package LDV::Zerobin;

use strict;
use warnings;
use utf8;

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

sub _content_path {
  my ($self, $time) = @_;

  return $self->app->home->rel_file("public/zerobin/$time.txt");
}

sub _content_save {
  my ($self, $time, $content) = @_;

  unless (ref $content) {
    my $asset = Mojo::Asset::File->new;
    utf8::encode($content);
    $asset->add_chunk($content);
    $content = $asset; # wrap plaintext to Mojo::Asset
  }
  my $path = $self->_content_path($time);
  $content->move_to($path);

  return 1;
}

sub _content_load {
  my ($self, $time) = @_;

  my $path = $self->_content_path($time);
  die("paste content not found\n") unless (-f $path);
  my $asset = Mojo::Asset::File->new(path => $path);
  $asset->cleanup(0);
  my $content = $asset->slurp;
  utf8::decode($content);

  return $content;
}

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

  $self->access_allowed($self->app->config->{zerobin}->{access})
    or return;

  my @syntax = qw(auto);
  my $syntax = [ @{ $self->app->config->{zerobin}->{syntax} } ];
  while (my ($cat, $list) = splice(@{ $syntax }, 0, 2)) {
    next unless $cat and ref($list) and ref($list) eq 'ARRAY';
    push @syntax, $self->c($cat => $list);
  }

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

sub view {
  my ($self) = @_;
  my $time = $self->stash('time') || 0;

  eval {
    my $paste = $self->app->db->select('zerobin', '*', {created => $time})->hash;
    die("paste not found\n") unless $paste;
    $paste->{data} = $self->_content_load($paste->{created});
    $self->stash({paste => $paste}); 1;
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->flash({'result' => $@});
    $self->redirect_to("/zerobin");
    return;
  };

  $self->render;
}

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

  $self->access_allowed($self->app->config->{zerobin}->{access})
    or return;

  eval {
    my $source = $self->req->param('source') || '-';
    my $expire = $self->req->param('expire') || 30; # 30 days or 1 month
    my $syntax = $self->req->param('syntax') || '';
    my $paste;
    if ($source eq 'form') {
      $paste = $self->req->param('paste') || '';
      die("empty paste\n") unless $paste;
    } elsif ($source eq 'file') {
      require File::MimeInfo::Magic;
      my $tmpfile = tmpnam();
      my $maxsize = $self->app->config->{zerobin}->{maxsize};
      my $upload = $self->req->upload('file');
      die("empty uploaded file\n")
        if $upload->size == 0;
      die("uploaded file too large\n")
        if $upload->size > $maxsize;
      $upload->move_to($tmpfile);
      $upload->asset->cleanup(1)
        if $upload->asset->SUPER::can('cleanup');
      my $mime = File::MimeInfo::Magic::mimetype($tmpfile);
      die("uploaded file not looks like text\n")
        unless $mime =~ m{^text/};
      $paste = $upload->asset;
      unlink $tmpfile;
    } else {
      die("unknown 'source'\n");
    }
    $expire = 30     unless ($expire =~ m|^\d+$|o);
    $syntax = 'auto' unless ($syntax =~ m|^[a-z0-9]+$|oi);

    my $time = time();
    $self->app->db->insert('zerobin', {
      created => $time, syntax => $syntax,
      expire  => $time + ($expire * 86400),
    });
    $self->_content_save($time, $paste);
    $self->redirect_to("/zerobin/$time"); 1;
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->flash({'result' => $@});
    $self->redirect_to("/zerobin");
  };

  $self->rendered;
}

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

  eval {
    my @expired = $self->app->db->select('zerobin', '*', {expire => {'<=' => time()}})->hashes;
    foreach my $paste (@expired) {
      my $path = $self->_content_path($paste->{created});
      $self->app->log->info("Removing expired paste: $path");
      unlink $path if -f $path;
      $self->app->db->delete('zerobin', {id => $paste->{id}});
    }
    my $msg = sprintf '%d records pruned', scalar @expired;
    $self->app->log->info($msg); 1;
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = "internal error" if ($@ =~ m|at \S+ line \d+|oi);
    $self->stash({result => $@});
  };

  $self->redirect_to("/zerobin");
  $self->rendered;
}

1;