#!/usr/bin/env perl

=pod

=head1 NAME

timeslice - aggregate CLI history, notes, blog entries, etc. for a given time

=head1 SYNOPSIS

    # Find items for January 1st, 2019:
    timeslice 2019-01-01

    # Find items corresponding to a file's time - special cases some files
    # with an embedded date, like a blog entry or a vimwiki diary page,
    # otherwise falls back to mtime:
    timeslice --file ~/notes/vimwiki/diary/2019-01-02.wiki
    timeslice --file ~/screenshots/foo.png

=head1 DESCRIPTION

timeslice is a utility, for now extremely specific to my personal setup, for
aggregating info from various systems by date.  It currently looks up entries
in vimwiki, L<p1k3|https://p1k3.com/> (my blog), Pinboard bookmarks, command
line history using
L<commandlog|https://code.p1k3.com/gitea/brennen/commandlog>, and commits in
git repos registered with myrepos.

This code is hot garbage.

=head1 AUTHOR

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

=cut

use warnings;
use strict;

use 5.10.0;

# This seems to be necessary to print UTF-8 without warnings:
use open ':std', ':encoding(UTF-8)';

use Carp;
use Data::Dumper;
use Encode qw(decode encode);
use File::Basename;
use File::Find;
use File::HomeDir;
use File::Spec;
use Getopt::Long;
use JSON;
use LWP::Simple;
use Pod::Usage;
use Text::Wrap;
use Time::Piece;
use Time::Seconds;

$Text::Wrap::columns = 72;
my $ISO_8601_FMT = '%Y-%m-%d';

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

# If --file was invoked, get time from targetted file instead of taking
# the first param as a date:
my %dates;
if ($date_from_file) {
  my $file = File::Spec->rel2abs($ARGV[0]);
  say "Date from file: $file";

  if ($file =~ m{^.*?/diary/(\d{4}-\d{2}-\d{2})[.]wiki$}) {
    # Handle vimwiki diary entries:
    $dates{$1} .= '(vimwiki)';
  } elsif ($file =~ m{^.*?/p1k3/archives/(\d{4})/(\d+)/(\d+)(/index)?$}) {
    # Handle p1k3 entries:
    $dates{ sprintf('%d-%02d-%02d', $1, $2, $3) } .= "(p1k3)";
  }

  # Just use the file's modification time:
  $dates{ get_mtime_day($ARGV[0]) } .= "(mtime)";

  my $git_date = git_commit_date($file);
  if ($git_date) {
    # Handle git commit dates:
    $dates{ $git_date } .= "(git commit)";
  }
} else {
  $dates{ $ARGV[0] } .= "(arg)";
}

foreach my $date (keys %dates) {
  unless ($date =~ m/\d+-\d+-\d+/) {
    say "invalid date: $date";
    next;
  }
  my $day = Time::Piece->strptime($date, $ISO_8601_FMT);
  print_day_slice($day, $dates{$date});
}

sub print_day_slice {
  my ($day, $label) = @_;
  my $next_day = $day + ONE_DAY;

  say "${day} ${label} {{{";

  print_section('p1k3',     p1k3($day));
  print_section('vimwiki',  vimwiki($day));
  print_section('shell',    commandlog($day, $next_day));
  print_section('pinboard', pinboard($day));
  print_section('myrepos',  myrepos($day, $next_day));

  say "}}}";
}

sub print_section {
  my ($title, @content) = @_;
  return unless defined $content[0];

  say "${title} {{{";
  foreach my $thing (@content) {
    say $thing;
  }
  say "}}}";
}

sub commandlog {
  my ($day, $next_day) = @_;
  my $after = $day->strftime('%Y-%m-%d 00:00:00');
  my $before = $next_day->strftime('%Y-%m-%d 00:00:00');
  my (@cl_lines) = `commandlog log --after="${after}" --before="${before}"`;
  if (@cl_lines > 1) {
    return join "", @cl_lines;
  }
  return;
}

sub myrepos {
  my ($day, $next_day) = @_;
  my $after = $day->strftime('%Y-%m-%d 00:00:00');
  my $before = $next_day->strftime('%Y-%m-%d 00:00:00');
  my (@mr_lines) = `cd ~ && mr -m log --stat --since="${after}" --before="${before}" 2>&1`;
  if (@mr_lines > 1) {
    return join "", @mr_lines;
  }
  return;
}

sub p1k3 {
  my ($day) = @_;
  my $daypath = $day->strftime(
    "%Y/%-m/%-d"
  );
  if (-e File::HomeDir->my_home . '/p1k3/archives/' . $daypath) {
    return join "", `cd ~/p1k3 && wrt display ${daypath} | lynx -stdin -dump`
  }
  return;
}

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

  # See the bit about auth here:
  # https://pinboard.in/api/
  my $home = File::HomeDir->my_home;
  my $token = file_get_contents("${home}/.pinboardrc");
  chomp($token);

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

  my $pinboard_json = `curl -s '${url}'`;
  my $JSON = JSON->new->utf8->pretty;
  my $pinboard_hashref = $JSON->decode($pinboard_json);
  my @posts = @{ $pinboard_hashref->{posts} };

  my @output;
  # my @output = (
  #   "source: curl -s -K ${home}/.pinboardrc '${url}'"
  # );
  foreach my $post (@posts)
  {
    my $display = wrap("", "", $post->{description}) . "\n"
      if length($post->{description});

    $display .= wrap("\t", "\t", $post->{extended}) . "\n"
      if length($post->{extended});

    $display .= "\t" . $post->{href} . "\n";

    $display .= wrap("\t", "\t", $post->{tags}) . "\n"
      if length($post->{tags});

    push @output, $display;
  }

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

sub vimwiki {
  my ($day) = @_;
  my $daypath = $day->strftime(
    File::HomeDir->my_home . "/notes/vimwiki/diary/%Y-%m-%d.wiki"
  );
  if (-e $daypath) {
    return ("source: $daypath", file_get_contents($daypath));
  }
}

# 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: $!";

  # TODO: _May_ want to assume here that any file is UTF-8 text.
  # http://perldoc.perl.org/perlunitut.html
  # return decode('UTF-8', $contents);
  return $contents;
}

# Horked from WRT::Date.
sub get_mtime_day
{
  use POSIX qw(strftime);
  my ($file) = @_;

  # my( $dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size,
  #     $atime, $mtime, $ctime, $blksize, $blocks )
  #   = stat( $filename );

  my $mtime = (stat $file)[9];
  # return strftime("%Y-%m-%dT%H:%M:%SZ", localtime($mtime));
  return strftime("%Y-%m-%d", localtime($mtime));
}

# Get a commit date for a given path:
sub git_commit_date {
  my ($path) = @_;
  my $dirname = dirname($path);
  say $path;

  if (in_git_worktree($path)) {
    my ($git_output) = `cd ${dirname} && git log -1 --format=%ci "${path}"`;
    my ($date) = $git_output =~ m/^(\d{4}-\d{2}-\d{2}).*$/;

    if ($date) {
      return $date;
    }
  }
  return;
}

# Is a given path in a git working tree?
sub in_git_worktree {
  my ($path) = @_;
  my $dirname = dirname($path);

  return 0 unless -d "$dirname/.git";

  my ($git_check) = `cd "${dirname}" && git rev-parse --is-inside-work-tree`;
  if (defined $git_check) {
    chomp($git_check);
    return 1 if $git_check eq 'true';
  }
  return 0;
}