var energyUtils = {
    gatherEnergy : function(creep) {
        var storage = creep.room.find(FIND_STRUCTURES, {
            filter: (structure) => {
                return (structure.structureType == STRUCTURE_CONTAINER) &&
                    structure.store.getUsedCapacity(RESOURCE_ENERGY) > 0;
            }
        });
        /**
        if(storage.length == 0){
            storage = creep.room.find(FIND_STRUCTURES, {
                filter: (structure) => {
                    return (structure.structureType == STRUCTURE_SPAWN) &&
                        structure.store.getUsedCapacity(RESOURCE_ENERGY) > 0;
                }
            });
        }
        **/
        if(creep.withdraw(storage[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
            creep.moveTo(storage[0], {visualizePathStyle: {stroke: '#ffaa00'}});
        }
    },
    depositEnergy : function(creep) {
        var targets = creep.room.find(FIND_STRUCTURES, {
            filter: (structure) => {
                return (structure.structureType == STRUCTURE_SPAWN ||
				structure.structureType == STRUCTURE_EXTENSION) &&
                    structure.store.getFreeCapacity(RESOURCE_ENERGY) > 0;
            }
        });
        if(targets.length == 0){
            targets = creep.room.find(FIND_STRUCTURES, {
                filter: (structure) => {
                    return (structure.structureType == STRUCTURE_CONTAINER ||
                        structure.structureType == STRUCTURE_TOWER) &&
                        structure.store.getFreeCapacity(RESOURCE_ENERGY) > 0;
                }
            });
        }
        if(targets.length > 0) {
            if(creep.transfer(targets[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
                creep.moveTo(targets[0], {visualizePathStyle: {stroke: '#ffffff'}});
            }
			return true;
        }
        return false;
    }
}

module.exports = energyUtils;