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

public class World : MonoBehaviour
{
    public static World Instance { get; private set; }

    //number of tiles in the game world
    public const int WORLD_SIZE_X = 2000;
    public const int WORLD_SIZE_Y = 2000;

    private WorldObject[] objects;

    private float lastCullTime;
    private const float CULL_TIME = 0.5f;

    private TMP_Text objectInteractMessage;

    void Awake()
    {
        Instance = this;
    }
    // Start is called before the first frame update
    void Start()
    {
        objects = FindObjectsOfType<WorldObject>();
        objectInteractMessage = UIManager.Instance.objectInteractMessage;

        for (int i = 0; i < objects.Length; i++)
        {
            if (objects[i].destroyOnStart)
                objects[i].gameObject.SetActive(false);
        }
        lastCullTime = Time.time;
    }

    // Update is called once per frame
    void LateUpdate()
    {
        //ground items have presidence over object interaction.
        if (GroundItemManager.InteractingWithItem)
        {
            objectInteractMessage.text = "";
            return;
        }

        if (Time.time - lastCullTime > CULL_TIME)
        {
            if (Player.Instance != null)
            {
                bool interactableInRange = false;
                for (int i = 0; i < objects.Length; i++)
                {
                    float distance = Vector3.Distance(objects[i].transform.position, Player.Instance.transform.position);
                    if (distance > Config.RENDER_DISTANCE && !objects[i].largeObject)
                    {
                            objects[i].gameObject.SetActive(false);
                    }
                    else
                    {
                        if (!objects[i].destroyOnStart)
                                objects[i].gameObject.SetActive(true);

                    }

                    if (objects[i].interactiable && !interactableInRange)
                    {
                        if (distance < objects[i].interactDistance)
                        {
                            interactableInRange = true;
                            Player.Instance.interactableWorldObject = objects[i].gameObject;

                            if (objectInteractMessage != null)
                            {
                                objectInteractMessage.text = InputMessageHandler.Instance.Interpolate($"{objects[i].interactMessage}");
                            }
                        }
                        else
                        {
                            Player.Instance.interactableWorldObject = null;
                            if (objectInteractMessage != null)
                            {
                                objectInteractMessage.text = "";
                            }
                        }
                    }
                }
            }
            lastCullTime = Time.time;
        }
    }

    public float getHeight(Vector3 position)
    {
        Terrain terrain = Misc.GetClosestCurrentTerrain(position);
        float height = terrain.SampleHeight(position);

        return height;
    }


}