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


public class main : MonoBehaviour
{
    //ground
    float m_groundWidth = 10.0f;
    float m_groundHeight = 10.0f;
    Shader m_groundShader;
    Texture m_groundTexture;
    Color m_groundColor;

    //camera GUI
    float m_FieldOfView = 60.0f;
    float m_camPosX = 0.0f;
    float m_camPosY = 10.0f;
    float m_camPosZ = 20.0f;
    float m_camLookAtX = 0.0f;
    float m_camLookAtY = 0.0f;
    float m_camLookAtZ = 0.0f;

    float camera_rotation = 1.1f;
    float camera_r = 20f;

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

    //components
    GameObject mainCamera;
    GameObject directionalLight;
    GameObject ground;
    int numOfTrees;
    int numOfRows;

    //prefabs
    public GameObject tree1;
    public GameObject tree2;
    public GameObject tree3;
    public GameObject tree4;
    public GameObject tree5;
    public GameObject tree6;
    public System.Random random = new System.Random();
    public List<GameObject> renderedTrees = new List<GameObject>();

    float treesZSlider = 0.0f;
    float treesXSlider = 0.0f;

    float lightIntensity = 4.0f;
    GameObject selectRandomTree()
    {
        var list = new List<GameObject> { tree1, tree2, tree3, tree4, tree5, tree6 };
        var index = UnityEngine.Random.Range(0, list.Count - 1);
        return list[index];
    }


    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);

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

        //---------------------------------------------------------------------------------------------------------------------
        // create prefabs

        int positionShift_x = 500;
        int positionShift_z = 500;
        int treesNumber = 50;
        int rowsNumber = 10;
        int gridShiftX = 10;
        int gridShiftZ = 10;

        int randomShiftX;
        int randomShiftZ;
        numOfTrees = treesNumber;
        numOfRows = rowsNumber;

        int maxShiftValue = 5;

        for (int i=0; i<treesNumber * gridShiftX; i+=gridShiftX)
        {
            for(int k=0; k<rowsNumber * gridShiftZ; k+=gridShiftZ)
            {
                randomShiftX = random.Next(0, maxShiftValue);
                randomShiftZ = random.Next(0, maxShiftValue);

                renderedTrees.Add(Instantiate(selectRandomTree(), new Vector3(i + positionShift_x + randomShiftX, 1, k + positionShift_z + randomShiftZ), Quaternion.identity));
            }
        }



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

        //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();

         //dane wierzchołków
         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 wierzchołków dla groundMesh
         groundMesh.vertices = vertices;

         //dane indeksów dla groundMesh
         int[] indices = new int[6]
         {
             0, 3, 2,
             0, 2, 1
         };

         //bufor indeksów
         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 współrzędnych tekstury dla groundMesh
         Vector2[] uv = new Vector2[4]
         {
             new Vector2(0, 0),
             new Vector2(1, 0),
             new Vector2(0, 1),
             new Vector2(1, 1)
         };

         //bufor współrzędnych tekstury dla groundMesh
         groundMesh.uv = uv;

         //mesh dla GameObject "Ground"
         groundMeshFilter.mesh = groundMesh;
        **/

    }

    void Update()
    {
        mainCamera.GetComponent<Camera>().fieldOfView = m_FieldOfView;
     //   mainCamera.GetComponent<Camera>().transform.position = new Vector3(m_camPosX,m_camPosY,m_camPosZ);
        mainCamera.GetComponent<Camera>().transform.position = new Vector3(camera_r * Mathf.Cos(camera_rotation) + 500f, 10f, camera_r * Mathf.Sin(camera_rotation) + 500f);
        mainCamera.GetComponent<Camera>().transform.LookAt(new Vector3(500f, 1f, 500f));
        camera_rotation += 0.001f;
        int index = 0;
        
        renderedTrees.ForEach(elem => {
            var currentPosition = elem.transform.position;
            float shiftValueZ = treesZSlider * ((index % numOfRows) - numOfRows/2);
            float shiftValueX = treesXSlider * ( index / numOfRows - numOfTrees/2);
            elem.transform.position = new Vector3(currentPosition.x + shiftValueX, currentPosition.y, currentPosition.z + shiftValueZ);
            index++;
        });


        treesZSlider = 0;
        treesXSlider = 0;
        directionalLight.GetComponent<Light>().intensity = lightIntensity;
    }

    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, 30.0f);

        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, 190, 60, 20), "CameraR");
        camera_r = GUI.HorizontalSlider(new Rect(70, 190, 150, 20), camera_r, -150.0f, 150.0f);

        GUI.Label(new Rect(10, 210, 60, 20), "TreesZSlider");
        treesZSlider = GUI.HorizontalSlider(new Rect(70, 210, 150, 20), treesZSlider, -30.0f, 30.0f);

        GUI.Label(new Rect(10, 230, 60, 20), "TreesXSlider");
        treesXSlider = GUI.HorizontalSlider(new Rect(70, 230, 150, 20), treesXSlider, -30.0f, 30.0f);

        GUI.Label(new Rect(10, 250, 60, 20), "LightSlider");
        lightIntensity = GUI.HorizontalSlider(new Rect(70, 250, 150, 20), lightIntensity, 0.0f, 10.0f);

    }
}