# -*- mode: perl; -*-

use strict;
use warnings;

use Test::More tests => 1005;

###############################################################################
# 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/;

# Read the reference type(s) the library uses.

our $REF = $config->{_}->{ref};

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

# Load the library.

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

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

can_ok($LIB, '_lucas');

my @data;

# Add data in data file.

(my $datafile = $0) =~ s/\.t/.dat/;
open DATAFILE, $datafile or die "$datafile: can't open file for reading: $!";
while (<DATAFILE>) {
    s/\s+\z//;
    next if /^#/ || ! /\S/;
    push @data, [ split /:/ ];
}
close DATAFILE or die "$datafile: can't close file after reading: $!";

# List context.

for (my $i = 0 ; $i <= $#data ; ++ $i) {
    my $in0 = $i;
    my $out = [ map { $data[$_][1] } 0 .. $i ];

    my ($x, @got);

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

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

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

    subtest "_lucas() in list context: $test", sub {
        plan tests =>  3 * $i + 6,

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

        for (my $j = 0 ; $j <= $#$out ; ++ $j) {

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

            is($LIB->_check($got[$j]), 0,
               "'$test' output is valid");

            is($LIB->_str($got[$j]), $out->[$j],
               "'$test' output arg has the right value");
        }

        is(ref($x), $REF,
           "'$test' input arg is still a $REF");

        ok($LIB->_str($x) eq $out->[-1] || $LIB->_str($x) eq $in0,
           "'$test' input arg has the correct value");
    };
}

# Scalar context.

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

    my ($x, $got);

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

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

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

    subtest "_lucas() in scalar context: $test", sub {
        plan tests => 5,

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

        is($LIB->_check($got), 0,
           "'$test' output is valid");

        is($LIB->_str($got), $out0,
           "'$test' output arg has the right value");

        is(ref($x), $REF,
           "'$test' input arg is still a $REF");

        ok($LIB->_str($x) eq $out0 || $LIB->_str($x) eq $in0,
           "'$test' input arg has the correct value");
    };
}
