using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;
using ConsoleLSystem;
using System;
using System.Linq;

abstract public class TurtleLSystemEnvironment : TurtleLSystem {

    public Environment environment;
//    private LSystemEvaluator evaluator = null;
//    private float nextStep;
    public sbyte shadowStrength;
    public int lookForLightAngle = 35;
    public float lookForLightLength = 2.0f;
    
    public Matrix4x4 lightDirection(Matrix4x4 transformation, Matrix4x4 resultTransformation, GameObject shape, LSystemNode node)
    {
        int minShadow = 10000;
        Matrix4x4 bestTransformation = transformation;
        int maxShadowTries = 20;
        int shadowRotate = 360/20;
        int shadowStrength_ = 0;
        bool clearShape = false;
        if(shape == null)
        {
            clearShape = true;
            shape = new GameObject("ShadowConeShape");
        }
        GameObject instance;
        Matrix4x4 new_transformation = transformation;
        foreach (GameObject gameObject in GameObject.FindGameObjectsWithTag("ShadowCone")) {
            DestroyImmediate(gameObject);
        }
        Matrix4x4 objectTransformation = (transformation*resultTransformation);
        int nr_shadow_str = 1;
        //---------------------miejsce-na-zadanie-3.4--------------------------------------//

        var strengths = new List<int>();
        for(var x = -lookForLightLength; x < lookForLightLength; x =+ 0.5f)
        {
            for (var y = 0.0f; y < lookForLightLength; y = +0.5f)
            {
                for (var z = -lookForLightLength; z < lookForLightLength; z = +0.5f)
                {
                    var actualPosition = objectTransformation;
                    actualPosition *= Matrix4x4.Translate(new Vector3(x, y, z));
                    var shadowStrenght = (int)environment.shadowStrength(actualPosition.ExtractPosition());
                    strengths.Add(shadowStrenght);
                }
            }
        }

        //---------------------miejsce-na-zadanie-3.4-koniec-------------------------------//
        if (environment.sendShadowToLSystem)
        {
            //---------------------miejsce-na-zadanie-3.5--------------------------------------//
            var avg = strengths.Average();
            node.literal.values[1] = (float)avg;

            //---------------------miejsce-na-zadanie-3.5-koniec------------------------------//
        }
        bestTransformation = transformation*resultTransformation;
        if(environment.rotateTowardsLight)
        {
        minShadow = shadowStrength_;
        if(shadowStrength_/nr_shadow_str > 5.0f)
        {
            shadowConeLimiter ++;
    //        transformation = Matrix4x4.Translate(gameObject.transform.position)*transformation;
            for(int angle = 0;angle <= lookForLightAngle;angle+=10)
            {
                for(int i = 0; i < 360; i += shadowRotate)
                {
                    shadowStrength_ = 0;
                    for(float length = 0.5f; length<lookForLightLength; length+=environment.voxelSize*0.5f)
                    {
                        new_transformation = (transformation*(resultTransformation*Matrix4x4.Rotate(Quaternion.Euler(0, i, 0))*Matrix4x4.Rotate(Quaternion.Euler(0, 0, angle))*Matrix4x4.Translate(new Vector3(0,length,0))));
                        shadowStrength_ += (int)environment.shadowStrength(new_transformation.ExtractPosition()+transformation.MultiplyPoint(shape.transform.position));
//                        if(shadowConeLimiter % 10 == 0)
//                        {
//                        instance = Instantiate(environment.shape);
//                        instance.name = "ShadowCone";
//                        instance.tag = "ShadowCone";
//                        instance.transform.position = new_transformation.ExtractPosition()+transformation.MultiplyPoint(shape.transform.position);
//                        instance.transform.rotation *= transformation.ExtractRotation();
//                        }
                    }
                    if(shadowStrength_ < minShadow)
                    {

                        minShadow = shadowStrength_;
                        bestTransformation = (transformation*(resultTransformation*Matrix4x4.Rotate(Quaternion.Euler(0, i, 0))*Matrix4x4.Rotate(Quaternion.Euler(0, 0, angle))));
                    }
                }
            }
        }
        if(minShadow > 220*lookForLightLength*2.0f)
        {
            bestTransformation = Matrix4x4.Translate(new Vector3(0,0,0));
        }
        }
        if(clearShape)
        {
            DestroyImmediate(shape);
        }
        return bestTransformation;
    }
    public void evaluate() {
        
        base.evaluate();
    }
    public void evaluateAndPresent() {
        evaluate();
        present();
//        Debug.Log(evaluator.lSystemString.ToString().Length);
        //x.name = "aaa";
       
        //Instantiate(x,Matrix4x4.identity);
    }
    public void loadFile() {
//        nextStep = Time.time;
//        clearObjects();
        var sr = new StreamReader(LSystemPath);
        evaluator = LSystemFileParser.parseLSystem(sr);
        sr.Close();
        turtleInterpretation = new Dictionary<string, Func<float[], Tuple<GameObject, Matrix4x4>>>();
        initLiteralInterpretation();
    }
    public void present() {
        clearObjects();
        createModelsRecursiveInEnviroment(evaluator.lSystemString, Matrix4x4.Translate(gameObject.transform.position/2.0f));//Matrix4x4.identity);
    }
    void refreshShadows()
    {
        environment.Reset();
        foreach (GameObject gameObject in GameObject.FindGameObjectsWithTag("LSystemLiteral")) {
           
//            if(!isParentThisGameObject(gameObject))
//            {
                environment.addShadow(gameObject.GetComponent<Transform>().position, shadowStrength);
//            }
//            else
//            {
//                if(isParentThisGameObject(gameObject, 2))
//                {
//                    environment.addShadowPoint(gameObject.GetComponent<Transform>().position, 6);
//                }
//            }
        }
    }
    bool isParentThisGameObject(GameObject gameObject, int depth = 3)
    {
        if(gameObject.transform.parent != null)
        {
            if(gameObject.transform.parent.gameObject == this.gameObject)
            {
                return true;
            }
            else
            {
                if(depth >= 0)
                {
                    return isParentThisGameObject(gameObject.transform.parent.gameObject, depth-1);
                }
            }
        }
        return false;
    }
    int objectCounter = 0;
    int shadowConeLimiter = 0;
    public int childrenCount(LSystemNode node, int depth = 3)
    {
        int c = 0;
        if(node.children.Count > 0)
        {
            c += node.children.Count;
            if(depth > 0)
            {
                foreach(LSystemNode child in node.children)
                {
                    c+= childrenCount(child, depth - 1);
                }
            }
        }
        return c;
    }
    public void createModelsRecursiveInEnviroment(LSystemNode node, Matrix4x4 transformation, int depth = 0)
    {
//        transformation *= Matrix4x4.Translate(gameObject.transform.position);
        while (node != null && objectCounter < 25000) {
            Matrix4x4 new_transformation=transformation;
            Func<float[], Tuple<GameObject, Matrix4x4>> interpretation;
            var name = node.literal.name;
            if (turtleInterpretation.TryGetValue(name, out interpretation) || turtleInterpretation.TryGetValue("*.*", out interpretation)) {
                var result = interpretation(node.literal.values);
                Debug.Log("D: "+node.literal);
                new_transformation = new_transformation*Matrix4x4.Rotate(Quaternion.Euler(UnityEngine.Random.Range(-0.5f, 0.5f), UnityEngine.Random.Range(-0.5f, 0.5f), UnityEngine.Random.Range(-0.5f, 0.5f)));
                new_transformation = lightDirection(new_transformation, result.Item2, result.Item1, node);
                
                if(new_transformation == Matrix4x4.Translate(new Vector3(0,0,0)) && environment.cutBranchesWithMaxShadow)
                {
                    Debug.Log(" children "+node.children.Count);
//                    node.literal.
                    if(childrenCount(node) < 5)
                    {
                        LSystemNode destroyNode = node;
                        if(destroyNode.parent != null)
                        {
                            destroyNode.parent.children.Remove(node);
                            if(destroyNode.parent.mainChild == null)
                            {
                                destroyNode.parent.mainChild = destroyNode.parent.children[0];
                            }
                            node = node.mainChild;
                            destroyNode = null;
        //                    DestroyImmediate(instance);
                            objectCounter--;
                        }
                        continue;
                    }
                }
                if (result.Item1 != null && new_transformation != Matrix4x4.Translate(new Vector3(0,0,0))) {
                    var instance = this.prepeareGameObject(name, result.Item1, new_transformation);
                    environment.addShadow(new_transformation.ExtractPosition()+transformation.MultiplyPoint(result.Item1.transform.position), (sbyte)(shadowStrength/8.0f));
                }

                environment.addShadow(new_transformation.ExtractPosition()+transformation.ExtractPosition(), (sbyte)(shadowStrength/8.0f));
                environment.addShadow((new_transformation*Matrix4x4.Translate(new Vector3(0,1,0))).ExtractPosition()+transformation.ExtractPosition(), (sbyte)(shadowStrength/8.0f));
                //remove scale, rather unnecesary
                new_transformation = new_transformation * Matrix4x4.Scale(result.Item2.ExtractScale()).inverse;
            }
            if(node != null)
            {
                List<ConsoleLSystem.LSystemNode> children_tmp = new List<ConsoleLSystem.LSystemNode>();
                foreach (var child in node.children)
                {
                    children_tmp.Add(child);
                }
                foreach (var child in children_tmp)
                {
                    if(child != null)
                    {
                        createModelsRecursiveInEnviroment(child, new_transformation, depth+1);
                    }
                }
                node = node.mainChild;
            }
            transformation = new_transformation;
        }

    }
        
    private void clearObjects() {
        //var objects = Resources.FindObjectsOfTypeAll<GameObject>().Where(obj => obj.name == "Name");
//        foreach (GameObject gameObject in GameObject.FindGameObjectsWithTag("LSystemLiteral")) {
//            DestroyImmediate(gameObject);
//
//        }
        objectCounter = 0;
        int removed = 1;
        while (removed > 0)
        {
            removed = 0;
            foreach (Transform child in this.gameObject.transform) {
//                environment.addShadow(gameObject.GetComponent<Transform>().position, (sbyte)-shadowStrength);
                if(child.gameObject.tag == "LSystemLiteral")
                {
                    DestroyImmediate(child.gameObject);
                }
                removed ++;
    //            GameObject.Destroy(child.gameObject);
            }
            
        }
        refreshShadows();
//        gameObjects = new List<GameObject>();
    }

}