using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;

public class main : MonoBehaviour
{
    //ground
    float m_groundWidth = 150.0f;
    float m_groundHeight = 120.0f;
    Shader m_groundShader;
    Texture m_groundTexture;
    Color m_groundColor;

    //camera GUI
    float m_FieldOfView = 60.0f;
    float m_camPosX = 0.0f;
    float m_camPosY = 8.0f;
    float m_camPosZ = 10.0f;
    float m_camLookAtX = 0.0f;
    float m_camLookAtY = -15.0f;
    float m_camLookAtZ = 0.0f;

    Vector3 lightDir = new Vector3(10.0f, 10.0f, 10.0f);

    //SceneVariables
    float PlantSpacing = 10.0f;
    float PlantDist = 4.0f;
    float PlantOffset = 20.0f;
    static int rowCount = 8;
    static int colCount = 10;

    //components
    GameObject mainCamera;
    GameObject directionalLight;
    GameObject ground;
    GameObject[,] trees = new GameObject[colCount,rowCount];
    

    void Start()
    {
        //camera
        mainCamera = new GameObject();
        mainCamera.AddComponent<Camera>();
        mainCamera.transform.position = new Vector3(m_camPosX, m_camPosY, m_camPosZ);
        mainCamera.transform.LookAt(new Vector3(m_camLookAtX, m_camLookAtY, m_camLookAtZ), new Vector3(0.0f, 1.0f, 0.0f));
        mainCamera.name = "MainCamera";

        //--------------------------------------------------------------------------------------------------------------------
        
        //directional light
        directionalLight = new GameObject();
        directionalLight.AddComponent<Light>();
        directionalLight.name = "Directional Light";
        directionalLight.GetComponent<Light>().type = LightType.Directional;
        directionalLight.GetComponent<Light>().shadows = LightShadows.Soft;
        directionalLight.GetComponent<Light>().color = Color.white;
        directionalLight.GetComponent<Light>().useColorTemperature = true;
        directionalLight.GetComponent<Light>().colorTemperature = 5900;
        directionalLight.transform.position = new Vector3(10, 10.0f, 10.0f);
        directionalLight.transform.Rotate(lightDir.x, lightDir.y, lightDir.z, Space.Self);

        //---------------------------------------------------------------------------------------------------------------------

        //ground
       
        m_groundColor = new Color(1.0f, 0.4f, 0.6f, 1.0f);
        m_groundShader = Shader.Find("Standard");

        ground = new GameObject("Ground");

        MeshRenderer groundMeshRenderer = ground.AddComponent<MeshRenderer>();
        groundMeshRenderer.material = new Material(m_groundShader);
        groundMeshRenderer.material.color = m_groundColor;
        
        MeshFilter groundMeshFilter = ground.AddComponent<MeshFilter>();

        Mesh groundMesh = new Mesh();
        //ground.transform.Translate(new Vector3(0, 0, -20));

        //dane wierzcho�k�w
        Vector3[] vertices = new Vector3[4]
        {
            new Vector3(-m_groundWidth/2.0f, -1.0f,-m_groundHeight/2.0f ),
            new Vector3(m_groundWidth/2.0f, -1.0f, -m_groundHeight/2.0f),
            new Vector3(m_groundWidth/2.0f,-1.0f, m_groundHeight/2.0f),
            new Vector3(-m_groundWidth/2.0f, -1.0f, m_groundHeight/2.0f),
        };

        //bufor wierzcho�k�w dla groundMesh
        groundMesh.vertices = vertices;
      
        //dane indeks�w dla groundMesh
        int[] indices = new int[6]
        {
            0, 3, 2,
            0, 2, 1
        };

        //bufor indeks�w
        groundMesh.triangles = indices;

        //dane normalnych dla groundMesh
        Vector3[] normals = new Vector3[4]
        {
             new Vector3(0,1,0),
             new Vector3(0,1,0),
             new Vector3(0,1,0),
             new Vector3(0,1,0),
        };

        //bufor normalnych dla groundMesh
        groundMesh.normals = normals;

        //dane wsp�rz�dnych tekstury dla groundMesh
        //Vector2[] uv = new Vector2[4]
        //{
        //    new Vector2(0, 0),
        //    new Vector2(1, 0),
        //    new Vector2(0, 1),
        //    new Vector2(1, 1)
        //};

        //Material mat = Resources.Load("GroundMat") as Material;
        //groundMeshRenderer.material = mat;

        //Inna wersja współrzędnych dla tekstury(small tiles)
        Vector2[] uv = new Vector2[4];
        for (int i = 0; i < uv.Length; i++)
        {
            uv[i] = new Vector2(vertices[i].x, vertices[i].z);
        }

        Material groundMaterial = Resources.Load("GroundMat") as Material;
        groundMaterial.SetTextureScale("_MainTex", new Vector2(0.03f, 0.03f));
        groundMeshRenderer.material = groundMaterial;




        //bufor wsp�rz�dnych tekstury dla groundMesh
        groundMesh.uv = uv;

        for(int i = 0; i < groundMesh.triangles.Length / 3; i++)
        {
            //int rndTriStart = Random.Range(0, groundMesh.triangles.Length/3); //pick a triangle
            Vector2 rndNorm = new Vector2(Random.value, Random.value); //find random point in normalized square
            if (rndNorm.x + rndNorm.y >= 1f)
            {
                rndNorm = new Vector2(1f - rndNorm.x, 1f - rndNorm.y); //cut the square diagonally in half by reflecting points not in the normalized triangle
            }

            Vector3 position = groundMesh.vertices[i] + (rndNorm.x * groundMesh.vertices[i + 1]) + (rndNorm.y * groundMesh.vertices[i + 2]);
            position.y = 0f;
            Vector3 normal = groundMesh.normals[i] + (rndNorm.x * groundMesh.normals[i + 1]) + (rndNorm.y * groundMesh.normals[i + 2]);
            
            GameObject go = GameObject.CreatePrimitive(PrimitiveType.Sphere);
            go.transform.position = position;
            go.transform.rotation = Quaternion.FromToRotation(Vector3.up, normal);
        }


        //Create multiple tree objects based on Width/Length spacing 

       

        for (int i = 0; i < colCount; i++)
        {
            for (int j = 0; j < rowCount; j++)
            {
                trees[i, j] = GameObject.CreatePrimitive(PrimitiveType.Sphere);
                //TODO randomization
                Vector3 position = new Vector3(groundMesh.vertices[2].x - i * PlantSpacing - PlantOffset, 0, groundMesh.vertices[2].z + j * PlantDist - 50);

                trees[i, j].transform.position = position;
            }
        }

        //mesh dla GameObject "Ground"
        groundMeshFilter.mesh = groundMesh;
        //GetComponent<MeshFilter>().mesh = groundMesh;
    }

    void Update()
    {
        mainCamera.GetComponent<Camera>().fieldOfView = m_FieldOfView;
        mainCamera.GetComponent<Camera>().transform.position = new Vector3(m_camPosX,m_camPosY,m_camPosZ);
        mainCamera.transform.LookAt(new Vector3(m_camLookAtX, m_camLookAtY, m_camLookAtZ), new Vector3(0.0f, 1.0f, 0.0f));


        //Update location of objects based on Spacing and Dist variables
        for (int i = 0; i < colCount; i++)
        {
            for (int j = 0; j < rowCount; j++)
            {
                Vector3 position = new Vector3(ground.GetComponent<MeshFilter>().mesh.vertices[2].x - i * PlantSpacing - PlantOffset, 0, ground.GetComponent<MeshFilter>().mesh.vertices[2].z + j * PlantDist - 50);
                trees[i, j].transform.position = position;
                
            }
        }
    }

    void OnGUI()
    {
        GUI.Label(new Rect(10, 20, 60, 20), "FOV");
        m_FieldOfView = GUI.HorizontalSlider(new Rect(70, 20, 150, 20), m_FieldOfView, 20.0f, 150.0f);
        
        GUI.Label(new Rect(10, 45, 60, 20), "camPosX");
        m_camPosX = GUI.HorizontalSlider(new Rect(70, 45, 150, 20), m_camPosX, -30.0f, 30.0f);
        
        GUI.Label(new Rect(10, 70, 60, 20), "camPosY");
        m_camPosY = GUI.HorizontalSlider(new Rect(70, 70, 150, 20), m_camPosY, -30.0f, 30.0f);
        
        GUI.Label(new Rect(10, 95, 60, 20), "camPosZ");
        m_camPosZ = GUI.HorizontalSlider(new Rect(70, 95, 150, 20), m_camPosZ, -30.0f, 50.0f);

        GUI.Label(new Rect(10, 120, 60, 20), "LookAtX");
        m_camLookAtX = GUI.HorizontalSlider(new Rect(70, 120, 150, 20), m_camLookAtX, -30.0f, 30.0f);

        GUI.Label(new Rect(10, 150, 60, 20), "LookAtY");
        m_camLookAtY = GUI.HorizontalSlider(new Rect(70, 145, 150, 20), m_camLookAtY, -30.0f, 30.0f);

        GUI.Label(new Rect(10, 170, 60, 20), "LookAtZ");
        m_camLookAtZ = GUI.HorizontalSlider(new Rect(70, 170, 150, 20), m_camLookAtZ, -30.0f, 30.0f);

        GUI.Label(new Rect(10, 200, 60, 20), "PlantSpacing");
        PlantSpacing = GUI.HorizontalSlider(new Rect(70, 205, 150, 20), PlantSpacing, 3.0f, 15.0f);

        GUI.Label(new Rect(10, 230, 60, 20), "PlantDist");
        PlantDist = GUI.HorizontalSlider(new Rect(70, 240, 150, 20), PlantDist, 1.0f, 20.0f);

        GUI.Label(new Rect(10, 260, 60, 20), "PlantOffset");
        PlantOffset = GUI.HorizontalSlider(new Rect(70, 270, 150, 20), PlantOffset, 10.0f, 60.0f);
    }

}