'use strict';
var Drone = require('drone');
var blocks = require('blocks');
//
// constructs a medieval fort
// 
function fort( side, height ) {
  var turret,
    i,
    torch;

  if ( typeof side == 'undefined' ) {
    side = 18;
  }
  if ( typeof height == 'undefined' ) { 
    height = 6;
  }
  // make sure side is even
  if ( side % 2 ) {
    side++;
  }
  var battlementWidth = 3;
  if ( side <= 12 ) {
    battlementWidth = 2;
  }
  if ( height < 4 || side < 10 ) {
    throw new java.lang.RuntimeException('Forts must be at least 10 wide X 4 tall');
  }
  //
  // build walls.
  //
  this
    .chkpt('fort')
    .down()
    .chessboard( blocks.wool.black, blocks.wool.white, side)
    .up()
    .box0( blocks.brick.stone, side, height - 1, side)
    .up(height-1);
  //
  // build battlements
  //
  for ( i = 0; i <= 3; i++ ) {

    turret = [
      blocks.stairs.stone ,
      blocks.stairs.stone + ':'+ Drone.PLAYER_STAIRS_FACING[ (this.dir + 2) % 4 ]
    ];
    this
      .box( blocks.brick.stone ) // solid brick corners
      .up()
      .box(blocks.torch)
      .down() // light a torch on each corner
      .fwd()
      .boxa( turret, 1, 1, side-2)
      .fwd( side-2 )
      .turn();
  }
  //
  // build battlement's floor
  //
  this
    .move('fort')
    .up(height-2)
    .fwd()
    .right();

  for ( i = 0; i < battlementWidth; i++ ) { 

    this
      .box0(blocks.slab.oak, side - ( 2 + (i * 2) ), 1, side - ( 2 + ( i * 2) ))
      .fwd()
      .right();
  }
  //
  // add door
  //
  torch = blocks.torch + ':' + Drone.PLAYER_TORCH_FACING[this.dir];
  this
    .move('fort')
    .right((side/2)-1)
    .door2() // double doors
    .back()
    .left()
    .up()
    .box(torch) // left torch
    .right(3)
    .box(torch); // right torch
  //
  // add ladder up to battlements
  //
  this
    .move('fort')
    .right((side/2)-3)
    .fwd(1) // move inside fort
    .turn(2)
    .box(blocks.air, 1, height-1, 1)
    .ladder(height-1)
    .move('fort');
}
Drone.extend(fort);