# Copyright (C) 2001-2022 Free Software Foundation, Inc.
#
# 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 2, 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 <https://www.gnu.org/licenses/>.

BEGIN {
  use Config;
  if (eval { require 5.007_002; }	# for CLONE support
      && $Config{useithreads}
      && !$ENV{WANT_NO_THREADS})
    {
      require threads;
      import threads;
    }
  else
    {
      exit 77;
    }
}
use Automake::Condition qw/TRUE FALSE/;
use Automake::DisjConditions;

sub test_basics ()
{
  my $true = new Automake::DisjConditions TRUE;
  my $false = new Automake::DisjConditions FALSE;
  my $cond = new Automake::Condition "COND1_TRUE", "COND2_FALSE";
  return threads->new (sub {
    my $other = new Automake::Condition "COND3_FALSE";
    my $another = new Automake::Condition "COND3_TRUE", "COND4_FALSE";
    return threads->new (sub {
      my $set1 = new Automake::DisjConditions $cond, $other;
      return threads->new (sub {
	my $set2 = new Automake::DisjConditions $other, $cond;
	my $set3 = new Automake::DisjConditions FALSE, $another;
	return 1 unless $set1 == $set2;
	return 1 if $set1->false;
	return 1 if $set1->true;
	return 1 unless (new Automake::DisjConditions)->false;
	return 1 if (new Automake::DisjConditions)->true;
	return 1 unless $true->human eq 'TRUE';
	return 1 unless $false->human eq 'FALSE';
	return 1 unless $set1->human eq "(COND1 and !COND2) or (!COND3)";
	return 1 unless $set2->human eq "(COND1 and !COND2) or (!COND3)";
	my $one_cond_human = $set1->one_cond->human;
	return 1 unless $one_cond_human eq "!COND3"
	                || $one_cond_human eq "COND1 and !COND2";
	return 1 unless $set1->string eq "COND1_TRUE COND2_FALSE | COND3_FALSE";

	my $merged1 = $set1->merge ($set2);
	my $merged2 = $set1->merge ($cond);
	my $mult1 = $set1->multiply ($set3);
	return threads->new (sub {
	  my $mult2 = $set1->multiply ($another);
	  return threads->new (sub {
	    return 1 unless $merged1->simplify->string eq "COND1_TRUE COND2_FALSE | COND3_FALSE";
	    return 1 unless $merged2->simplify->string eq "COND1_TRUE COND2_FALSE | COND3_FALSE";
	    return 1 unless $mult1->string eq "COND1_TRUE COND2_FALSE COND3_TRUE COND4_FALSE";
	    return 1 unless $mult1 == $mult2;
	    return 0;
	  })->join;
	})->join;
      })->join;
    })->join;
  })->join;
}

sub build_set (@)
{
  my @conds = @_;
  my @set = ();
  for my $cond (@conds)
    {
      push @set, new Automake::Condition @$cond;
    }
  return new Automake::DisjConditions @set;
}

sub test_invert ()
{
  my @tests = ([[["FALSE"]],
	        [["TRUE"]]],

	       [[["TRUE"]],
	        [["FALSE"]]],

	       [[["COND1_TRUE", "COND2_TRUE"],
		 ["COND3_FALSE", "COND2_TRUE"]],
		[["COND2_FALSE"],
		 ["COND1_FALSE", "COND3_TRUE"]]],

	       [[["COND1_TRUE", "COND2_TRUE"],
		 ["TRUE"]],
		[["FALSE"]]],

	       [[["COND1_TRUE", "COND2_TRUE"],
		 ["FALSE"]],
		[["COND1_FALSE"],
		 ["COND2_FALSE"]]],

	       [[["COND1_TRUE"],
		 ["COND2_FALSE"]],
		[["COND1_FALSE", "COND2_TRUE"]]]
	       );

  for my $t (@tests)
    {
      my $set = build_set @{$t->[0]};
      return 1
        if threads->new(sub {
	  my $res = build_set @{$t->[1]};
	  my $inv = $set->invert;
	  if ($inv != $res)
	    {
	      print " (I) " . $set->string . "\n\t"
		. $inv->string . ' != ' . $res->string . "\n";
	      return 1;
	    }
	  return 0
	})-> join;
    }
  return 0;
}

sub test_simplify ()
{
  my @tests = ([[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"]],
		[["FOO_TRUE", "BAR_FALSE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_TRUE", "BAR_TRUE"]],
		[["FOO_TRUE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_TRUE", "BAR_TRUE"],
		 ["FOO_FALSE"]],
		[["TRUE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		             ["BAR_TRUE",  "BAZ_TRUE"],
		             ["BAR_FALSE", "BAZ_TRUE"]],
		[["BAZ_TRUE"], ["FOO_TRUE", "BAR_FALSE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		             ["BAR_TRUE",  "BAZ_TRUE"],
		             ["BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_FALSE"]],
		[["FOO_FALSE"], ["BAZ_TRUE"], ["BAR_FALSE"]]],

	       [[["B_TRUE"],
		 ["A_FALSE", "B_TRUE"]],
		[["B_TRUE"]]],

	       [[["B_TRUE"],
		 ["A_FALSE", "B_FALSE", "C_TRUE"],
		 ["A_FALSE", "B_FALSE", "C_FALSE"]],
		[["A_FALSE"], ["B_TRUE"]]],

	       [[["B_TRUE"],
		 ["A_FALSE", "B_FALSE", "C_TRUE"],
		 ["A_FALSE", "B_FALSE", "C_FALSE"],
		 ["A_TRUE", "B_FALSE"]],
		[["TRUE"]]],

	       [[["A_TRUE", "B_TRUE"],
		 ["A_TRUE", "B_FALSE"],
		 ["A_TRUE", "C_FALSE", "D_FALSE"]],
		[["A_TRUE"]]],

	       [[["A_FALSE", "B_FALSE", "C_FALSE", "D_TRUE",  "E_FALSE"],
		 ["A_FALSE", "B_FALSE", "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_FALSE", "D_FALSE", "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_FALSE", "D_FALSE", "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_FALSE", "D_TRUE",  "E_FALSE"]],
		[           ["B_FALSE", "C_FALSE", "D_TRUE",  "E_FALSE"],
		            ["B_FALSE", "C_TRUE",  "D_TRUE",  "E_TRUE"],
		            ["B_TRUE",  "C_TRUE",  "D_FALSE", "E_TRUE"],
		            ["B_TRUE",  "C_FALSE", "D_FALSE", "E_FALSE"]]],

	       [[["A_FALSE", "B_FALSE", "C_FALSE", "D_TRUE",  "E_FALSE"],
		 ["A_FALSE", "B_FALSE", "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_FALSE", "D_FALSE", "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_FALSE", "D_FALSE", "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_FALSE", "D_TRUE",  "E_FALSE"],
		 ["A_FALSE", "B_FALSE", "C_FALSE", "D_FALSE", "E_FALSE"],
		 ["A_FALSE", "B_FALSE", "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_FALSE", "B_TRUE",  "C_FALSE", "D_TRUE",  "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_FALSE", "D_TRUE",  "E_FALSE"],
		 ["A_TRUE",  "B_TRUE",  "C_TRUE",  "D_TRUE",  "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_TRUE",  "D_FALSE", "E_TRUE"],
		 ["A_TRUE",  "B_FALSE", "C_FALSE", "D_FALSE", "E_FALSE"]],
		[["C_FALSE", "E_FALSE"],
		 ["C_TRUE", "E_TRUE"]]],

	       [[["A_FALSE"],
		 ["A_TRUE", "B_FALSE"],
		 ["A_TRUE", "B_TRUE", "C_FALSE"],
		 ["A_TRUE", "B_TRUE", "C_TRUE", "D_FALSE"],
		 ["A_TRUE", "B_TRUE", "C_TRUE", "D_TRUE", "E_FALSE"],
		 ["A_TRUE", "B_TRUE", "C_TRUE", "D_TRUE", "E_TRUE", "F_FALSE"],
		 ["A_TRUE", "B_TRUE", "C_TRUE", "D_TRUE", "E_TRUE"]],
		[["TRUE"]]],

	       # Simplify should work with up to 31 variables.
	       [[["V01_TRUE", "V02_TRUE", "V03_TRUE", "V04_TRUE", "V05_TRUE",
		  "V06_TRUE", "V07_TRUE", "V08_TRUE", "V09_TRUE", "V10_TRUE",
		  "V11_TRUE", "V12_TRUE", "V13_TRUE", "V14_TRUE", "V15_TRUE",
		  "V16_TRUE", "V17_TRUE", "V18_TRUE", "V19_TRUE", "V20_TRUE",
		  "V21_TRUE", "V22_TRUE", "V23_TRUE", "V24_TRUE", "V25_TRUE",
		  "V26_TRUE", "V27_TRUE", "V28_TRUE", "V29_TRUE", "V30_TRUE",
		  "V31_TRUE"],
		 ["V01_TRUE", "V02_TRUE", "V03_TRUE", "V04_TRUE", "V05_TRUE",
		  "V06_TRUE", "V07_TRUE", "V08_TRUE", "V09_TRUE", "V10_TRUE",
		  "V11_TRUE", "V12_TRUE", "V13_TRUE", "V14_TRUE", "V15_TRUE",
		  "V16_TRUE", "V17_TRUE", "V18_TRUE", "V19_TRUE", "V20_TRUE",
		  "V21_TRUE", "V22_TRUE", "V23_TRUE", "V24_TRUE", "V25_TRUE",
		  "V26_TRUE", "V27_TRUE", "V28_TRUE", "V29_TRUE", "V30_TRUE",
		  "V31_FALSE"],
		 ["V01_FALSE","V02_TRUE", "V03_TRUE", "V04_TRUE", "V05_TRUE",
		  "V06_TRUE", "V07_TRUE", "V08_TRUE", "V09_TRUE", "V10_TRUE",
		  "V11_TRUE", "V12_TRUE", "V13_TRUE", "V14_TRUE", "V15_TRUE",
		  "V16_TRUE", "V17_TRUE", "V18_TRUE", "V19_TRUE", "V20_TRUE",
		  "V21_TRUE", "V22_TRUE", "V23_TRUE", "V24_TRUE", "V25_TRUE",
		  "V26_TRUE", "V27_TRUE", "V28_TRUE", "V29_TRUE", "V30_TRUE",
		  "V31_TRUE"],
		 ["V01_FALSE","V02_TRUE", "V03_TRUE", "V04_TRUE", "V05_TRUE",
		  "V06_TRUE", "V07_TRUE", "V08_TRUE", "V09_TRUE", "V10_TRUE",
		  "V11_TRUE", "V12_TRUE", "V13_TRUE", "V14_TRUE", "V15_TRUE",
		  "V16_TRUE", "V17_TRUE", "V18_TRUE", "V19_TRUE", "V20_TRUE",
		  "V21_TRUE", "V22_TRUE", "V23_TRUE", "V24_TRUE", "V25_TRUE",
		  "V26_TRUE", "V27_TRUE", "V28_TRUE", "V29_TRUE", "V30_TRUE",
		  "V31_FALSE"]],
		[[            "V02_TRUE", "V03_TRUE", "V04_TRUE", "V05_TRUE",
		  "V06_TRUE", "V07_TRUE", "V08_TRUE", "V09_TRUE", "V10_TRUE",
		  "V11_TRUE", "V12_TRUE", "V13_TRUE", "V14_TRUE", "V15_TRUE",
		  "V16_TRUE", "V17_TRUE", "V18_TRUE", "V19_TRUE", "V20_TRUE",
		  "V21_TRUE", "V22_TRUE", "V23_TRUE", "V24_TRUE", "V25_TRUE",
		  "V26_TRUE", "V27_TRUE", "V28_TRUE", "V29_TRUE", "V30_TRUE"
		  ]]]);

  for my $t (@tests)
    {
      my $set = build_set @{$t->[0]};
      return 1
	if threads->new(sub {
	  my $res = build_set @{$t->[1]};
	  return threads->new(sub {

	    # Make sure simplify() yields the expected result.
	    my $sim = $set->simplify;
	    return threads->new(sub {
	      if ($sim != $res)
		{
		  print " (S1) " . $set->string . "\n\t"
		    . $sim->string . ' != ' . $res->string . "\n";
		  return 1;
		}

	      # Make sure simplify() is idempotent.
	      my $sim2 = $sim->simplify;
	      return threads->new(sub {
		if ($sim2 != $sim)
		  {
		    print " (S2) " . $sim->string . "\n\t"
		      . $sim2->string . ' != ' . $sim->string . "\n";
		    return 1;
		  }

		# Also exercise invert() while we are at it.

		my $inv1 = $set->invert->simplify;
		return threads->new(sub {
		  my $inv2 = $sim->invert->simplify;
		  return threads->new(sub {
		    if ($inv1 != $inv2)
		      {
			print " (S3) " . $set->string . ", " . $sim->string . "\n\t"
			  . $inv1->string . ' -= ' . $inv2->string . "\n";
			return 1;
		      }
		  })->join;
		})->join;
	      })->join;
	    })->join;
	  })->join;
	})->join;
    }

  return 0;
}

sub test_sub_conditions ()
{
  my @tests = ([[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_FALSE"]],
		["FOO_TRUE"],
		[["BAR_FALSE", "BAZ_FALSE"],
		 ["BAR_FALSE", "BAZ_TRUE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_FALSE"]],
		["FOO_TRUE", "BAR_FALSE"],
		[["BAZ_FALSE"],
		 ["BAZ_TRUE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAR_FALSE", "BAZ_TRUE"],
		 ["FOO_FALSE"]],
		["FOO_TRUE", "BAR_TRUE"],
		[["FALSE"]]],

	       [[["FOO_TRUE", "BAR_FALSE", "BAZ_FALSE"],
		 ["FOO_TRUE", "BAZ_TRUE"],
		 ["FOO_FALSE"]],
		["FOO_TRUE", "BAR_TRUE"],
		[["BAZ_TRUE"]]],

	       [[["FOO_TRUE", "BAR_FALSE"],
		 ["FOO_TRUE", "BAR_TRUE"]],
		["FOO_TRUE", "BAR_TRUE"],
		[["TRUE"]]],

	       [[["TRUE"]],
		["TRUE"],
		[["TRUE"]]],

	       [[["FALSE"]],
		["TRUE"],
		[["FALSE"]]],

	       [[["FALSE"]],
		["FALSE"],
		[["FALSE"]]]);

  for my $t (@tests)
    {
      my $t1 = build_set @{$t->[0]};
      return 1
        if threads->new(sub {
	  my $t2 = new Automake::Condition @{$t->[1]};
	  return threads->new(sub {
	    my $t3 = build_set @{$t->[2]};
	    return threads->new(sub {

	      # Make sure sub_conditions() yields the expected result.
	      my $s = $t1->sub_conditions ($t2);
	      threads->new(sub {
		if ($s != $t3)
		  {
		    print " (SC) " . $t1->string . "\n\t"
		      . $s->string . ' != ' . $t3->string . "\n";
		    return 1;
		  }
	      })->join;
	    })->join;
	  })->join;
	})->join;
    }
}

sub test_ambig ()
{
  my @tests = ([[["TRUE"]],
		["TRUE"],
		"multiply defined"],
	       [[["C1_TRUE"]],
		["C1_TRUE"],
		"multiply defined"],
	       [[["TRUE"]],
                ["C1_FALSE"],
		"which includes"],
	       [[["C1_TRUE"]],
		["C1_TRUE", "C2_TRUE"],
		"which includes"],
	       [[["C1_TRUE", "C2_TRUE"]],
		["C2_TRUE"],
		"which is included in"],
	       [[["C1_TRUE"]],
		["C2_TRUE"],
		''],
	       [[["C1_TRUE"],
		 ["C2_FALSE"]],
		["C1_FALSE", "C2_TRUE"],
		'']);

  my $failed = 0;
  for my $t (@tests)
    {
      my $t1 = build_set @{$t->[0]};
      $failed = 1
        if threads->new(sub {
	  my $t2 = new Automake::Condition @{$t->[1]};
	  my $t3 = $t->[2];
	  return threads->new(sub {
	    my ($ans, $cond) = $t1->ambiguous_p ("FOO", $t2);
	    return threads->new(sub {
	      if ($t3 && $ans !~ /FOO.*$t3/)
		{
		  print " (A1) " . $t1->string . " vs. " . $t2->string . "\n\t"
		    . "Error message '$ans' does not match '$t3'\n";
		  return 1;
		}
	      if (!$t3 && $ans ne '')
		{
		  print " (A2) " . $t1->string . " vs. " . $t2->string . "\n\t"
		    . "Unexpected error message: $ans\n";
		  return 1;
		}
	    })->join;
	  })->join;
	})->join;
    }
  return $failed;
}

exit (test_basics
      || test_invert
      || test_simplify
      || test_sub_conditions
      || test_ambig);