#!/usr/bin/env perl

=pod

=head1 NAME

pinboard - get some stuff from a pinboard account

=head1 USAGE

F<~/.pinboardrc> must contain a username in the format C<username:token>.

    # Show some recent stuff from today (empty if nothing):
    pinboard

    # List all tags:
    pinboard tags

    # Everything for a specific tag:
    pinboard by-tag some-tag

=head1 DESCRIPTION

A wrapper for some Pinboard API calls I use routinely.

Pretty crap.

=head1 AUTHOR

L<Brennen Bearnes|https://p1k3.com/>

=cut

use strict;
use warnings;

use 5.10.0;

use Carp;
use Data::Dumper;
use File::HomeDir;
use Getopt::Long;
use LWP::Simple;
use Pod::Usage;
use JSON;
use Time::Piece;

use utf8;
use open qw(:std :utf8);

# Handle options, including help generated from the POD above
# (there's nothing else here at the moment, but it's a good place
# to hang things if I want options):
GetOptions(
  'help' => sub { pod2usage(0) },
) or pod2usage(2);

if (defined $ARGV[0] && $ARGV[0] eq 'tags') {
  print tags();
} elsif (defined $ARGV[0] && $ARGV[0] eq 'by-tag') {
  croak "Must supply a tag name"
    unless defined $ARGV[1];
  say format_posts(by_tag($ARGV[1]));
} else {
  my $today = localtime;
  say format_posts(recent($today));
}

sub tags {
  my $token = get_token();

  my $url = 'https://api.pinboard.in/v1/tags/get?format=json&auth_token=' . $token;
  my $pinboard_json = get($url);

  # https://stackoverflow.com/questions/45941522/parsing-utf-8-json-with-perl
  # Strip byte order mark:
  # $pinboard_json =~ s/^\N{BOM}//g;
  $pinboard_json =~ s/^[^\x00-\x7f]+//;

  my $JSON = JSON->new->utf8->pretty;
  my $pinboard_hashref = $JSON->decode($pinboard_json);
  my %tags = %{ $pinboard_hashref };
  my $output = '';
  foreach my $tag (keys %tags) {
    $output .= "$tag\n";
  }
  return $output;
}

sub by_tag {
  my $tag = shift;
  my $token = get_token();

  # lol this is terrible
  my $url = 'https://api.pinboard.in/v1/posts/all?tag='
          . $tag
          . '&format=json&auth_token=' . $token;
  my $pinboard_json = get($url);
  # print $url;
  # print $pinboard_json;
  my $JSON = JSON->new->utf8->pretty;
  my $pinboard_hashref = $JSON->decode($pinboard_json);

  return @{ $pinboard_hashref };
}

sub recent {
  my ($day) = @_;

  my $token = get_token();

  my $url = $day->strftime(
    'https://api.pinboard.in/v1/posts/get?dt=%Y-%m-%d&meta=yes&format=json&auth_token='
    . $token
  );

  my $pinboard_json = get($url);
  my $JSON = JSON->new->utf8->pretty;
  my $pinboard_hashref = $JSON->decode($pinboard_json);
  return @{ $pinboard_hashref->{posts} };
}

# Take a list of posts and format them for display
sub format_posts {
  my @output;
  foreach my $post (@_)
  {
    # push @output, Dumper($post);
    push @output,
         "$post->{time}\t$post->{href}\t$post->{description}\t$post->{tags}";
  }

  if (@output > 0) {
    return join "\n", @output;
  }
  return;
}

# PHP-style file-content grabbing:
sub file_get_contents {
  my ($file) = @_;

  open my $fh, '<', $file
    or croak "Couldn't open $file: $!\n";

  my $contents;
  {
    # line separator:
    local $/ = undef;
    $contents = <$fh>;
  }

  close $fh or croak "Couldn't close $file: $!";

  return $contents;
}

sub get_token {
  # See the bit about auth here:
  # https://pinboard.in/api/
  my $home = File::HomeDir->my_home;
  my $rc_path = "${home}/.pinboardrc";
  my $token;
  if (-e $rc_path) {
    $token = file_get_contents($rc_path);
  } else {
    die("No $rc_path found - do you need to create a file with credentials?");
  }
  chomp($token);

  return $token;
}