//
// define these primitive methods used by drone.js (and potentiall others)
//
//	 getPlayerPos returns the player's x,y,z and yaw (direction)
//	 getMousePos returns the x,y,z of the current block being targeted.
//	 putBlock(x,y,z,blockId,metadata) puts a block at a location in current world
//	 getBlock(x,y,z) gets the block and metadata (returned as a string in form '35:15') 
//	 putSign(texts,x,y,z,blockId,metadata) puts a sign at the given location
//	 notifyAdministrators(msg) sends a message to all admins/ops.
//	 echo(msg) prints a message on screen to current user.
//
(function(){

	 // 
	 // only execute once
	 //
	 if (typeof getPlayerPos != "undefined"){
		  return;
	 }

	 importPackage(org.bukkit.command);
	 importPackage(org.bukkit.block);
	 importPackage(org.bukkit.entity);

	 var _getPlayerPos = function(){
		  if (typeof __self == "undefined")
				return;
		  return __self.location;
	 };

	 var _getMousePos = function(){
		  if (typeof __self == "undefined")
				return;
		  // __self might be CONSOLE or a CommandBlock
		  if (!__self.getTargetBlock)
				return;
		  var targetedBlock = __self.getTargetBlock(null,5);
		  if (targetedBlock == null || targetedBlock.isEmpty()){
				return null;
		  }
		  return targetedBlock.location;
	 };

	 var _putBlock = function(x,y,z,blockId,metadata){
		  if (typeof metadata == "undefined"){
				metadata = 0;
		  }
		  var world = _getWorld();
		  if (world){
				var block = world.getBlockAt(x,y,z);
				block.setTypeId(blockId);
				block.setData(metadata);
		  }
		  // todo add support for trees.
	 };

	 var _putSign = function(texts, x, y, z, blockId, meta){
		  putBlock(x,y,z,blockId,meta);
		  var block = _getBlockObject(x,y,z);
		  state = block.state;
		  if (state instanceof Sign){
				for (var i = 0;i < texts.length; i++)
					 state.setLine(i%4,texts[i]);
				state.update(true);
		  }
	 };

	 var _getBlock = function(x,y,z){
		  var block = _getBlockObject(x,y,z);
		  if (block)
				return "" + block.typeId + ":" + block.data;
	 };

	 var _getBlockObject = function(x,y,z){
		  var world = _getWorld();
		  if (world)
				return world.getBlockAt(x,y,z);
	 };

	 var _getWorld = function(){
		  if (typeof __self == "undefined")
				return;
		  if (__self instanceof BlockCommandSender)
				return __self.block.location.world;
		  if (__self instanceof Player)
				return __self.location.world;
	 };
	 
	 var _notifyAdministrators = function(msg){
		  var ops = __plugin.server.operators;
		  for (var i = 0; i < ops.size();i++){
				if (ops[i].isOnline())
					 ops[i].player.chat(msg);
		  }
		  __plugin.logger.info(msg);
	 };
	 var _echo = function(msg){
		  __plugin.logger.info(msg);
		  if (typeof __self == "undefined"){
				java.lang.System.out.println(msg);
				return;
		  }
		  __self.sendMessage(msg);
	 };

	 getPlayerPos = _getPlayerPos;
	 getMousePos = _getMousePos;
	 putBlock = _putBlock;
	 getBlock = _getBlock;
	 putSign = _putSign;
	 notifyAdministrators = _notifyAdministrators;
	 echo = _echo;
	 
}());