tower.js

let towerDefense = {
    run: function (myRoomName) {
        var hostiles = Game.rooms[myRoomName].find(FIND_HOSTILE_CREEPS);
        var hostileHealers = Game.rooms[myRoomName].find(FIND_HOSTILE_CREEPS, {
            filter: (s) => (s.getActiveBodyparts(HEAL) > 0)
        });
        var hostileAttackers = Game.rooms[myRoomName].find(FIND_HOSTILE_CREEPS, {
            filter: (s) => (s.getActiveBodyparts(ATTACK) > 0 || s.getActiveBodyparts(RANGED_ATTACK) > 0)
        });
        var hostiles = Game.rooms[myRoomName].find(FIND_HOSTILE_CREEPS);
        var towers = Game.rooms[myRoomName].find(FIND_MY_STRUCTURES, {
            filter: {
                structureType: STRUCTURE_TOWER
            }
        });
        var healerHit = false;
        //Alternative to finding towers: // var towers = _.filter(Game.structures, s => s.structureType == STRUCTURE_TOWER); //if there are hostileHealers - attakc them 
        if (hostileHealers.length > 0 && healerHit == false) {
            towers.forEach(tower => tower.attack(hostileHealers[0]));
            healerHit = true;
        }
        //if there are hostileAttackers - attakc them 
        else if (hostileAttackers.length > 0) {
            towers.forEach(tower => tower.attack(hostileAttackers[0]));
            healerHit = false;
        }
        //if there are ANY Hostiles - attakc them 
        else if (hostiles.length > 0) {
            towers.forEach(tower => tower.attack(hostiles[0]));
            healerHit = false;
        }
        //if there are no hostiles.... 
        if (hostiles.length === 0) {

            //....first heal any damaged creeps 
            for (let name in Game.creeps) {
                // get the creep object 
                var creep = Game.creeps[name];
                if (creep.hits < creep.hitsMax) {
                    towers.forEach(tower => tower.heal(creep));
                }
            }
            for (var i in towers) {
                //...repair Buildings! :) But ONLY until HALF the energy of the tower is gone. 
                //Because we don't want to be exposed if something shows up at our door :) 
                if (towers[i].energy > towers[i].energyCapacity / 10) {

                    var repairitnow = towers[i].pos.findClosestByRange(FIND_STRUCTURES, {
                        filter: (s) => {
                            return (s.hits < s.hitsMax / 2000 && s.hits < 1000);
                        }
                    });
                    //Find the closest damaged Structure
                    var closestDamagedStructure = towers[i].pos.findClosestByRange(FIND_STRUCTURES, {
                        filter: (s) => s.hits < s.hitsMax / 1000 && s.hits < 1000 && s.hits > 0 && s.structureType != STRUCTURE_WALL
                    });
                    if (repairitnow) {
                        towers[i].repair(repairitnow);
                    } else if (closestDamagedStructure) {
                        towers[i].repair(closestDamagedStructure);
                    }
                }
            }

        }
    }
}

module.exports = towerDefense;