#!perl

use warnings;
use strict;
use 5.014;

use bytes ();

use File::Slurp;
use Getopt::Long;
use Time::HiRes qw/ gettimeofday tv_interval /;

use IO::Compress::Brotli;
use IO::Uncompress::Brotli;

GetOptions(
    'd|decompress'          => \(my $DECOMPRESS),
    'f|force'               => \(my $FORCE),
    'h|help'                => \(my $HELP),
    'i|input=s'             => \(my $INPUT),
    'o|output=s'            => \(my $OUTPUT),
    'q|quality=i'           => \(my $QUALITY = 11),
    'r|repeat=i'            => \(my $REPEAT = 1),
    's|stream=i'            => \(my $STREAM),
    'v|verbose'             => \(my $VERBOSE),
    'w|window=i'            => \(my $WINDOW = 22),
);

if( $HELP ) {
    say "Usage: $0 [--force] [--quality n] [--decompress] [--input filename] [--output filename]".
        " [--repeat iters] [--verbose] [--window n] [--stream size]";
    exit 1;
}

if( $REPEAT > 1 && !($INPUT && $OUTPUT) ) {
    say "You can only run a benchmark on files specifying --input and --output";
    exit 1;
}

my $t0 = [gettimeofday];
my $total_size = 0;
my ($encoded, $decoded);

for ( 1..$REPEAT ) {
    my $ifh;
    if( $INPUT ) {
        open $ifh, "<", $INPUT
            or die "Cannot open input file $INPUT.\n";
    }
    $ifh //= \*STDIN;
    binmode $ifh;

    my $ofh;
    if( $OUTPUT ) {
        die "Output file exists\n"
            if( -e $OUTPUT && $REPEAT == 1 && !$FORCE );
        open $ofh, ">", $OUTPUT
            or die "Cannot open output file $OUTPUT.\n";
    }
    $ofh //= \*STDOUT;
    binmode $ofh;

    if( $DECOMPRESS ) {
        $STREAM //= 4 * 1024 * 1024;
        my $bro = IO::Uncompress::Brotli->create();
        while( read $ifh, (my $buf), $STREAM ) {
            $decoded = $bro->decompress($buf);
            $total_size += bytes::length( $decoded );
            print $ofh $decoded;
        }
    }
    else {
        if( $STREAM ) {
            my $bro = IO::Compress::Brotli->create();
            $bro->quality( $QUALITY );
            $bro->window( $WINDOW );
            while( read $ifh, (my $buf), $STREAM ) {
                $encoded = $bro->compress($buf);
                $total_size += bytes::length( $buf );
                print $ofh $encoded;
            }
            $encoded = $bro->finish();
            print $ofh $encoded;
        }
        else {
            my $decoded = read_file( $ifh );
            my $encoded = bro( $decoded, $QUALITY, $WINDOW );
            $total_size += bytes::length( $decoded );
            write_file( $ofh, $encoded );
        }
    }
}

if( $VERBOSE ) {
    my $elapsed = tv_interval ( $t0 );
    say "Ran $REPEAT iterations in a total of $elapsed seconds";
    say sprintf(
        "Brotli %s speed: %.6f MB/s",
        ( $DECOMPRESS ? "decompression" : "compression" ),
        $total_size / 1024 / 1024 / $elapsed
    );
}