#!/usr/bin/env/perl

use strict;
use warnings;

my @answer;   

#added to suppress warnings, but it still doesn't work.
my ($a, $b, $c) = 0;

print "0. Value of ARGV is @ARGV; Value of magic array var is @_.\n";

# Take list of arguments from any of the 4 other subroutines
 # In principle, should accept variable length arguments
 # and recursively reduce the items in list from right to left.
 #
 # Termination: @angle has 1 length. This is pushed onto @answer array.
 # Case 1: reduce negative number by adding 60 to it, and 
 #         subtracting 1 from number on left.
 # Case 2: reduce positive number >= 60 by subtracting 60 and 
 #         adding 1 to number on left.

sub reduce {
# print "0. Value of magic array var is @_.\n"; 
 my @angle = @_;
#  @_ = undef;
 my ($b, $c) = ($angle[-2], $angle[-1]); # reduce from end.

# Warnings when running test script indicate $c in the if statement is not defined.  
# But It is defined at the top, and should be defined if the @ARGV variable is being passed correctly.

  if ($c < 0 && scalar(@angle) > 1) {
   until ($c >= 0 && $c < 60) {
     $c += 60;
     $b -=  1;
     }
     unshift(@answer, $c);
     pop(@angle);
     @angle[-1] = $b;
# Debug print statements
     print "2. b = $b, c = $c\n";
     print "2. Angle array is @angle.\n ";
     print "2. Value of magic array var is @_.\n";
     print "2. Values in answer array: @answer.\n";
####
     
     &reduce(@angle);
    
  } elsif ($c >= 60 && scalar(@angle) > 1 ) {
     until ($c < 60 && $c >= 0) {
     $c -= 60;
     $b += 1;
     }
     unshift(@answer, $c);
     pop(@angle);
     @angle[-1] = $b;
# Debug print statements
     print "3. b = $b, c = $c\n";
     print "3. Angle array is @angle.\n ";
     print "3. Value of magic array var is @_.\n";
     print "3. Values in answer array: @answer.\n";
####
              
     &reduce(@angle);
    
  } elsif ( ($c >= 0 && $c < 60 ) && scalar(@angle) > 1)  {
     unshift(@answer, $c);
     pop(@angle);
     &reduce(@angle); 
  } else {
     unshift(@answer, @angle);	  	  
     print "Reduced answer: @answer \n";
 }

 return $answer;

 }


main( @ARGV ) unless caller();

sub main {
	
&reduce( @ARGV );

}

##</code><code>##

#!/usr/bin/env/perl

use strict;
use warnings;

use Test::More 'no_plan';

my $test_path = "C:/Users/Greyhat/PDL_Old/trig/src";
ok( require(  "$test_path/reduce.pl" ), 'Load file correctly.' ) or exit;


my @test_2   =   undef;
my $answer_2 =   1;
my $note_2   =   "undef | $answer_2 | 2. Call with no value.";

my @test_3   =   (180, 59, 58);
my @answer_3 =   (180, 59, 58);
my $note_3   =   "@test_3 | @answer_3 | 3. already reduced";

my @test_4   =   (179, 0, 60);
my @answer_4 =   (179, 1,  0);
my $note_4   =   "@test_4 | @answer_4 | 4. test if single carry works correctly";

my @test_5   =   (179, 59, 60) ;
my @answer_5 =   (180, 0, 0) ;
my $note_5   =   "@test_5 | @answer_5 | 5. tests if multiple carry works correctly";

my @test_6   =   (-179, 60, 0); 
my @answer_6 =   (-178, 0, 0);
my $note_6   =   "@test_6 | @answer_6 | 6. test addition with negatives";

my @test_7   =   (0, 0, -60);
my @answer_7 =   (-1, 59, 2); 
my $note_7   =   "@test_7 | @answer_7 | 7. test negative borrow works correctly";

my @test_8   =   (90, 360, 360);
my @answer_8 =   (96, 6, 0); 
my $note_8   =   "@test_8 | @answer_8 | 8. tests if multiple reduce calls work correct";

# Degree Reduction Tests
# Similar problems regardless of how I call the function.  Neither testing via main() or directly calling reduce()
# are effective.

ok(  reduce()           ==  $answer_2, $note_2 );  
ok(  reduce( @test_3  ) ==  @answer_3, $note_3 );                         
ok(  reduce( @test_4  ) ==  @answer_4, $note_4 );                                  
ok(  reduce( @test_5  ) ==  @answer_5, $note_5 );                               
ok(  reduce( @test_6  ) ==  @answer_6, $note_6 );                                  
ok(  reduce( @test_7  ) ==  @answer_7, $note_7 );				    
ok(  reduce( @test_8  ) ==  @answer_8, $note_8 );

# Degree Subtraction Tests

# Degree Multiplication Tests

# Degree Division Tests

# More Complicated expressions with