using Kryz.CharacterStats.Examples;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class Health : Resource
{
    protected CharacterStats character;

    public ScrollingText scrollingTextPrefab;
    protected ScrollingText scrollingText;

    protected AbsorbEffectInstance absorbEffectInstance;
    protected DamageIncomeModifierEffectInstance damageIncomeModifierEffectInstance;

    public UnityEvent<float> onMaxHealthChanged = new UnityEvent<float>();
    public UnityEvent onDeath = new UnityEvent();

    private bool noCost = false;
    public bool NoCost => noCost;

    public bool invulnerable = false;
    public bool Invulnerable => invulnerable;

    float incomingValue;
    float percentStatMitigation;
    float reducedDamage;

    private bool isDead;

    public UnityEvent<bool> OnInvulnerabilityStateChanged = new UnityEvent<bool>();
    public UnityEvent OnDodgedSuccessfully = new UnityEvent();

    public void SetIsDeadState(bool isDead)
    {
        this.isDead = isDead;
        canRegen = !isDead;
    }

    protected virtual void Awake()
    {
        character = GetComponent<CharacterStats>();
        absorbEffectInstance = GetComponent<AbsorbEffectInstance>();
        damageIncomeModifierEffectInstance = GetComponent<DamageIncomeModifierEffectInstance>();



        character.onAllStatsUpdated.AddListener(CalculateMaxValueBasedOnStat);
    }

    protected override void Start()
    {
        baseRegenValue = character.GetStat("healthregen").BaseValue;

        baseMaxValue = character.GetStat("maxhealth").BaseValue;

        base.Start();
    }

    public bool EnoughHealth(float cost)
    {
        if (noCost || invulnerable) return true;

        return cost <= currentValue;
    }

    public void SetInvulnerabilityState(bool isInvulnerable)
    {
        invulnerable = isInvulnerable;
        OnInvulnerabilityStateChanged.Invoke(invulnerable);
    }


    protected void HandleDamageIncomeModifierEffects()
    {
        if (incomingValue < 0)
        {

            if (damageIncomeModifierEffectInstance.IsActive)
            {
                //Debug.Log("Incoming damage b4 mitigation: " + incomingValue);

                incomingValue = damageIncomeModifierEffectInstance.ModifyDamageIncome(incomingValue);

                if (incomingValue > 0) //avoid damage ultra mitigated turning into healing
                    incomingValue = 0;
            }
            //Debug.Log("Incoming damage after mitigation: " + incomingValue);
        }
    }

    protected bool HasDodged()
    {
        return MathHelpers.RollChancePercent(character.GetStat("dodgechance").Value);
    }
    protected bool HasBlocked()
    {
        return MathHelpers.RollChancePercent(character.GetStat("blockchance").Value);
    }

    protected void HandleBlockMitigation()
    {
        if (incomingValue >= 0) return;

        Debug.Log("Blocked!");

        if (scrollingTextPrefab != null)
        {
            scrollingText = GameObjectPoolManager.Instance.Get(scrollingTextPrefab.gameObject, this.transform.position + new Vector3(Random.Range(-0.5f, 0.5f), 2f, Random.Range(-0.5f, 0.5f)), Quaternion.identity).GetComponent<ScrollingText>();

            scrollingText.ShowBlock("Blocked!");
        }

        percentStatMitigation = MathHelpers.NormalizePercentageDecimal(character.GetStat("blockeffectiveness").Value);

        percentStatMitigation = Mathf.Clamp(percentStatMitigation, 0, GameConstants.CharacterStatsBalancing.MaximumPercentDamageReductionFromBlock);

        reducedDamage = incomingValue * percentStatMitigation;
        incomingValue += Mathf.Abs(reducedDamage);

        if (incomingValue > 0) //avoid damage ultra mitigated turning into healing
            incomingValue = 0;

    }

    protected void HandleStatMitigation(DamageType dmgType)
    {
        if (incomingValue < 0)
        {
            switch (dmgType)
            {
                case DamageType.Attack:
                default:
                    {
                        percentStatMitigation = Mathf.Clamp((character.GetStat("armor").Value * GameConstants.CharacterStatsBalancing.PercentArmorIntoDamageReduction), 0,GameConstants.CharacterStatsBalancing.MaximumPercentDamageReductionFromArmor);
                    }
                    break;
                case DamageType.Spell:
                    {
                        percentStatMitigation = Mathf.Clamp((character.GetStat("magicresistance").Value * GameConstants.CharacterStatsBalancing.PercentMagicResistanceIntoDamageReduction), 0, GameConstants.CharacterStatsBalancing.MaximumPercentDamageReductionFromMagicResistance);
                    }
                    break;
            }
           

            //Debug.Log(gameObject.name + " mitigating = " + percentStatMitigation + " percent");
            reducedDamage = incomingValue * percentStatMitigation;
            incomingValue += Mathf.Abs(reducedDamage);
            //Debug.Log(gameObject.name + " receiving dmg = " + incomingValue + $" after mitigations from {(dmgType == DamageType.Attack ? nameof(character.Armor) : nameof(character.MagicResistance))}");

            if (incomingValue > 0) //avoid damage ultra mitigated turning into healing
                incomingValue = 0;
        }
    }

    protected void HandleAbsorbEffects()
    {
        if (incomingValue < 0)
        {
            if (absorbEffectInstance.IsActive)
            {
                //Debug.Log("Incoming damage b4 absorbs: " + incomingValue);

                incomingValue = absorbEffectInstance.AbsorbDamage(incomingValue);

                if (incomingValue > 0) //avoid complete absorbs turning into healing
                    incomingValue = 0;
            }
            //Debug.Log("Incoming damage after absorbs: " + incomingValue);
        }
    }

    

    public override void ChangeValue(float value)
    {
        //Debug.Log("Value to change: " + value);

        if (isDead) return;

        incomingValue = value;

        if (invulnerable && incomingValue < 0) return;

        HandleDamageIncomeModifierEffects();

        HandleAbsorbEffects();

        currentValue += incomingValue;

        currentValue = Mathf.Clamp(currentValue, 0, maxValue);
        if (currentValue == 0)
        {
            //dead;
            onDeath.Invoke();
        }
        //Debug.Log("CurrentHealth: " + currentValue);
        onResourceChanged.Invoke(currentValue);
    }

    public void ChangeValueDirect(float value)
    {
        //Debug.Log("Value to change: " + value);

        if (isDead) return;

        incomingValue = value;

        if (invulnerable && incomingValue < 0) return;

        currentValue += incomingValue;

        currentValue = Mathf.Clamp(currentValue, 0, maxValue);
        if (currentValue == 0)
        {
            //dead;
            onDeath.Invoke();
        }
        //Debug.Log("CurrentHealth: " + currentValue);
        onResourceChanged.Invoke(currentValue);
    }

    public void ChangeValue(float value, int dmgType, bool isCrit)
    {
        //Debug.Log("Value to change: " + value);

        if (isDead) return;

        incomingValue = value;

        //Debug.Log(gameObject.name + " receiving dmg = " + incomingValue + " before mitigations " + (DamageType)dmgType);

        if (invulnerable && incomingValue < 0)
        {
            if (scrollingTextPrefab != null)
            {
                scrollingText = GameObjectPoolManager.Instance.Get(scrollingTextPrefab.gameObject, this.transform.position + new Vector3(Random.Range(-0.5f, 0.5f), 2f, Random.Range(-0.5f, 0.5f)), Quaternion.identity).GetComponent<ScrollingText>();

                scrollingText.Show("Invulnerable", Color.gray, 1.5f);
            }
            return;
        }

        if (incomingValue < 0)
        {
            HandleNegativeValue(dmgType, isCrit);
        }
        else
        {
            HandlePositiveValue();
        }
    }

    protected void HandleNegativeValue(int dmgType, bool isCrit)
    {
        if (incomingValue >= 0) return;

        if (HasDodged())
        {
            Debug.Log("Dodged!");

            if (scrollingTextPrefab != null)
            {
                scrollingText = GameObjectPoolManager.Instance.Get(scrollingTextPrefab.gameObject, this.transform.position + new Vector3(Random.Range(-0.5f, 0.5f), 2f, Random.Range(-0.5f, 0.5f)), Quaternion.identity).GetComponent<ScrollingText>();

                scrollingText.ShowDodge("Dodge!");
            }

            OnDodgedSuccessfully.Invoke();
            return;
        }

        HandleDamageIncomeModifierEffects();

        if (HasBlocked())
            HandleBlockMitigation();

        HandleStatMitigation((DamageType)dmgType);

        HandleAbsorbEffects();

        currentValue += incomingValue;

        currentValue = Mathf.Clamp(currentValue, 0, maxValue);

        if (scrollingTextPrefab != null)
        {
            scrollingText = GameObjectPoolManager.Instance.Get(scrollingTextPrefab.gameObject, this.transform.position + new Vector3(Random.Range(-0.5f, 0.5f), 2f, Random.Range(-0.5f, 0.5f)), Quaternion.identity).GetComponent<ScrollingText>();

            if (isCrit)
                scrollingText.ShowCrit(incomingValue.ToString("0.0"));
            else
                scrollingText.ShowHit(incomingValue.ToString("0.0"));

        }

        if (currentValue == 0)
        {
            //dead;
            onDeath.Invoke();
        }
        //Debug.Log("CurrentHealth: " + currentValue);
        onResourceChanged.Invoke(currentValue);
    }

    protected void HandlePositiveValue()
    {
        currentValue += incomingValue;

        currentValue = Mathf.Clamp(currentValue, 0, maxValue);

        if (scrollingTextPrefab != null && incomingValue != 0)
        {
            scrollingText = GameObjectPoolManager.Instance.Get(scrollingTextPrefab.gameObject, this.transform.position + new Vector3(Random.Range(-0.5f, 0.5f), 2f, Random.Range(-0.5f, 0.5f)), Quaternion.identity).GetComponent<ScrollingText>();

            scrollingText.ShowHeal(incomingValue.ToString("0.0"));
        }

        if (currentValue == 0)
        {
            //dead;
            onDeath.Invoke();
        }
        //Debug.Log("CurrentHealth: " + currentValue);
        onResourceChanged.Invoke(currentValue);
    }

    public override float GetMaxValue()
    {
        return base.GetMaxValue();
    }

    public virtual void CalculateMaxValueBasedOnStat()
    {
        maxValue = character.GetStat("maxhealth").Value;

        CalculateRegenValueBasedOnStat();

        onMaxHealthChanged.Invoke(maxValue);
    }
    public void CalculateRegenValueBasedOnStat()
    {
        flatRegen = character.GetStat("healthregen").Value;
    }

    public override void SetMaxValue(float value)
    {
        base.SetMaxValue(value);

        onMaxHealthChanged.Invoke(maxValue);
    }


}