using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.U2D;

public class LevelGenerator : MonoBehaviour
{
    public static LevelGenerator instance { get; private set; }
    public SpriteShapeController spriteShapeController;
    public int LevelCount = 1000;
    public float groundLevel = -5.5f;
    public float maxHeight = 5;
    public Vector2 minDiff, maxDiff;
    public Vector3[] points {get; private set;}


    public GameObject flagPrefab;
    public GameObject treePrefab;


    public int GoalDistance= 10;
    void Start()
    {
        spriteShapeController.spline.Clear();

        points = new Vector3[LevelCount+1];
        for(int i=0; i < LevelCount; i++){
            if(i ==0){
                points[i] = new Vector3(0,groundLevel);
                spriteShapeController.spline.InsertPointAt(i, points[i]);
                continue;
            }

            Vector3 addition = new Vector3(Random.Range(minDiff.x, maxDiff.x), Random.Range(minDiff.y, maxDiff.y));
            float newX = points[i-1].x + addition.x;
            float newY = points[i-1].y + addition.y;
            while(newY < groundLevel+2){
                newY += Mathf.Abs(addition.y);
            }
            while(newY > maxHeight){
                newY -= Mathf.Abs(addition.y);
            }
            points[i] = new Vector3(newX, newY);
            // spriteShapeController.spline.InsertPointAt(i, points[i]);
            InsertNewPoint(points[i]);

            
            if(Random.Range(0f,1f) > 0.5f){
                Vector2 newTreePosition = points[i];

                Vector3 diff = points[i]-points[i-1];
                Vector2 newTreePosition2 = points[i-1] + (diff/2f);
                Debug.Log($"{points[i-1]} + {points[i]} - {points[i-1]} / 0.5f | diff = {diff}");
                GameObject newTree = Instantiate(treePrefab, newTreePosition2, Quaternion.identity);
                newTree.transform.localScale = Vector3.one * Random.Range(0.75f, 1.1f);
            }
            

            if(i % GoalDistance == 0){
                InsertNewPoint(points[i] + new Vector3(0, -1f));
                InsertNewPoint(points[i] + new Vector3(1f, -1f));
                InsertNewPoint(points[i] + new Vector3(1f, 0f));

                Instantiate(flagPrefab, points[i], Quaternion.identity);
            }

        }

        points[LevelCount] = new Vector3(points[LevelCount-1].x, groundLevel);
        InsertNewPoint( points[LevelCount]);



    }


    void InsertNewPoint(Vector3 point){
        int index= spriteShapeController.spline.GetPointCount();
        spriteShapeController.spline.InsertPointAt(index, point);
        spriteShapeController.spline.SetLeftTangent(index, Vector3.zero);
        spriteShapeController.spline.SetTangentMode(index, ShapeTangentMode.Broken);
    }


    void Update()
    {
        
    }
}