package LDV::Zerobin;

use strict;
use warnings;
use utf8;

use JSON qw(encode_json decode_json);
use POSIX qw(strftime);
use Mojo::Base 'Mojolicious::Controller';
use Mojo::Asset::File;
use Mojo::Util qw(b64_encode b64_decode decode encode);

sub _paste_path {
  my ($self, $time) = @_;
  my $root ||= $self->app->config->{zerobin}->{root};

  return $self->app->home->rel_file("$root/$time.json");
}

sub create {
  my ($self) = @_;

  my @syntax = ('auto');
  my $langs = $self->app->config->{zerobin}->{syntax};
  push @syntax, $self->c('-------' => $langs)
    if (ref($langs) eq 'ARRAY');

  $self->stash({syntax => \@syntax});
  $self->render();
}

sub view {
  my ($self) = @_;
  my $time = $self->stash('time');

  eval {
    die("paste not found\n") unless ($time);
    my $path = $self->_paste_path($time);
    die("paste not found\n") unless (-f $path);
    my $asset = Mojo::Asset::File->new(path => $path);
    my $json = decode_json($asset->slurp());
    $json->{data} = decode('UTF-8', b64_decode($json->{data}));
    if (time() > $json->{expire}) {
      unlink($path);
      die("paste expired\n");
    }
    $self->stash({paste => $json});
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->flash({'result' => $@});
    $self->redirect_to("/zerobin2");
    return;
  };

  $self->render();
}

sub save {
  my ($self) = @_;

  eval {
    my $expire = $self->req->param('expire') || 30; # 1 month
    my $syntax = $self->req->param('syntax') || '';
    my $paste  = $self->req->param('paste') || '';
    die("empty paste\n") unless $paste;
    $expire = 30     unless ($expire =~ m|^\d+$|o);
    $syntax = 'auto' unless ($syntax =~ m|^[a-z0-9]+$|oi);

    my $time = time();
    my $json = {
      expire => $time + ($expire * 86400),
      syntax => $syntax,
      data   => b64_encode(encode('UTF-8', $paste)),
    };
    my $asset = Mojo::Asset::File->new;
    $asset->add_chunk(encode_json($json));
    $asset->move_to($self->_paste_path($time));
    $self->redirect_to("/zerobin2/$time"); 1;
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->flash({'result' => $@});
    $self->redirect_to("/zerobin2");
  };

  $self->rendered();
  return 1;
}

sub prune {
  my ($self) = @_;

  eval {
    my $time = time();
    my $storage = $self->app->config->{zerobin}->{root};
    my $files = $self->app->home->list_files($storage);
    foreach my $file (@$files) {
      next unless $file =~ m/^(\d+)\.json$/oi;
      my $time = $1;
      my $path = $self->app->home->rel_file("$storage/$file");
      my $asset = Mojo::Asset::File->new(path => $path);
      my $data = decode_json($asset->slurp);
      next if ($data->{expire} > $time); # not yet
      my $date = strftime("%Y-%m-%d %H:%M", localtime($data->{expire}));
      $self->app->log->info("Removing expired paste: $file ($date)");
      unlink $path;
    } 1;
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->stash({'result' => $@});
  };

  $self->redirect_to("/zerobin2");
  $self->rendered();
  return 1;
}

1;