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

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

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

  my $path = $self->_metadata_path($time);
  my $asset = Mojo::Asset::File->new;
  $asset->add_chunk($self->app->json->encode($data));
  $asset->move_to($path);

  return 1;
}

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

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

  return $self->app->json->decode($asset->slurp);
}

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) = @_;

  my @syntax = ($self->c(text => ['plaintext', 'markdown']));
  my $langs = $self->app->config->{zerobin}->{syntax};
  push @syntax, $self->c(code => $langs)
    if (ref($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 $paste      = $self->_metadata_load($time);
    $paste->{data} = $self->_content_load($time);
    $paste->{time} = $time;
    utf8::decode($paste->{data});
    $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) = @_;

  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();
    $self->_metadata_save($time, {
      expire => $time + ($expire * 86400),
      syntax => $syntax,
    });
    $self->_content_save($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 $currtime = time();
    my $files = $self->app->home->list_files("data/zerobin");
    foreach my $file (@{ $files }) {
      next unless $file =~ m/^(\d+)\.json$/oi;
      my $time = $1;
      my $data = $self->_metadata_load($time);
      next if $data->{expire} > $currtime; # not yet
      my $date = strftime("%Y-%m-%d %H:%M", localtime($data->{expire}));
      $self->app->log->info("Removing expired paste: $file ($date)");
      unlink $self->_metadata_path($time);
      unlink $self->_content_path($time);
    } 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;