var roleBuilder = {
    run: function(creep){
        if(creep.memory.building && creep.carry.energy == 0){
            creep.memory.building = false;
        }
        if (!creep.memory.building && creep.carry.energy == creep.carryCapacity){
            creep.memory.building = true;
        }
        if (creep.memory.building){
            var targets = creep.room.find(FIND_CONSTRUCTION_SITES);
            if(targets.length){
                if (creep.build(targets[0]) == ERR_NOT_IN_RANGE){
                    creep.moveTo(targets[0]);
                }
            }            

        } else {
            var sources = creep.room.find(FIND_SOURCES);
            if (creep.harvest(sources[0]) == ERR_NOT_IN_RANGE){
                creep.moveTo(sources[0]);
            }
        }
    }
}
module.exports = roleBuilder;