#!/usr/bin/env perl

=pod

=head1 NAME

notes-tag-summary - show a summary of a given tag

=head1 SYNOPSIS

Currently this is vimwiki-dependent.

    # Show tag info for warelogging
    notes-tag-summary warelogging

=head1 AUTHOR

Brennen Bearnes

=cut

use warnings;
use strict;
use 5.10.0;

use Carp;
use Cwd;
use Data::Dumper;
use DBI;
use File::Basename;
use File::Spec;
use Getopt::Long;
use Pod::Usage;
use File::HomeDir;
use Term::ANSIColor;

# Handle options, including help generated from the POD above.
my $debug = 0;
my $use_color = 0;
my $from_filename = 0;
GetOptions(
  'color' => \$use_color,
  'file'  => \$from_filename,
  'debug' => \$debug,
  'help'  => sub { pod2usage(0) },
) or pod2usage(2);

my $tag = $ARGV[0];

unless ($tag) {
  pod2usage(2);
  die;
}

# Pull a tag name out of a path to a wiki page:
if ($from_filename) {
  my ($name, $path, $suffix) = fileparse($tag, '.wiki');
  $tag = $name;
}

my $HOME = File::HomeDir->my_home;
{
  my $dbfile = $HOME . "/notes/metadata.db";
  my $dbh = DBI->connect("dbi:SQLite:dbname=$dbfile", "", "");

  sub query_onerow {
    return query(@_)->fetchrow_hashref();
  }

  sub query {
    my ($query, @bind) = @_;
    my $sth = $dbh->prepare($query);
    $sth->execute(@bind);
    return $sth;
  }
}

sub on_p1k3 {
  state %lines = map { $_ => 1 } file_get_contents_arr(
    File::Spec->catfile($HOME, 'notes', 'p1k3-index')
  );
  my ($tag) = @_;
  return exists $lines{$tag};
}

sub on_pinboard {
  state %lines = map { $_ => 1 } file_get_contents_arr(
    File::Spec->catfile($HOME, 'notes', 'pinboard-tag-index')
  );
  my ($tag) = @_;
  return exists $lines{$tag};
}

sub file_get_contents_arr {
  my ($file) = @_;

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

  chomp(my @lines = <$fh>);

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

  return @lines;
}

sub colorize {
  my ($color) = @_;
  return color(@_) if $use_color;
  return '';
}

# Total count of pages that link to this tag:
my $link_count = query_onerow(
  'SELECT COUNT(*) AS COUNT FROM links WHERE target = ?',
  $tag
)->{COUNT};

# Count of pages that link to this tag and are log entries:
my $log_count = query_onerow(
  'SELECT COUNT(*) AS COUNT FROM links WHERE target = ? AND page LIKE "log/%"',
  $tag
)->{COUNT};

# Head of log for this tag:
my @log_lines;
my $logs_sth = query(
  'SELECT l.page, p.title
     FROM links l JOIN pages p ON l.page = p.page
     WHERE
       l.page LIKE "log/%"
         AND l.target = ?
     LIMIT 10;',
  $tag
);
while (my $row = $logs_sth->fetchrow_hashref()) {
  push @log_lines, $row->{title};
}

# List of pages to display for this tag:
my @display_pages;
my $pages_sth = query(
  'SELECT page FROM links
     WHERE target = ?
           AND page NOT LIKE "log/%"
           AND PAGE NOT LIKE "diary/%"',
  $tag
);
while (my $row = $pages_sth->fetchrow_hashref()) {
  push @display_pages, $row->{page};
}

# XXX: This doesn't quite work, but digikam-extract could be generalized a bit
#      with a little work.

# Photos
# my @photos = `digikam-extract --tag "$tag"`;

# Actual display here:

my $bg = colorize('bold green');
my $reset = colorize('reset');
say "$bg$tag$reset: $link_count links ($log_count log entries)";
print "\n";
say "${bg}pages$reset: " . join ' ', @display_pages;
print "\n";

if (on_pinboard($tag)) {
  say "${bg}on pinboard${reset}";
  print "\n";
}

if (on_p1k3($tag)) {
  say "${bg}topic on p1k3${reset}";
  print "\n";
}

my $wikifile = File::Spec->catfile($HOME, 'notes', 'vimwiki', "$tag.wiki");
if (-f $wikifile) {
  print `head $wikifile`;
} else {
  say "No wiki file found for $tag";
}

print "\n";
if ($log_count > 0) {
  say "${bg}log:${reset}";
  foreach my $line (@log_lines) {
    say "  - $line";
  }
}

# XXX: put photos here
# print "\n";
# if (@photos > 0) {
#   say "${bg}photos:${reset}";
#   foreach my $photo (@photos) {
#     say $photo;
#   }
# }