# 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 Plugins::Battleship;

use parent 'Plugins::Plugin';

use warnings; use strict;
use feature 'unicode_strings';
use utf8;

use feature 'switch';

no if $] >= 5.018, warnings => "experimental::smartmatch";

use Time::Duration qw/concise duration/;
use Data::Dumper;
$Data::Dumper::Useqq    = 1;
$Data::Dumper::Sortkeys = 1;

sub initialize {
    my ($self, %conf) = @_;
    $self->{pbot}->{commands}->register(sub { $self->cmd_battleship(@_) }, 'battleship', 0);

    $self->{pbot}->{event_dispatcher}->register_handler('irc.part', sub { $self->on_departure(@_) });
    $self->{pbot}->{event_dispatcher}->register_handler('irc.quit', sub { $self->on_departure(@_) });
    $self->{pbot}->{event_dispatcher}->register_handler('irc.kick', sub { $self->on_kick(@_) });

    $self->{channel} = $self->{pbot}->{registry}->get_value('battleship', 'channel') // '##battleship';
    $self->{debug}   = $self->{pbot}->{registry}->get_value('battleship', 'debug')   // 0;

    $self->{player_one_vert}  = '|';
    $self->{player_one_horiz} = '—';
    $self->{player_two_vert}  = 'I';
    $self->{player_two_horiz} = '=';

    $self->create_states;
}

sub unload {
    my $self = shift;
    $self->{pbot}->{commands}->unregister('battleship');
    $self->{pbot}->{timer}->dequeue_event('battleship loop');
    $self->{pbot}->{event_dispatcher}->remove_handler('irc.part');
    $self->{pbot}->{event_dispatcher}->remove_handler('irc.quit');
    $self->{pbot}->{event_dispatcher}->remove_handler('irc.kick');
}

sub on_kick {
    my ($self, $event_type, $event) = @_;
    my ($nick, $user, $host)  = ($event->{event}->nick, $event->{event}->user, $event->{event}->host);
    my ($victim, $reason) = ($event->{event}->to, $event->{event}->{args}[1]);
    my $channel = $event->{event}->{args}[0];
    return 0 if lc $channel ne $self->{channel};
    $self->player_left($nick, $user, $host);
    return 0;
}

sub on_departure {
    my ($self, $event_type, $event) = @_;
    my ($nick, $user, $host, $channel) = ($event->{event}->nick, $event->{event}->user, $event->{event}->host, $event->{event}->to);
    my $type = uc $event->{event}->type;
    return 0 if $type ne 'QUIT' and lc $channel ne $self->{channel};
    $self->player_left($nick, $user, $host);
    return 0;
}

my %color = (
    white      => "\x0300",
    black      => "\x0301",
    blue       => "\x0302",
    green      => "\x0303",
    red        => "\x0304",
    maroon     => "\x0305",
    purple     => "\x0306",
    orange     => "\x0307",
    yellow     => "\x0308",
    lightgreen => "\x0309",
    teal       => "\x0310",
    cyan       => "\x0311",
    lightblue  => "\x0312",
    magneta    => "\x0313",
    gray       => "\x0314",
    lightgray  => "\x0315",

    bold      => "\x02",
    italics   => "\x1D",
    underline => "\x1F",
    reverse   => "\x16",

    reset => "\x0F",
);

sub cmd_battleship {
    my ($self, $context) = @_;
    $context->{arguments} =~ s/^\s+|\s+$//g;

    my $usage = "Usage: battleship challenge|accept|bomb|board|score|quit|players|kick|abort; for more information about a command: battleship help <command>";

    my ($command, $arguments) = split / /, $context->{arguments}, 2;
    $command = lc $command;

    my ($channel, $result);

    given ($command) {
        when ('help') {
            given ($arguments) {
                when ('help') { return "Seriously?"; }

                default {
                    if   (length $arguments) { return "Battleship help is coming soon."; }
                    else                     { return "Usage: battleship help <command>"; }
                }
            }
        }

        when ('leaderboard') { return "Coming soon."; }

        when ('challenge') {
            if ($self->{current_state} ne 'nogame') { return "There is already a game of Battleship underway."; }

            if (not length $arguments) {
                $self->{current_state} = 'accept';
                $self->{state_data}    = {players => [], counter => 0};

                my $id     = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
                my $player = {id => $id, name => $context->{nick}, missedinputs => 0};
                push @{$self->{state_data}->{players}}, $player;

                $player = {id => -1, name => undef, missedinputs => 0};
                push @{$self->{state_data}->{players}}, $player;

                $self->{pbot}->{timer}->enqueue_event(sub {
                        $self->run_one_state;
                    }, 1, 'battleship loop', 1
                );

                return "/msg $self->{channel} $context->{nick} has made an open challenge!  Use `accept` to accept their challenge.";
            }

            my $challengee = $self->{pbot}->{nicklist}->is_present($self->{channel}, $arguments);

            if (not $challengee) { return "That nick is not present in this channel. Invite them to $self->{channel} and try again!"; }

            $self->{current_state} = 'accept';
            $self->{state_data}    = {players => [], counter => 0};

            my $id     = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            my $player = {id => $id, name => $context->{nick}, missedinputs => 0};
            push @{$self->{state_data}->{players}}, $player;

            ($id) = $self->{pbot}->{messagehistory}->{database}->find_message_account_by_nick($challengee);
            $player = {id => $id, name => $challengee, missedinputs => 0};
            push @{$self->{state_data}->{players}}, $player;

            $self->{pbot}->{timer}->enqueue_event(sub {
                    $self->battleship_loop;
                }, 1, 'battleship loop', 1
            );

            return "/msg $self->{channel} $context->{nick} has challenged $challengee to Battleship! Use `accept` to accept their challenge.";
        }

        when ('accept') {
            if ($self->{current_state} ne 'accept') { return "/msg $context->{nick} This is not the time to use `accept`."; }

            my $id     = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            my $player = $self->{state_data}->{players}->[1];

            # open challenge
            if ($player->{id} == -1) {
                $player->{id}   = $id;
                $player->{name} = $context->{nick};
            }

            if ($player->{id} == $id) {
                $player->{accepted} = 1;
                return "/msg $self->{channel} $context->{nick} has accepted $self->{state_data}->{players}->[0]->{name}'s challenge!";
            } else {
                return "/msg $context->{nick} You have not been challenged to a game of Battleship yet.";
            }
        }

        when ($_ eq 'decline' or $_ eq 'quit' or $_ eq 'forfeit' or $_ eq 'concede') {
            my $id      = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            my $removed = 0;

            for (my $i = 0; $i < @{$self->{state_data}->{players}}; $i++) {
                if ($self->{state_data}->{players}->[$i]->{id} == $id) {
                    $self->{state_data}->{players}->[$i]->{removed} = 1;
                    $removed = 1;
                }
            }

            if ($removed) {
                if ($self->{state_data}->{current_player} >= @{$self->{state_data}->{players}}) { $self->{state_data}->{current_player} = @{$self->{state_data}->{players}} - 1 }

                if (@{$self->{state_data}->{players}} == 2 and ($self->{state_data}->{players}->[1]->{id} == -1 || not $self->{state_data}->{players}->[1]->{accepted})) {
                    return "/msg $self->{channel} $context->{nick} declined the challenge.";
                } else {
                    return "/msg $self->{channel} $context->{nick} has left the game!";
                }
            } else {
                return "$context->{nick}: But you are not even playing the game.";
            }
        }

        when ('abort') {
            if (not $self->{pbot}->{users}->loggedin_admin($self->{channel}, $context->{hostmask})) {
                return "$context->{nick}: Only admins may abort the game.";
            }

            $self->{current_state} = 'gameover';
            return "/msg $self->{channel} $context->{nick}: The game has been aborted.";
        }

        when ('score') {
            if (@{$self->{state_data}->{players}} == 2) {
                $self->show_scoreboard;
                return;
            } else {
                return "There is no game going on right now.";
            }
        }

        when ('players') {
            if    ($self->{current_state} eq 'accept')     { return "$self->{state_data}->{players}->[0]->{name} has challenged $self->{state_data}->{players}->[1]->{name}!"; }
            elsif (@{$self->{state_data}->{players}} == 2) { return "$self->{state_data}->{players}->[0]->{name} is in battle with $self->{state_data}->{players}->[1]->{name}!"; }
            else                                           { return "There are no players playing right now. Start a game with `battleship challenge <nick>`!"; }
        }

        when ('kick') {
            if (not $self->{pbot}->{users}->loggedin_admin($self->{channel}, $context->{hostmask})) {
                return "$context->{nick}: Only admins may kick people from the game.";
            }

            if (not length $arguments) { return "Usage: battleship kick <nick>"; }

            my $removed = 0;

            for (my $i = 0; $i < @{$self->{state_data}->{players}}; $i++) {
                if (lc $self->{state_data}->{players}->[$i]->{name} eq $arguments) {
                    $self->{state_data}->{players}->[$i]->{removed} = 1;
                    $removed = 1;
                }
            }

            if ($removed) {
                if ($self->{state_data}->{current_player} >= @{$self->{state_data}->{players}}) { $self->{state_data}->{current_player} = @{$self->{state_data}->{players}} - 1 }
                return "/msg $self->{channel} $context->{nick}: $arguments has been kicked from the game.";
            } else {
                return "$context->{nick}: $arguments isn't even in the game.";
            }
        }

        when ('bomb') {
            if ($self->{debug}) { $self->{pbot}->{logger}->log("Battleship: bomb state: $self->{current_state}\n" . Dumper $self->{state_data}); }

            if ($self->{current_state} ne 'playermove' and $self->{current_state} ne 'checkplayer') { return "$context->{nick}: It's not time to do that now."; }

            my $id = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            my $player;

            if    ($self->{state_data}->{players}->[0]->{id} == $id) { $player = 0; }
            elsif ($self->{state_data}->{players}->[1]->{id} == $id) { $player = 1; }
            else                                                     { return "You are not playing in this game."; }

            if (not length $arguments) {
                if   (delete $self->{state_data}->{players}->[$player]->{location}) { return "$context->{nick}: Attack location cleared."; }
                else                                                                { return "$context->{nick}: Usage: bomb <location>"; }
            }

            if ($arguments !~ m/^[a-zA-Z][0-9]+$/) { return "$context->{nick}: Usage: battleship bomb <location>; <location> must be in the form of A15, B3, C9, etc."; }

            $arguments = uc $arguments;

            my ($x, $y);
            ($x) = $arguments =~ m/^(.)/;
            ($y) = $arguments =~ m/^.(.*)/;

            $x = ord($x) - 65;

            if ($x < 0 || $x > $self->{N_Y} || $y < 0 || $y > $self->{N_X}) { return "$context->{nick}: Target out of range, try again."; }

            if ($self->{state_data}->{current_player} != $player) {
                my $msg;
                if (not exists $self->{state_data}->{players}->[$player]->{location}) { $msg = "$context->{nick}: You will attack $arguments when it is your turn."; }
                else { $msg = "$context->{nick}: You will now attack $arguments instead of $self->{state_data}->{players}->[$player]->{location} when it is your turn."; }
                $self->{state_data}->{players}->[$player]->{location} = $arguments;
                return $msg;
            }

            if ($self->{player}->[$player]->{done}) { return "$context->{nick}: You have already attacked this turn."; }

            if ($self->bomb($player, uc $arguments)) {
                if ($self->{player}->[$player]->{won}) {
                    $self->{previous_state} = $self->{current_state};
                    $self->{current_state}  = 'checkplayer';
                    $self->run_one_state;
                } else {
                    $self->{player}->[$player]->{done}    = 1;
                    $self->{player}->[!$player]->{done}   = 0;
                    $self->{state_data}->{current_player} = !$player;
                    $self->{state_data}->{ticks}          = 1;
                    $self->{state_data}->{first_tock}     = 1;
                    $self->{state_data}->{counter}        = 0;
                }
            }
        }

        when ($_ eq 'specboard' or $_ eq 'board') {
            if ($self->{current_state} eq 'nogame' or $self->{current_state} eq 'accept' or $self->{current_state} eq 'genboard' or $self->{current_state} eq 'gameover') {
                return "$context->{nick}: There is no board to show right now.";
            }

            if ($_ eq 'specboard') {
                $self->show_battlefield(2);
                return;
            }

            my $id = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            for (my $i = 0; $i < 2; $i++) {
                if ($self->{state_data}->{players}->[$i]->{id} == $id) {
                    $self->send_message($self->{channel}, "$context->{nick} surveys the battlefield!");
                    $self->show_battlefield($i);
                    return;
                }
            }
            $self->show_battlefield(2);
        }

        when ('fullboard') {
            if (not $self->{pbot}->{users}->loggedin_admin($self->{channel}, $context->{hostmask})) {
                return "$context->{nick}: Only admins may see the full board.";
            }

            if ($self->{current_state} eq 'nogame' or $self->{current_state} eq 'accept' or $self->{current_state} eq 'genboard' or $self->{current_state} eq 'gameover') {
                return "$context->{nick}: There is no board to show right now.";
            }

            # show real board if admin is actually in the game ... no cheating!
            my $id = $self->{pbot}->{messagehistory}->{database}->get_message_account($context->{nick}, $context->{user}, $context->{host});
            for (my $i = 0; $i < 2; $i++) {
                if ($self->{state_data}->{players}->[$i]->{id} == $id) {
                    $self->send_message($self->{channel}, "$context->{nick} surveys the battlefield!");
                    $self->show_battlefield($i);
                    return;
                }
            }
            $self->show_battlefield(4, $context->{nick});
        }

        default { return $usage; }
    }

    return $result;
}

sub player_left {
    my ($self, $nick, $user, $host) = @_;

    my $id      = $self->{pbot}->{messagehistory}->{database}->get_message_account($nick, $user, $host);
    my $removed = 0;

    for (my $i = 0; $i < @{$self->{state_data}->{players}}; $i++) {
        if ($self->{state_data}->{players}->[$i]->{id} == $id) {
            $self->{state_data}->{players}->[$i]->{removed} = 1;
            $self->send_message($self->{channel}, "$nick has left the game!");
            $removed = 1;
        }
    }

    if ($removed) {
        if ($self->{state_data}->{current_player} >= @{$self->{state_data}->{players}}) { $self->{state_data}->{current_player} = @{$self->{state_data}->{players}} - 1 }
        return "/msg $self->{channel} $nick has left the game!";
    }
}

sub send_message {
    my ($self, $to, $text, $delay) = @_;
    $delay = 0 if not defined $delay;
    my $botnick = $self->{pbot}->{registry}->get_value('irc', 'botnick');
    my $message = {
        nick    => $botnick, user => 'battleship', host => 'localhost', command => 'battleship text', checkflood => 1,
        message => $text
    };
    $self->{pbot}->{interpreter}->add_message_to_output_queue($to, $message, $delay);
}

sub run_one_state {
    my $self = shift;

    # check for naughty or missing players
    if ($self->{current_state} =~ /(?:move|accept)/) {
        my $removed = 0;
        for (my $i = 0; $i < @{$self->{state_data}->{players}}; $i++) {
            if ($self->{state_data}->{players}->[$i]->{missedinputs} >= 3) {
                $self->send_message(
                    $self->{channel},
                    "$color{red}$self->{state_data}->{players}->[$i]->{name} has missed too many prompts and has been ejected from the game!$color{reset}"
                );
                $self->{state_data}->{players}->[$i]->{removed} = 1;
                $removed = 1;
            }
        }

        if ($removed) {
            if ($self->{state_data}->{current_player} >= @{$self->{state_data}->{players}}) { $self->{state_data}->{current_player} = @{$self->{state_data}->{players}} - 1 }
        }

        if ($self->{state_data}->{players}->[0]->{removed} or $self->{state_data}->{players}->[1]->{removed}) { $self->{current_state} = 'gameover'; }
    }

    my $state_data = $self->{state_data};

    # this shouldn't happen
    if (not defined $self->{current_state}) {
        $self->{pbot}->{logger}->log("Battleship state broke.\n");
        $self->{current_state} = 'nogame';
        return;
    }

    # transistioned to a brand new state; prepare first tock
    if ($self->{previous_state} ne $self->{current_state}) {
        $state_data->{newstate} = 1;
        $state_data->{ticks}    = 1;

        if (exists $state_data->{tick_drift}) {
            $state_data->{ticks} += $state_data->{tick_drift};
            delete $state_data->{tick_drift};
        }

        $state_data->{first_tock} = 1;
        $state_data->{counter}    = 0;
    } else {
        $state_data->{newstate} = 0;
    }

    # dump new state data for logging/debugging
    if ($self->{debug} and $state_data->{newstate}) { $self->{pbot}->{logger}->log("Battleship: New state: $self->{current_state}\n" . Dumper $state_data); }

    # run one state/tick
    $state_data = $self->{states}{$self->{current_state}}{sub}($state_data);

    if ($state_data->{tocked}) {
        delete $state_data->{tocked};
        delete $state_data->{first_tock};
        $state_data->{ticks} = 0;
    }

    # transform to next state
    $state_data->{previous_result} = $state_data->{result};
    $self->{previous_state}        = $self->{current_state};
    $self->{current_state}         = $self->{states}{$self->{current_state}}{trans}{$state_data->{result}};
    $self->{state_data}            = $state_data;

    # next tick
    $self->{state_data}->{ticks}++;
}

sub create_states {
    my $self = shift;

    $self->{pbot}->{logger}->log("Battleship: Creating game state machine\n");

    $self->{previous_state} = '';
    $self->{current_state}  = 'nogame';
    $self->{state_data}     = {players => [], ticks => 0, newstate => 1};

    $self->{state_data}->{current_player} = 0;

    $self->{states}{'nogame'}{sub}              = sub { $self->nogame(@_) };
    $self->{states}{'nogame'}{trans}{challenge} = 'accept';
    $self->{states}{'nogame'}{trans}{nogame}    = 'nogame';

    $self->{states}{'accept'}{sub}           = sub { $self->accept(@_) };
    $self->{states}{'accept'}{trans}{stop}   = 'nogame';
    $self->{states}{'accept'}{trans}{wait}   = 'accept';
    $self->{states}{'accept'}{trans}{accept} = 'genboard';

    $self->{states}{'genboard'}{sub} = sub { $self->genboard(@_) };
    $self->{states}{'genboard'}{trans}{next} = 'showboard';

    $self->{states}{'showboard'}{sub} = sub { $self->showboard(@_) };
    $self->{states}{'showboard'}{trans}{next} = 'playermove';

    $self->{states}{'playermove'}{sub}         = sub { $self->playermove(@_) };
    $self->{states}{'playermove'}{trans}{wait} = 'playermove';
    $self->{states}{'playermove'}{trans}{next} = 'checkplayer';

    $self->{states}{'checkplayer'}{sub}         = sub { $self->checkplayer(@_) };
    $self->{states}{'checkplayer'}{trans}{sunk} = 'gameover';
    $self->{states}{'checkplayer'}{trans}{next} = 'playermove';

    $self->{states}{'gameover'}{sub}         = sub { $self->gameover(@_) };
    $self->{states}{'gameover'}{trans}{wait} = 'gameover';
    $self->{states}{'gameover'}{trans}{next} = 'nogame';
}

# battleship stuff

sub init_game {
    my ($self, $nick1, $nick2) = @_;

    $self->{N_X}   = 15;
    $self->{N_Y}   = 8;
    $self->{SHIPS} = 6;

    for (my $x = 0; $x < $self->{SHIPS}; $x++) { $self->{ship_length}->[$x] = 0; }

    $self->{board} = [];

    $self->{player} = [
        {bombs => 0, hit => 0, miss => 0, sunk => 0, nick => $nick1, done => 0},
        {bombs => 0, hit => 0, miss => 0, sunk => 0, nick => $nick2, done => 0}
    ];

    $self->{turn}  = 0;
    $self->{horiz} = 0;

    $self->generate_battlefield;
}

sub count_ship_sections {
    my ($self, $player) = @_;
    my ($x, $y, $sections);

    $sections = 0;

    for ($x = 0; $x < $self->{N_Y}; $x++) {
        for ($y = 0; $y < $self->{N_X}; $y++) {
            if ($player == 0) {
                if ($self->{board}->[$x][$y] eq $self->{player_two_vert} || $self->{board}->[$x][$y] eq $self->{player_two_horiz}) { $sections++; }
            } else {
                if ($self->{board}->[$x][$y] eq $self->{player_one_vert} || $self->{board}->[$x][$y] eq $self->{player_one_horiz}) { $sections++; }
            }
        }
    }

    return $sections;
}

sub check_ship {
    my ($self, $x, $y, $o, $d, $l) = @_;
    my ($xd, $yd, $i);

    if (!$o) {
        if (!$d) {
            $yd = -1;
            if ($y - $l < 0) { return 0; }
        } else {
            $yd = 1;
            if ($y + $l >= $self->{N_X}) { return 0; }
        }
        $xd = 0;
    } else {
        if (!$d) {
            $xd = -1;
            if ($x - $l < 0) { return 0; }
        } else {
            $xd = 1;
            if ($x + $l >= $self->{N_Y}) { return 0; }
        }
        $yd = 0;
    }

    for (my $i = 0; $i < $l; $i++) {
        if ($self->{board}->[$x += $o ? $xd : 0][$y += $o ? 0 : $yd] ne '~') { return 0; }
    }

    return 1;
}

sub number {
    my ($self, $lower, $upper) = @_;
    return int(rand($upper - $lower)) + $lower;
}

sub generate_ship {
    my ($self, $player, $ship) = @_;
    my ($x, $y, $o, $d, $i, $l);
    my ($yd, $xd) = (0, 0);

    my $fail = 0;
    while (1) {
        $x = $self->number(0, $self->{N_Y});
        $y = $self->number(0, $self->{N_X});

        $o = $self->number(1, 10) < 6;
        $d = $self->number(1, 10) < 6;

        if (not $self->{ship_length}->[$ship]) { $l = $self->number(3, 6); }
        else                                   { $l = $self->{ship_length}->[$ship]; }

        $self->{pbot}->{logger}->log("generate ships player $player: ship $ship x,y: $x,$y  o,d: $o,$d length: $l\n");

        if ($self->check_ship($x, $y, $o, $d, $l)) {
            if (!$o) {
                if   ($self->{horiz} < 2) { next; }
                if   (!$d)                { $yd = -1; }
                else                      { $yd = 1; }
                $xd = 0;
            } else {
                $self->{horiz}++;
                if   (!$d) { $xd = -1; }
                else       { $xd = 1; }
                $yd = 0;
            }

            for (my $i = 0; $i < $l; $i++) {
                $self->{board}->[$x += $o ? $xd : 0][$y += $o ? 0 : $yd] =
                  $player ? ($o ? $self->{player_two_vert} : $self->{player_two_horiz}) : ($o ? $self->{player_one_vert} : $self->{player_one_horiz});
            }

            $self->{ship_length}->[$ship] = $l;
            return 1;
        }

        if (++$fail >= 5000) {
            $self->{pbot}->{logger}->log("Failed to generate ship\n");
            $self->send_message($self->{channel}, "Failed to place a ship. I cannot continue. Game over.");
            $self->{current_state} = 'nogame';
            return 0;
        }
    }
}

sub generate_battlefield {
    my ($self) = @_;
    my ($x, $y);

    for ($y = 0; $y < $self->{N_Y}; $y++) {
        for ($x = 0; $x < $self->{N_X}; $x++) { $self->{board}->[$y][$x] = '~'; }
    }

    for ($x = 0; $x < $self->{SHIPS}; $x++) {
        if (!$self->generate_ship(0, $x) || !$self->generate_ship(1, $x)) { return 0; }
    }
    return 1;
}

sub check_sunk {
    my ($self, $x, $y, $player) = @_;
    my ($i, $target);

    $target = $self->{board}->[$x][$y];

    given ($target) {
        when ($_ eq $self->{player_two_vert} or $_ eq $self->{player_one_vert}) {
            for ($i = $x + 1; $i < $self->{N_Y}; $i++) {
                if (($self->{board}->[$i][$y] eq $self->{player_one_vert} && $player) || ($self->{board}->[$i][$y] eq $self->{player_two_vert} && !$player)) { return 0; }

                if ($self->{board}->[$i][$y] eq '~' || $self->{board}->[$i][$y] eq '*' || $self->{board}->[$i][$y] eq 'o') { last; }
            }

            for ($i = $x - 1; $i >= 0; $i--) {
                if (($self->{board}->[$i][$y] eq $self->{player_one_vert} && $player) || ($self->{board}->[$i][$y] eq $self->{player_two_vert} && !$player)) { return 0; }

                if ($self->{board}->[$i][$y] eq '~' || $self->{board}->[$i][$y] eq '*' || $self->{board}->[$i][$y] eq 'o') { last; }
            }

            return 1;
        }

        when ($_ eq $self->{player_one_horiz} or $_ eq $self->{player_two_horiz}) {
            for ($i = $y + 1; $i < $self->{N_X}; $i++) {
                if (($self->{board}->[$x][$i] eq $self->{player_one_horiz} && $player) || ($self->{board}->[$x][$i] eq $self->{player_two_horiz} && !$player)) { return 0; }

                if ($self->{board}->[$x][$i] eq '~' || $self->{board}->[$x][$i] eq '*' || $self->{board}->[$x][$i] eq 'o') { last; }
            }

            for ($i = $y - 1; $i >= 0; $i--) {
                if (($self->{board}->[$x][$i] eq $self->{player_one_horiz} && $player) || ($self->{board}->[$x][$i] eq $self->{player_two_horiz} && !$player)) { return 0; }

                if ($self->{board}->[$x][$i] eq '~' || $self->{board}->[$x][$i] eq '*' || $self->{board}->[$x][$i] eq 'o') { last; }
            }

            return 1;
        }
    }
}

sub bomb {
    my ($self, $player, $location) = @_;
    my ($x, $y, $hit, $sections, $sunk) = (0, 0, 0, 0, 0);

    $location = uc $location;

    ($x) = $location =~ m/^(.)/;
    ($y) = $location =~ m/^.(.*)/;

    $x = ord($x) - 65;

    $self->{pbot}->{logger}->log("bomb player $player   $x,$y  $self->{board}->[$x][$y]\n");

    if ($x < 0 || $x > $self->{N_Y} || $y < 0 || $y > $self->{N_X}) {
        $self->send_message($self->{channel}, "Target out of range, try again.");
        return 0;
    }

    $y--;

    if (!$player) {
        if ($self->{board}->[$x][$y] eq $self->{player_two_vert} || $self->{board}->[$x][$y] eq $self->{player_two_horiz}) { $hit = 1; }
    } else {
        if ($self->{board}->[$x][$y] eq $self->{player_one_vert} || $self->{board}->[$x][$y] eq $self->{player_one_horiz}) { $hit = 1; }
    }

    $sunk = $self->check_sunk($x, $y, $player);

    if ($hit) {
        if   (!$player) { $self->{board}->[$x][$y] = '1'; }
        else            { $self->{board}->[$x][$y] = '2'; }
        $self->{player}->[$player]->{hit}++;
    } else {
        if ($self->{board}->[$x][$y] eq '~') {
            if   (!$player) { $self->{board}->[$x][$y] = '*'; }
            else            { $self->{board}->[$x][$y] = 'o'; }
            $self->{player}->[$player]->{miss}++;
        }
    }

    my $nick1 = $self->{player}->[$player]->{nick};
    my $nick2 = $self->{player}->[$player ? 0 : 1]->{nick};

    my @attacks = (
        "launches torpedoes at",         "launches nukes at",      "fires cannons at", "fires torpedoes at", "fires nukes at",
        "launches tomahawk missiles at", "fires a gatling gun at", "launches ballistic missiles at"
    );

    my $attacked = $attacks[rand @attacks];
    if ($hit) {
        $self->send_message($self->{channel}, "$nick1 $attacked $nick2 at $location! $color{red}--- HIT! --- $color{reset}");
        $self->{player}->[$player]->{destroyed}++;

        if ($sunk) {
            $self->{player}->[$player]->{sunk}++;
            my $remaining = $self->count_ship_sections($player);
            $self->send_message($self->{channel}, "$color{red}$nick1 has sunk ${nick2}'s ship! $remaining ship section" . ($remaining != 1 ? 's' : '') . " remaining!$color{reset}");

            if ($remaining == 0) {
                $self->send_message($self->{channel}, "$nick1 has WON the game of Battleship!");
                $self->{player}->[$player]->{won} = 1;
            }
        }
    } else {
        $self->send_message($self->{channel}, "$nick1 $attacked $nick2 at $location! --- miss ---");
    }
    $self->{player}->[$player]->{bombs}++;
    return 1;
}

sub show_scoreboard {
    my ($self) = @_;

    my $buf;
    my $p1sections = $self->count_ship_sections(1);
    my $p2sections = $self->count_ship_sections(0);

    my $p1win = "";
    my $p2win = "";

    if ($p1sections > $p2sections) {
        $p1win = "$color{bold}$color{lightgreen} * ";
        $p2win = "$color{red}   ";
    } elsif ($p1sections < $p2sections) {
        $p1win = "$color{red}   ";
        $p2win = "$color{bold}$color{lightgreen} * ";
    }

    my $length_a = length $self->{player}->[0]->{nick};
    my $length_b = length $self->{player}->[1]->{nick};
    my $longest  = $length_a > $length_b ? $length_a : $length_b;

    my $bombslen  = ($self->{player}->[0]->{bombs} > 10 || $self->{player}->[1]->{bombs} > 10) ? 2 : 1;
    my $hitlen    = ($self->{player}->[0]->{hit} > 10   || $self->{player}->[1]->{hit} > 10)   ? 2 : 1;
    my $misslen   = ($self->{player}->[0]->{miss} > 10  || $self->{player}->[1]->{miss} > 10)  ? 2 : 1;
    my $sunklen   = ($self->{player}->[0]->{sunk} > 10  || $self->{player}->[1]->{sunk} > 10)  ? 2 : 1;
    my $intactlen = ($p1sections > 10                   || $p2sections > 10)                   ? 2 : 1;

    my $p1bombscolor  = $self->{player}->[0]->{bombs} > $self->{player}->[1]->{bombs} ? $color{green} : $color{red};
    my $p1hitcolor    = $self->{player}->[0]->{hit} > $self->{player}->[1]->{hit}     ? $color{green} : $color{red};
    my $p1misscolor   = $self->{player}->[0]->{miss} < $self->{player}->[1]->{miss}   ? $color{green} : $color{red};
    my $p1sunkcolor   = $self->{player}->[0]->{sunk} > $self->{player}->[1]->{sunk}   ? $color{green} : $color{red};
    my $p1intactcolor = $p1sections > $p2sections                                     ? $color{green} : $color{red};

    my $p2bombscolor  = $self->{player}->[0]->{bombs} < $self->{player}->[1]->{bombs} ? $color{green} : $color{red};
    my $p2hitcolor    = $self->{player}->[0]->{hit} < $self->{player}->[1]->{hit}     ? $color{green} : $color{red};
    my $p2misscolor   = $self->{player}->[0]->{miss} > $self->{player}->[1]->{miss}   ? $color{green} : $color{red};
    my $p2sunkcolor   = $self->{player}->[0]->{sunk} < $self->{player}->[1]->{sunk}   ? $color{green} : $color{red};
    my $p2intactcolor = $p1sections < $p2sections                                     ? $color{green} : $color{red};

    $buf = sprintf(
        "$p1win%*s$color{reset}: bomb: $p1bombscolor%*d$color{reset}, hit: $p1hitcolor%*d$color{reset}, miss: $p1misscolor%*d$color{reset}, sunk: $p1sunkcolor%*d$color{reset}, sections left: $p1intactcolor%*d$color{reset}",
        $longest, $self->{player}->[0]->{nick}, $bombslen,  $self->{player}->[0]->{bombs},
        $hitlen,  $self->{player}->[0]->{hit},  $misslen,   $self->{player}->[0]->{miss},
        $sunklen, $self->{player}->[0]->{sunk}, $intactlen, $p1sections
    );
    $self->send_message($self->{channel}, $buf);
    $buf = sprintf(
        "$p2win%*s$color{reset}: bomb: $p2bombscolor%*d$color{reset}, hit: $p2hitcolor%*d$color{reset}, miss: $p2misscolor%*d$color{reset}, sunk: $p2sunkcolor%*d$color{reset}, sections left: $p2intactcolor%*d$color{reset}",
        $longest, $self->{player}->[1]->{nick}, $bombslen,  $self->{player}->[1]->{bombs},
        $hitlen,  $self->{player}->[1]->{hit},  $misslen,   $self->{player}->[1]->{miss},
        $sunklen, $self->{player}->[1]->{sunk}, $intactlen, $p2sections
    );
    $self->send_message($self->{channel}, $buf);
}

sub show_battlefield {
    my ($self, $player, $nick) = @_;
    my ($x, $y, $buf);

    $self->{pbot}->{logger}->log("showing battlefield for player $player\n");

    $buf = "$color{cyan},01  ";

    for ($x = 1; $x < $self->{N_X} + 1; $x++) {
        if ($x % 10 == 0) {
            $buf .= "$color{yellow},01" if $self->{N_X} > 10;
            $buf .= $x % 10;
            $buf .= ' ';
            $buf .= "$color{cyan},01" if $self->{N_X} > 10;
        } else {
            $buf .= $x % 10;
            $buf .= ' ';
        }
    }

    $buf .= "\n";

    for ($y = 0; $y < $self->{N_Y}; $y++) {
        $buf .= sprintf("$color{cyan},01%c ", 97 + $y);
        for ($x = 0; $x < $self->{N_X}; $x++) {
            if ($player == 0) {
                if ($self->{board}->[$y][$x] eq $self->{player_two_vert} || $self->{board}->[$y][$x] eq $self->{player_two_horiz}) {
                    $buf .= "$color{blue},01~ ";
                    next;
                } else {
                    if    ($self->{board}->[$y][$x] eq '1' || $self->{board}->[$y][$x] eq '2') { $buf .= "$color{red},01"; }
                    elsif ($self->{board}->[$y][$x] eq 'o' || $self->{board}->[$y][$x] eq '*') { $buf .= "$color{cyan},01"; }
                    elsif ($self->{board}->[$y][$x] eq '~') {
                        $buf .= "$color{blue},01~ ";
                        next;
                    } else {
                        $buf .= "$color{white},01";
                    }
                    $buf .= "$self->{board}->[$y][$x] ";
                    $self->{pbot}->{logger}->log("$y, $x: $self->{board}->[$y][$x]\n");
                }
            } elsif ($player == 1) {
                if ($self->{board}->[$y][$x] eq $self->{player_one_vert} || $self->{board}->[$y][$x] eq $self->{player_one_horiz}) {
                    $buf .= "$color{blue},01~ ";
                    next;
                } else {
                    if    ($self->{board}->[$y][$x] eq '1' || $self->{board}->[$y][$x] eq '2') { $buf .= "$color{red},01"; }
                    elsif ($self->{board}->[$y][$x] eq 'o' || $self->{board}->[$y][$x] eq '*') { $buf .= "$color{cyan},01"; }
                    elsif ($self->{board}->[$y][$x] eq '~') {
                        $buf .= "$color{blue},01~ ";
                        next;
                    } else {
                        $buf .= "$color{white},01";
                    }
                    $buf .= "$self->{board}->[$y][$x] ";
                }
            } elsif ($player == 2) {
                if (   $self->{board}->[$y][$x] eq $self->{player_one_vert}
                    || $self->{board}->[$y][$x] eq $self->{player_one_horiz}
                    || $self->{board}->[$y][$x] eq $self->{player_two_vert}
                    || $self->{board}->[$y][$x] eq $self->{player_two_horiz})
                {
                    $buf .= "$color{blue},01~ ";
                    next;
                } else {
                    if    ($self->{board}->[$y][$x] eq '1' || $self->{board}->[$y][$x] eq '2') { $buf .= "$color{red},01"; }
                    elsif ($self->{board}->[$y][$x] eq 'o' || $self->{board}->[$y][$x] eq '*') { $buf .= "$color{cyan},01"; }
                    elsif ($self->{board}->[$y][$x] eq '~') {
                        $buf .= "$color{blue},01~ ";
                        next;
                    } else {
                        $buf .= "$color{white},01";
                    }
                    $buf .= "$self->{board}->[$y][$x] ";
                }
            } else {
                if    ($self->{board}->[$y][$x] eq '1' || $self->{board}->[$y][$x] eq '2') { $buf .= "$color{red},01"; }
                elsif ($self->{board}->[$y][$x] eq 'o' || $self->{board}->[$y][$x] eq '*') { $buf .= "$color{cyan},01"; }
                elsif ($self->{board}->[$y][$x] eq '~') {
                    $buf .= "$color{blue},01~ ";
                    next;
                } else {
                    $buf .= "$color{white},01";
                }
                $buf .= "$self->{board}->[$y][$x] ";
            }
        }
        $buf .= sprintf("$color{cyan},01%c", 97 + $y);
        $buf .= "$color{reset}\n";
    }

    # bottom border
    $buf .= "$color{cyan},01  ";

    for ($x = 1; $x < $self->{N_X} + 1; $x++) {
        if ($x % 10 == 0) {
            $buf .= $color{yellow}, 01 if $self->{N_X} > 10;
            $buf .= $x % 10;
            $buf .= ' ';
            $buf .= $color{cyan}, 01 if $self->{N_X} > 10;
        } else {
            $buf .= $x % 10;
            $buf .= ' ';
        }
    }

    $buf .= "\n";

    my $player1 = $self->{player}->[0]->{nick};
    my $player2 = $self->{player}->[1]->{nick};

    if ($player == 0) {
        $self->send_message(
            $self->{player}->[$player]->{nick},
            "Player One Legend: ships: [| -]  ocean: [$color{blue},01~$color{reset}]  $player1 miss: [$color{cyan},01*$color{reset}]  $player2 miss: [$color{cyan},01o$color{reset}]  $player1 hit: [$color{red},01"
              . "1"
              . "$color{reset}]  $player2 hit: [$color{red},012$color{reset}]"
        );
    } elsif ($player == 1) {
        $self->send_message(
            $self->{player}->[$player]->{nick},
            "Player Two Legend: ships: [I =]  ocean: [$color{blue},01~$color{reset}]  $player1 miss: [$color{cyan},01*$color{reset}]  $player2 miss: [$color{cyan},01o$color{reset}]  $player1 hit: [$color{red},01"
              . "1"
              . "$color{reset}]  $player2 hit: [$color{red},012$color{reset}]"
        );
    } elsif ($player == 2) {
        $self->send_message(
            $self->{channel},
            "Spectator Legend: ocean: [$color{blue},01~$color{reset}]  $player1 miss: [$color{cyan},01*$color{reset}]  $player2 miss: [$color{cyan},01o$color{reset}]  $player1 hit: [$color{red},01"
              . "1"
              . "$color{reset}]  $player2 hit: [$color{red},012$color{reset}]"
        );
    } elsif ($player == 3) {
        $self->send_message(
            $self->{channel},
            "Final Board Legend: $player1 ships: [| -] $player2 ships: [I =]  ocean: [$color{blue},01~$color{reset}]  $player1 miss: [$color{cyan},01*$color{reset}]  $player2 miss: [$color{cyan},01o$color{reset}]  $player1 hit: [$color{red},01"
              . "1"
              . "$color{reset}]  $player2 hit: [$color{red},012$color{reset}]"
        );
    } else {
        $self->send_message(
            $nick,
            "Full Board Legend: $player1 ships: [| -] $player2 ships: [I =]  ocean: [$color{blue},01~$color{reset}]  $player1 miss: [$color{cyan},01*$color{reset}]  $player2 miss: [$color{cyan},01o$color{reset}]  $player1 hit: [$color{red},01"
              . "1"
              . "$color{reset}]  $player2 hit: [$color{red},012$color{reset}]"
        );
    }

    foreach my $line (split /\n/, $buf) {
        if    ($player == 0 || $player == 1) { $self->send_message($self->{player}->[$player]->{nick}, $line); }
        elsif ($player == 2 || $player == 3) { $self->send_message($self->{channel},                   $line); }
        else                                 { $self->send_message($nick,                              $line); }
    }
}

# state subroutines

sub nogame {
    my ($self, $state) = @_;
    $state->{result} = 'nogame';
    $self->{pbot}->{timer}->update_repeating('battleship loop', 0);
    return $state;
}

sub accept {
    my ($self, $state) = @_;

    $state->{max_count} = 3;

    if ($state->{players}->[1]->{accepted}) {
        $state->{result} = 'accept';
        return $state;
    }

    my $tock = 15;

    if ($state->{ticks} % $tock == 0) {
        $state->{tocked} = 1;

        if (++$state->{counter} > $state->{max_count}) {
            if ($state->{players}->[1]->{id} == -1) { $self->send_message($self->{channel}, "Nobody has accepted $state->{players}->[0]->{name}'s challenge."); }
            else { $self->send_message($self->{channel}, "$state->{players}->[1]->{name} has failed to accept $state->{players}->[0]->{name}'s challenge."); }
            $state->{result}  = 'stop';
            $state->{players} = [];
            return $state;
        }

        if ($state->{players}->[1]->{id} == -1) {
            $self->send_message($self->{channel}, "$state->{players}->[0]->{name} has made an open challenge! Use `accept` to accept their challenge.");
        } else {
            $self->send_message($self->{channel}, "$state->{players}->[1]->{name}: $state->{players}->[0]->{name} has challenged you! Use `accept` to accept their challenge.");
        }
    }

    $state->{result} = 'wait';
    return $state;
}

sub genboard {
    my ($self, $state) = @_;
    $self->init_game($state->{players}->[0]->{name}, $state->{players}->[1]->{name});
    $state->{current_player} = 0;
    $state->{max_count}      = 3;
    $state->{result}         = 'next';
    return $state;
}

sub showboard {
    my ($self, $state) = @_;
    $self->send_message($self->{channel}, "Showing battlefield to $self->{player}->[0]->{nick}...");
    $self->show_battlefield(0);
    $self->send_message($self->{channel}, "Showing battlefield to $self->{player}->[1]->{nick}...");
    $self->show_battlefield(1);
    $self->send_message($self->{channel}, "Fight! Anybody (players and spectators) can use `board` at any time to see the battlefield.");
    $state->{result} = 'next';
    return $state;
}

sub playermove {
    my ($self, $state) = @_;

    my $tock;
    if   ($state->{first_tock}) { $tock = 3; }
    else                        { $tock = 15; }

    if ($self->{player}->[$state->{current_player}]->{done}) {
        $self->{pbot}->{logger}->log("playermove: player $state->{current_player} done, nexting\n");
        $state->{result} = 'next';
        return $state;
    }

    my $player   = $state->{current_player};
    my $location = delete $state->{players}->[$player]->{location};

    if (defined $location) {
        if ($self->bomb($player, uc $location)) {
            $self->{player}->[$player]->{done}    = 1;
            $self->{player}->[!$player]->{done}   = 0;
            $self->{state_data}->{current_player} = !$player;
            $state->{result}                      = 'next';
            return $state;
        }
    }

    if ($state->{ticks} % $tock == 0) {
        $state->{tocked} = 1;
        if (++$state->{counter} > $state->{max_count}) {
            $state->{players}->[$state->{current_player}]->{missedinputs}++;
            $self->send_message($self->{channel}, "$state->{players}->[$state->{current_player}]->{name} failed to launch an attack in time. They forfeit their turn!");
            $self->{player}->[$state->{current_player}]->{done}  = 1;
            $self->{player}->[!$state->{current_player}]->{done} = 0;
            $state->{current_player}                             = !$state->{current_player};
            $state->{result}                                     = 'next';
            return $state;
        }

        my $red = $state->{counter} == $state->{max_count} ? $color{red} : '';

        my $remaining = 15 * $state->{max_count};
        $remaining -= 15 * ($state->{counter} - 1);
        $remaining = "(" . (concise duration $remaining) . " remaining)";

        $self->send_message($self->{channel}, "$state->{players}->[$state->{current_player}]->{name}: $red$remaining Launch an attack now via `bomb <location>`!$color{reset}");
    }

    $state->{result} = 'wait';
    return $state;
}

sub checkplayer {
    my ($self, $state) = @_;

    if   ($self->{player}->[0]->{won} or $self->{player}->[1]->{won}) { $state->{result} = 'sunk'; }
    else                                                              { $state->{result} = 'next'; }
    return $state;
}

sub gameover {
    my ($self, $state) = @_;
    if ($state->{ticks} % 5 == 0) {
        if ($state->{players}->[1]->{id} != -1 && $state->{players}->[1]->{accepted}) {
            $self->show_battlefield(3);
            $self->show_scoreboard;
            $self->send_message($self->{channel}, "Game over!");
        }
        $state->{players} = [];
        $state->{counter} = 0;
        $state->{result}  = 'next';
    } else {
        $state->{result} = 'wait';
    }
    return $state;
}

1;