using System;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
using JetBrains.Annotations;
using Pools;
using Roads;

//Kreuzungen und Slalom-Referenzpunkte für die Route
[Serializable]
public struct RoutePoint
{
    //Point position
    public string name;
    public float x;
    public float z;
    public bool slalom;
    public int stepsizes;
}

public class CoinCreation : MonoBehaviour
{
    // Parameters to determine stepsize.
    float route_lenght;
    [SerializeField] public int Coin_Number;
    [SerializeField] public float Distance_Cross; // Test for cross coin drawing
    [SerializeField] public float Distance_Slalom;
    //[SerializeField] public bool Draw_Cross; // Maybe draw on Line
    public float stepsize; // public float stepsize = 10; //TODO welcher Wert ist hier passend?
    List<float> differeces = new List<float>();
    public int counter = 0; // How many Coins were drawn on the road

    public CoinPool coinPool;
    public List<RoutePoint> points = new List<RoutePoint>();
    int pointIndex = 0;
    private Vector3 coin_position;
    private GameObject coin;
    RoutePoint start_point;
    RoutePoint end_point;

    private void Start()
    {
        CalcRoute();
        PlaceCoins();
        PlaceCoins();
    }

    int points_size = 30; //needs to be changed if Route changes!

    // Determine route length
    public void CalcRoute()
    {
        route_lenght = 0;

        // Compute the whole route length.
        for (int idx = 0; idx < points.Count - 1; ++idx)
        {
            float diff_x = System.Math.Abs(points[idx].x - points[idx + 1].x);
            float diff_z = System.Math.Abs(points[idx].z - points[idx + 1].z);

            // If we calculate route length in slalom part -> use Pythagoras to
            // calculate Hypothenuse.
            if (points[idx].slalom && points[idx + 1].slalom)
            {
                float pythagoras = (float)System.Math.Sqrt(System.Math.Pow(diff_x, 2) + System.Math.Pow(diff_z, 2));
                route_lenght = route_lenght + pythagoras;
                differeces.Add(pythagoras);
            }
            // Add distance of x-direction or z-direction
            else
            {
                route_lenght = route_lenght + diff_x + diff_z;
                differeces.Add(diff_x + diff_z);
            }
        }
        Debug.Log(differeces.Count);

    }


    // Wird von CoinUpdate aufgerufen, das in jeder Kreuzung der Route enthalten ist
    public void PlaceCoins()
    {
        if ((pointIndex + 1) < points_size) // Check: sind noch mindestens 2 Punkte in der Liste?
        {
            do
            {
                //Abstand zwischen den Coins berechnen (Orientiert an Tills-Code-Beispiel)

                start_point = points[pointIndex];
                start_point.x = start_point.x + 190f; //190 = offset wegen relativen Kreuzungskoordinaten aus Hierachie

                // Compute corresponding stepsize
                //      TODO: Calculate correct coin number, due round of number, for evaluation
                stepsize = (differeces[pointIndex] / route_lenght) * (float)Coin_Number;
                Debug.Log("<color=red>ACTUAL COIN SIZE: " + stepsize.ToString());

                pointIndex++; //Index für nächsten Punkt aus Liste holen

                end_point = points[pointIndex];
                end_point.x = end_point.x + 190f; //190 = offset wegen relativen Kreuzungskoordinaten aus Hierachie

                float distance_x = System.Math.Abs(start_point.x - end_point.x);
                float distance_z = System.Math.Abs(start_point.z - end_point.z);

                float space_x = 0; //default
                float space_z = 0; //default

                Vector3 rotationVector = new Vector3(0f, 0f, 0f);

                int idx = 1;
                bool slalom = false;
                bool slalom_x_dir = true;

                if (distance_x > 0) // wenn entlang der x Richung verteilt wird
                {
                    space_x = distance_x / stepsize;
                    Debug.Log("Coin-Creation: Place Coins along x axis.");
                    rotationVector = new Vector3(0f, 0f, 0f);
                }
                if (distance_z > 0) // wenn entlang der z Richung verteilt wird
                {
                    space_z = distance_z / stepsize;
                    Debug.Log("Coin-Creation: Place Coins along z axis.");
                    rotationVector = new Vector3(0f, 90f, 0f);
                }
                if (start_point.slalom && end_point.slalom)
                {
                    Debug.Log("Coin-Creation: Place Coins for Slalom.");
                    idx = 0;

                    // Check if slalom along x-axis (slalom_x_dir) or along z-axis (!slalom_x_dir)
                    if (!points[pointIndex - 2].slalom)
                    {
                        if (start_point.x - points[pointIndex - 2].x == 0)
                        {
                            slalom_x_dir = false;
                        }
                        else
                        {
                            slalom_x_dir = true;
                        }

                    }
                    else
                    {
                        slalom = true;
                    }

                }

                for (int i = idx; i < System.Math.Round(stepsize); ++i)
                {
                    //Coin-Position berechnen
                    if (!slalom || (slalom && i != 0))
                    {
                        if (start_point.x - end_point.x > 0)
                        {
                            coin_position.x = start_point.x - i * space_x;
                        }
                        if (start_point.x - end_point.x <= 0)
                        {
                            coin_position.x = start_point.x + i * space_x;
                        }
                        if (start_point.z - end_point.z > 0)
                        {
                            coin_position.z = start_point.z - i * space_z;
                        }
                        if (start_point.z - end_point.z <= 0)
                        {
                            coin_position.z = start_point.z + i * space_z;
                        }
                        if (slalom || (start_point.slalom && end_point.slalom))
                        {
                            rotationVector = new Vector3(0f, 0, 0f);
                        }
                    }
                    else
                    {
                        if (slalom_x_dir)
                        {
                            coin_position.x = start_point.x;
                            if (start_point.z - end_point.z > 0)
                            {
                                coin_position.z = start_point.z - Distance_Slalom;
                            }
                            if (start_point.z - end_point.z <= 0)
                            {
                                coin_position.z = start_point.z + Distance_Slalom;
                            }
                            rotationVector = new Vector3(0f, 0f, 0f);
                        }
                        else
                        {
                            if (start_point.x - end_point.x > 0)
                            {
                                coin_position.x = start_point.x - Distance_Slalom;
                            }
                            if (start_point.x - end_point.x <= 0)
                            {
                                coin_position.x = start_point.x + Distance_Slalom;
                            }
                            coin_position.z = start_point.z + Distance_Slalom;
                            rotationVector = new Vector3(0f, 90f, 0f);
                        }
                    }

                    coin_position.y = 0.6f;

                    if ((distance_x - Distance_Cross < System.Math.Abs(coin_position.x - start_point.x) && distance_x != 0 && !end_point.slalom)
                        || (distance_z - Distance_Cross < System.Math.Abs(coin_position.z - start_point.z) && distance_z != 0 && !end_point.slalom))
                    {
                        break;
                    }

                    counter++;

                    //Coin erstellen
                    coin = coinPool.GetItem();
                    coin.transform.position = coin_position;
                    coin.transform.rotation = Quaternion.Euler(rotationVector);
                    if (((i + 1) == stepsize) && (coin != null)) { Debug.Log("CoinCreation: Coin placement finished."); }
                }
                Debug.Log(counter);
            } while (end_point.slalom); //Da diese Funktion nur von Kreuzungen und nicht von Slalom-Referenzpunkten aufgerufen wird
            // muss hier eine Schleife über die einzelnen Slalom-Abschnitte gemacht werden
        }
        else
        {
            Debug.Log("The End of the Route is near, so no new coins needed!");
        }
    }
}