package LDV::Comments;

use strict;
use warnings;
use utf8;

use Mojo::Base 'Mojolicious::Controller';

use Mojo::URL;

sub _gen_id {
  my ($self) = @_;
  my $url = $self->req->param('pageid') ||
            $self->req->headers->referrer;
  my $maxlen = 64;

  return unless $url;
  my $id = Mojo::URL->new($url)->path;

  $id =~ s{^/+}{}o;
  $id =~ s{/+$}{}o;
  $id =~ y{/.}{-}s;
  $id =~ s<\.[a-z0-9]{2,4}$><>io;
  $id = substr($id, -$maxlen, $maxlen);
  $self->app->log->debug("comments id: $id -- $url");

  return $id;
}

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

  my $id = $self->_gen_id
    or die("can't get id\n");
  my $path = $self->app->home->rel_file("data/comments/$id.json");
  return [] unless -f $path;

  open my $FH, '<', $path
    or die("open (r): $path -- $!\n");
  local $/ = undef;
  my $data = <$FH>;
  close $FH;

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

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

  my $id = $self->_gen_id
    or die("can't get id\n");
  my $path = $self->app->home->rel_file("data/comments/$id.json");

  open my $FH, '>', $path
    or die("open (w): $path -- $!\n");
  print $FH $self->app->json->encode($data);
  close $FH;

  return 1;
}

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

  eval {
    my $text = $self->req->param('text')
      or die("empty comment\n");
    my $comments = $self->_comments_load();
    my $comment = {
      text => $text, time => time(),
      user => $self->session('username') || 'anonymous',
    };
    push @{ $comments }, $comment;
    $self->_comments_save($comments);
    $self->render(text => 'OK');
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = 'internal error' if $@ =~ m{line \d+}o;
    $self->res->code(400);
    $self->render(text => $@);
  };

  $self->rendered();
}

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

  eval {
    my $comments = $self->_comments_load();
    die("can't load comments\n")
      unless ref($comments) eq 'ARRAY';
    if (my $count = scalar @{ $comments }) {
      $self->app->log->debug("loaded $count comments");
      $self->stash({comments => $comments});
      $self->render(template => 'comments/list');
    } else {
      $self->render(template => 'comments/none');
    };
  } or do {
    chomp $@;
    $self->app->log->error($@);
    $@ = 'internal error' if $@ =~ m{line \d+}o;
    $self->res->code(400);
    $self->render(text => $@);
  };

  $self->rendered();
}

1;