using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;
using UniRx;

namespace KairoEngine.Utility
{
    public class Utilities
    {

        public const int sortingOrderDefault = 5000;


        // Create Text in the World
        public static TextMesh CreateWorldText(string text, Transform parent = null, Vector3 localPosition = default(Vector3), int fontSize = 40, Color? color = null, TextAnchor textAnchor = TextAnchor.UpperLeft, TextAlignment textAlignment = TextAlignment.Left, int sortingOrder = sortingOrderDefault) {
            if (color == null) color = Color.white;
            return CreateWorldText(parent, text, localPosition, fontSize, (Color)color, textAnchor, textAlignment, sortingOrder);
        }
        
        // Create Text in the World
        public static TextMesh CreateWorldText(Transform parent, string text, Vector3 localPosition, int fontSize, Color color, TextAnchor textAnchor, TextAlignment textAlignment, int sortingOrder) {
            GameObject gameObject = new GameObject("World_Text", typeof(TextMesh));
            Transform transform = gameObject.transform;
            transform.SetParent(parent, false);
            transform.localPosition = localPosition;
            TextMesh textMesh = gameObject.GetComponent<TextMesh>();
            textMesh.anchor = textAnchor;
            textMesh.alignment = textAlignment;
            textMesh.text = text;
            textMesh.fontSize = fontSize;
            textMesh.color = color;
            textMesh.GetComponent<MeshRenderer>().sortingOrder = sortingOrder;
            return textMesh;
        }

        // Get Mouse Position in World with Z = 0f
        public static Vector3 GetMouseWorldPosition() {
            Vector3 vec = GetMouseWorldPositionWithZ(Input.mousePosition, Camera.main);
            vec.z = 0f;
            return vec;
        }
        public static Vector3 GetMouseWorldPositionWithZ() {
            return GetMouseWorldPositionWithZ(Input.mousePosition, Camera.main);
        }
        public static Vector3 GetMouseWorldPositionWithZ(Camera worldCamera) {
            return GetMouseWorldPositionWithZ(Input.mousePosition, worldCamera);
        }
        public static Vector3 GetMouseWorldPositionWithZ(Vector3 screenPosition, Camera worldCamera) {
            Vector3 worldPosition = worldCamera.ScreenToWorldPoint(screenPosition);
            return worldPosition;
        }

        public static Vector3 GetMouseWorldPosition(int mouseColliderLayerMask)
        {
            if(Camera.main == null) return new Vector3();
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if(Physics.Raycast(ray, out RaycastHit raycastHit, 999f, mouseColliderLayerMask))
            {
                return raycastHit.point;
            }
            else return Vector3.zero;
        }

        public static Vector3 GetMouseWorldPosition(int mouseColliderLayerMask, ref bool pointerHit)
        {
            if(Camera.main == null) return new Vector3();
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if(Physics.Raycast(ray, out RaycastHit raycastHit, 999f, mouseColliderLayerMask))
            {
                pointerHit = true;
                return raycastHit.point;
            }
            else
            {
                pointerHit = false;
                return Vector3.zero;
            } 
        }

        // Create a Text Popup in the World, no parent
        public static void CreateWorldTextPopup(string text, Vector3 localPosition) {
            CreateWorldTextPopup(null, text, localPosition, 40, Color.white, localPosition + new Vector3(0, 20), 1f, true);
        }
        
        // Create a Text Popup in the World
        public static void CreateWorldTextPopup(Transform parent, string text, Vector3 localPosition, int fontSize, Color color, Vector3 finalPopupPosition, float popupTime, bool centered) {
            TextMesh textMesh = CreateWorldText(parent, text, localPosition, fontSize, color, TextAnchor.LowerLeft, TextAlignment.Left, sortingOrderDefault);
            if(centered) textMesh.anchor = TextAnchor.MiddleCenter;
            Transform transform = textMesh.transform;
            Vector3 moveAmount = (finalPopupPosition - localPosition) / popupTime;
            CompositeDisposable disposables = new CompositeDisposable();
            Observable.EveryUpdate().Subscribe(_ => {
                transform.position += moveAmount * Time.deltaTime;
                popupTime -= Time.deltaTime;
                if (popupTime <= 0f) {
                    UnityEngine.Object.Destroy(transform.gameObject);
                    disposables.Clear();
                } 
            }).AddTo(disposables);
        }

        public static float GetAngleFromVectorFloat(Vector3 dir) {
            dir = dir.normalized;
            float n = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
            if (n < 0) n += 360;

            return n;
        }

        public static Vector3 ApplyRotationToVector(Vector3 vec, Vector3 vecRotation) {
            return ApplyRotationToVector(vec, GetAngleFromVectorFloat(vecRotation));
        }

        public static Vector3 ApplyRotationToVector(Vector3 vec, float angle) {
            return Quaternion.Euler(0,0,angle) * vec;
        }
    }
}