roles_transporter.js

var transporter = {
	parts: [
		[Game.CARRY, Game.CARRY, Game.MOVE, Game.MOVE]
	],

	action: function()
	{
		var creep = this.creep;

		//@TODO: Balance Spawns here

		if(creep.energy == 0)
		{
			var closestSpawn = creep.pos.findNearest(Game.MY_SPAWNS, {
				filter: function(spawn)
				{
					return spawn.energy > 0;
				}
			});

			creep.moveTo(closestSpawn);
			closestSpawn.transferEnergy(creep);

			return;
		}

		var target = null;

		//Transfer to builder
		if (!target) {
			var builderToHelp = creep.pos.findNearest(Game.MY_CREEPS, {
				filter: function (builder) {
					return builder.memory.role == "builder"
						&& builder.energy < ( builder.energyCapacity - 10);
				}
			});

			if (builderToHelp)
				target = builderToHelp;
		}

		if(!target)
		{
			var extension = creep.pos.findNearest(Game.MY_STRUCTURES, {
				filter: function(structure)
				{
					return structure.structureType == Game.STRUCTURE_EXTENSION &&
						structure.energy < structure.energyCapacity;
				}
			});

			if(extension)
				target = extension;
		}

		//Go to target and give it energy
		if (creep.pos.isNearTo(target)) {
			if (target.energy < target.energyCapacity) {
				creep.transferEnergy(target);
			}
		}
		else {
			creep.moveTo(target);
		}
	}
};

module.exports = transporter;