using System.Collections.Generic;
using UnityEngine;

public class main : MonoBehaviour
{
    //camera GUI
    float m_FieldOfView = 60.0f;
    float m_camPosX = 0.0f;
    float m_camPosY = 0.0f;
    float m_camPosZ = 0.0f;
    float m_camLookAtX = 0.0f;
    float m_camLookAtY = 0.0f;
    float m_camLookAtZ = 0.0f;

    float newCameraPosX = 0.0f;
    float newCameraPosY = 0.0f;
    float newCameraPosZ = 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;
    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 = 2.0f;
    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));
            }
        }


    }

    void Update()
    {
        mainCamera.GetComponent<Camera>().fieldOfView = m_FieldOfView;
        newCameraPosX = camera_r * Mathf.Cos(camera_rotation) + 500f + m_camPosX;
        newCameraPosY = 10f + m_camPosY;
        newCameraPosZ = camera_r * Mathf.Sin(camera_rotation) + 500f + m_camPosZ;
        mainCamera.GetComponent<Camera>().transform.position = new Vector3(newCameraPosX, newCameraPosY, newCameraPosZ);
        mainCamera.GetComponent<Camera>().transform.LookAt(new Vector3(500f + m_camLookAtX, 1f + m_camLookAtY, 500f + m_camLookAtZ));
        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, -300.0f, 300.0f);
        
        GUI.Label(new Rect(10, 70, 60, 20), "camPosY");
        m_camPosY = GUI.HorizontalSlider(new Rect(70, 70, 150, 20), m_camPosY, -300.0f, 300.0f);
        
        GUI.Label(new Rect(10, 95, 60, 20), "camPosZ");
        m_camPosZ = GUI.HorizontalSlider(new Rect(70, 95, 150, 20), m_camPosZ, -300.0f, 300.0f);

        GUI.Label(new Rect(10, 120, 60, 20), "LookAtX");
        m_camLookAtX = GUI.HorizontalSlider(new Rect(70, 120, 150, 20), m_camLookAtX, -300.0f, 300.0f);

        GUI.Label(new Rect(10, 150, 60, 20), "LookAtY");
        m_camLookAtY = GUI.HorizontalSlider(new Rect(70, 145, 150, 20), m_camLookAtY, -300.0f, 300.0f);

        GUI.Label(new Rect(10, 170, 60, 20), "LookAtZ");
        m_camLookAtZ = GUI.HorizontalSlider(new Rect(70, 170, 150, 20), m_camLookAtZ, -300.0f, 300.0f);

        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);

    }
}