#!perl

use strict;
use warnings;

use Test::More tests => 11877;

###############################################################################
# Read and load configuration file and backend library.

use Config::Tiny ();

my $config_file = 'xt/author/lib.ini';
my $config = Config::Tiny -> read('xt/author/lib.ini')
  or die Config::Tiny -> errstr();

# Read the library to test.

our $LIB = $config->{_}->{lib};

die "No library defined in file '$config_file'"
  unless defined $LIB;
die "Invalid library name '$LIB' in file '$config_file'"
  unless $LIB =~ /^[A-Za-z]\w*(::\w+)*\z/;

# Load the library.

eval "require $LIB";
die $@ if $@;

###############################################################################

can_ok($LIB, '_str');

use lib "t";
use Math::BigInt::Lib::TestUtil qw< randstr >;

# Generate test data.

my @data;

push @data, 0 .. 250;                   # small integers

for (my $n = 3 ; $n <= 250 ; ++ $n) {
    push @data, "1" . ("0" x $n);       # powers of 10
}

for (my $n = 4 ; $n <= 250 ; ++ $n) {
    for (1 .. 10) {
        push @data, randstr($n, 10);    # random $n-digit integer
    }
}

# List context.

for (my $i = 0 ; $i <= $#data ; ++ $i) {
    my ($in0) = $data[$i];
    my $out0 = $in0;

    my ($x, @got);

    my $test = qq|\$x = $LIB->_new("$in0"); |
             . qq|\@got = $LIB->_str(\$x);|;

    diag("\n$test\n\n") if $ENV{AUTHOR_DEBUGGING};

    eval $test;
    is($@, "", "'$test' gives emtpy \$\@");

    subtest "_str() in list context: $test", sub {
        plan tests => 3;

        cmp_ok(scalar @got, '==', 1,
               "'$test' gives one output arg");

        is(ref($got[0]), "",
           "'$test' output arg is a scalar");

        is($got[0], $out0,
           "'$test' output arg has the right value");
    };
}

# Scalar context.

for (my $i = 0 ; $i <= $#data ; ++ $i) {
    my ($in0) = $data[$i];
    my $out0 = $in0;

    my ($x, $got);

    my $test = qq|\$x = $LIB->_new("$in0"); |
             . qq|\$got = $LIB->_str(\$x);|;

    diag("\n$test\n\n") if $ENV{AUTHOR_DEBUGGING};

    eval $test;
    is($@, "", "'$test' gives emtpy \$\@");

    subtest "_str() in scalar context: $test", sub {
        plan tests => 2;

        is(ref($got), "",
           "'$test' output arg is a scalar");

        is($got, $out0,
           "'$test' output arg has the right value");
    };
}
