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

#pragma warning disable IDE0090 // Use 'new(...)'
public class Main : MonoBehaviour
{
    #region Constants
    string capturedFramesPath;
    #endregion

    #region Camera GUI fields
    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 m_CameraR = 20f;

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

    #region Object fields
    GameObject mainCamera;
    GameObject directionalLight;
    GameObject ground;
    int numOfTrees;
    int numOfRows;
    #endregion

    #region Ground fields
    readonly float m_groundWidth = 200f;
    readonly float m_groundHeight = 200f;
    Shader m_groundShader;
    public Texture m_groundTexture;
    #endregion

    #region Tree fields
    public GameObject tree1;
    public GameObject tree2;
    public GameObject tree3;
    public System.Random random = new System.Random();
    public List<GameObject> renderedTrees = new List<GameObject>();

    float m_TreesZShift = 0.0f;
    float m_TreesXShift = 0.0f;
    #endregion

    #region Helper fields
    float m_LightIntensity = 1.0f;

    Vector2Int textureCameraSize = new Vector2Int(800, 600);
    GameObject textureCamera;
    readonly int ScreenshotsPerSecond = 1;
    int FrameCounter = 0;

    bool m_capturingFrames = false;
    #endregion

    #region Unity methods
    [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "Unity method")]
    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";

        textureCamera = new GameObject();
        textureCamera.AddComponent<Camera>();
        textureCamera.transform.position = new Vector3(m_camPosX, m_camPosY, m_camPosZ);
        textureCamera.transform.LookAt(new Vector3(m_camLookAtX, m_camLookAtY, m_camLookAtZ), new Vector3(0.0f, 1.0f, 0.0f));
        textureCamera.name = "TextureCamera";

        RenderTexture renderTexture = new RenderTexture(textureCameraSize.x, textureCameraSize.y, 24);
        textureCamera.GetComponent<Camera>().targetTexture = renderTexture;

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

        //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 = 20;
        int rowsNumber = 15;
        int gridShiftX = 5;
        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)
            {
                Vector3 rotationVector = new Vector3(0, Random.Range(0.0f, 360.0f), 0);
                randomShiftX = random.Next(0, maxShiftValue);
                randomShiftZ = random.Next(0, maxShiftValue);
                GameObject tree = SelectRandomTree();

                renderedTrees.Add(Instantiate(tree, new Vector3(i + positionShift_x + randomShiftX, 0, k + positionShift_z + randomShiftZ), Quaternion.Euler(rotationVector)));
                
            }
        }

        capturedFramesPath = Path.Combine(Application.dataPath, "..", "..", "Trees", tree1.name);

        if (!Directory.Exists(capturedFramesPath))
        {
            Directory.CreateDirectory(capturedFramesPath);
        }
        //---------------------------------------------------------------------------------------------------------------------

        //ground

        m_groundShader = Shader.Find("Standard");
        m_groundTexture.wrapMode = TextureWrapMode.Mirror;
        ground = new GameObject("Ground");

        MeshRenderer groundMeshRenderer = ground.AddComponent<MeshRenderer>();
        groundMeshRenderer.material = new Material(m_groundShader)
        {
            mainTexture = m_groundTexture
        };
        groundMeshRenderer.material.SetTextureScale("_MainTex", new Vector2(m_groundWidth, m_groundHeight));


        MeshFilter groundMeshFilter = ground.AddComponent<MeshFilter>();

        Mesh groundMesh = new Mesh();

        Vector3[] vertices = new Vector3[4]
        {
            new Vector3(m_groundWidth/20, 0.0f,m_groundHeight/20),
            new Vector3(m_groundWidth/20+1500, 0.0f, m_groundHeight/20),
            new Vector3(m_groundWidth/20+1500, .0f, m_groundHeight/20+1500),
            new Vector3(m_groundWidth/20, 0.0f, m_groundHeight/20+1500),
        };

        groundMesh.vertices = vertices;

        int[] indices = new int[6]
        {
            0, 3, 2,
            0, 2, 1
        };

        groundMesh.triangles = indices;

        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),
        };

        groundMesh.normals = normals;

        Vector2[] uv = new Vector2[4]
        {
            new Vector2(0, 0),
            new Vector2(1, 0),
            new Vector2(0, 1),
            new Vector2(1, 1)
        };

        groundMesh.uv = uv;

        groundMeshFilter.mesh = groundMesh;
    }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "Unity method")]
    void Update()
    {
        newCameraPosX = m_CameraR * Mathf.Cos(camera_rotation) + 500f + m_camPosX;
        newCameraPosY = 10f + m_camPosY;
        newCameraPosZ = m_CameraR * Mathf.Sin(camera_rotation) + 500f + m_camPosZ;
        Vector3 pos = new Vector3(newCameraPosX, newCameraPosY, newCameraPosZ);
        Vector3 lookAt = new Vector3(500f + m_camLookAtX, 1f + m_camLookAtY, 500f + m_camLookAtZ);

        mainCamera.GetComponent<Camera>().fieldOfView = m_FieldOfView;
        mainCamera.GetComponent<Camera>().transform.position = pos;
        mainCamera.GetComponent<Camera>().transform.LookAt(lookAt);
        camera_rotation += 0.001f;

        if (m_TreesXShift != 0.0f || m_TreesZShift != 0.0f)
        {
            for (int i = 0; i < renderedTrees.Count; i++)
            {
                Vector3 currentPosition = renderedTrees[i].transform.position;
                float shiftValueZ = m_TreesZShift * ((i % numOfRows) - numOfRows / 2);
                float shiftValueX = m_TreesXShift * (i / numOfRows - numOfTrees / 2);
                renderedTrees[i].transform.position = new Vector3(currentPosition.x + shiftValueX, currentPosition.y, currentPosition.z + shiftValueZ);
            }
            m_TreesXShift = 0.0f;
            m_TreesZShift = 0.0f;
        }

        directionalLight.GetComponent<Light>().intensity = m_LightIntensity;

        textureCamera.GetComponent<Camera>().fieldOfView = m_FieldOfView;
        textureCamera.GetComponent<Camera>().transform.position = pos;
        textureCamera.GetComponent<Camera>().transform.LookAt(lookAt);
        //textureCamera.transform.RotateAround(new Vector3(0.0f, 0.0f, 0.0f), new Vector3(0.0f, 1.0f, 0.0f), 1);
    }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "Unity method")]
    void OnGUI()
    {
        int buttonHeight = 30;
        int labelHeight = 20;
        int spacing = 10;
        int y = 20;

        GUIStyle labelStyle = new GUIStyle()
        {
            normal = new GUIStyleState() { textColor = Color.red, background = Texture2D.blackTexture },
        };

        GUI.Label(new Rect(10, y, 100, labelHeight), "Field of View", labelStyle);
        m_FieldOfView = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_FieldOfView, 20.0f, 150.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Camera position X", labelStyle);
        m_camPosX = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camPosX, -300.0f, 300.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Camera position Y", labelStyle);
        m_camPosY = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camPosY, -30.0f, 100.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Camera position Z", labelStyle);
        m_camPosZ = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camPosZ, -300.0f, 300.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Look At X", labelStyle);
        m_camLookAtX = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camLookAtX, -300.0f, 300.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Look At Y", labelStyle);
        m_camLookAtY = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camLookAtY, -300.0f, 300.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Look At Z", labelStyle);
        m_camLookAtZ = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_camLookAtZ, -300.0f, 300.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Camera rotation", labelStyle);
        m_CameraR = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_CameraR, -150.0f, 150.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Light intensity", labelStyle);
        m_LightIntensity = GUI.HorizontalSlider(new Rect(120, y, 150, labelHeight), m_LightIntensity, 0.0f, 5.0f);
        y += labelHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Trees spacing X", labelStyle);
        y += labelHeight + spacing;
        if (GUI.Button(new Rect(10, y, 95, buttonHeight), "+"))
        {
            m_TreesXShift = 1.0f;
        }
        if (GUI.Button(new Rect(115, y, 95, buttonHeight), "-"))
        {
            m_TreesXShift = -1.0f;
        }
        y += buttonHeight + spacing;

        GUI.Label(new Rect(10, y, 100, labelHeight), "Trees spacing Z", labelStyle);
        y += labelHeight + spacing;
        if (GUI.Button(new Rect(10, y, 95, buttonHeight), "+"))
        {
            m_TreesZShift = 1.0f;
        }
        if (GUI.Button(new Rect(115, y, 95, buttonHeight), "-"))
        {
            m_TreesZShift = -1.0f;
        }
        y += buttonHeight + spacing;

        if (GUI.Button(new Rect(10, y, 200, buttonHeight), m_capturingFrames ? "Stop capturing frames" : "Start capturing frames"))
        {
            m_capturingFrames = !m_capturingFrames;
            if (m_capturingFrames)
            {
                StartCoroutine("CaptureAndSaveFrames");
            }
            else
            {
                StopCoroutine("CaptureAndSaveFrames");
            }
        }

    }
    #endregion

    #region On click behaviours
    [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "Method accessed by name")]
    IEnumerator CaptureAndSaveFrames()
    {
        while (true)
        {
            yield return new WaitForEndOfFrame();

            RenderTexture currentRT = RenderTexture.active;

            RenderTexture.active = textureCamera.GetComponent<Camera>().targetTexture;

            textureCamera.GetComponent<Camera>().Render();

            Texture2D offscreenTexture = new Texture2D(textureCamera.GetComponent<Camera>().targetTexture.width, textureCamera.GetComponent<Camera>().targetTexture.height, TextureFormat.RGB24, false);

            offscreenTexture.ReadPixels(new Rect(0, 0, textureCamera.GetComponent<Camera>().targetTexture.width, textureCamera.GetComponent<Camera>().targetTexture.height), 0, 0, false);
            offscreenTexture.Apply();

            RenderTexture.active = currentRT;
            ++FrameCounter;

            string path = Path.Combine(capturedFramesPath, FrameCounter.ToString() + ".png");
            byte[] bytes = offscreenTexture.EncodeToPNG();
            File.WriteAllBytes(path, bytes);
            Debug.Log(path);

            UnityEngine.Object.Destroy(offscreenTexture);

            yield return new WaitForSeconds(1.0f / ScreenshotsPerSecond);
        }
    }
    #endregion

    #region Helpers
    GameObject SelectRandomTree()
    {
        List<GameObject> list = new List<GameObject> { tree1, tree2, tree3 };
        // parszywy kod ale nie mam teraz weny
        int rnd = UnityEngine.Random.Range(0, 11);
        if (rnd == 10)
        {
            return list[2];
        }
        if (rnd == 9)
        {
            return list[1];
        }
        else
        {
            return list[0];
        }
    }
    #endregion
}
#pragma warning restore IDE0090 // Use 'new(...)'