module.exports = {
    begin(creep){
        if(!creep.memory.harvesting) creep.memory.harvesting = false;
        if(!creep.memory.counter) creep.memory.counter = 0;
    },
    
    tick(creep){
        if(creep.memory.harvesting) {            
            pickUpEnergy(creep);
            onEnergyFullTurnToJobMode(creep);
        }
        else {
            performJobs(creep);
            onOutOfEnergyTurnHarvestingMode(creep);
        }
    }
}

function pickUpEnergy(creep){
    if(!creep.memory.target) {
        const target = creep.pos.findClosestByRange(FIND_DROPPED_RESOURCES, {filter: {resourceType: RESOURCE_ENERGY}});
        if(target) creep.memory.target = target.id;
    }
    const resource = Game.getObjectById(creep.memory.target);
    if(!resource) creep.memory.target = undefined;
    if(creep.pos.isNearTo(resource)) creep.pickup(resource);
    else creep.moveTo(resource);
}

function harvestSource(creep){
    if(!creep.memory.target) creep.memory.target = getSourceIdFromRoomTable(creep);
    var source = Game.getObjectById(creep.memory.target);
    if(creep.pos.isNearTo(source)) creep.harvest(source);
    else creep.moveTo(source);
}

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

function performJobs(creep){
    if(!creep.memory.target) creep.memory.target = getJobTarget(creep); 
    var target = Game.getObjectById(creep.memory.target);          
    if(creep.pos.isNearTo(target)) doJob(creep, target);
    else creep.moveTo(target);
}

function onOutOfEnergyTurnHarvestingMode(creep){
    if(!creep.store.getUsedCapacity(RESOURCE_ENERGY)) {
        creep.memory.harvesting = true;
        creep.memory.target = undefined; 
        creep.memory.counter += 1;
    }
}

function getSourceIdFromRoomTable(creep) {
    const sourceTable = creep.room.memory.layout.sources; 
    const sourceIterator = creep.memory.counter%creep.room.memory.layout.sources.length;
    const sourceId = sourceTable[sourceIterator];
    return sourceId;
}

function getJobTarget(creep) {
    var target;
    switch (creep.memory.counter%4) {
        case 0: target = creep.room.controller; break;
        case 1: target = creep.pos.findClosestByRange(FIND_MY_STRUCTURES, {filter:{structureType:STRUCTURE_SPAWN}}); break;
        case 2: target = creep.pos.findClosestByRange(FIND_MY_CONSTRUCTION_SITES); break;
        case 3: target = creep.pos.findClosestByRange(FIND_MY_STRUCTURES, {filter:(s)=>{return s.hitsMax != s.hits;}}); break;
    }
    if(target) return target.id;
    creep.memory.counter++;
    return undefined;
}

function doJob(creep, target){
    var response;
    switch (creep.memory.counter%4) {
        case 0: response = creep.upgradeController(target); break;
        case 1: response = creep.transfer(target, RESOURCE_ENERGY); break;
        case 2: response = creep.build(target); break;
        case 3: response = creep.repair(target); break;
    }
    if(response == ERR_FULL) {
        creep.memory.counter++;
        creep.memory.target = undefined; 
    }
}