using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Serialization;
using Utility;
using Random = UnityEngine.Random;

[Serializable]
public struct DeveloperStats
{
    public double BaseEfficiency;
    public int Fingers;
    
    public double CaffeineDrainFactor;
    public double HungerDrainFactor;
    public double UrinationDrainFactor;
    public double HappinessDrainFactor;

    // TODO: Not yet used
    public double CoffeePreference;
    public double MatePreference;
    
    public DeveloperStats(double baseEfficiency, int fingers, double caffeineDrainFactor, double hungerDrainFactor, double urinationDrainFactor, double happinessDrainFactor, double coffeePreference, double matePreference)
    {
        BaseEfficiency = baseEfficiency;
        Fingers = fingers;
        CaffeineDrainFactor = caffeineDrainFactor;
        HungerDrainFactor = hungerDrainFactor;
        UrinationDrainFactor = urinationDrainFactor;
        HappinessDrainFactor = happinessDrainFactor;
        CoffeePreference = coffeePreference;
        MatePreference = matePreference;
    }
    
    public static readonly DeveloperStats Default = new DeveloperStats(1.0, 10, 1, 1, 1, 1, 0.5, 0.5);
}

public class Developer : MonoBehaviour
{
    private string _name;
    
    [SerializeField]
    private DeveloperStats _baseStats = DeveloperStats.Default;

    [SerializeField, ShowOnly]
    private double _currentEfficiency = 1.0;
    
    [SerializeField]
    private int _fingersLeft = 10;
    
    [SerializeField]
    private double _caffeineLevel = 1.0;
    
    [SerializeField]
    private double _hungerLevel = 1.0;
    
    [SerializeField]
    private double _urgeToUrinateLevel = 1.0;

    [SerializeField]
    private double _happiness = 0.75;
    
    [SerializeField, ShowOnly]
    private bool _isSleeping = false;
    
    [SerializeField, ShowOnly]
    private bool _isHyperactive = false;

    [SerializeField, ShowOnly]
    private bool _isOvercaffeinated = false;

    [SerializeField]
    private DeveloperNeeds _developerNeeds;
    
    /// <summary>
    /// Gibt die Grunddaten des Entwicklers zurück.
    /// </summary>
    public DeveloperStats BaseStats => _baseStats;

    /// <summary>
    /// Gibt die Anzahl der Finger zurück.
    /// </summary>
    public int FingersLeft => _fingersLeft;
    
    /// <summary>
    /// Gibt die aktuelle Effizienz des Entwicklers in Prozent zurück.
    /// </summary>
    public double CurrentEfficiency => _currentEfficiency;

    public string Name => _name;

    [Serializable, Flags]
    public enum WantedConsumable
    {
        None,
        Food = 0x01,
        Drink = 0x02,
        Coffee = Drink | 0x04,
        Mate = Drink | 0x08,
        Pizza = Food | 0x10
    }
    
    [SerializeField]
    private GameObject _caffeineNeed;

    [SerializeField] private WantedConsumable _wantedDrink;
    
    [SerializeField]
    private GameObject _hungerNeed;
    
    [SerializeField] private WantedConsumable _wantedFood;
    
    [SerializeField]
    private GameObject _toiletNeed;

    void Start()
    {
        _developerNeeds = gameObject.GetComponent<DeveloperNeeds>();
        
        _fingersLeft = _baseStats.Fingers;
    }

    [ContextMenu("Give Coffee")]
    private void TestCoffee()
    {
        GiveDrink(0.3, WantedConsumable.Coffee);
    }

    [ContextMenu("Give Mate")]
    private void TestMate()
    {
        GiveDrink(0.3, WantedConsumable.Mate);
    }
    
    [ContextMenu("Give Food")]
    private void TestFood()
    {
        GiveFood(0.3, WantedConsumable.Pizza);
    }
    
    [ContextMenu("Drain Bladder")]
    private void TestPee()
    {
        Pee(0.3, true);
    }
    
    public void GiveDrink(double caffeineAmount, WantedConsumable drinkType)
    {
        if (!drinkType.HasFlag(WantedConsumable.Drink))
            throw new ArgumentException(nameof(drinkType),
                $"{nameof(drinkType)} must be a value with the \"{WantedConsumable.Drink}\" flag");
        
        _caffeineLevel = Math.Min(_caffeineLevel + caffeineAmount, 2.0);
        
        if (_caffeineNeed != null && _caffeineLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_caffeineNeed);
            _caffeineNeed = null;
        }

        if (_wantedDrink != WantedConsumable.None)
        {
            // TODO: Wie wäre es damit, das nicht fest zu coden?
            if (drinkType == _wantedDrink)
                _happiness += 0.2;
            else
                _happiness -= 0.2;
        }
        else
        {
            _happiness += 0.2;
        }

        _wantedDrink = WantedConsumable.None;
    }
    
    public void GiveFood(double foodAmount, WantedConsumable foodType)
    {
        if (!foodType.HasFlag(WantedConsumable.Food))
            throw new ArgumentException(nameof(foodType),
                $"{nameof(foodType)} must be a value with the \"{WantedConsumable.Food}\" flag");
        
        _hungerLevel = Math.Min(_hungerLevel + foodAmount, 1.0);
        
        if (_hungerNeed != null && _hungerLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_hungerNeed);
            _hungerNeed = null;
        }
        
        if (_wantedFood != WantedConsumable.None)
        {
            if (foodType == _wantedFood)
                _happiness += 0.2;
            else
                _happiness -= 0.2;
        }
        else
        {
            _happiness += 0.2;
        }

        _wantedFood = WantedConsumable.None;
    }
    
    /// <summary>
    /// Der Entwickler Pinkelt die angegebene Menge aus.
    /// </summary>
    /// <param name="peeAmount">Die Menge die ausgepinkelt wird.</param>
    /// <param name="onToilet">Wenn true, dann pinkelt der Entwickler auf einer Toilette. Wenn false, dann pinkelt er auf den Boden (was schlecht ist)</param>
    public void Pee(double peeAmount, bool onToilet)
    {
        _urgeToUrinateLevel = Math.Min(_urgeToUrinateLevel += peeAmount, 1.0);
        
        if (_toiletNeed != null && _urgeToUrinateLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_toiletNeed);
            _toiletNeed = null;
        }

        if (onToilet)
            _happiness += 0.2;
        else
            _happiness -= 0.2;
    }

    public void UpdateStats(double caffeineDrain, double hungerDrain, double urinationDrain, double happinessDrain)
    {
        _caffeineLevel -= caffeineDrain * _baseStats.CaffeineDrainFactor;
        _hungerLevel -= hungerDrain * _baseStats.HungerDrainFactor;
        _urgeToUrinateLevel -= urinationDrain * _baseStats.UrinationDrainFactor;
        _happiness -= happinessDrain * _baseStats.UrinationDrainFactor;

        _caffeineLevel = Math.Max(_caffeineLevel, 0.0);
        _hungerLevel = Math.Max(_hungerLevel, 0.0);
        _urgeToUrinateLevel = Math.Max(_urgeToUrinateLevel, 0.0);
        _happiness = Math.Max(_happiness, 0.0);
        
        _isHyperactive = _caffeineLevel > 1.0;
        _isOvercaffeinated = _caffeineLevel > 1.5;
        _isSleeping = _caffeineLevel <= 0.0;
        
        if (_caffeineLevel < GameManager.Instance.NeedNotificationThreshold && _caffeineNeed == null)
        {
            // TODO: Wir können hier anhand von Präferenz gewichten.

            if (Random.Range(0.0f, 1.0f) > 0.5f)
            {
                _caffeineNeed = _developerNeeds.SpawnMateNeed();
                _wantedDrink = WantedConsumable.Mate;
            }
            else
            {
                _caffeineNeed = _developerNeeds.SpawnCoffeeNeed();
                _wantedDrink = WantedConsumable.Coffee;
            }
        }

        if (_hungerLevel < GameManager.Instance.NeedNotificationThreshold && _hungerNeed == null)
        {
            _hungerNeed = _developerNeeds.SpawnHungerNeed();
            _wantedFood = WantedConsumable.Pizza;
        }
        
        if (_urgeToUrinateLevel < GameManager.Instance.NeedNotificationThreshold && _toiletNeed == null)
        {
            // TODO: Go to toilet
            
            Debug.Log("Ich muss aufs Klo!");
            
            _toiletNeed = _developerNeeds.SpawnToiletNeed();
        }

        if (_hungerLevel <= 0.0)
        {
            Die();
        }
    }

    private void NeedFullfilled(GameObject needObject)
    {
        Instantiate(GameManager.Instance.NeedFullfilledParticleEffect, needObject.transform.position, needObject.transform.rotation);
        Destroy(needObject);
    }

    public void UpdateEfficiency()
    {
        _currentEfficiency = _baseStats.BaseEfficiency * (_fingersLeft / 10.0) * CalculateCaffeineEfficiency() * CalculateHungerEfficiency() * CalculateUrinationEfficiency() * CalculateHappinessEfficiency();
    }

    // TODO: Es könnte sich als schwierig erweisen, die Effizienz hoch zu halten.
    // Man könnte ggf. die Funktionen so anpassen, dass sie eine ganze Weile 100% Effizienz geben.
    // TODO: Das auch nur ansatzweise zu balancieren wird wiztig 🤯
    
    private double CalculateCaffeineEfficiency()
    {
        if (_isSleeping)
            return 0.0;

        // Die Formel hat schon recht vielversprechendes Verhalten im Bereich > 1
        //if (_isHyperactive)
        //    return 1.0 + (_caffeineLevel - 1.0) * (_caffeineLevel - 1.0);

        if (_isOvercaffeinated)
            return 0.0;
        
        // https://easings.net/#easeOutCubic
        return 1.0 - Math.Pow(1.0 - _caffeineLevel, 3.0);
    }
    
    private double CalculateHungerEfficiency()
    {
        if (_hungerLevel > 1.0)
            return 1.0;
        
        // https://easings.net/#easeOutCirc
        return Math.Sqrt(1.0 - Math.Pow(_hungerLevel - 1.0, 2.0));
    }
    
    private double CalculateUrinationEfficiency()
    {
        if (_urgeToUrinateLevel > 1.0)
            return 1.0;
        
        // https://easings.net/#easeOutExpo
        return Math.Abs(_urgeToUrinateLevel - 1.0) < 0.0001f ? 1.0 : 1.0 - Math.Pow(2, -10 * _urgeToUrinateLevel);
    }
    
    private double CalculateHappinessEfficiency()
    {
        // 50% bei 0 Happiness, 100% bei 0.75 Happiness, 125% bei 1 Happiness 
        return 0.5 + _happiness * 2.0 / 3.0;
    }
    
    /// <summary>
    /// Der Entwickler wird verletzt und der Idiot bricht sich ausgerechnet einen Finger...
    /// </summary>
    public void Hurt()
    {
        _fingersLeft--;

        // Ob er stirbt oder nicht, für uns hat er auf jeden Fall seinen Nutzen verloren.
        if (_fingersLeft == 0)
            Die();
    }

    private void Die()
    {
        Debug.Log($"{Name} ist verreckt.");
    }
}