using System;
using InfinityCode.OnlineMapsDemos;
using UnityEngine;

public class SmoothFlyZoom : MonoBehaviour
{
    public Aircraft aircraft;

    private float altitude = float.MinValue;
    private OnlineMapsTileSetControl control;
    private OnlineMaps map;
    private Vector3 originalPosition;
    private Vector2 originalSize;

    private void Start()
    {
        map = OnlineMaps.instance;
        control = OnlineMapsTileSetControl.instance;
        originalPosition = map.transform.position;
        originalSize = map.tilesetSize;

        Update();
    }

	private void Update ()
    {
	    if (Math.Abs(altitude - aircraft.altitude) < float.Epsilon) return;
        altitude = aircraft.altitude;

        if (altitude < 10) altitude = 10;

        double tlx, tly, brx, bry, dx, dy;
        map.GetCorners(out tlx, out tly, out brx, out bry);
        OnlineMapsUtils.DistanceBetweenPoints(tlx, tly, brx, bry, out dx, out dy);

        double posY = altitude * control.GetBestElevationYScale(tlx, tly, brx, bry) * control.elevationScale;
        if (posY < 100) map.zoom++;
        else if (posY > 400) map.zoom--;

        double s = 1 << (OnlineMaps.MAXZOOM - map.zoom);
        s /= 64;

        dx /= s;
        dy /= s;

        map.tilesetSize = new Vector2((float)dx * 100, (float)dy * 100);
        Vector2 sizeOffset = map.tilesetSize - originalSize;

        Vector3 position = originalPosition + new Vector3(sizeOffset.x / 2, 0, sizeOffset.y / -2);
        if (float.IsInfinity(position.x) || float.IsInfinity(position.z)) return;
        map.transform.position = position;
    }
}