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

namespace Unity.BossRoom.Gameplay.UI
{
    public class FloatingScore : MonoBehaviour
    {
        [SerializeField] private TextMeshProUGUI scoreChangeText;  // The text component
        [SerializeField] private Image backgroundImage;            // The background image
        [SerializeField] private float animationDuration = 1.5f;   // How long the animation lasts
        [SerializeField] private Vector3 floatOffset = new Vector3(0, 2f, 0); // How far upward to move
        
        private CanvasGroup canvasGroup; // Used for fading

        private void Awake()
        {
            canvasGroup = gameObject.AddComponent<CanvasGroup>(); // Adds a CanvasGroup for fading
        }

        /// <summary>
        /// Initializes the floating score effect.
        /// </summary>
        /// <param name="change">The amount by which the score changed.</param>
        public void Initialize(int change)
        {
            // Set the text to display the score change, adding a '+' for positive changes.
            if (change >= 0)
            {
                scoreChangeText.text = $"+{change}";
                backgroundImage.color = new Color(0.66f, 1f, 0.38f, 1f); // Green for increases
            }
            else
            {
                scoreChangeText.text = $"{change}";
                backgroundImage.color = new Color(1f, 0.4f, 0.38f, 1f); // Red for decreases
            }

            StartCoroutine(Animate());
        }

        /// <summary>
        /// Animates the floating score effect.
        /// </summary>
        private IEnumerator Animate()
        {
            float elapsedTime = 0f;
            Vector3 startPosition = transform.position;
            Vector3 endPosition = startPosition + floatOffset;

            while (elapsedTime < animationDuration)
            {
                float t = elapsedTime / animationDuration;
                transform.position = Vector3.Lerp(startPosition, endPosition, t);
                canvasGroup.alpha = Mathf.Lerp(1f, 0f, t);

                elapsedTime += Time.deltaTime;
                yield return null;
            }

            // Ensure final position and alpha values
            transform.position = endPosition;
            canvasGroup.alpha = 0f;

            Destroy(gameObject); // Destroy the effect once the animation is complete
        }
    }
}