# File: ChanOps.pm
# Author: pragma_
#
# Purpose: Provides channel operator status tracking and commands.

# 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::ChanOps;

use warnings;
use strict;

use feature 'unicode_strings';

use PBot::ChanOpCommands;
use Time::HiRes qw(gettimeofday);

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) = @_;

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

  $self->{unban_timeout} = PBot::DualIndexHashObject->new(
    pbot => $self->{pbot},
    name => 'Unban Timeouts',
    filename => $self->{pbot}->{registry}->get_value('general', 'data_dir') . '/unban_timeouts'
  );

  $self->{unban_timeout}->load;

  $self->{unmute_timeout} = PBot::DualIndexHashObject->new(
    pbot => $self->{pbot},
    name => 'Unmute Timeouts',
    filename => $self->{pbot}->{registry}->get_value('general', 'data_dir') . '/unmute_timeouts'
  );

  $self->{unmute_timeout}->load;

  $self->{ban_queue} = {};
  $self->{unban_queue} = {};

  $self->{op_commands} = {};
  $self->{is_opped} = {};
  $self->{op_requested} = {};

  $self->{commands} = PBot::ChanOpCommands->new(pbot => $self->{pbot});

  $self->{pbot}->{registry}->add_default('text', 'general', 'deop_timeout', 300);

  $self->{pbot}->{timer}->register(sub { $self->check_opped_timeouts  }, 10);
  $self->{pbot}->{timer}->register(sub { $self->check_unban_timeouts  }, 10);
  $self->{pbot}->{timer}->register(sub { $self->check_unmute_timeouts }, 10);
  $self->{pbot}->{timer}->register(sub { $self->check_unban_queue     }, 30);
}

sub can_gain_ops {
  my ($self, $channel) = @_;
  $channel = lc $channel;
  return exists $self->{pbot}->{channels}->{channels}->hash->{$channel}
  && $self->{pbot}->{channels}->{channels}->hash->{$channel}{chanop}
  && $self->{pbot}->{channels}->{channels}->hash->{$channel}{enabled};
}

sub gain_ops {
  my $self = shift;
  my $channel = shift;
  $channel = lc $channel;

  return if exists $self->{op_requested}->{$channel};
  return if not $self->can_gain_ops($channel);

  my $op_nick = $self->{pbot}->{registry}->get_value($channel, 'op_nick') //
    $self->{pbot}->{registry}->get_value('general', 'op_nick') // 'chanserv';

  my $op_command = $self->{pbot}->{registry}->get_value($channel, 'op_command') //
    $self->{pbot}->{registry}->get_value('general', 'op_command') // "op $channel";

  $op_command =~ s/\$channel\b/$channel/g;

  if (not exists $self->{is_opped}->{$channel}) {
    $self->{pbot}->{conn}->privmsg($op_nick, $op_command);
    $self->{op_requested}->{$channel} = scalar gettimeofday;
  } else {
    $self->perform_op_commands($channel);
  }
}

sub lose_ops {
  my $self = shift;
  my $channel = shift;
  $channel = lc $channel;
  $self->{pbot}->{conn}->mode($channel, '-o ' . $self->{pbot}->{registry}->get_value('irc', 'botnick'));
}

sub add_op_command {
  my ($self, $channel, $command) = @_;
  $channel = lc $channel;
  return if not $self->can_gain_ops($channel);
  push @{ $self->{op_commands}->{$channel} }, $command;
}

sub perform_op_commands {
  my $self = shift;
  my $channel = shift;
  $channel = lc $channel;
  my $botnick = $self->{pbot}->{registry}->get_value('irc', 'botnick');

  $self->{pbot}->{logger}->log("Performing op commands...\n");
  while (my $command = shift @{ $self->{op_commands}->{$channel} }) {
    if ($command =~ /^mode (.*?) (.*)/i) {
      $self->{pbot}->{conn}->mode($1, $2);
      $self->{pbot}->{logger}->log("  executing mode [$1] [$2]\n");
    } elsif ($command =~ /^kick (.*?) (.*?) (.*)/i) {
      $self->{pbot}->{conn}->kick($1, $2, $3) unless $1 =~ /\Q$botnick\E/i;
      $self->{pbot}->{logger}->log("  executing kick on $1 $2 $3\n");
    }
  }
  $self->{pbot}->{logger}->log("Done.\n");
}

sub ban_user {
  my $self = shift;
  my ($mask, $channel, $immediately) = @_;

  $self->add_to_ban_queue($channel, 'b', $mask);

  if (not defined $immediately or $immediately != 0) {
    $self->check_ban_queue;
  }
}

sub get_bans {
  my ($self, $mask, $channel) = @_;
  my $masks;

  if ($mask !~ m/[!@\$]/) {
    my ($message_account, $hostmask) = $self->{pbot}->{messagehistory}->{database}->find_message_account_by_nick($mask);

    if (defined $hostmask) {
      my $nickserv = $self->{pbot}->{messagehistory}->{database}->get_current_nickserv_account($message_account);
      $masks = $self->{pbot}->{bantracker}->get_baninfo($hostmask, $channel, $nickserv);
    }

    my %akas = $self->{pbot}->{messagehistory}->{database}->get_also_known_as($mask);

    foreach my $aka (keys %akas) {
      next if $akas{$aka}->{type} == $self->{pbot}->{messagehistory}->{database}->{alias_type}->{WEAK};
      next if $akas{$aka}->{nickchange} == 1;

      my $b = $self->{pbot}->{bantracker}->get_baninfo($aka, $channel);
      if (defined $b) {
        $masks = {} if not defined $masks;
        push @$masks,  @$b;
      }
    }
  }

  return $masks
}

sub unmode_user {
  my ($self, $mask, $channel, $immediately, $mode) = @_;

  $mask = lc $mask;
  $channel = lc $channel;
  $self->{pbot}->{logger}->log("Removing mode $mode from $mask in $channel\n");

  my $bans = $self->get_bans($mask, $channel);
  my %unbanned;

  if (not defined $bans) {
    my $baninfo = {};
    $baninfo->{banmask} = $mask;
    $baninfo->{type} = '+' . $mode;
    push @$bans, $baninfo;
  }

  foreach my $baninfo (@$bans) {
    next if $baninfo->{type} ne '+' . $mode;
    next if exists $unbanned{$baninfo->{banmask}};
    $unbanned{$baninfo->{banmask}} = 1;
    $self->add_to_unban_queue($channel, $mode, $baninfo->{banmask});
  }

  $self->check_unban_queue if $immediately;
}

sub nick_to_banmask {
  my ($self, $mask) = @_;

  if ($mask !~ m/[!@\$]/) {
    my ($message_account, $hostmask) = $self->{pbot}->{messagehistory}->{database}->find_message_account_by_nick($mask);
    if (defined $hostmask) {
      my $nickserv = $self->{pbot}->{messagehistory}->{database}->get_current_nickserv_account($message_account);
      if (defined $nickserv && length $nickserv) {
        $mask = '$a:' . $nickserv;
      } else {
        my ($nick, $user, $host) = $hostmask =~ m/([^!]+)!([^@]+)@(.*)/;
        $mask = "*!$user\@" . PBot::AntiFlood::address_to_mask($host);
      }
    } else {
      $mask .= '!*@*';
    }
  }
  return $mask;
}

sub unban_user {
  my ($self, $mask, $channel, $immediately) = @_;
  $mask = lc $mask;
  $channel = lc $channel;
  $self->{pbot}->{logger}->log("Unbanning $channel $mask\n");
  $self->unmode_user($mask, $channel, $immediately, 'b');
}

sub ban_user_timed {
  my $self = shift;
  my ($owner, $reason, $mask, $channel, $length, $immediately) = @_;

  $channel = lc $channel;
  $mask = lc $mask;

  $mask = $self->nick_to_banmask($mask);
  $self->ban_user($mask, $channel, $immediately);

  if ($length > 0) {
    $self->{unban_timeout}->hash->{$channel}->{$mask}{timeout} = gettimeofday + $length;
    $self->{unban_timeout}->hash->{$channel}->{$mask}{owner} = $owner if defined $owner;
    $self->{unban_timeout}->hash->{$channel}->{$mask}{reason} = $reason if defined $reason;
    $self->{unban_timeout}->save;
  } else {
    if ($self->{pbot}->{chanops}->{unban_timeout}->find_index($channel, $mask)) {
      $self->{pbot}->{chanops}->{unban_timeout}->remove($channel, $mask);
    }
  }
}

sub mute_user {
  my $self = shift;
  my ($mask, $channel, $immediately) = @_;

  $self->add_to_ban_queue($channel, 'q', $mask);

  if (not defined $immediately or $immediately != 0) {
    $self->check_ban_queue;
  }
}

sub unmute_user {
  my ($self, $mask, $channel, $immediately) = @_;
  $mask = lc $mask;
  $channel = lc $channel;
  $self->{pbot}->{logger}->log("Unmuting $channel $mask\n");
  $self->unmode_user($mask, $channel, $immediately, 'q');
}

sub mute_user_timed {
  my $self = shift;
  my ($owner, $reason, $mask, $channel, $length, $immediately) = @_;

  $channel = lc $channel;
  $mask = lc $mask;

  $mask = $self->nick_to_banmask($mask);
  $self->mute_user($mask, $channel, $immediately);

  if ($length > 0) {
    $self->{unmute_timeout}->hash->{$channel}->{$mask}{timeout} = gettimeofday + $length;
    $self->{unmute_timeout}->hash->{$channel}->{$mask}{owner} = $owner if defined $owner;
    $self->{unmute_timeout}->hash->{$channel}->{$mask}{reason} = $reason if defined $reason;
    $self->{unmute_timeout}->save;
  } else {
    if ($self->{pbot}->{chanops}->{unmute_timeout}->find_index($channel, $mask)) {
      $self->{pbot}->{chanops}->{unmute_timeout}->remove($channel, $mask);
    }
  }
}

sub join_channel {
  my ($self, $channels) = @_;

  $self->{pbot}->{conn}->join($channels);

  foreach my $channel (split /,/, $channels) {
    $channel = lc $channel;
    $self->{pbot}->{event_dispatcher}->dispatch_event('pbot.join', { channel => $channel });

    delete $self->{is_opped}->{$channel};
    delete $self->{op_requested}->{$channel};

    if (exists $self->{pbot}->{channels}->{channels}->hash->{$channel}
        and exists $self->{pbot}->{channels}->{channels}->hash->{$channel}{permop}
        and $self->{pbot}->{channels}->{channels}->hash->{$channel}{permop}) {
      $self->gain_ops($channel);
    }

    $self->{pbot}->{conn}->mode($channel);
  }
}

sub part_channel {
  my ($self, $channel) = @_;

  $channel = lc $channel;

  $self->{pbot}->{event_dispatcher}->dispatch_event('pbot.part', { channel => $channel });
  $self->{pbot}->{conn}->part($channel);

  delete $self->{is_opped}->{$channel};
  delete $self->{op_requested}->{$channel};
}

sub has_ban_timeout {
  my ($self, $channel, $mask) = @_;
  return exists $self->{unban_timeout}->hash->{lc $channel}->{lc $mask};
}

sub has_mute_timeout {
  my ($self, $channel, $mask) = @_;
  return exists $self->{unmute_timeout}->hash->{lc $channel}->{lc $mask};
}

sub add_to_ban_queue {
  my ($self, $channel, $mode, $target) = @_;
  push @{$self->{ban_queue}->{$channel}->{$mode}}, $target;
  $self->{pbot}->{logger}->log("Added +$mode $target for $channel to ban queue.\n");
}

sub check_ban_queue {
  my $self = shift;

  my $MAX_COMMANDS = 4;
  my $commands = 0;

  foreach my $channel (keys %{$self->{ban_queue}}) {
    my $done = 0;
    while (not $done) {
      my ($list, $count, $modes);
      $list = '';
      $modes = '+';
      $count = 0;

      foreach my $mode (keys %{$self->{ban_queue}->{$channel}}) {
        while (@{$self->{ban_queue}->{$channel}->{$mode}}) {
          my $target = pop @{$self->{ban_queue}->{$channel}->{$mode}};
          $list .= " $target";
          $modes .= $mode;
          last if ++$count >= $self->{pbot}->{ircd}->{MODES};
        }

        if (not @{$self->{ban_queue}->{$channel}->{$mode}}) {
          delete $self->{ban_queue}->{$channel}->{$mode};
        }

        last if $count >= $self->{pbot}->{ircd}->{MODES};
      }

      if (not keys %{ $self->{ban_queue}->{$channel} }) {
        delete $self->{ban_queue}->{$channel};
        $done = 1;
      }

      if ($count) {
        $self->add_op_command($channel, "mode $channel $modes $list");
        $self->gain_ops($channel);

        return if ++$commands >= $MAX_COMMANDS;
      }
    }
  }
}

sub add_to_unban_queue {
  my ($self, $channel, $mode, $target) = @_;
  push @{$self->{unban_queue}->{$channel}->{$mode}}, $target;
  $self->{pbot}->{logger}->log("Added -$mode $target for $channel to unban queue.\n");
}

sub check_unban_queue {
  my $self = shift;

  my $MAX_COMMANDS = 4;
  my $commands = 0;

  foreach my $channel (keys %{$self->{unban_queue}}) {
    my $done = 0;
    while (not $done) {
      my ($list, $count, $modes);
      $list = '';
      $modes = '-';
      $count = 0;

      foreach my $mode (keys %{$self->{unban_queue}->{$channel}}) {
        while (@{$self->{unban_queue}->{$channel}->{$mode}}) {
          my $target = pop @{$self->{unban_queue}->{$channel}->{$mode}};
          $list .= " $target";
          $modes .= $mode;
          last if ++$count >= $self->{pbot}->{ircd}->{MODES};
        }

        if (not @{$self->{unban_queue}->{$channel}->{$mode}}) {
          delete $self->{unban_queue}->{$channel}->{$mode};
        }

        last if $count >= $self->{pbot}->{ircd}->{MODES};
      }

      if (not keys %{ $self->{unban_queue}->{$channel} }) {
        delete $self->{unban_queue}->{$channel};
        $done = 1;
      }

      if ($count) {
        $self->add_op_command($channel, "mode $channel $modes $list");
        $self->gain_ops($channel);

        return if ++$commands >= $MAX_COMMANDS;
      }
    }
  }
}

sub check_unban_timeouts {
  my $self = shift;

  return if not $self->{pbot}->{joined_channels};

  my $now = gettimeofday();

  foreach my $channel (keys %{ $self->{unban_timeout}->hash }) {
    foreach my $mask (keys %{ $self->{unban_timeout}->hash->{$channel} }) {
      if ($self->{unban_timeout}->hash->{$channel}->{$mask}{timeout} < $now) {
        $self->{unban_timeout}->hash->{$channel}->{$mask}{timeout} = $now + 7200;
        $self->unban_user($mask, $channel);
      }
    }
  }
}

sub check_unmute_timeouts {
  my $self = shift;

  return if not $self->{pbot}->{joined_channels};

  my $now = gettimeofday();

  foreach my $channel (keys %{ $self->{unmute_timeout}->hash }) {
    foreach my $mask (keys %{ $self->{unmute_timeout}->hash->{$channel} }) {
      if ($self->{unmute_timeout}->hash->{$channel}->{$mask}{timeout} < $now) {
        $self->{unmute_timeout}->hash->{$channel}->{$mask}{timeout} = $now + 7200;
        $self->unmute_user($mask, $channel);
      }
    }
  }
}

sub check_opped_timeouts {
  my $self = shift;
  my $now = gettimeofday();

  foreach my $channel (keys %{ $self->{is_opped} }) {
    if ($self->{is_opped}->{$channel}{timeout} < $now) {
      unless (exists $self->{pbot}->{channels}->{channels}->hash->{$channel}
          and exists $self->{pbot}->{channels}->{channels}->hash->{$channel}{permop}
          and $self->{pbot}->{channels}->{channels}->hash->{$channel}{permop}) {
        $self->lose_ops($channel);
        delete $self->{is_opped}->{$channel}; # assume op_nick is alive and deop will succeed
      }
    } else {
      # my $timediff = $self->{is_opped}->{$channel}{timeout} - $now;
      # $self->{pbot}->{logger}->log("deop $channel in $timediff seconds\n");
    }
  }

  foreach my $channel (keys %{ $self->{op_requested} }) {
    if ($now - $self->{op_requested}->{$channel} > 60 * 5) {
      if (exists $self->{pbot}->{channels}->{channels}->hash->{$channel}
          and $self->{pbot}->{channels}->{channels}->hash->{$channel}{enabled}) {
        $self->{pbot}->{logger}->log("5 minutes since OP request for $channel and no OP yet; trying again ...\n");
        delete $self->{op_requested}->{$channel};
        $self->gain_ops($channel);
      } else {
        $self->{pbot}->{logger}->log("Disregarding OP request for $channel (channel is disabled)\n");
        delete $self->{op_requested}->{$channel};
      }
    }
  }
}

1;