# File: RegistryCommands.pm
# Author: pragma_
#
# Purpose: Commands to introspect and update Registry

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

package PBot::RegistryCommands;

use warnings;
use strict;

use feature 'unicode_strings';

use Carp ();

sub new {
  if (ref($_[1]) eq 'HASH') {
    Carp::croak("Options to " . __FILE__ . " should be key/value pairs, not hash reference");
  }

  my ($class, %conf) = @_;
  my $self = bless {}, $class;
  $self->initialize(%conf);
  return $self;
}

sub initialize {
  my ($self, %conf) = @_;

  my $pbot = delete $conf{pbot} // Carp::croak("Missing pbot reference to " . __FILE__);
  $self->{pbot} = $pbot;

  $pbot->{commands}->register(sub { return $self->regset(@_)         }, "regset",       60);
  $pbot->{commands}->register(sub { return $self->regunset(@_)       }, "regunset",     60);
  $pbot->{commands}->register(sub { return $self->regshow(@_)        }, "regshow",       0);
  $pbot->{commands}->register(sub { return $self->regsetmeta(@_)     }, "regsetmeta",   60);
  $pbot->{commands}->register(sub { return $self->regunsetmeta(@_)   }, "regunsetmeta", 60);
  $pbot->{commands}->register(sub { return $self->regchange(@_)      }, "regchange",    60);
  $pbot->{commands}->register(sub { return $self->regfind(@_)        }, "regfind",       0);
}

sub regset {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments, $stuff) = @_;

  my $usage = "Usage: regset <section>.<item> <value>";

  # support "<section>.<key>" syntax in addition to "<section> <key>"
  my $section = $self->{pbot}->{interpreter}->shift_arg($stuff->{arglist}) // return $usage;
  my ($item, $value);
  if ($section =~ m/^(.+?)\.(.+)$/) {
    ($section, $item) = ($1, $2);
    ($value) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 1);
  } else {
    ($item, $value) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 2);
  }

  if (not defined $section or not defined $item or not defined $value) {
    return $usage;
  }

  $self->{pbot}->{registry}->add('text', $section, $item, $value);

  $self->{pbot}->{logger}->log("$nick!$user\@$host set registry entry [$section] $item => $value\n");
  return "$section.$item set to $value";
}

sub regunset {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments, $stuff) = @_;

  my $usage = "Usage: regunset <section>.<item>";

  # support "<section>.<key>" syntax in addition to "<section> <key>"
  my $section = $self->{pbot}->{interpreter}->shift_arg($stuff->{arglist}) // return $usage;
  my $item;
  if ($section =~ m/^(.+?)\.(.+)$/) {
    ($section, $item) = ($1, $2);
  } else {
    ($item) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 1);
  }

  if (not defined $section or not defined $item) {
    return $usage;
  }

  if (not exists $self->{pbot}->{registry}->{registry}->hash->{$section}) {
    return "No such registry section $section.";
  }

  if (not exists $self->{pbot}->{registry}->{registry}->hash->{$section}->{$item}) {
    return "No such item $item in section $section.";
  }

  $self->{pbot}->{logger}->log("$nick!$user\@$host removed registry entry $section.$item\n");
  $self->{pbot}->{registry}->remove($section, $item);
  return "$section.$item deleted from registry";
}

sub regsetmeta {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments, $stuff) = @_;

  my $usage = "Usage: regsetmeta <section>.<item> [key [value]]";

  # support "<section>.<key>" syntax in addition to "<section> <key>"
  my $section = $self->{pbot}->{interpreter}->shift_arg($stuff->{arglist}) // return $usage;
  my ($item, $key, $value);
  if ($section =~ m/^(.+?)\.(.+)$/) {
    ($section, $item) = ($1, $2);
    ($key, $value) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 2);
  } else {
    ($item, $key, $value) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 3);
  }

  if (not defined $section or not defined $item) {
    return $usage;
  }

  $key = undef if not length $key;
  $value = undef if not length $value;

  return $self->{pbot}->{registry}->set($section, $item, $key, $value);
}

sub regunsetmeta {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments, $stuff) = @_;

  my $usage = "Usage: regunsetmeta <section>.<item> <key>";

  # support "<section>.<key>" syntax in addition to "<section> <key>"
  my $section = $self->{pbot}->{interpreter}->shift_arg($stuff->{arglist}) // return $usage;
  my ($item, $key);
  if ($section =~ m/^(.+?)\.(.+)$/) {
    ($section, $item) = ($1, $2);
    ($key) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 1);
  } else {
    ($item, $key) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 2);
  }

  if (not defined $section or not defined $item or not defined $key) {
    return $usage;
  }

  return $self->{pbot}->{registry}->unset($section, $item, $key);
}

sub regshow {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments, $stuff) = @_;
  my $registry = $self->{pbot}->{registry}->{registry}->hash;

  my $usage = "Usage: regshow <section>.<item>";

  # support "<section>.<key>" syntax in addition to "<section> <key>"
  my $section = $self->{pbot}->{interpreter}->shift_arg($stuff->{arglist}) // return $usage;
  my $item;
  if ($section =~ m/^(.+?)\.(.+)$/) {
    ($section, $item) = ($1, $2);
  } else {
    ($item) = $self->{pbot}->{interpreter}->split_args($stuff->{arglist}, 1);
  }

  if (not defined $section or not defined $item) {
    return $usage;
  }

  if (not exists $registry->{$section}) {
    return "No such registry section $section.";
  }

  if (not exists $registry->{$section}->{$item}) {
    return "No such registry item $item in section $section.";
  }

  if ($registry->{$section}->{$item}->{private}) {
    return "$section.$item: <private>";
  }

  my $result = "$section.$item: $registry->{$section}->{$item}->{value}";

  if ($registry->{$section}->{$item}->{type} eq 'array') {
    $result .= ' [array]';
  }

  return $result;
}

sub regfind {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments) = @_;
  my $registry = $self->{pbot}->{registry}->{registry}->hash;

  my $usage = "Usage: regfind [-showvalues] [-section section] <regex>";

  if (not defined $arguments) {
    return $usage;
  }

  my ($section, $showvalues);

  $section = $1 if $arguments =~ s/-section\s+([^\b\s]+)//i;
  $showvalues = 1 if $arguments =~ s/-showvalues//i;

  $arguments =~ s/^\s+//;
  $arguments =~ s/\s+$//;
  $arguments =~ s/\s+/ /g;

  if ($arguments eq "") {
    return $usage;
  }

  my ($text, $last_item, $last_section, $i);
  $last_section = "";
  $i = 0;
  eval {
    use re::engine::RE2 -strict => 1;
    foreach my $section_key (sort keys %{ $registry }) {
      next if defined $section and $section_key !~ /^$section$/i;
      foreach my $item_key (sort keys %{ $registry->{$section_key} }) {
        if ($registry->{$section_key}->{$item_key}->{private}) {
          # do not match on value if private
          next if $item_key !~ /$arguments/i;
        } else {
          next if $registry->{$section_key}->{$item_key}->{value} !~ /$arguments/i and $item_key !~ /$arguments/i;
        }

        $i++;

        if ($section_key ne $last_section) {
          $text .= "[$section_key]\n";
          $last_section = $section_key;
        }
        if ($showvalues) {
          if ($registry->{$section_key}->{$item_key}->{private}) {
            $text .= "  $item_key = <private>\n";
          } else {
            $text .= "  $item_key = $registry->{$section_key}->{$item_key}->{value}" . ($registry->{$section_key}->{$item_key}->{type} eq 'array' ? " [array]\n" : "\n");
          }
        } else {
          $text .= "  $item_key\n";
        }
        $last_item = $item_key;
      }
    }
  };

  return "/msg $nick $arguments: $@" if $@;

  if ($i == 1) {
    chop $text;
    if ($registry->{$last_section}->{$last_item}->{private}) {
      return "Found one registry entry: [$last_section] $last_item: <private>";
    } else {
      return "Found one registry entry: [$last_section] $last_item: $registry->{$last_section}->{$last_item}->{value}" . ($registry->{$last_section}->{$last_item}->{type} eq 'array' ? ' [array]' : '');
    }
  } else {
    return "Found $i registry entries:\n$text" unless $i == 0;

    my $sections = (defined $section ? "section $section" : 'any sections');
    return "No matching registry entries found in $sections.";
  }
}

sub regchange {
  my $self = shift;
  my ($from, $nick, $user, $host, $arguments) = @_;
  my ($section, $item, $delim, $tochange, $changeto, $modifier);

  if (defined $arguments) {
    if ($arguments =~ /^(.+?)\.([^\s]+)\s+s(.)/ or $arguments =~ /^([^\s]+) ([^\s]+)\s+s(.)/) {
      $section = $1;
      $item = $2;
      $delim = $3;
    }

    if ($arguments =~ /$delim(.*?)$delim(.*)$delim(.*)?$/) {
      $tochange = $1;
      $changeto = $2;
      $modifier  = $3;
    }
  }

  if (not defined $section or not defined $item or not defined $changeto) {
    return "Usage: regchange <section>.<item> s/<pattern>/<replacement>/";
  }

  my $registry = $self->{pbot}->{registry}->{registry}->hash;

  if (not exists $registry->{$section}) {
    return "No such registry section $section.";
  }

  if (not exists $registry->{$section}->{$item}) {
    return "No such registry item $item in section $section.";
  }

  my $ret = eval {
    use re::engine::RE2 -strict => 1;
    if (not $registry->{$section}->{$item}->{value} =~ s|$tochange|$changeto|) {
      $self->{pbot}->{logger}->log("($from) $nick!$user\@$host: failed to change $section.$item 's$delim$tochange$delim$changeto$delim$modifier\n");
      return "/msg $nick Change $section.$item failed.";
    } else {
      $self->{pbot}->{logger}->log("($from) $nick!$user\@$host: changed $section.$item 's/$tochange/$changeto/\n");
      $self->{pbot}->{registry}->process_trigger($section, $item, 'value', $registry->{$section}->{$item}->{value});
      $self->{pbot}->{registry}->save;
      return "$section.$item set to $registry->{$section}->{$item}->{value}";
    }
  };
  return "/msg $nick Failed to change $section.$item: $@" if $@;
  return $ret;
}

1;