module.exports = {
    begin(creep){
        if(!creep.memory.collecting) creep.memory.collecting = false;
        if(!creep.memory.counter) creep.memory.counter = 0;
    },
    
    tick(creep){
        if(creep.memory.collecting) {            
            GetEnergy(creep);
            energyFullCheck(creep);
        }
        else {
            BuildOrRepair(creep);
            energyEmptyCheck(creep);
        }
    }
}

function GetEnergy(creep){
    if(!creep.memory.target) findEnergyTarget(creep);
    const target = Game.getObjectById(creep.memory.target);
    if(!target) creep.memory.target = undefined;
    if(creep.pos.isNearTo(target)) {
        if(!target.store) creep.pickup(target);
        else creep.withdraw(target, RESOURCE_ENERGY);
    }
    else creep.moveTo(target);
}

function energyFullCheck(creep){
    if(!creep.store.getFreeCapacity(RESOURCE_ENERGY)) {
        creep.memory.collecting = false;
        creep.memory.target = undefined; 
    }
}

function BuildOrRepair(creep){
    if(!creep.memory.target) findBuildOrRepairTarget(creep);
    if(!creep.memory.target) return;
    const target = Game.getObjectById(creep.memory.target);
    if(!target) { creep.memory.target = undefined; return; }
    if(target.hits && target.hits === target.hitsMax) { creep.memory.target = undefined; return; }
    if(creep.pos.isNearTo(target)) 
        if(!target.hits) creep.build(target);
        else creep.repair(target);
    else creep.moveTo(target);
}

function energyEmptyCheck(creep){
    if(!creep.store.getUsedCapacity(RESOURCE_ENERGY)) {
        creep.memory.collecting = true;
        creep.memory.target = undefined; 
    }
}

function findEnergyTarget(creep){
    var target;
    if(creep.room.storage.store.getUsedCapacity(RESOURCE_ENERGY) > creep.store.getFreeCapacity(RESOURCE_ENERGY))
        target = creep.room.storage;
    if(!target) target = creep.pos.findClosestByRange(FIND_STRUCTURES, {
        filter: (st)=>{ 
            return st.structureType == STRUCTURE_CONTAINER && st.store.getUsedCapacity(RESOURCE_ENERGY) > creep.store.getFreeCapacity(RESOURCE_ENERGY);
        }});
    
    if(!target) target = creep.pos.findClosestByRange(FIND_DROPPED_RESOURCES, {
        filter: (r)=>{ 
            return r.resourceType == RESOURCE_ENERGY && r.amount > creep.store.getFreeCapacity(RESOURCE_ENERGY);
        }});    
    if(!target) target = creep.pos.findClosestByRange(FIND_RUINS, {
        filter: (r)=>{ 
            return r.store.getUsedCapacity(RESOURCE_ENERGY) > creep.store.getFreeCapacity(RESOURCE_ENERGY);
        }});    
    if(!target) target = creep.pos.findClosestByRange(FIND_TOMBSTONES, {
        filter: (t)=>{ 
            return t.store.getUsedCapacity(RESOURCE_ENERGY) > creep.store.getFreeCapacity(RESOURCE_ENERGY);
        }});
    
    if(target) creep.memory.target = target.id;
}

function findBuildOrRepairTarget(creep) {
    var target;
    switch (creep.memory.counter%2) {
        case 0: target = creep.pos.findClosestByRange(FIND_MY_CONSTRUCTION_SITES); break;
        case 1: target = creep.pos.findClosestByRange(FIND_STRUCTURES, {
            filter:(s)=> { 
                return s.hitsMax - s.hits 
                && s.structureType != STRUCTURE_WALL;
            }}); 
            break;
    }
    if(target) creep.memory.target = target.id;
    creep.memory.counter++;
}