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

public class Health : Resource
{
    protected CharacterStats character;
    protected EntityEventBroker broker;

    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;

    protected 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()
    {
        broker = GetComponent<EntityEventBroker>();
        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 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 void ApplyDamage(DamageArgs args)
    {
        if (isDead) return;

        broker.OnIncomingDamage.Invoke(args);

        UpdateValue(args.currentValue);

        CheckForDeath(args);

        broker.OnIncomingDamageProcessed.Invoke(args);
    }
    public void ApplyHeal(HealArgs args)
    {
        if (isDead) return;

        broker.OnIncomingHeal.Invoke(args);

        UpdateValue(args.currentValue);

        broker.OnIncomingHealProcessed.Invoke(args);
    }

    private void UpdateValue(float incomingValue)
    {
        currentValue += incomingValue;

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

        //Debug.Log("CurrentHealth: " + currentValue);
        onResourceChanged.Invoke(currentValue);
    }
    private void CheckForDeath(DamageArgs args)
    {
        if (currentValue == 0)
        {
            //dead;
            isDead = true;
            args.targetDead = true;
            onDeath.Invoke();
        }
    }

    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)
        {
            return;
        }

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

    protected void HandleNegativeValue(int dmgType, bool isCrit)
    {
        if (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);
    }

    protected void HandlePositiveValue()
    {
        currentValue += incomingValue;

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


        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);
    }


}