using System;
using System.Collections;
using UnityEngine;

namespace InterfaceOff
{
    public abstract class WindowBase : MonoBehaviour
    {
        private WindowSpawner Creator;
        public WindowInteractions Interactions { get; set; }
        public WindowComponents Components { get; set; }

        protected Vector2 Velocity;
        
        public void InstantiateWindowBase(WindowSpawner creator)
        {
            transform.position = CanvasManager.GetRandomPositionOnCanvas();
            Creator = creator;
            
            OnWindowInstantiation();
        }

        protected void LateUpdate()
        {
            /* Moves the component and calculates new position and half size(s) */
            Components.RectTransform.anchoredPosition += Velocity * Time.deltaTime;
            Vector2 position = Components.RectTransform.anchoredPosition;
            
            Vector2 hCanvasSize = CanvasManager.Instance.CanvasRect.sizeDelta * 0.5f;
            Vector2 hSize = Components.RectTransform.sizeDelta * 0.5f;
            
            /* Calculates outcome of a horizontal bounce (if there is one) */
            if (position.x + hSize.x > hCanvasSize.x || position.x - hSize.x < -hCanvasSize.x)
            {
                Velocity.x *= -1f; // Inverts X velocity
                position.x = Math.Clamp
                (
                    position.x,
                    0 - hCanvasSize.x + hSize.x,
                    0 + hCanvasSize.x - hSize.x
                );
            }
            
            /* Calculates outcome of vertical bounce (if there is one) */
            if (position.y + hSize.y > hCanvasSize.y || position.y - hSize.y < -hCanvasSize.y)
            {
                Velocity.y *= -1f; // Inverts Y velocity
                position.y = Math.Clamp
                (
                    position.y,
                    0 - hCanvasSize.y + hSize.y,
                    0 + hCanvasSize.y - hSize.y
                );
            }
            
            Components.RectTransform.anchoredPosition = position; // Updates position if it is supposed to change
        }

        protected virtual void OnWindowInstantiation() { }
        
        /* Default close button closes the window */
        public virtual void OnWindowCloseButtonClicked() => DestroyWindow();

        public void DestroyWindow()
        {
            StartCoroutine(routine: DeathSequence());
            Creator.AlertOfDespawnedWindow();
        }

        private IEnumerator DeathSequence()
        {
            float duration = 0f;
            while (duration < 1f)
            {
                duration += Time.deltaTime;
                float scale = 1f - duration;
                
                transform.localScale = new Vector3(scale, scale, 1f);

                yield return null;
            }
            
            Destroy(gameObject);
        }
    }
}