#!/usr/bin/env perl
require 5.008;
use warnings;
use strict;

unshift(@INC, '.');
require qpdf_test_helpers;

chdir("qpdf") or die "chdir testdir failed: $!\n";

require TestDriver;

my $td = new TestDriver('large-file');

my $large_file_test_path = $ENV{'QPDF_LARGE_FILE_TEST_PATH'} || undef;
if (defined($large_file_test_path))
{
    $large_file_test_path = File::Spec->rel2abs($large_file_test_path);
    $large_file_test_path =~ s!\\!/!g;
}

large_cleanup();

my $nlarge = 1;
if (defined $large_file_test_path)
{
    $nlarge = 2;
}
else
{
    $td->notify("--- Skipping tests on actual large files ---");
}

my $n_tests = $nlarge * 21;
for (my $large = 0; $large < $nlarge; ++$large)
{
    my $now = time();
    my $show_time = sub {};
    if ($large)
    {
        $td->notify("--- Running tests on actual large files ---");
        $show_time = sub {
            $td->notify("--- time: " . (time() - $now));
        };
    }
    else
    {
        $td->notify("--- Running large file tests on small files ---");
    }
    my $size = ($large ? "large" : "small");
    my $file = $large ? "$large_file_test_path/a.pdf" : "a.pdf";
    my $json = $large ? "$large_file_test_path/a.json" : "a.json";
    # Pick a stream near the end of the file to test.
    my $stream = $large ? "$large_file_test_path/a.json-603" : "a.json-603";
    $now = time();
    $td->runtest("write test file",
                 {$td->COMMAND => "test_large_file write $size '$file'"},
                 {$td->FILE => "large_file.out", $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);
    &$show_time();
    $now = time();
    $td->runtest("read test file",
                 {$td->COMMAND => "test_large_file read $size '$file'"},
                 {$td->FILE => "large_file.out", $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);
    &$show_time();
    $td->runtest("check",
                 {$td->COMMAND => "qpdf --suppress-recovery --check '$file'",
                  $td->FILTER => "grep -v checking"},
                 {$td->FILE => "large_file-check-normal.out",
                  $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);

    $now = time();
    $td->runtest("large to json inline",
                 {$td->COMMAND => "qpdf --json-output '$file' '$json'"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    &$show_time();
    $now = time();
    $td->runtest("json inline to large",
                 {$td->COMMAND =>
                      "qpdf --json-input --compress-streams=n" .
                      " --static-id '$json' '$file'"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    &$show_time();
    $td->runtest("read test file",
                 {$td->COMMAND => "test_large_file read $size '$file'"},
                 {$td->FILE => "large_file.out", $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);
    $now = time();
    $td->runtest("large to json with file",
                 {$td->COMMAND =>
                      "qpdf --json-output --json-stream-data=file" .
                      " '$file' '$json'"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    &$show_time();
    $td->runtest("inspect json",
                 {$td->FILE => $json, $td->FILTER => "perl filter-json.pl"},
                 {$td->FILE => "exp-large-json.json"},
                 $td->NORMALIZE_NEWLINES);
    $td->runtest("spot check stream",
                 {$td->FILE => $stream},
                 {$td->FILE => "exp-large-stream"},
                 $td->NORMALIZE_NEWLINES);
    $now = time();
    $td->runtest("json with file to large",
                 {$td->COMMAND =>
                      "qpdf --json-input" .
                      " --compress-streams=n '$json' '$file'"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    &$show_time();
    $td->runtest("read test file",
                 {$td->COMMAND => "test_large_file read $size '$file'"},
                 {$td->FILE => "large_file.out", $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);

    for my $ostream (0, 1)
    {
        for my $linearize (0, 1)
        {
            if (($ostream == 0) && ($linearize == 0))
            {
                # Original file has no object streams and is not linearized.
                next;
            }
            my $args = "";
            my $omode = $ostream ? "generate" : "disable";
            my $lin = $linearize ? "--linearize" : "";
            my $newfile = "$file-new";

            $td->runtest("transform: ostream=$ostream, linearize=$linearize",
                         {$td->COMMAND =>
                              "qpdf --stream-data=preserve" .
                              " --object-streams=$omode" .
                              " $lin '$file' '$newfile'"},
                         {$td->STRING => "", $td->EXIT_STATUS => 0});
            $td->runtest("read: ostream=$ostream, linearize=$linearize",
                         {$td->COMMAND =>
                              "test_large_file read $size '$newfile'"},
                         {$td->FILE => "large_file.out", $td->EXIT_STATUS => 0},
                         $td->NORMALIZE_NEWLINES);
            my $check_out =
                ($linearize
                 ? ($ostream
                    ? "large_file-check-ostream-linearized.out"
                    : "large_file-check-linearized.out")
                 : ($ostream
                    ? "large_file-check-ostream.out"
                    : "large_file-check-normal.out"));
            $td->runtest("check: ostream=$ostream, linearize=$linearize",
                         {$td->COMMAND =>
                              "qpdf --suppress-recovery --check '$newfile'",
                          $td->FILTER => "grep -v checking"},
                         {$td->FILE => $check_out, $td->EXIT_STATUS => 0},
                         $td->NORMALIZE_NEWLINES);
            unlink $newfile;
        }
    }

    # Clobber xref
    open(F, "+<$file") or die;
    seek(F, -50, 2);
    my $pos = tell F;
    my $buf;
    read(F, $buf, 50);
    die unless $buf =~ m/^(.*startxref\n)\d+/s;
    $pos += length($1);
    seek(F, $pos, 0) or die;
    print F "oops" or die;
    close(F);

    my $cmd = +{$td->COMMAND => "test_large_file read $size '$file'"};
    if ($large)
    {
        $cmd->{$td->FILTER} = "sed -e 's,$large_file_test_path/,,'";
    }
    $td->runtest("reconstruct xref table",
                 $cmd,
                 {$td->FILE => "large_file_xref_reconstruct.out",
                  $td->EXIT_STATUS => 0},
                 $td->NORMALIZE_NEWLINES);
    unlink $file;
    large_cleanup();
}

large_cleanup();

sub large_cleanup
{
    cleanup();
    system("rm -f a.json* a.pdf*");
    if (defined $large_file_test_path)
    {
        system("rm -f $large_file_test_path/a.pdf*" .
               " $large_file_test_path/a.json*");
    }
}

$td->report($n_tests);