File Coverage

blib/lib/Games/Dukedom.pm

Criterion	Covered	Total	%
statement	102	575	17.7
branch	3	176	1.7
condition	4	73	5.4
subroutine	33	60	55.0
pod	4	5	80.0
total	146	889	16.4

package Games::Dukedom;

our $VERSION = 'v0.1.2';

use Storable qw( freeze thaw );
use Carp;

use Games::Dukedom::Signal;

use Moo 1.004003;
use MooX::StrictConstructor;
use MooX::ClassAttribute;

use MooX::Struct -rw, Land => [
    qw(
      +trades
      +spoils
      +price
      +sell_price
      +planted
      )
  ],
  Population => [
    qw(
      +starvations
      +levy
      +casualties
      +looted
      +diseased
      +deaths
      +births
      )
  ],
  Grain => [
    qw(
      +food
      +trades
      +seed
      +spoilage
      +wages
      +spoils
      +yield
      +expense
      +taxes
      )
  ],
  War => [
    qw(
      +first_strike
      +tension
      +desire
      +will
      +grain_damage
      +risk
      )
  ];

# status codes
use constant RUNNING   => 0;
use constant RETIRED   => 1;
use constant KINGDOM   => 2;
use constant QUIT_GAME => -1;
use constant DEPOSED   => -2;
use constant ABOLISHED => -3;

# magic numbers
use constant TAX_RATE         => .5;
use constant MAX_YEAR         => 45;
use constant MIN_LAND         => 45;
use constant MIN_POPULATION   => 33;
use constant MIN_GRAIN        => 429;
use constant MAX_FOOD_BONUS   => 4;
use constant LABOR_CAPACITY   => 4;
use constant SEED_PER_HA      => 2;
use constant MAX_SALE         => 4000;
use constant MAX_SELL_TRIES   => 3;
use constant MIN_LAND_PRICE   => 4;
use constant MIN_EXPENSE      => 429;
use constant WAR_CONSTANT     => 1.95;
use constant UNREST_FACTOR    => .85;
use constant MAX_1YEAR_UNREST => 88;
use constant MAX_TOTAL_UNREST => 99;

my @steps = (
    qw(
      _init_year
      _feed_the_peasants
      _starvation_and_unrest
      _purchase_land
      _war_with_the_king
      _grain_production
      _kings_levy
      _war_with_neigbor
      _population_changes
      _harvest_grain
      _update_unrest
      )
);

my @settable_steps = (
    qw(
      _display_msg
      _feed_the_peasants
      _purchase_land
      _sell_land
      _king_wants_war
      _grain_production
      _kings_levy
      _first_strike
      _goto_war
      _quit_game
      )
);


my %traits = (
    price => {
        q1 => 4,
        q2 => 7,
    },
    yield => {
        q1 => 4,
        q2 => 8,
    },
    spoilage => {
        q1 => 4,
        q2 => 6,
    },
    levies => {
        q1 => 3,
        q2 => 8,
    },
    war => {
        q1 => 5,
        q2 => 8,
    },
    first_strike => {
        q1 => 3,
        q2 => 6,
    },
    disease => {
        q1 => 3,
        q2 => 8,
    },
    birth => {
        q1 => 4,
        q2 => 8,
    },
    merc_quality => {
        q1 => 8,
        q2 => 8,
    },
);

my $fnr = sub {
    my ( $q1, $q2 ) = @_;

    return int( rand() * ( 1 + $q2 - $q1 ) ) + $q1;
};

my $gauss = sub {
    my ( $q1, $q2 ) = @_;

    my $g0;

    my $q3 = &$fnr( $q1, $q2 );
    if ( &$fnr( $q1, $q2 ) > 5 ) {
        $g0 = ( $q3 + &$fnr( $q1, $q2 ) ) / 2;
    }
    else {
        $g0 = $q3;
    }

    return $g0;
};

class_has signal => (
    is       => 'ro',
    init_arg => undef,
    default  => 'Games::Dukedom::Signal',
    handles  => 'Throwable',
);

has _base_values => (
    is       => 'ro',
    init_arg => undef,
    default  => sub {
        my $base = {};
        for ( keys(%traits) ) {
            $base->{$_} = &$gauss( $traits{$_}{q1}, $traits{$_}{q2} );
        }
        return $base;
    },
);

has year => (
    is       => 'rwp',
    init_arg => undef,
    default  => 0,
);

has population => (
    is       => 'rwp',
    init_arg => undef,
    default  => 100,
);

has _population => (
    is       => 'ro',
    lazy     => 1,
    clearer  => 1,
    default  => sub { Population->new; },
    init_arg => undef,
);

has grain => (
    is       => 'rwp',
    init_arg => undef,
    default  => 4177,
);

has _grain => (
    is       => 'ro',
    clearer  => 1,
    lazy     => 1,
    default  => sub { Grain->new; },
    init_arg => undef,
);

has land => (
    is       => 'rwp',
    init_arg => undef,
    default  => 600,
);

has _land => (
    is       => 'ro',
    lazy     => 1,
    clearer  => 1,
    default  => sub { Land->new; },
    init_arg => undef,
);

has land_fertility => (
    is       => 'ro',
    init_arg => undef,
    default  => sub {
        {
            100 => 216,
            80  => 200,
            60  => 184,
            40  => 0,
            20  => 0,
            0   => 0,
        };
    },
);

has _war => (
    is       => 'ro',
    lazy     => 1,
    clearer  => 1,
    default  => sub { War->new; },
    init_arg => undef,
);

has yield => (
    is       => 'rwp',
    init_arg => undef,
    default  => 3.95,
);

has unrest => (
    is       => 'rwp',
    init_arg => undef,
    default  => 0,
);

has _unrest => (
    is       => 'ro',
    default  => 0,
    init_arg => undef,
);

has king_unrest => (
    is       => 'rwp',
    init_arg => undef,
    default  => 0,
);

has tax_paid => (
    is       => 'ro',
    init_arg => undef,
    default  => 0,
);

has _black_D => (
    is       => 'ro',
    init_arg => undef,
    default  => 0,
);

has input => (
    is       => 'rw',
    init_arg => undef,
    clearer  => 1,
    default  => undef,
);

has _steps => (
    is       => 'lazy',
    init_arg => undef,
    clearer  => 1,
    default  => sub { [@steps] },
);

has status => (
    is       => 'rwp',
    init_arg => undef,
    default  => RUNNING,
);

has _msg => (
    is       => 'rw',
    init_arg => undef,
    clearer  => 1,
    default  => undef,
);

has detail_report => (
    is       => 'ro',
    init_arg => undef,
    default  => '',
);

sub BUILD {
    my $self = shift;

    return;
}

# guarantee we have a clean input if needed.
before throw => sub {
    my $self = shift;

    $self->clear_input;

    return;
};

# intercept a "quit" request
around input => sub {
    my $orig  = shift;
    my $self  = shift;
    my $input = $_[0] || '';

    $self->_next_step('_quit_game') if $input =~ /^(?:q|quit)\s*$/i;

    return $self->$orig(@_);
};

sub input_is_yn {
    my $self = shift;

    my $value = $self->input;
    chomp($value) if defined($value);

    return !!( defined($value) && $value =~ /^(?:y|n)$/i );
}

sub input_is_value {
    my $self = shift;

    my $value = $self->input;
    chomp($value) if defined($value);

    return !!( defined($value) && ( $value =~ /^\d+$/ ) );
}

sub play_one_year {
    my $self   = shift;
    my $params = @_;

    return if $self->game_over;

    while ( @{ $self->_steps } ) {
        my $step = shift( @{ $self->_steps } );

        $self->$step;
        $self->clear_input;
    }

    $self->_prep_detail_report();

    $self->{tax_paid} += $self->_grain->taxes;
    $self->_clear_steps;
    $self->_clear_population;
    $self->_clear_grain;
    $self->_clear_land;
    $self->_clear_war;

    $self->_end_of_game_check;

    return;
}

sub game_over {
    my $self = shift;

    return !( $self->status == RUNNING );
}

sub _next_step {
    my $self = shift;
    my $next = shift;

    croak "Illegal value for '_next_step': $next"
      unless grep( /^$next$/, @settable_steps);

    return unshift( @{ $self->_steps }, $next );
}

sub _randomize {
    my $self  = shift;
    my $trait = shift;

    return int( &$fnr( -2, 2 ) + $self->_base_values->{$trait} );
}

sub _init_year {
    my $self = shift;

    ++$self->{year};

    $self->{_unrest} = 0;

    $self->_land->{price} =
      int( ( 2 * $self->yield ) + $self->_randomize('price') - 5 );
    $self->_land->{price} = MIN_LAND_PRICE
      if $self->_land->price < MIN_LAND_PRICE;

    $self->_land->{sell_price} = $self->_land->price;

    $self->{_msg} = $self->_summary_report;
    $self->{_msg} .= $self->_fertility_report;

    $self->_next_step('_display_msg');

    return;
}

sub _display_msg {
    my $self = shift;

    # a Moo clearer returns the existing value, if any, like delete does.
    $self->throw( $self->_clear_msg );
}

sub _summary_report {
    my $self = shift;

    my $msg = sprintf( "\nYear %d Peasants %d Land %d Grain %d Taxes %d\n",
        $self->year, $self->population, $self->land, $self->grain,
        $self->tax_paid );

    return $msg;
}

sub _fertility_report {
    my $self = shift;

    my $msg = "Land Fertility:\n";
    $msg .= " 100%  80%  60%  40%  20% Depl\n";
    for ( 100, 80, 60, 40, 20, 0 ) {
        $msg .= sprintf( "%5d", $self->land_fertility->{$_} );
    }
    $msg .= "\n";

    return $msg;
}

sub _feed_the_peasants {
    my $self = shift;

    my $hint = ( $self->grain / $self->population ) < 11 ? $self->grain : 14;

    $self->_next_step('_feed_the_peasants')
      and $self->throw(
        msg     => "Grain for food [$hint]: ",
        action  => 'get_value',
        default => $hint,
      ) unless $self->input_is_value;

    my $food = $self->input;

    # shortcut
    $food *= $self->population if ( $food < 100 && $self->grain > $food );

    if ( $food > $self->grain ) {
        $self->_next_step('_feed_the_peasants');

        $self->throw( $self->_insufficient_grain('feed') );
    }
    elsif (( ( $food / $self->population ) < 11 )
        && ( $food != $self->grain ) )
    {
        $self->{_unrest} += 3;

        $self->_next_step('_feed_the_peasants');

        my $msg = "The peasants demonstrate before the castle\n";
        $msg .= "with sharpened scythes\n\n";
        $self->throw($msg);
    }

    $self->_grain->{food} = -$food;
    $self->{grain} += $self->_grain->{food};

    return;
}

sub _starvation_and_unrest {
    my $self = shift;

    my $food = -$self->_grain->food;

    my $x1 = $food / $self->population;
    if ( $x1 < 13 ) {
        $self->_population->{starvations} =
          -int( ( $self->population - ( $food / 13 ) ) );
        $self->{population} += $self->_population->starvations;
    }

    # only allow bonus for extra food up to 18HL/peasant
    $x1 -= 14;
    $x1 = MAX_FOOD_BONUS if $x1 > MAX_FOOD_BONUS;

    $self->{_unrest} =
      $self->_unrest - ( 3 * $self->_population->starvations ) - ( 2 * $x1 );

    if ( $self->_population->starvations < 0 ) {
        $self->_msg("Some peasants have starved during the winter\n");
        $self->_next_step('_display_msg');
    }

    return ( ( $self->_unrest > 88 ) || ( $self->population < 33 ) );
}

sub _purchase_land {
    my $self = shift;

    my $land  = $self->_land;
    my $grain = $self->_grain;

    my $msg = '';

    $msg .= sprintf( "Land to buy at %d HL/HA [0]: ", int( $land->{price} ) );
    $self->_next_step('_purchase_land')
      and $self->throw( msg => $msg, action => 'get_value', default => 0 )
      unless $self->input_is_value();

    $self->_next_step('_sell_land') and return
      unless my $buy = $self->input;

    $self->_next_step('_purchase_land')
      and $self->throw( $self->_insufficient_grain('buy') )
      if ( $buy * $land->price > $self->grain );

    $self->land_fertility->{60} += $buy;
    $land->{trades} = $buy;
    $self->{land} += $buy;
    $grain->{trades} = -$buy * $land->{price};
    $self->{grain} += $grain->{trades};

    return;
}

sub _sell_land {
    my $self = shift;

    my $land  = $self->_land;
    my $grain = $self->_grain;

    if ( $land->price - $land->sell_price > MAX_SELL_TRIES ) {
        $grain->{trades} = 0;

        $self->throw("Buyers have lost interest\n");
    }

    my $price = --$land->{sell_price};

    my $msg = sprintf( "Land to sell at %d HL/HA [0]: ", $price );
    $self->_next_step('_sell_land')
      and $self->throw( msg => $msg, action => 'get_value', default => 0 )
      unless $self->input_is_value();

    return unless my $sold = $self->input;

    my $x1 = 0;
    for ( 100, 80, 60 ) {
        $x1 += $self->land_fertility->{$_};
    }

    $self->{_msg} = undef;
    if ( $sold > $x1 ) {
        $self->_next_step('_display_msg');
        $self->{_msg} = sprintf( "You only have %d HA. of good land\n", $x1 );
    }
    elsif ( ( $grain->{trades} = $sold * $price ) > MAX_SALE ) {
        $self->_next_step('_display_msg');
        $self->{_msg} = "No buyers have that much grain - sell less\n";
    }
    return if $self->_msg;

    $land->{trades} = -$sold;

    my $valid = 0;
    my $sold_q;
    for ( 60, 80, 100 ) {
        $sold_q = $_;
        if ( $sold <= $self->land_fertility->{$_} ) {
            $valid = 1;
            last;
        }
        else {
            $sold -= $self->land_fertility->{$_};
            $self->land_fertility->{$_} = 0;
        }
    }

    if ( !$valid ) {
        my $msg = "LAND SELLING LOOP ERROR - CONTACT PROGRAM AUTHOR IF\n";
        $msg .= "ERROR IS NOT YOURS IN ENTERING PROGRAM,\n";
        $msg .= "AND SEEMS TO BE FAULT OF PROGRAM'S LOGIC.\n";

        die $msg;
    }

    $self->land_fertility->{$sold_q} -= $sold;
    $self->{land} += $land->trades;

    $self->_set_status(ABOLISHED) if $self->land < 10;

    $msg = '';
    if ( ( $price < MIN_LAND_PRICE ) && $sold ) {
        $grain->{trades} = int( $grain->{trades} / 2 );
        $msg = "\nThe High King appropriates half your earnings\n";
        $msg .= "as punishment for selling at such a low price\n";
    }

    $self->{grain} += $grain->{trades};
    $self->throw($msg) if $msg;

    return;
}

sub _war_with_the_king {
    my $self = shift;

    $self->_king_wants_war if $self->king_unrest > 0;

    return if $self->king_unrest > -2;

    my $mercs = int( $self->grain / 100 );

    my $msg = "\nThe King's army is about to attack your duchy\n";
    $msg .= sprintf( "You have hired %d foreign mercenaries\n", $mercs );
    $msg .= "at 100 HL. each (payment in advance)\n\n";

    # assuming a population > 200 at the time of your revolt, # the C source
    # i ported from allowed one to win with as few as 5 mercs.
    # if ( ( $self->grain * $mercs ) + $self->population > 2399 ) {
    #
    # the Java source changed it so it took significantly more, about 275 but
    # was still a fixed value.
    # if ( ( 8 * $mercs ) + $self->population > 2399 ) {
    #
    # i've added an element of chance. again, assuming a populaton of 200, it
    # now requires anywhere from 219 to 366 mercs to win depending on the
    # quality of merc you hire. this means you must have at least 22,000 in
    # grain to win, and as much as 37,000 if your mercs suck.
    if ( ( int( $self->_randomize('merc_quality') ) * $mercs ) +
        $self->population > 2399 )
    {
        $msg .= "Wipe the blood from the crown - you are now High King!\n\n";
        $msg .= "A nearby monarchy threatens war; ";
        $msg .= "how many .........\n\n\n\n";

        $self->_set_status(KINGDOM);
    }
    else {
        $msg .= "The placement of your head atop the castle gate signifies\n";
        $msg .= "that the High King has abolished your Ducal right\n\n";

        $self->_set_status(ABOLISHED);
    }

    $self->{_msg}   = $msg;
    $self->{_steps} = ['_display_msg'];

    return;
}

sub _king_wants_war {
    my $self = shift;

    return unless $self->king_unrest > 0;

    my $msg = "\nThe King demands twice the royal tax in the\n";
    $msg .= 'hope of provoking war.  Will you pay? [Y/n]: ';

    $self->_next_step('_king_wants_war')
      and $self->throw( msg => $msg, action => 'get_yn', default => 'Y' )
      unless $self->input_is_yn;

    my $ans = $self->input;
    $ans ||= 'Y';

    $self->_set_king_unrest( ( $ans =~ /^n/i ) ? -1 : 2 );

    return;
}

sub _grain_production {
    my $self = shift;

    my $done = 0;

    my $pop_plant   = $self->population * LABOR_CAPACITY;
    my $grain_plant = int( $self->grain / SEED_PER_HA );
    my $max_grain_plant =
      $grain_plant > $self->land ? $self->land : $grain_plant;
    my $max_plant =
      $pop_plant > $max_grain_plant ? $max_grain_plant : $pop_plant;

    my $msg = '';

    $msg .= sprintf( "Land to plant [%d]: ", $max_plant );
    $self->_next_step('_grain_production')
      and $self->throw(
        msg     => $msg,
        action  => 'get_value',
        default => $max_plant
      ) unless $self->input_is_value();

    my $plant = $self->input || $max_plant;

    my $grain = $self->_grain;
    $msg = '';

    if ( $plant > $self->land ) {
        $msg = "You don't have enough land\n";
        $msg .= sprintf( "You only have %d HA. of land left\n", $self->land );
    }
    if ( $plant > ($pop_plant) ) {
        $msg = "You don't have enough peasants\n";
        $msg .= sprintf( "Your peasants can only plant %d HA. of land\n",
            $pop_plant );
    }
    $grain->{seed} = -( SEED_PER_HA * $plant );
    if ( -$grain->seed > $self->grain ) {
        $msg = $self->_insufficient_grain('plant');
    }

    if ($msg) {
        $self->_next_step('_grain_production');
        $self->throw($msg);
    }

    $grain->{yield} = $plant;
    $self->_land->{planted} = $plant;
    $self->{grain} += $grain->seed;

    my $tmp_quality = $self->_update_land_tables($plant);
    $self->_crop_yield_and_losses($tmp_quality);

    return;
}

sub _update_land_tables {
    my $self  = shift;
    my $plant = shift;

    my $valid = 0;

    my %tmp_quality = (
        100 => 0,
        80  => 0,
        60  => 0,
        40  => 0,
        20  => 0,
        0   => 0,
    );

    my $quality = $self->land_fertility;

    my $qfactor;
    for (qw( 100 80 60 40 20 0 )) {
        $qfactor = $_;
        if ( $plant <= $quality->{$qfactor} ) {
            $valid = 1;
            last;
        }
        else {
            $plant -= $quality->{$qfactor};
            $tmp_quality{$qfactor} = $quality->{$qfactor};
            $quality->{$qfactor} = 0;
        }
    }

    if ( !$valid ) {
        warn "LAND TABLE UPDATING ERROR - PLEASE CONTACT PROGRAM AUTHOR\n";
        warn "IF ERROR IS NOT A FAULT OF ENTERING THE PROGRAM, BUT RATHER\n";
        warn "FAULT OF THE PROGRAM LOGIC.\n";

        exit(1);
    }

    $tmp_quality{$qfactor} = $plant;
    $quality->{$qfactor} -= $plant;
    $quality->{100} += $quality->{80};
    $quality->{80} = 0;

    for ( 60, 40, 20, 0 ) {
        $quality->{ $_ + 40 } += $quality->{$_};
        $quality->{$_} = 0;
    }

    for ( 100, 80, 60, 40, 20 ) {
        $quality->{ $_ - 20 } += $tmp_quality{$_};
    }

    $quality->{0} += $tmp_quality{0};

    return \%tmp_quality;
}

sub _crop_yield_and_losses {
    my $self  = shift;
    my $tmp_q = shift;

    $self->{_msg} = '';

    $self->{yield} = $self->_randomize('yield') + 3;
    if ( !( $self->year % 7 ) ) {
        $self->{_msg} .= "Seven year locusts\n";
        $self->{yield} /= 2;
    }

    my $x1 = 0;
    for ( 100, 80, 60, 40, 20 ) {
        $x1 += $tmp_q->{$_} * ( $_ / 100 );
    }

    my $grain = $self->_grain;

    if ( $self->_land->planted == 0 ) {
        $self->{yield} = 0;
    }
    else {
        $self->{yield} =
          int( $self->yield * ( $x1 / $self->_land->planted ) * 100 ) / 100;
    }
    $self->{_msg} .= sprintf( "Yield = %0.2f HL./HA.\n", $self->yield );

    $x1 = $self->_randomize('spoilage') + 3;
    unless ( $x1 < 9 ) {
        $grain->{spoilage} = -int( ( $x1 * $self->grain ) / 83 );
        $self->{grain} += $grain->{spoilage};
        $self->{_msg} .= "Rats infest the grainery\n";
    }

    $self->_next_step('_display_msg');

    return;
}

sub _kings_levy {
    my $self = shift;

    return if ( $self->population < 67 ) || ( $self->king_unrest == -1 );

    # there is an edge case where entering an invalid answer might allow
    # one to avoid this, but ... who cares
    my $x1 = $self->_randomize('levies');
    return if $x1 > ( $self->population / 30 );

    my $msg = sprintf( "\nThe High King requires %d peasants for his estates ",
        int($x1) );
    $msg .= "and mines.\n";
    $msg .= sprintf( "Will you supply them or pay %d ", int( $x1 * 100 ) );
    $msg .= "HL. of grain instead [Y/n]: ";

    $self->_next_step('_kings_levy')
      and $self->throw( msg => $msg, action => 'get_yn', default => 'Y' )
      unless $self->input_is_yn();

    if ( $self->input =~ /^n/i ) {
        $self->_grain->{taxes} = -100 * $x1;
        $self->{grain} += $self->_grain->{taxes};
    }
    else {
        $self->_population->{levy} = -int($x1);
        $self->{population} += $self->_population->{levy};
    }

    return;
}

# TODO: find names for the "magic numbers" and change them to constants
sub _war_with_neigbor {
    my $self = shift;

    if ( $self->king_unrest == -1 ) {
        $self->{_msg} = "\nThe High King calls for peasant levies\n";
        $self->{_msg} .= "and hires many foreign mercenaries\n";

        $self->{king_unrest} = -2;
    }
    else {
        my $war = $self->_war;

        # are you worth coming after?
        $war->{tension} = int( 11 - ( 1.5 * $self->yield ) );
        $war->{tension} = 2 if ( $war->tension < 2 );

        if (   $self->king_unrest
            || ( $self->population <= 109 )
            || ( ( 17 * ( $self->land - 400 ) + $self->grain ) <= 10600 ) )
        {
            $war->{desire} = 0;
        }
        else {
            $self->{_msg} = "\nThe High King grows uneasy and may\n";
            $self->{_msg} .= "be subsidizing wars against you\n";

            $war->{tension} += 2;
            $war->{desire} = $self->year + 5;
        }

        $war->{risk} = int( $self->_randomize('war') );
        $self->_next_step('_first_strike') if $war->tension > $war->risk;

        $war->{first_strike} =
          int(
            $war->{desire} + 85 + ( 18 * $self->_randomize('first_strike') ) );
    }
    $self->_next_step('_display_msg') if $self->_msg;

    return;
}

sub _first_strike {
    my $self = shift;

    my $war = $self->_war;
    $war->{will} = 1.2 - ( $self->_unrest / 16 );
    my $resistance = int( $self->population * $war->will ) + 13;

    my $msg = "A nearby Duke threatens war; Will you attack first [y/N]? ";

    $self->_next_step('_first_strike')
      and $self->throw( msg => $msg, action => 'get_yn', default => 'N' )
      unless $self->input_is_yn();

    my $population = $self->_population;

    $self->{_msg} = '';
    if ( $self->input !~ /^n/i ) {
        if ( $war->{first_strike} >= $resistance ) {
            $self->_next_step('_goto_war');
            $self->{_msg} = "First strike failed - you need professionals\n";
            $population->{casualties} = -$war->risk - $war->tension - 2;
            $war->{first_strike} += ( 3 * $population->casualties );
        }
        else {
            $self->{_msg} = "Peace negotiations were successful\n";

            $population->{casualties} = -$war->tension - 1;
            $war->{first_strike}      = 0;
        }
        $self->{population} += $population->casualties;
        if ( $war->first_strike < 1 ) {
            $self->{_unrest} -=
              ( 2 * $population->casualties ) + ( 3 * $population->looted );
        }
    }
    else {
        $self->_next_step('_goto_war');
    }
    $self->_next_step('_display_msg') if $self->_msg;

    return;
}

sub _goto_war {
    my $self = shift;

    my $possible = int( $self->grain / 40 );
    $possible = 75 if $possible > 75;
    $possible = 0  if $possible < 0;

    my $msg = "Hire how many mercenaries at 40 HL each [$possible]? ";
    $self->_next_step('_goto_war')
      and $self->throw(
        msg     => $msg,
        action  => 'get_value',
        default => $possible
      ) unless $self->input_is_value();

    my $hired = $self->input || $possible;

    if ( $hired > 75 ) {
        my $msg = "There are only 75 mercenaries available for hire\n";
        $self->_next_step('_goto_war');

        $self->throw($msg);
    }

    my $war  = $self->_war;
    my $land = $self->_land;

    my $resistance = int( ( $self->population * $war->will ) + ( 7 * $hired ) + 13 );

    $war->{desire} = int( $war->desire * WAR_CONSTANT );

    my $x6 = $war->desire - ( 4 * $hired ) - int( $resistance / 4 );
    $war->{desire}  = $resistance - $war->desire;
    $land->{spoils} = int( 0.8 * $war->desire );
    if ( -$land->spoils > int( 0.67 * $self->land ) ) {
        $self->{_steps} = [];
        $self->_set_status(ABOLISHED);

        my $msg = "You have been overrun and have lost the entire Dukedom\n";
        $msg .= "The placement of your head atop the castle gate\n";
        $msg .= "signifies that ";
        $msg .= "the High King has abolished your Ducal right\n\n";

        $self->throw($msg);
    }

    my $x1 = $land->spoils;

    my $fertility = $self->land_fertility;
    for ( 100, 80, 60 ) {
        my $x3 = int( $x1 / ( 3 - ( 5 - ( $_ / 20 ) ) ) );
        if ( -$x3 <= $fertility->{$_} ) {
            $resistance = $x3;
        }
        else {
            $resistance = -$fertility->{$_};
        }
        $fertility->{$_} += $resistance;
        $x1 = $x1 - $resistance;
    }
    for ( 40, 20, 0 ) {
        if ( -$x1 <= $fertility->{$_} ) {
            $resistance = $x1;
        }
        else {
            $resistance = -$fertility->{$_};
        }
        $fertility->{$_} += $resistance;
        $x1 = $x1 - $resistance;
    }

    my $grain = $self->_grain;

    $msg = '';
    if ( $land->spoils < 399 ) {
        if ( $war->desire >= 0 ) {
            $msg = "You have won the war\n";

            $war->{grain_damage} = 0.67;
            $grain->{spoils}     = int( 1.7 * $land->spoils );
            $self->grain += $grain->spoils;
        }
        else {
            $msg = "You have lost the war\n";

            $war->{grain_damage} =
              int( ( $grain->yield / $self->land ) * 100 ) / 100;
        }
        if ( $x6 <= 9 ) {
            $x6 = 0;
        }
        else {
            $x6 = int( $x6 / 10 );
        }
    }
    else {
        $msg = "You have overrun the enemy and annexed his entire Dukedom\n";

        $grain->{spoils} = 3513;
        $self->{grain} += $grain->spoils;
        $x6 = -47;
        $war->{grain_damage} = 0.55;
        if ( $self->king_unrest <= 0 ) {
            $self->{king_unrest} = 1;
            $msg .= "The King fears for his throne and\n";
            $msg .= "may be planning direct action\n";
        }
    }

    $x6 = $self->population if ( $x6 > $self->population );

    my $population = $self->_population;

    $population->{casualties} -= $x6;
    $self->{population}       -= $x6;
    $grain->{yield} += int( $war->grain_damage * $land->spoils );
    $x6 = 40 * $hired;
    if ( $x6 <= $self->grain ) {
        $grain->{wages} = -$x6;

        # what is P[5] (looted) in this case?
    }
    else {
        $grain->{wages} = -$self->grain;
        $population->{looted} = -int( ( $x6 - $self->grain ) / 7 ) - 1;
        $msg .= "There isn't enough grain to pay the mercenaries\n";
    }
    $self->{grain} += $grain->wages;

    --$self->{population} if ( -$population->looted > $self->population );

    $self->{population} += $population->looted;
    $self->{land}       += $land->spoils;
    $self->{_unrest} -=
      ( 2 * $population->casualties ) - ( 3 * $population->looted );

    $self->_next_step('_display_msg') if $self->{_msg} = $msg;

    return;
}

sub _population_changes {
    my $self = shift;

    my $x1 = $self->_randomize('disease');

    my $population = $self->_population;
    my $x2;
    if ( $x1 <= 3 ) {
        if ( $x1 != 1 ) {
            $self->{_msg} = "A POX EPIDEMIC has broken out\n";
            $self->_next_step('_display_msg');

            $x2 = $x1 * 5;
            $population->{diseased} = -int( $self->population / $x2 );
            $self->{population} += $population->diseased;
        }
        elsif ( $self->_black_D <= 0 ) {
            $self->{_msg} = "The BLACK PLAGUE has struck the area\n";
            $self->_next_step('_display_msg');

            $self->{_black_D}       = 13;
            $x2                     = 3;
            $population->{diseased} = -int( $self->population / $x2 );
            $self->{population} += $population->diseased;
        }
    }

    $x1 = $population->looted ? 4.5 : $self->_randomize('birth') + 4;

    $population->{births} = int( $self->population / $x1 );
    $population->{deaths} = int( 0.3 - ( $self->population / 22 ) );
    $self->{population} += $population->deaths + $population->births;

    --$self->{_black_D};

    return;
}

sub _harvest_grain {
    my $self = shift;

    my $grain = $self->_grain;

    $grain->{yield} = int( $self->yield * $self->_land->planted );
    $self->{grain} += $grain->yield;

    my $x1 = $grain->yield - 4000;
    $grain->{expense} = -int( 0.1 * $x1 ) if $x1 > 0;

    $grain->{expense} -= MIN_EXPENSE;
    $self->{grain} += $grain->expense;

    # you've already told the King what to do with his taxes, he's coming
    # to collect them (and more) in person now.
    return if $self->king_unrest < 0;

    my $tax_rate = $self->king_unrest >= 2 ? TAX_RATE * 2 : TAX_RATE;
    $x1 = -int( $self->land * $tax_rate );

    if ( -$x1 > $self->grain ) {
        $self->{_msg} = "You have insufficient grain to pay the royal tax\n";
        $self->{_msg} .= "the High King has abolished your Ducal right\n\n";
        $self->_next_step('_display_msg');

        $self->_set_status(ABOLISHED);
        return 1;
    }
    $grain->{taxes} += $x1;
    $self->{grain}  += $x1;

    return;
}

sub _update_unrest {
    my $self = shift;

    $self->{unrest} = int( $self->unrest * UNREST_FACTOR ) + $self->_unrest;

    return;
}

sub _quit_game {
    my $self = shift;

    # empty the stack, don't clear it or it will re-initialize!
    $self->{_steps} = [];
    $self->_set_status(QUIT_GAME);

    return;
}

sub _end_of_game_check {
    my $self = shift;

    my $msg = '';

    if ( $self->status eq QUIT_GAME ) {
        $msg = "\nYou have conceded the game\n\n";
    }
    elsif (( $self->grain < MIN_GRAIN )
        || ( $self->_unrest > MAX_1YEAR_UNREST )
        || ( $self->unrest > MAX_TOTAL_UNREST ) )
    {
        $msg = "\nThe peasants tire of war and starvation\n";
        $msg .= "You are deposed!\n\n";

        $self->_set_status(DEPOSED);
    }
    elsif ( $self->population < MIN_POPULATION ) {
        $msg = "You have so few peasants left that\n";
        $msg .= "the High King has abolished your Ducal right\n\n";

        $self->_set_status('ABOLISHED');
    }
    elsif ( $self->land < MIN_LAND ) {
        $msg = "You have so little land left that\n";
        $msg .= "the High King has abolished your Ducal right\n\n";

        $self->_set_status(ABOLISHED);
    }
    elsif ( $self->year >= MAX_YEAR && !$self->king_unrest ) {
        $msg = "You have reached the age of mandatory retirement\n\n";

        $self->_set_status(RETIRED);
    }

    $self->throw($msg) if $self->game_over;

    return;
}

sub _insufficient_grain {
    my $self   = shift;
    my $action = shift;

    my %msgs = (
        feed => sprintf( "You have %d HL. of grain left,\n", $self->grain ),
        buy  => sprintf( "Enough to buy %d HA. of land\n",
            int( $self->grain / $self->_land->{price} ) ),
        plant => sprintf( "Enough to plant %d HA. of land\n\n",
            int( $self->grain / SEED_PER_HA ) ),
    );

    my $msg = "You don't have enough grain\n";
    $msg .= $msgs{$action};

    return $msg;
}

sub _prep_detail_report {
    my $self = shift;

    my $msg = "\n";
    for ( sort( keys( %{ $self->_population } ) ) ) {
        $msg .= sprintf( "%-20.20s %d\n", $_, $self->_population->$_ );
    }
    $msg .= sprintf( "%-20.20s %d\n\n", "Peasants at end", $self->population );

    for ( sort( keys( %{ $self->_land } ) ) ) {
        $msg .= sprintf( "%-20.20s %d\n", $_, $self->_land->$_ );
    }
    $msg .= sprintf( "%-20.20s %d\n\n", "Land at end", $self->land );

    for ( sort( keys( %{ $self->_grain } ) ) ) {
        $msg .= sprintf( "%-20.20s %d\n", $_, $self->_grain->$_ );
    }
    $msg .= sprintf( "%-20.20s %d\n\n", "Grain at end", $self->grain );

    for ( sort( keys( %{ $self->_war } ) ) ) {
        $msg .= sprintf( "%-20.20s %d\n", $_, $self->_war->$_ );
    }

    $self->{detail_report} = $msg;

    return;
}

1;

__END__