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

[Serializable]
public struct DeveloperStats
{
    public double BaseEfficiency;
    public int Fingers;
    
    public double CaffeineDrainFactor;
    public double HungerDrainFactor;
    [FormerlySerializedAs("UrgeToUrinateFillFactor")] public double UrinationDrainFactor;

    public DeveloperStats(double baseEfficiency, int fingers, double caffeineDrainFactor, double hungerDrainFactor, double urinationDrainFactor)
    {
        BaseEfficiency = baseEfficiency;
        Fingers = fingers;
        CaffeineDrainFactor = caffeineDrainFactor;
        HungerDrainFactor = hungerDrainFactor;
        UrinationDrainFactor = urinationDrainFactor;
    }
    
    public static readonly DeveloperStats Default = new DeveloperStats(1.0, 10, 1, 1, 1);
}

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, 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;

    [SerializeField]
    private GameObject _caffeineNeed;
    [SerializeField]
    private GameObject _hungerNeed;
    [SerializeField]
    private GameObject _toiletNeed;

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

    [ContextMenu("Give Drink")]
    private void TestDrink()
    {
        GiveDrink(0.25);
    }
    
    [ContextMenu("Give Food")]
    private void TestFood()
    {
        GiveFood(0.25);
    }
    
    [ContextMenu("Drain Bladder")]
    private void TestPee()
    {
        Pee(0.25);
    }
    
    public void GiveDrink(double caffeineAmount)
    {
        _caffeineLevel += caffeineAmount;
        
        if (_caffeineNeed != null && _caffeineLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_caffeineNeed);
        }
    }
    
    public void GiveFood(double foodAmount)
    {
        _hungerLevel += foodAmount;
        
        if (_hungerNeed != null && _hungerLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_hungerNeed);
        }
    }
    
    public void Pee(double peeAmount)
    {
        _urgeToUrinateLevel += peeAmount;
        
        if (_toiletNeed != null && _urgeToUrinateLevel > GameManager.Instance.NeedNotificationThreshold)
        {
            NeedFullfilled(_toiletNeed);
        }
    }

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

        _caffeineLevel = Math.Clamp(_caffeineLevel, 0.0, 2.0);
        _hungerLevel = Math.Clamp(_hungerLevel, 0.0, 1.0);
        _urgeToUrinateLevel = Math.Clamp(_urgeToUrinateLevel, 0.0, 1.0);
        
        _isHyperactive = _caffeineLevel > 1.0;
        _isOvercaffeinated = _caffeineLevel > 1.5;
        _isSleeping = _caffeineLevel <= 0.0;
        
        if (_caffeineLevel < GameManager.Instance.NeedNotificationThreshold && _caffeineNeed == null)
        {
            _caffeineNeed = _developerNeeds.SpawnCaffeineNeed();
        }

        if (_hungerLevel < GameManager.Instance.NeedNotificationThreshold && _hungerNeed == null)
        {
            _hungerNeed = _developerNeeds.SpawnHungerNeed();
        }
        
        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();
    }

    // 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. 
    
    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()
    {
        // https://easings.net/#easeOutCirc
        return Math.Sqrt(1.0 - Math.Pow(_caffeineLevel - 1.0, 2.0));
    }
    
    private double CalculateUrinationEfficiency()
    {
        // https://easings.net/#easeOutExpo
        return Math.Abs(_urgeToUrinateLevel - 1.0) < 0.0001f ? 1.0 : 1.0 - Math.Pow(2, -10 * _urgeToUrinateLevel);
    }
    
    /// <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.");
    }
}