Self, $Test, $ShouldBe, $Name ) = @_;

    if ( !$Name ) {
        $Self->_Print( 0, 'Error: test name was not provided.' );
        return;
    }

    my $Diff = DataIsDifferent(
        Data1 => $Test,
        Data2 => $ShouldBe,
    );

    if ( !defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 0, "$Name (is 'undef')" );
    }
    elsif ( !defined $Test && defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }
    elsif ( defined $Test && !defined $ShouldBe ) {
        return $Self->_Print( 1, $Name );
    }

    if ($Diff) {
        return $Self->_Print( 1, $Name );
    }
    else {
        my $TestDump = $Kernel::OM->Get('Kernel::System::Main')->Dump($Test);
        my $Output   = $Self->_Color( 'yellow', "Actual data" ) . ":\n$TestDump\n";
        return $Self->_Print( 0, "$Name (the structures are wrongly equal, see below)\n$Output" );
    }
}

=head2 AttachSeleniumScreenshot()

attach a screenshot taken during Selenium error handling. These will be sent to the server
together with the test results.

    $UnitTestObject->AttachSeleniumScreenshot(
        Filename => $Filename,
        Content  => $Data               # raw image data
    );

=cut

sub AttachSeleniumScreenshot {
    my ( $Self, %Param ) = @_;

    push @{ $Self->{ResultData}->{Results}->{ $Self->{TestCount} }->{Screenshots} },
        {
        Filename => $Param{Filename},
        Content  => $Param{Content},
        };

    return;
}

=begin Internal:

Private functions used by this package (not part of the documented public API).

=end Internal:

=head2 _SaveResults()

save the results to a file

    my $Success = $UnitTestObject->_SaveResults();

Returns 1 if the results were saved successfully, or undef otherwise.

=cut

sub _SaveResults {
    my ($Self) = @_;

    if ( !$Self->{ResultData} ) {
        $Self->True( 0, 'No result data found.' );
    }

    my $Success = Storable::nstore( $Self->{ResultData}, $Self->{ResultDataFile} );
    if ( !$Success ) {
        print STDERR $Self->_Color( 'red', "Could not store result data in $Self->{ResultDataFile}\n" );
        return 0;
    }

    return 1;
}

sub _Print {
    my ( $Self, $ResultOk, $Message ) = @_;

    $Message ||= '->>No Name!<<-';

    my $ShortMessage = $Message;
    if ( length $ShortMessage > 2_000 && !$Self->{Verbose} ) {
        $ShortMessage = substr( $ShortMessage, 0, 2_000 ) . "[...]";
    }

    if ( $Self->{Verbose} || !$ResultOk ) {

        # Work around problem with leading \0 bytes in the output buffer
        #   which breaks the unicode output. The reason is not certain, maybe because of
        #   Perl's exception handling.
        $Self->{OutputBuffer} =~ s{\0}{}g;
        print { $Self->{OriginalSTDOUT} } $Self->{OutputBuffer};
    }
    $Self->{OutputBuffer} = '';

    $Self->{TestCount}++;
    if ($ResultOk) {
        if ( $Self->{Verbose} ) {
            print { $Self->{OriginalSTDOUT} } " "
                . $Self->_Color( 'green', "ok" )
                . " $Self->{TestCount} - $ShortMessage\n";
        }
        else {
            print { $Self->{OriginalSTDOUT} } $Self->_Color( 'green', "." );
        }

        $Self->{ResultData}->{TestOk}++;
        return 1;
    }
    else {
        if ( !$Self->{Verbose} ) {
            print { $Self->{OriginalSTDOUT} } "\n";
        }
        print { $Self->{OriginalSTDOUT} } " "
            . $Self->_Color( 'red', "not ok" )
            . " $Self->{TestCount} - $ShortMessage\n";
        $Self->{ResultData}->{TestNotOk}++;
        $Self->{ResultData}->{Results}->{ $Self->{TestCount} }->{Status}  = 'not ok';
        $Self->{ResultData}->{Results}->{ $Self->{TestCount} }->{Message} = $Message;

        # Failure summary: only the first line
        my $TestFailureDetails = ( split m/\r?\n/, $Message )[0];

        # And only without details
        $TestFailureDetails =~ s{\s*\(.+\Z}{};
        if ( length $TestFailureDetails > 100 ) {
            $TestFailureDetails = substr( $TestFailureDetails, 0, 100 ) . "[...]";
        }

        # Store information about failed tests, but only if we are running in a toplevel unit test object
        #   that is actually processing files, and not in an embedded object that just runs individual tests.
        push @{ $Self->{ResultData}->{NotOkInfo} }, sprintf "#%s - %s", $Self->{TestCount},
            $TestFailureDetails;

        return;
    }
}

=head2 _Color()

this will color the given text (see Term::ANSIColor::color()) if
ANSI output is available and active, otherwise the text stays unchanged.

    my $PossiblyColoredText = $CommandObject->_Color('green', $Text);

=cut

sub _Color {
    my ( $Self, $Color, $Text ) = @_;

    return $Text if !$Self->{ANSI};
    return Term::ANSIColor::color($Color) . $Text . Term::ANSIColor::color('reset');
}

1;

=head1 TERMS AND CONDITIONS

This software is part of the OTRS project (L<https://otrs.org/>).

This software comes with ABSOLUTELY NO WARRANTY. For details, see
the enclosed file COPYING for license information (GPL). If you
did not receive this file, see L<https://www.gnu.org/licenses/gpl-3.0.txt>.

=cut
