using System.Collections;
using System.Collections.Generic;
using System.Data;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class WorldUIObserver : MonoBehaviour, IObserver
{
    [SerializeField] private GameObject damageDisplayPrefab;
    [SerializeField] private NotificationType notificationType;

    [SerializeField] private float barSpeed = 0.5f;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        
    }

    private void UpdateHealthBar(int newHealth, Image healthBar)
    {
        // Start coroutine for smooth health bar animation
        StartCoroutine(SmoothHealthBarUpdate(newHealth, healthBar));
    }

    // Coroutine for smooth health bar animation
    private IEnumerator SmoothHealthBarUpdate(int newHealth, Image healthBar)
    {

        Debug.Log("Health Bar Image: " + healthBar.name);

        float targetFillAmount = (float)newHealth / 100;  // Normalize new health value (0 to 1)
        while (Mathf.Abs(healthBar.fillAmount - targetFillAmount) > 0.01f)
        {
            healthBar.fillAmount = Mathf.Lerp(healthBar.fillAmount, targetFillAmount, Time.deltaTime * barSpeed);
            yield return null;
        }

        // Ensure the fill amount is set exactly to the target at the end
        healthBar.fillAmount = targetFillAmount;
    }

    //Notify the observer
    public void OnNotify(ObserverNotification notification)
    {
        //Check if the notification is compatible with the observer
        if (notification.NotificationType == notificationType)
        {
            // Check if the notification contains the NPCController and DamageAmount
            if (notification.ContainsKey("NPCController") && notification.ContainsKey("DamageAmount"))
            {
                //Access the necessary provided data of Observer notification
                NPCController controller = notification.GetData<NPCController>("NPCController");
                int amount = notification.GetData<int>("DamageAmount");

                //Calculate the fill amount
                //float fillAmount = (float)controller.CurrentHealth() / controller.MaxHealth;

                //Checks if the controller has a health bar
                if (controller.HealthBarImage != null)
                {
                    UpdateHealthBar(controller.CurrentHealth(), controller.HealthBarImage);

                    //Display damage when hit
                    Vector2 targetPosition = new Vector2(controller.transform.position.x, controller.transform.position.y);
                    GameObject obj = Instantiate(damageDisplayPrefab, targetPosition, Quaternion.identity, transform);
                    TextMeshProUGUI tmp = obj.GetComponentInChildren<TextMeshProUGUI>();
                    tmp.text = "-" + amount; // Display the damage amount
                    StartCoroutine(DestroyUIObject(obj, 0.7f));
                }
            }
        }
    }

    //Destroy UI GameObjects
    private static IEnumerator DestroyUIObject(GameObject obj, float time)
    {
        while (true)
        {
            yield return new WaitForSeconds(time);
            Destroy(obj);
            break;
        }
    }
}