using Model.Economy;
using Model.Entity;
using Model.Types;

namespace Services.Immortal;

public class EconomyService : IEconomyService
{
    private List<EconomyModel> buildEconomyOverTime = null!;

    private Dictionary<string, List<EconomyModel>> specficEconomiesOverTime = null!;

    public List<EconomyModel> GetOverTime()
    {
        return buildEconomyOverTime;
    }

    public void Subscribe(Action action)
    {
        OnChange += action;
    }

    public void Unsubscribe(Action action)
    {
        OnChange -= action;
    }

    public void Calculate(IBuildOrderService buildOrder, ITimingService timing, int fromInterval)
    {
        // We don't consider things mining at zero seconds
        if (fromInterval == 0) fromInterval = 1;

        //TODO Break all this up
        if (buildEconomyOverTime == null)
        {
            buildEconomyOverTime = new List<EconomyModel>();
            for (var interval = 0; interval < timing.GetAttackTime(); interval++)
                buildEconomyOverTime.Add(new EconomyModel { Interval = interval });
        }


        if (buildEconomyOverTime.Count > timing.GetAttackTime())
            buildEconomyOverTime.RemoveRange(timing.GetAttackTime(),
                buildEconomyOverTime.Count - timing.GetAttackTime());

        while (buildEconomyOverTime.Count < timing.GetAttackTime())
            buildEconomyOverTime.Add(new EconomyModel { Interval = buildEconomyOverTime.Count - 1 });

        for (var interval = fromInterval; interval < timing.GetAttackTime(); interval++)
        {
            buildEconomyOverTime[interval] = new EconomyModel();

            var economyAtSecond = buildEconomyOverTime[interval];

            CarryOverEconomyFromPreviousInterval(interval, economyAtSecond);

            SetupCurrentInverval(buildOrder, economyAtSecond, interval);
            AddPassivePyreGain(interval, economyAtSecond);
            float freeWorkers = economyAtSecond.WorkerCount - economyAtSecond.BusyWorkerCount;
            var workersNeeded = AddFundsFromHarvestPoints(economyAtSecond, freeWorkers);
            workersNeeded -= CalculateCreatingWorkerCosts(economyAtSecond);
            MakeNeededNewWorkersRequests(workersNeeded, economyAtSecond);
            SubtractFundsOnRequestedOrders(buildOrder, interval, economyAtSecond);
            HandledAddingNewHarvestPointsAndWorkersToEconomy(buildOrder, interval, economyAtSecond);
        }

        NotifyDataChanged();
    }


    public EconomyModel GetEconomy(int atInterval)
    {
        if (atInterval >= buildEconomyOverTime.Count) return buildEconomyOverTime.Last();

        return buildEconomyOverTime[atInterval];
    }

    private static void SetupCurrentInverval(IBuildOrderService buildOrder, EconomyModel economyAtSecond, int interval)
    {
        economyAtSecond.Interval = interval;
        economyAtSecond.HarvestPoints =
            (from harvester in buildOrder.GetHarvestPointsCompletedBefore(interval)
                select harvester).ToList();
    }

    private static void HandledAddingNewHarvestPointsAndWorkersToEconomy(IBuildOrderService buildOrder, int interval,
        EconomyModel economyAtSecond)
    {
        if (buildOrder.CompletedOrders.TryGetValue(interval, out var completedAtInterval))
            foreach (var newEntity in completedAtInterval)
            {
                var harvest = newEntity;
                if (harvest != null) economyAtSecond.HarvestPoints.Add(harvest);

                var production = newEntity.Production();
                if (production != null && production.RequiresWorker) economyAtSecond.BusyWorkerCount -= 1;
            }
    }

    private static void SubtractFundsOnRequestedOrders(IBuildOrderService buildOrder, int interval,
        EconomyModel economyAtSecond)
    {
        if (buildOrder.StartedOrders.TryGetValue(interval, out var ordersAtTime))
            foreach (var order in ordersAtTime)
            {
                var foundEntity = EntityModel.GetDictionary()[order.DataType];
                var production = foundEntity.Production();

                if (production != null)
                {
                    economyAtSecond.Alloy -= production.Alloy;
                    economyAtSecond.Ether -= production.Ether;
                    economyAtSecond.Pyre -= production.Pyre;
                    var finishedAt = interval + production.BuildTime;

                    if (production.RequiresWorker) economyAtSecond.BusyWorkerCount += 1;

                    if (production.ConsumesWorker) economyAtSecond.WorkerCount -= 1;
                }
            }
    }

    private static void MakeNeededNewWorkersRequests(int workersNeeded, EconomyModel economyAtSecond)
    {
        if (workersNeeded > economyAtSecond.CreatingWorkerCount)
        {
            economyAtSecond.CreatingWorkerCount += 1;
            economyAtSecond.CreatingWorkerDelays.Add(20);
        }
    }

    /**
     * Returns amount of workers created
     */
    private static int CalculateCreatingWorkerCosts(EconomyModel economyAtSecond)
    {
        var createdWorkers = 0;

        if (economyAtSecond.CreatingWorkerCount > 0)
            for (var i = 0; i < economyAtSecond.CreatingWorkerDelays.Count; i++)
                if (economyAtSecond.CreatingWorkerDelays[i] > 0)
                {
                    if (economyAtSecond.Alloy > 2.5f)
                    {
                        economyAtSecond.Alloy -= 2.5f;
                        economyAtSecond.CreatingWorkerDelays[i]--;
                    }
                }
                else
                {
                    economyAtSecond.CreatingWorkerCount -= 1;
                    economyAtSecond.WorkerCount += 1;
                    createdWorkers++;
                    economyAtSecond.CreatingWorkerDelays.Remove(i);
                    i--;
                }

        return createdWorkers;
    }

    /**
     * Returns needed workers to maximize harvest points
     */
    private static int AddFundsFromHarvestPoints(EconomyModel economyAtSecond, float freeWorkers)
    {
        var workersNeeded = 0;

        foreach (var entity in economyAtSecond.HarvestPoints)
        {
            var harvester = entity.Harvest();
            if (harvester.RequiresWorker)
                if (harvester.Resource == ResourceType.Alloy)
                {
                    var usedWorkers = Math.Min(harvester.Slots, freeWorkers);
                    economyAtSecond.Alloy += harvester.HarvestedPerInterval * usedWorkers;
                    freeWorkers -= usedWorkers;

                    if (usedWorkers < harvester.Slots) workersNeeded += 1;
                }

            if (harvester.RequiresWorker == false)
            {
                if (harvester.Resource == ResourceType.Ether)
                    economyAtSecond.Ether += harvester.HarvestedPerInterval * harvester.Slots;

                if (harvester.Resource == ResourceType.Alloy)
                    economyAtSecond.Alloy += harvester.HarvestedPerInterval * harvester.Slots;
            }
        }

        return workersNeeded;
    }

    private static void AddPassivePyreGain(int interval, EconomyModel economyAtSecond)
    {
        if (interval % 3 == 0) economyAtSecond.Pyre += 1;
    }

    private void CarryOverEconomyFromPreviousInterval(int interval, EconomyModel economyAtSecond)
    {
        if (interval > 0)
        {
            economyAtSecond.Alloy = buildEconomyOverTime[interval - 1].Alloy;
            economyAtSecond.Ether = buildEconomyOverTime[interval - 1].Ether;
            economyAtSecond.Pyre = buildEconomyOverTime[interval - 1].Pyre;
            economyAtSecond.WorkerCount = buildEconomyOverTime[interval - 1].WorkerCount;
            economyAtSecond.BusyWorkerCount = buildEconomyOverTime[interval - 1].BusyWorkerCount;
            economyAtSecond.CreatingWorkerCount = buildEconomyOverTime[interval - 1].CreatingWorkerCount;
            economyAtSecond.HarvestPoints = buildEconomyOverTime[interval - 1].HarvestPoints.ToList();
            economyAtSecond.CreatingWorkerDelays = buildEconomyOverTime[interval - 1].CreatingWorkerDelays.ToList();
        }
    }


    private event Action OnChange = null!;

    private void NotifyDataChanged()
    {
        OnChange?.Invoke();
    }
}