#!/usr/bin/perl -w

use strict;
use Test;

BEGIN 
  {
  $| = 1;
  chdir 't' if -d 't';
  unshift @INC, '../lib';		# for running manually
  }

use Math::BigInt::Calc;

BEGIN
  {
  plan tests => 258;
  }

# testing of Math::BigInt::Calc

my $C = 'Math::BigInt::Calc';		# pass classname to sub's

# _new and _str
my $x = $C->_new(\"123"); my $y = $C->_new(\"321");
ok (ref($x),'ARRAY'); ok (${$C->_str($x)},123); ok (${$C->_str($y)},321);

###############################################################################
# _add, _sub, _mul, _div
ok (${$C->_str($C->_add($x,$y))},444);
ok (${$C->_str($C->_sub($x,$y))},123);
ok (${$C->_str($C->_mul($x,$y))},39483);
ok (${$C->_str($C->_div($x,$y))},123);

###############################################################################
# check that mul/div doesn't change $y
# and returns the same reference, not something new
ok (${$C->_str($C->_mul($x,$y))},39483);
ok (${$C->_str($x)},39483); ok (${$C->_str($y)},321);

ok (${$C->_str($C->_div($x,$y))},123);
ok (${$C->_str($x)},123); ok (${$C->_str($y)},321);

$x = $C->_new(\"39483");
my ($x1,$r1) = $C->_div($x,$y);
ok ("$x1","$x");
$C->_inc($x1);
ok ("$x1","$x");
ok (${$C->_str($r1)},'0');

$x = $C->_new(\"39483");	# reset

###############################################################################
my $z = $C->_new(\"2");
ok (${$C->_str($C->_add($x,$z))},39485);
my ($re,$rr) = $C->_div($x,$y);

ok (${$C->_str($re)},123); ok (${$C->_str($rr)},2);

# is_zero, _is_one, _one, _zero
ok ($C->_is_zero($x)||0,0);
ok ($C->_is_one($x)||0,0);

ok (${$C->_str($C->_zero())},"0");
ok (${$C->_str($C->_one())},"1");

# _two() (only used internally)
ok (${$C->_str($C->_two())},"2");

ok ($C->_is_one($C->_one()),1);

ok ($C->_is_one($C->_zero()) || 0,0);

ok ($C->_is_zero($C->_zero()),1);

ok ($C->_is_zero($C->_one()) || 0,0);

# is_odd, is_even
ok ($C->_is_odd($C->_one()),1); ok ($C->_is_odd($C->_zero())||0,0);
ok ($C->_is_even($C->_one()) || 0,0); ok ($C->_is_even($C->_zero()),1);

# _len
$x = $C->_new(\"1"); ok ($C->_len($x),1);
$x = $C->_new(\"12"); ok ($C->_len($x),2);
$x = $C->_new(\"123"); ok ($C->_len($x),3);
$x = $C->_new(\"1234"); ok ($C->_len($x),4);
$x = $C->_new(\"12345"); ok ($C->_len($x),5);
$x = $C->_new(\"123456"); ok ($C->_len($x),6);
$x = $C->_new(\"1234567"); ok ($C->_len($x),7);
$x = $C->_new(\"12345678"); ok ($C->_len($x),8);
$x = $C->_new(\"123456789"); ok ($C->_len($x),9);

$x = $C->_new(\"8"); ok ($C->_len($x),1);
$x = $C->_new(\"21"); ok ($C->_len($x),2);
$x = $C->_new(\"321"); ok ($C->_len($x),3);
$x = $C->_new(\"4321"); ok ($C->_len($x),4);
$x = $C->_new(\"54321"); ok ($C->_len($x),5);
$x = $C->_new(\"654321"); ok ($C->_len($x),6);
$x = $C->_new(\"7654321"); ok ($C->_len($x),7);
$x = $C->_new(\"87654321"); ok ($C->_len($x),8);
$x = $C->_new(\"987654321"); ok ($C->_len($x),9);

for (my $i = 1; $i < 9; $i++)
  {
  my $a = "$i" . '0' x ($i-1);
  $x = $C->_new(\$a); 
  print "# Tried len '$a'\n" unless ok ($C->_len($x),$i);
  }

# _digit
$x = $C->_new(\"123456789");
ok ($C->_digit($x,0),9);
ok ($C->_digit($x,1),8);
ok ($C->_digit($x,2),7);
ok ($C->_digit($x,-1),1);
ok ($C->_digit($x,-2),2);
ok ($C->_digit($x,-3),3);

# _copy
foreach (qw/ 1 12 123 1234 12345 123456 1234567 12345678 123456789/)
  {
  $x = $C->_new(\"$_");
  ok (${$C->_str($C->_copy($x))},"$_");
  ok (${$C->_str($x)},"$_");		# did _copy destroy original x?
  }

# _zeros
$x = $C->_new(\"1256000000"); ok ($C->_zeros($x),6);
$x = $C->_new(\"152"); ok ($C->_zeros($x),0);
$x = $C->_new(\"123000"); ok ($C->_zeros($x),3); 

# _lsft, _rsft
$x = $C->_new(\"10"); $y = $C->_new(\"3"); 
ok (${$C->_str($C->_lsft($x,$y,10))},10000);
$x = $C->_new(\"20"); $y = $C->_new(\"3"); 
ok (${$C->_str($C->_lsft($x,$y,10))},20000);

$x = $C->_new(\"128"); $y = $C->_new(\"4");
ok (${$C->_str($C->_lsft($x,$y,2))}, 128 << 4);

$x = $C->_new(\"1000"); $y = $C->_new(\"3"); 
ok (${$C->_str($C->_rsft($x,$y,10))},1);
$x = $C->_new(\"20000"); $y = $C->_new(\"3"); 
ok (${$C->_str($C->_rsft($x,$y,10))},20);
$x = $C->_new(\"256"); $y = $C->_new(\"4");
ok (${$C->_str($C->_rsft($x,$y,2))},256 >> 4);

$x = $C->_new(\"6411906467305339182857313397200584952398");
$y = $C->_new(\"45");
ok (${$C->_str($C->_rsft($x,$y,10))},0);

# _acmp
$x = $C->_new(\"123456789");
$y = $C->_new(\"987654321");
ok ($C->_acmp($x,$y),-1);
ok ($C->_acmp($y,$x),1);
ok ($C->_acmp($x,$x),0);
ok ($C->_acmp($y,$y),0);

$x = $C->_new(\"1234567890123456789");
$y = $C->_new(\"987654321012345678");
ok ($C->_acmp($x,$y),1);
ok ($C->_acmp($y,$x),-1);
ok ($C->_acmp($x,$x),0);
ok ($C->_acmp($y,$y),0);

$x = $C->_new(\"1234");
$y = $C->_new(\"987654321012345678");
ok ($C->_acmp($x,$y),-1);
ok ($C->_acmp($y,$x),1);
ok ($C->_acmp($x,$x),0);
ok ($C->_acmp($y,$y),0);

# _modinv
$x = $C->_new(\"8");
$y = $C->_new(\"5033");
my ($xmod,$sign) = $C->_modinv($x,$y);
ok (${$C->_str($xmod)},'629');		# -629 % 5033 == 4404
ok ($sign, '-');

# _div
$x = $C->_new(\"3333"); $y = $C->_new(\"1111");
ok (${$C->_str(scalar $C->_div($x,$y))},3);
$x = $C->_new(\"33333"); $y = $C->_new(\"1111"); ($x,$y) = $C->_div($x,$y);
ok (${$C->_str($x)},30); ok (${$C->_str($y)},3);
$x = $C->_new(\"123"); $y = $C->_new(\"1111"); 
($x,$y) = $C->_div($x,$y); ok (${$C->_str($x)},0); ok (${$C->_str($y)},123);

# _num
foreach (qw/1 12 123 1234 12345 1234567 12345678 123456789 1234567890/)
  {
  $x = $C->_new(\"$_"); 
  ok (ref($x)||'','ARRAY'); ok (${$C->_str($x)},"$_");
  $x = $C->_num($x); ok (ref($x)||'',''); ok ($x,$_);
  }

# _sqrt
$x = $C->_new(\"144"); ok (${$C->_str($C->_sqrt($x))},'12');
$x = $C->_new(\"144000000000000"); ok (${$C->_str($C->_sqrt($x))},'12000000');

# _root
$x = $C->_new(\"81"); my $n = $C->_new(\"3"); 	# 4*4*4 = 64, 5*5*5 = 125
ok (${$C->_str($C->_root($x,$n))},'4');	# 4.xx => 4.0
$x = $C->_new(\"81"); $n = $C->_new(\"4"); 	# 3*3*3*3 == 81
ok (${$C->_str($C->_root($x,$n))},'3');

# _fac
$x = $C->_new(\"0"); ok (${$C->_str($C->_fac($x))},'1');
$x = $C->_new(\"1"); ok (${$C->_str($C->_fac($x))},'1');
$x = $C->_new(\"2"); ok (${$C->_str($C->_fac($x))},'2');
$x = $C->_new(\"3"); ok (${$C->_str($C->_fac($x))},'6');
$x = $C->_new(\"4"); ok (${$C->_str($C->_fac($x))},'24');
$x = $C->_new(\"5"); ok (${$C->_str($C->_fac($x))},'120');
$x = $C->_new(\"10"); ok (${$C->_str($C->_fac($x))},'3628800');
$x = $C->_new(\"11"); ok (${$C->_str($C->_fac($x))},'39916800');
$x = $C->_new(\"12"); ok (${$C->_str($C->_fac($x))},'479001600');

##############################################################################
# _inc and _dec
foreach (qw/1 11 121 1231 12341 1234561 12345671 123456781 1234567891/)
  {
  $x = $C->_new(\"$_"); $C->_inc($x);
  print "# \$x = ",${$C->_str($x)},"\n"
   unless ok (${$C->_str($x)},substr($_,0,length($_)-1) . '2');
  $C->_dec($x); ok (${$C->_str($x)},$_);
  }
foreach (qw/19 119 1219 12319 1234519 12345619 123456719 1234567819/)
  {
  $x = $C->_new(\"$_"); $C->_inc($x);
  print "# \$x = ",${$C->_str($x)},"\n"
   unless ok (${$C->_str($x)},substr($_,0,length($_)-2) . '20');
  $C->_dec($x); ok (${$C->_str($x)},$_);
  }
foreach (qw/999 9999 99999 9999999 99999999 999999999 9999999999 99999999999/)
  {
  $x = $C->_new(\"$_"); $C->_inc($x);
  print "# \$x = ",${$C->_str($x)},"\n"
   unless ok (${$C->_str($x)}, '1' . '0' x (length($_)));
  $C->_dec($x); ok (${$C->_str($x)},$_);
  }

$x = $C->_new(\"1000"); $C->_inc($x); ok (${$C->_str($x)},'1001');
$C->_dec($x); ok (${$C->_str($x)},'1000');

my $BL;
{
  no strict 'refs';
  $BL = &{"$C"."::_base_len"}();
}

$x = '1' . '0' x $BL;
$z = '1' . '0' x ($BL-1); $z .= '1';
$x = $C->_new(\$x); $C->_inc($x); ok (${$C->_str($x)},$z);

$x = '1' . '0' x $BL; $z = '9' x $BL;
$x = $C->_new(\$x); $C->_dec($x); ok (${$C->_str($x)},$z);

# should not happen:
# $x = $C->_new(\"-2"); $y = $C->_new(\"4"); ok ($C->_acmp($x,$y),-1);

###############################################################################
# _mod
$x = $C->_new(\"1000"); $y = $C->_new(\"3");
ok (${$C->_str(scalar $C->_mod($x,$y))},1);
$x = $C->_new(\"1000"); $y = $C->_new(\"2");
ok (${$C->_str(scalar $C->_mod($x,$y))},0);

# _and, _or, _xor
$x = $C->_new(\"5"); $y = $C->_new(\"2");
ok (${$C->_str(scalar $C->_xor($x,$y))},7);
$x = $C->_new(\"5"); $y = $C->_new(\"2");
ok (${$C->_str(scalar $C->_or($x,$y))},7);
$x = $C->_new(\"5"); $y = $C->_new(\"3");
ok (${$C->_str(scalar $C->_and($x,$y))},1);

# _from_hex, _from_bin
ok (${$C->_str(scalar $C->_from_hex(\"0xFf"))},255);
ok (${$C->_str(scalar $C->_from_bin(\"0b10101011"))},160+11);

# _as_hex, _as_bin
ok (${$C->_str(scalar $C->_from_hex( $C->_as_hex( $C->_new(\"128"))))}, 128);
ok (${$C->_str(scalar $C->_from_bin( $C->_as_bin( $C->_new(\"128"))))}, 128);
ok (${$C->_str(scalar $C->_from_hex( $C->_as_hex( $C->_new(\"0"))))}, 0);
ok (${$C->_str(scalar $C->_from_bin( $C->_as_bin( $C->_new(\"0"))))}, 0);
ok ( ${$C->_as_hex( $C->_new(\"0"))}, '0x0');
ok ( ${$C->_as_bin( $C->_new(\"0"))}, '0b0');
ok ( ${$C->_as_hex( $C->_new(\"12"))}, '0xc');
ok ( ${$C->_as_bin( $C->_new(\"12"))}, '0b1100');

# _check
$x = $C->_new(\"123456789");
ok ($C->_check($x),0);
ok ($C->_check(123),'123 is not a reference');

###############################################################################
# __strip_zeros

{
  no strict 'refs';
  # correct empty arrays
  $x = &{$C."::__strip_zeros"}([]); ok (@$x,1); ok ($x->[0],0);
  # don't strip single elements
  $x = &{$C."::__strip_zeros"}([0]); ok (@$x,1); ok ($x->[0],0);
  $x = &{$C."::__strip_zeros"}([1]); ok (@$x,1); ok ($x->[0],1);
  # don't strip non-zero elements
  $x = &{$C."::__strip_zeros"}([0,1]);
  ok (@$x,2); ok ($x->[0],0); ok ($x->[1],1);
  $x = &{$C."::__strip_zeros"}([0,1,2]);
  ok (@$x,3); ok ($x->[0],0); ok ($x->[1],1); ok ($x->[2],2);

  # but strip leading zeros
  $x = &{$C."::__strip_zeros"}([0,1,2,0]);
  ok (@$x,3); ok ($x->[0],0); ok ($x->[1],1); ok ($x->[2],2);

  $x = &{$C."::__strip_zeros"}([0,1,2,0,0]);
  ok (@$x,3); ok ($x->[0],0); ok ($x->[1],1); ok ($x->[2],2);

  $x = &{$C."::__strip_zeros"}([0,1,2,0,0,0]);
  ok (@$x,3); ok ($x->[0],0); ok ($x->[1],1); ok ($x->[2],2);

  # collapse multiple zeros
  $x = &{$C."::__strip_zeros"}([0,0,0,0]);
  ok (@$x,1); ok ($x->[0],0);
}

# done

1;