use v6;

use Test;

if $?PUGS_BACKEND ne "BACKEND_PUGS" {
  skip_rest "Test makes little sense (Pugs the *compiler* is tested)";
  # Plus, PIL2JS can't do IO.
  exit;
}

sub nonce () { return (".{$*PID}." ~ (1..1000).pick) }

my $ignore_errors = q[
  BEGIN {
    say $*ERR:
      "Please ignore any errors this test outputs regarding BEGIN and CHECK blocks.\n" ~
      "The error messages are expected and tested for.";
  }
];

my $tmpfile = "temp-test" ~ nonce();
my @tests = (
    # Test that "open 'README'" works
    'my $fh = open "README"; print($fh ?? "ok" !! "nok")',
    { $^a eq "ok" },
    
    # Test open('README') in BEGIN, CHECK, and INIT
    $ignore_errors ~ 'my $fh = BEGIN { open "README" }; print "_nok_"',
    { $^a !~~ rx:P5/_nok_/ },

    $ignore_errors ~ 'my $fh = CHECK { open "README" }; print "_nok_"',
    { $^a !~~ rx:P5/_nok_/ },

    'my $fh = INIT { open "README" }; print($fh ?? "ok" !! "nok")',
    { $^a eq "ok" },

    # Test my $fh = open('README'); { $fh } in BEGIN, CHECK
    $ignore_errors ~ 'my $fh = BEGIN { my $f = open "README"; ({ $f },) }; print "_nok_"',
    { $^a !~~ rx:P5/_nok_/ },

    $ignore_errors ~ 'my $fh = CHECK { my $f = open "README"; ({ $f },) }; print "_nok_"',
    { $^a !~~ rx:P5/_nok_/ },

    'my $fh = INIT { my $f = open "README"; ({ $f },) }; print($fh ?? "ok" !! "nok")',
    { $^a eq "ok" },
);

plan +@tests / 2;
force_todo 5, 6;

diag "Running under $*OS";

my $redir = ">";

if $*OS eq any <MSWin32 mingw msys cygwin> {
  $redir = '>';
};

for @tests -> $code_to_run, $condition {
  state $i; $i++;

  {
      my $fh = open("$tmpfile-src", :w);
      say $fh: $code_to_run;
      close $fh;
  }

  my $command = "$*EXECUTABLE_NAME $tmpfile-src $redir $tmpfile-out";
  diag "Code to be run:\n  $code_to_run";
  diag "Pugs will be started using:\n  $command";
  system $command;

  my $got     = slurp "$tmpfile-out";
  unlink map { "$tmpfile-$_" }, <src out opened>;
  diag "The code wrote to STDOUT:\n  $got";

  ok $condition($got), "IO handles created at compile-time may not leak into runtime ($i)";
}