using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Coordinate;
using System.Globalization;
public delegate void MyEventHandler();


public class CtrlCoordinate : MonoBehaviour
{
    // delegate per richiamare un evento, una volta terminato di caricare la lista di punti

    public event MyEventHandler OnEventTriggered;

    string coordinateString = "(8.93266215617905 44.40604327943526, 8.932524131901832 44.40601228591227, 8.932359430658943 44.405996835286025, 8.93207661034279 44.40596474551083)";
    public List<CoordinateStruct> coordinateList = new List<CoordinateStruct>();
    public List<GameObject> PuntiList = new List<GameObject>();
    public List<Texture> cubeTextures = new List<Texture>();
    private static float scale = 10750000f;
    public GameObject referenceObject;

    public GameObject markerPrefab;
    public Transform markerParent;

    OnlineMapsMarkerManager onlineMaps;

    // Start is called before the first frame update
    void Start()
    {
        onlineMaps = GameObject.Find("Map").GetComponent<OnlineMapsMarkerManager>();
        // All of this stuff is used to convert the string to float and serialize the class Coordinate for eac value from the array!
        string modifiedCoordinaateString = coordinateString.Replace("(", "").Replace(")", ""); 
        string[] coordinateArray = modifiedCoordinaateString.Split(new string[] { ", " }, StringSplitOptions.None);
        foreach (string coordinatePair in coordinateArray)
        {
            string[] coordinateValues = coordinatePair.Split(' ');
            decimal decimLongitude = decimal.Parse(coordinateValues[0], CultureInfo.InvariantCulture);
            decimal decimLatitude = decimal.Parse(coordinateValues[1], CultureInfo.InvariantCulture);
            float longitude = (float)decimal.Round(decimLongitude, 6);
            float latitude = (float)decimal.Round(decimLatitude, 6);
            CoordinateStruct coordinate = new CoordinateStruct(latitude, longitude);
            coordinateList.Add(coordinate);
            //Debug.Log(coordinate.latitude);
            
        }
        InstantiatePoints();
    }

    // use this method to instanciate the gameobjects!
    void InstantiatePoints()
    {
        float distanzaTotale=0;
        float distanzaTotaleGeografica = 0;
        for (int i = 0; i < coordinateList.Count; i++)
        {
            CoordinateStruct coordinate = coordinateList[i];
            GameObject pointObject = Instantiate(referenceObject);
            Vector2 coordinateAttuali = new Vector2(coordinate.longitude, coordinate.latitude);
            //Vector3 position = FromLongLat(coordinateAttuali);
            Vector3 position = AlbersProjection(coordinate.longitude, coordinate.latitude);
            pointObject.transform.position = position;
            PuntiList.Add(pointObject);
            if (i > 0)
            {
                float geographicDistance = CalculateGeographicDistance(coordinateList[i], coordinateList[i-1]);
                float distance = Vector3.Distance(PuntiList[i].transform.position, PuntiList[i-1].transform.position);
                Debug.Log($"distanza geografica = {geographicDistance}");
                Debug.Log($"distnza vettori = {distance}");
                distanzaTotale += distance;
                distanzaTotaleGeografica += geographicDistance;
            }
            
        }
        OnEventTriggered.Invoke();
        Debug.Log(distanzaTotale);
        Debug.Log(distanzaTotaleGeografica);
        List<Vector2> line = new List<Vector2>();
            for(int i = 0; i<= coordinateList.Count-1; i++)
        {
            Vector2 vector2 = new Vector2(coordinateList[i].longitude, coordinateList[i].latitude);
            line.Add(vector2);
        }
        OnlineMapsDrawingElementManager.AddItem(new OnlineMapsDrawingLine(line, Color.magenta, 5));
        InstantiateMarkers(coordinateList);

    }

    // creiamo i marker in base alla mia lista di punti 

    public void InstantiateMarkers(List<CoordinateStruct> coordinates)
    {

        foreach (CoordinateStruct coordinate in coordinates)
        {
            //GameObject markerObject = Instantiate(OnlineMapsMarkerManager. markerPrefab, markerParent);;
            OnlineMapsMarkerManager.CreateItem(coordinate.longitude, coordinate.latitude, onlineMaps.defaultTexture);
        }
    }

    public static Vector3 AlbersProjection(float latitude, float longitude)
    {
        // Coordinate di riferimento per Genova
        float centralMeridian = 8.9463f; // Longitudine di riferimento
        float standardParallel1 = 44f; // Primo parallelo standard
        float standardParallel2 = 45f; // Secondo parallelo standard

        // Conversione da gradi a radianti
        float latRad = Mathf.Deg2Rad * latitude;
        float longRad = Mathf.Deg2Rad * longitude;
        float centralMeridianRad = Mathf.Deg2Rad * centralMeridian;
        float stdParallel1Rad = Mathf.Deg2Rad * standardParallel1;
        float stdParallel2Rad = Mathf.Deg2Rad * standardParallel2;

        // Parametri per la proiezione di Albers
        float n = (Mathf.Sin(stdParallel1Rad) + Mathf.Sin(stdParallel2Rad)) / 2f;
        float c = Mathf.Pow(Mathf.Cos(stdParallel1Rad), 2f) + 2f * n * Mathf.Sin(stdParallel1Rad);
        float rho0 = Mathf.Sqrt(c - 2f * n * Mathf.Sin(stdParallel1Rad)) / n;

        // Calcolo della proiezione di Albers
        float rho = Mathf.Sqrt(c - 2f * n * Mathf.Sin(latRad)) / n;
        float theta = n * (longRad - centralMeridianRad);

        float x = scale * (rho * Mathf.Sin(theta));
        float z = scale * (rho0 - rho * Mathf.Cos(theta));

        return new Vector3(ScaleCoordinates(x)/2, 0, ScaleCoordinates(z)/2);
    }
    public static Vector3 GPSToMapCoords(float latitude, float longitude)
    {
        float radius = 6371000f; // raggio della Terra in metri
        float longitude0 = 0f; // longitudine di riferimento

        float latRad = Mathf.Deg2Rad * latitude;
        float longRad = Mathf.Deg2Rad * longitude;

        float x = scale*(radius * (longRad - Mathf.Deg2Rad * longitude0));
        float y = 0;
        float z = scale*(radius * Mathf.Log(Mathf.Tan(Mathf.PI / 4f + latRad / 2f)));

        return new Vector3(ScaleCoordinates(x), y, ScaleCoordinates(z));
    }


    //use this method to reduce the size of the number cause u really dont need all the firs part of the number, and smaller one can readed easily from unity transform!
    public static float ScaleCoordinates(float num)
    {
        // Converti il numero in una stringa
        string numString = num.ToString();

        // Rimuovi le prime quattro cifre decimali
        string scaledString = numString.Substring(2);

        // Converti la stringa risultante in float
        float scaledNum = float.Parse(scaledString);

        // Restituisce il numero con le cifre decimali ridotte
        return scaledNum;
    }

    public static float CalculateGeographicDistance(CoordinateStruct coordinate1, CoordinateStruct coordinate2)
    {
        float earthRadius = 6371000f;

        float lat1Rad = Mathf.Deg2Rad * coordinate1.latitude;
        float lat2Rad = Mathf.Deg2Rad * coordinate2.latitude;
        float lon1Rad = Mathf.Deg2Rad * coordinate1.longitude;
        float lon2Rad = Mathf.Deg2Rad * coordinate2.longitude;

        float deltaLat = lat2Rad - lat1Rad;
        float deltaLon = lon2Rad - lon1Rad;

        float a = Mathf.Sin(deltaLat / 2) * Mathf.Sin(deltaLat / 2) + Mathf.Cos(lat1Rad) * Mathf.Cos(lat2Rad) * Mathf.Sin(deltaLon / 2) * Mathf.Sin(deltaLon / 2);
        float c = 2 * Mathf.Atan2(Mathf.Sqrt(a), Mathf.Sqrt(1 - a));
        float distance = earthRadius * c;

        return distance;
    }

    
}