#!/usr/bin/perl
#
# logformatter - highlight a Cirrus test log (ginkgo or bats)
#
# Adapted from https://raw.githubusercontent.com/edsantiago/greasemonkey/podman-ginkgo-highlight
#
package LibPod::CI::LogFormatter;

use v5.14;
use utf8;

# Grumble. CI system doesn't have 'open'
binmode STDIN,  ':utf8';
binmode STDOUT, ':utf8';

use strict;
use warnings;

(our $ME = $0) =~ s|.*/||;

our $VERSION = '0.1';

# For debugging, show data structures using DumpTree($var)
#use Data::TreeDumper; $Data::TreeDumper::Displayaddress = 0;

###############################################################################
# BEGIN user-customizable section

# Stylesheet for highlighting or de-highlighting parts of lines
our $CSS = <<'END_CSS';
/* wrap long lines - don't require user to scroll right */
pre        { line-break: normal; overflow-wrap: normal; white-space: pre-wrap; }

.boring    { color: #999; }
.timestamp { color: #999; }
.log-debug { color: #999; }
.log-info  { color: #333; }
.log-warn  { color: #f60; }
.log-error { color: #900; font-weight: bold; }
.subtest   { background: #eee; }
.subsubtest { color: #F39; font-weight: bold; }
.string    { color: #00c; }
.command   { font-weight: bold; color: #000; }
.changed   { color: #000; font-weight: bold; }

/* links to source files: not as prominent as links to errors */
a.codelink:link    { color: #000; }
a.codelink:visited { color: #666; }
a.codelink:hover   { background: #000; color: #999; }

/* The timing tests at bottom: remove underline, it's too cluttery. */
a.timing           { text-decoration: none; }

/* BATS styles */
.bats-ok        { color: #393; }
.bats-notok     { color: #F00; font-weight: bold; }
.bats-skip      { color: #F90; }
.bats-log       { color: #900; }
.bats-log-esm   { color: #b00; font-weight: bold; }

/* error titles: display next to timestamp, not on separate line */
h2 { display: inline; }
END_CSS

# END   user-customizable section
###############################################################################

###############################################################################
# BEGIN boilerplate args checking, usage messages

sub usage {
    print  <<"END_USAGE";
Usage: $ME [OPTIONS] TEST_NAME

$ME is a filter; it HTMLifies an input stream (presumably
Ginkgo or BATS log results), writing HTML results to an output file
but passing stdin unmodified to stdout. It is intended to run in
the Cirrus CI environment.

Parameters:

    TEST_NAME   descriptive name; output file will be TEST_NAME.log.html

OPTIONS:

  --help         display this message
  --man          display program man page
  --version      display program name and version
END_USAGE

    exit;
}

# Command-line options.  Note that this operates directly on @ARGV !
our $debug   = 0;
our $force   = 0;
our $verbose = 0;
our $NOT     = '';              # print "blahing the blah$NOT\n" if $debug
sub handle_opts {
    use Getopt::Long;
    GetOptions(
        'debug!'     => \$debug,
        'dry-run|n!' => sub { $NOT = ' [NOT]' },
        'force'      => \$force,
        'verbose|v'  => \$verbose,

        help         => \&usage,
        version      => sub { print "$ME version $VERSION\n"; exit 0 },
    ) or die "Try `$ME --help' for help\n";
}

# END   boilerplate args checking, usage messages
###############################################################################

############################## CODE BEGINS HERE ###############################

# The term is "modulino".
__PACKAGE__->main()                                     unless caller();

# Main code.
sub main {
    # Note that we operate directly on @ARGV, not on function parameters.
    # This is deliberate: it's because Getopt::Long only operates on @ARGV
    # and there's no clean way to make it use @_.
    handle_opts();                      # will set package globals

    # In case someone is tempted to run us on the command line
    die "$ME: this is a filter, not an interactive script\n" if -t *STDIN;

    # Fetch command-line arguments.  Barf if too many.
    my $test_name = shift(@ARGV)
        or die "$ME: missing TEST_NAME argument; try $ME --help\n";
    warn "$ME: Too many arguments; ignoring extras. try $ME --help\n" if @ARGV;

    format_log($test_name);
}


sub format_log {
    my $test_name = shift;              # in: e.g. 'integration_test'

    my $outfile = "$test_name.log.html";
    my $out_tmp = "$outfile.tmp.$$";
    open my $out_fh, '>:utf8', $out_tmp
        or warn "$ME: Cannot create $out_tmp: $!\n";

    # Boilerplate: HTML headers for output file
    print { $out_fh } <<"END_HTML"      if $out_fh;
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>$test_name</title>
<style type="text/css">
$CSS
</style>

<!-- on page load, go to bottom: that's where the error summary is -->
<script language="javascript">
function scrollToBottom() {
    if (window.scrollY < 10) {
        window.scrollTo(0, document.body.scrollHeight);
    }
}
window.addEventListener("load", scrollToBottom, false);
</script>
</head>
<body>
<pre>
END_HTML

    # State variables
    my $previous_timestamp = '';  # timestamp of previous line
    my $cirrus_task;              # Cirrus task number, used for linking
    my $git_commit;               # git SHA, used for linking to source files
    my $in_failure;               # binary flag: are we in an error dump?
    my $in_timing;                # binary flag: are we in the timing section?
    my $after_divider = 0;        # Count of lines after seeing '-----'
    my $current_output;           # for removing duplication
    my $looks_like_bats;          # binary flag: for detecting BATS results

    # Main loop: read input, one line at a time, and write out reformatted
  LINE:
    while (my $line = <STDIN>) {
        print $line;                    # Immediately dump back to stdout

        # Remain robust in face of errors: always write stdout even if no HTML
        next LINE if ! $out_fh;

        chomp $line;
        $line =~ s/\0//g;               # Some log files have NULs????
        $line = escapeHTML($line);

        # Temporarily strip off leading timestamp
        $line =~ s/^(\[\+\d+s\]\s)//;
        my $timestamp = $1 || '';
        if ($previous_timestamp && $timestamp eq $previous_timestamp) {
            $timestamp = ' ' x length($timestamp);
        }
        elsif ($timestamp) {
            $previous_timestamp = $timestamp;
        }

        # Try to identify the git commit we're working with...
        if ($line =~ m!libpod/define.gitCommit=([0-9a-f]+)!) {
            $git_commit = $1;
        }
        # ...so we can link to specific lines in source files
        if ($git_commit) {
            #           1  12  3                  34     4 5   526  6
            $line =~ s{^(.*)(\/(containers\/libpod)(\/\S+):(\d+))(.*)$}
                      {$1<a class="codelink" href='https://github.com/$3/blob/$git_commit$4#L$5'>$2</a>$6};
        }

        # Try to identify the cirrus task
        if ($line =~ /cirrus-task-(\d+)/) {
            $cirrus_task = $1;
        }

        # BATS handling
        if ($line =~ /^1\.\.\d+$/) {
            $looks_like_bats = 1;
        }
        if ($looks_like_bats) {
            my $css;

            if    ($line =~ /^ok\s.*\s# skip/) { $css = 'skip'    }
            elsif ($line =~ /^ok\s/)           { $css = 'ok'      }
            elsif ($line =~ /^not\s+ok\s/)     { $css = 'notok'   }
            elsif ($line =~ /^#\s#\|\s/)       { $css = 'log-esm' }
            elsif ($line =~ /^#\s/)            { $css = 'log'     }

            if ($css) {
                $line = "<span class='bats-$css'>$line</span>";
            }

            print { $out_fh } "<span class=\"timestamp\">$timestamp</span>"
                if $timestamp;
            print { $out_fh } $line, "\n";
            next LINE;
        }

        # Timing section at the bottom of the page
        if ($line =~ / timing results\s*$/) {
            $in_timing = 1;
        }
        elsif ($in_timing) {
            if ($line =~ /^(\S.*\S)\s+(\d+\.\d+)\s*$/) {
                my ($name, $time) = ($1, $2);
                my $id = make_id($1, 'timing');

                # Try to column-align the timing numbers. Some test names
                # will be longer than our max - oh well.
                my $spaces = 80 - length(unescapeHTML($name));
                $spaces = 1 if $spaces < 1;
                $spaces++ if $time < 10;
                my $spacing = ' ' x $spaces;
                $line = qq{<a class="timing" href="#t--$id">$name</a>$spacing$time};
            }
            else {
                $in_timing = 0;
            }
        }

        #
        # Ginkgo error reformatting
        #
        if ($line =~ /^.{1,4} (Failure|Panic)( in .*)? \[/) {
            # Begins a block of multiple lines including a stack trace
            print { $out_fh } "<div class='log-error'>\n";
            $in_failure = 1;
        }
        elsif ($line =~ /^-----------/) {
            if ($in_failure) {
                # Ends a stack trace block
                $in_failure = 0;
                print { $out_fh } "</div>\n";
            }
            $after_divider = 1;

            print { $out_fh } "</pre>\n<hr />\n<pre>\n";
            # Always show timestamp at start of each new test
            $previous_timestamp = '';
            next LINE;
        }
        # (bindings test sometimes emits 'Running' with leading bullet char)
        elsif ($line =~ /^•?Running:/) {
            # Highlight the important (non-boilerplate) podman command.
            # Strip out the global podman options, but show them on hover
            $line =~ s{(\S+\/podman)((\s+--(root|runroot|runtime|tmpdir|storage-opt|conmon|cgroup-manager|cni-config-dir|storage-driver|events-backend) \S+)*)(.*)}{
                my ($full_path, $options, $args) = ($1, $2, $5);

                $options =~ s/^\s+//;
                # Separate each '--foo bar' with newlines for readability
                $options =~ s/ --/\n--/g;
                qq{<span title="$full_path"><b>podman</b></span> <span class=\"boring\" title=\"$options\">[options]</span><b>$args</b>};
            }e;
            $current_output = '';
        }
        # Grrr. 'output:' usually just tells us what we already know.
        elsif ($line =~ /^output:/) {
            $current_output =~ s!^\s+|\s+$!!g;  # Trim leading/trailing blanks
            $current_output =~ s/\s+/ /g;       # Collapse multiple spaces
            if ($line eq "output: $current_output" || $line eq 'output: ') {
                next LINE;
            }
        }
        elsif ($line =~ /^Error:/ || $line =~ / level=(warning|error) /) {
            $line = "<span class='log-warn'>" . $line . "</span>";
        }
        elsif ($line =~ /^panic:/) {
            $line = "<span class='log-error'>" . $line . "</span>";
        }
        else {
            $current_output .= ' ' . $line;
        }


        # Two lines after each divider, there's a test name. Make it
        # an anchor so we can link to it later.
        if ($after_divider++ == 2) {
            # Sigh. There is no actual marker. Assume that anything with
            ## two leading spaces then alpha (not slashes) is a test name.
            if ($line =~ /^  [a-zA-Z]/) {
                my $id = make_id($line, 'anchor');

                $line = "<a name='t--$id'><h2>$line</h2></a>";
            }
        }

        # Failure name corresponds to a previously-seen block.
        ## FIXME: sometimes there are three failures with the same name.
        ##        ...I have no idea why or how to link to the right ones.
        #              1  2           2        3             3   14          4
        if ($line =~ /^(\[(Fail|Panic!)\] .* \[(It|BeforeEach)\] )([A-Za-z].*)/) {
            my ($lhs, $type, $ginkgo_fluff, $testname) = ($1, $2, $3, $4);
            my $id = make_id($testname, 'link');

            $line = "<b>$lhs<a href='#t--$id'>$testname</a></b>";
        }

        print { $out_fh } "<span class=\"timestamp\">$timestamp</span>"
            if $timestamp;
        print { $out_fh } $line, "\n";
    }

    my $have_formatted_log;     # Set on success

    if ($out_fh) {
        print { $out_fh } "</pre>\n";

        # Did we find a cirrus task? Link back.
        if ($cirrus_task) {
            print { $out_fh } <<"END_HTML";
<hr />
<h3>Cirrus <a href="https://cirrus-ci.com/task/$cirrus_task">task $cirrus_task</a></h3>
END_HTML
        }

        # FIXME: need a safe way to get TZ
        printf { $out_fh } <<"END_HTML", scalar(CORE::localtime);
<hr />
<small>Processed %s by $ME v$VERSION</small>
</body>
</html>
END_HTML

        if (close $out_fh) {
            if (rename $out_tmp => $outfile) {
                $have_formatted_log = 1;
            }
            else {
                warn "$ME: Could not rename $out_tmp: $!\n";
            }
        }
        else {
            warn "$ME: Error writing $out_tmp: $!\n";
        }
    }

    # FIXME: if Cirrus magic envariables are available, write a link to results
    if ($have_formatted_log && $ENV{CIRRUS_TASK_ID}) {
        my $URL_BASE          = "https://storage.googleapis.com";
        my $STATIC_MAGIC_BLOB = "cirrus-ci-5385732420009984-fcae48";
        my $ARTIFACT_NAME     = "html";

        my $URL = "${URL_BASE}/${STATIC_MAGIC_BLOB}/artifacts/$ENV{CIRRUS_REPO_FULL_NAME}/$ENV{CIRRUS_TASK_ID}/${ARTIFACT_NAME}/${outfile}";

        print "\n\nAnnotated results:\n  $URL\n";
    }
}


#############
#  make_id  #  Given a test name, generate an anchor link name
#############
sub make_id {
    my $name = shift;                   # in: test title
    my $type = shift;                   # in: differentiator (anchor, link)

    state %counter;

    $name =~ s/^\s+|\s+$//g;            # strip leading/trailing whitespace
    $name =~ s/[^a-zA-Z0-9_-]/-/g;      # Convert non-alphanumeric to dash

    # Keep a running tally of how many times we've seen this identifier
    # for this given type! This lets us cross-match, in the bottom of
    # the page, the first/second/third failure of a given test.
    $name .= "--" . ++$counter{$type}{$name};

    $name;
}



sub escapeHTML {
    my $s = shift;

    state %chars;
    %chars = ('&' => '&amp;', '<' => '&lt;', '>' => '&gt;', '"' => '&quot;', "'" => '&#39;')
        if keys(%chars) == 0;
    my $class = join('', sort keys %chars);
    $s =~ s/([$class])/$chars{$1}/ge;

    return $s;
}

sub unescapeHTML {
    my $s = shift;

    # We don't actually care about the character, only its length
    $s =~ s/\&\#?[a-z0-9]+;/./g;

    return $s;
}


1;