CookieClickerOptimalBuilding.js

/* For Cookie Clicker v. 2.0106
   coded on Chrome 66
    
    Figure out the optimal buildings to build
    by comparing production over price ratios
    
    Runs every second
    
    To stop the loop, refresh the page or type
    clearInterval(cookieInterval);
    in your JS console
*/

// The best building to buy is the one that cost the less Dollars per added cookies
// min ( costOfOneBuilding / prodOfOneBuilding)

// Example
// If the farm produce 5x as much as a Grandma, but only costs 4x as much
// It's better to build a Farm than a Grandma
// The Price of the Farm will increase faster that it's production
// So we will end up to an equilibrium where farmPrice/farmProd ~= grandmaPrice/grandmaProd
// Then extends to all buildings

var count = 0;
var margin = 0.05;

cookieInterval = setInterval(function(){
    console.log("Loop " + count);
    count += 1;

    var noBuy = false;

    // If there's no cursors, buy one
    if (Game.ObjectsById[0].amount == 0){
        Game.ObjectsById[0].buy(1);
    } else {
    
        var buildingsCostPerCookie = [];

        // 15 different buildings
        for (i=0; i<15; i++){
            var building = Game.ObjectsById[i];

            // Do not have a lower tier building at 0 !
            if (building.amount != 0){
                var Cpc = building.price / ((building.storedTotalCps / building.amount)*Game.globalCpsMult);
                buildingsCostPerCookie.push(+Cpc.toFixed(2));
            }
            
        }

        console.log(buildingsCostPerCookie);

        var lowestRatio = Math.min(...buildingsCostPerCookie);
        var bestBuildingId = buildingsCostPerCookie.indexOf(lowestRatio);

        // I want to be able to choose what to do next when we are at an equilibrium
        // The equilibirum happens when the lowestRatio is in the margin
        // of the max ratio. Then nothing is bought and some manual action is required
        // Good time to buy store updates or new buildings
        var highestRatio = Math.max(...buildingsCostPerCookie);

        if (lowestRatio > highestRatio*(1-margin)){
            console.log("No outstanding building to buy");
            noBuy = true;
        } else if (Game.cookies < Game.ObjectsById[bestBuildingId].price){
            console.log("Would build one " + Game.ObjectsById[bestBuildingId].name + " but not enough cookies");
            noBuy = true;
        } else {
            Game.ObjectsById[bestBuildingId].buy(10);
            console.log("Built one " + Game.ObjectsById[bestBuildingId].name);
        }

        // If nothing was built, try to build a new tier building
        if (noBuy){
            if (Game.cookies < Game.ObjectsById[buildingsCostPerCookie.length].price){
                console.log("Would build one " + Game.ObjectsById[buildingsCostPerCookie.length].name + " but not enough cookies");
            } else {
                Game.ObjectsById[buildingsCostPerCookie.length].buy(1);
                console.log("Built one " + Game.ObjectsById[buildingsCostPerCookie.length].name);
            }
            
        }
    }   

    //Bonus: if there is a golden cookie (shimmer), click on it
    if (Game.shimmers.length) {
        Game.shimmers[0].l.click();
        console.log("Clicked on a golden cookie!");
    }

    //Other Bonus: if there is an upgrade to buy, buy it
    if (Game.UpgradesInStore.length){
        if (Game.UpgradesInStore[0].basePrice < Game.cookies){
            console.log("Buying " + Game.UpgradesInStore[0].name + " upgrade");
            Game.UpgradesInStore[0].buy();
        }
    }

}, 1000);