using System;
using System.Collections;
using System.Collections.Generic;
using Invector.vMelee;
using UnityEngine;
using UnityEngine.UI;

namespace Beyond
{
    public class ConsumablesButtonController : MonoBehaviour
    {
        public bEquipArea equipArea;
        public Image image;
        public GameObject imageParent;
        private int currentIndex = 0;
        private string imagePath = "";
        private bool isLocked = false;
        private float lockDuration = 0.5f;

        [SerializeField]
        private bItemType itemType;
        [SerializeField]
        private ImagePulser imagePulser;
        [SerializeField]
        private bool pulseImage = true;
        //override
        private float pulseSpeed = 10f;

        /// <summary>
        /// to set image properly for disabled
        /// </summary>
        private event Action onEnabled;
        private bool m_currentWeaponGemable = false;
        private bItem m_currentWeapon = null;
        private bItemAttribute m_weaponPowerAttribute;
        private PlayerAttribute faith;

        // Start is called before the first frame update
        private void Awake()
        {
            //SetConsumableButton();
            equipArea.equipSlots.ForEach(slot => slot.onAddItem.AddListener(SetConsumableButton));
            equipArea.equipSlots.ForEach(slot => slot.onRemoveItem.AddListener(SetConsumableButton));
            Player.Instance.ItemManager.onEquipItem.AddListener(OnEquipWeapon);
            Player.Instance.ItemManager.onUnequipItem.AddListener(OnUnequipWeapon);
            //start with 0, end on 2. On consume, equipped recheck binding here
        }

        void Start()
        {
            if (itemType == bItemType.ConsumablesFaith)
            {
                faith = Player.Instance.GetAttribute("Faith");
            }
        }

        //this 2 methods are only for gems - to check if button should be visible for gemable weapon
        private void OnEquipWeapon(bEquipArea area, bItem weapon)
        {
            if (itemType != bItemType.Gemstones || weapon.type == bItemType.Gemstones)
            {
                return;
            }
            //Debug.Log("On Unequiped weapon in area: "+area.name+" weapon: "+weapon.name);
            //if current button type is gemstone, check if button should be active
            m_currentWeapon = area.currentEquippedItem;
            m_weaponPowerAttribute = m_currentWeapon.GetItemAttribute(bItemAttributes.Power);
            m_currentWeaponGemable = m_weaponPowerAttribute !=null;
            SetConsumableButton();

        }

          private void OnUnequipWeapon(bEquipArea area, bItem weapon)
        {
            if (itemType != bItemType.Gemstones || weapon.type == bItemType.Gemstones)
            {
                return;
            }
            //Debug.Log("On Unequiped weapon in area: "+area.name+" weapon: "+weapon.name);
            if (m_currentWeaponGemable && weapon.GetItemAttribute(bItemAttributes.Power) !=null)
            { 
                m_currentWeaponGemable = false;
                m_weaponPowerAttribute = null;
            }
           
        }

        public void EnablePulsing(bool e)
        {
            if (!imagePulser)
                return;
            pulseImage = e;
        }
        
        void Update()
        {
            if (imagePulser == null || !pulseImage)
                return;
            float value;
            imagePulser.speed = pulseSpeed;
            imagePulser.scaleAmount = 1.2f;
            switch (itemType)
            {
                case bItemType.Consumable:
                    value = Player.Instance.CurrentHealth / Player.Instance.MaxHealth;
                    if (value > 0.25)
                        imagePulser.StopPulsing();
                    else
                        imagePulser.StartPulsing();
                    break;
                case bItemType.ConsumablesFaith:
                    value = faith.AttributeCurrentValue / faith.AttributeMaxValue;
                    if (value > 0.25)
                        imagePulser.StopPulsing();
                    else
                        imagePulser.StartPulsing();
                    break;
                case bItemType.Gemstones:
                    if (m_weaponPowerAttribute != null)
                    {
                        if (m_weaponPowerAttribute.value > 1)
                        {
                            imagePulser.StopPulsing();
                        }
                        else
                        {
                            imagePulser.StartPulsing();
                        }
                    }
                break;

            }
        }

        private void OnEnable()
        {
            //because unloaded in menu image needs to be reloaded again
            if (imagePath.Length > 1)
            {
                image.sprite = Resources.Load<Sprite>(imagePath);
            }
            isLocked = false;
        }

        private void OnDestroy()
        {
            if (equipArea)
            {
                equipArea.equipSlots.ForEach(slot => slot.onAddItem.RemoveListener(SetConsumableButton));
                equipArea.equipSlots.ForEach(slot => slot.onRemoveItem.RemoveListener(SetConsumableButton));
                Player.Instance.ItemManager.onEquipItem.RemoveListener(OnEquipWeapon);
                Player.Instance.ItemManager.onEquipItem.RemoveListener(OnUnequipWeapon);
            }
        }

        public void SetConsumableButton(bItem itemDefault = null)
        {
            //    Debug.LogError("setting here");
            bool hasFoundConsumable = false;
            int count = equipArea.equipSlots.Count;
            imagePath = "";
            for (int i = 0; i < count; i++)
            {
                bItem item = equipArea.equipSlots[i].item;

                if (item != null && item.type == itemType)
                {
                    TryToUnloadOldImage();
                    imagePath = item.iconPath;
                    image.sprite = Resources.Load<Sprite>(imagePath);
                    currentIndex = i;
                    i = count;
                    hasFoundConsumable = true;
                }
            }

            if (!hasFoundConsumable)
            {
                imageParent.SetActive(false);
            }

            //if current weapon is geamable, then show button only if button type is gemstone
            else if (itemType == bItemType.Gemstones) 
            {
                imageParent.SetActive(m_currentWeaponGemable);
            }
            else
            {
                imageParent.SetActive(true);
            }

            onEnabled = null;
        }

        private void TryToUnloadOldImage()
        {
            if (image.sprite != null)
            {
                Resources.UnloadAsset(image.sprite);
                //Resources.UnloadUnusedAssets();
            }
        }

        public void ConsumeItem()
        {
            if (isLocked)
            {
                return;
            }
            //short button lock would be nice here
            equipArea.UseItem(equipArea.equipSlots[currentIndex]);
            SetConsumableButton();
            isLocked = true;
            StartCoroutine(UnlockButtonCoroutine());
        }

        private IEnumerator UnlockButtonCoroutine()
        {
            yield return new WaitForSeconds(lockDuration);
            isLocked = false;
        }
    }
}