using System.Collections.Generic;
using UnityEngine;

namespace InfinityCode.OnlineMapsExamples
{
    public class TilesetMapTilerOverlayExample3 : MonoBehaviour
    {
        private List<OverlayItem> loadingOverlays;

        private void CheckDownloadComplete()
        {
            bool hasComplete = false;
            foreach (OverlayItem data in loadingOverlays)
            {
                if (data.www.isDone)
                {
                    if (string.IsNullOrEmpty(data.www.error))
                    {
                        Texture2D texture = new Texture2D(256, 256, TextureFormat.ARGB32, false);
                        data.www.LoadImageIntoTexture(texture);
                        data.tile.overlayBackTexture = texture;
                    }
                    data.Dispose();
                    hasComplete = true;
                }
            }

            if (hasComplete) loadingOverlays.RemoveAll(d => d.tile == null);
        }

        private void OnStartDownloadTile(OnlineMapsTile tile)
        {
            loadingOverlays.Add(new OverlayItem(tile));
            OnlineMaps.instance.StartDownloadTile(tile);
        }

        private void Start()
        {
            loadingOverlays = new List<OverlayItem>();
            OnlineMaps.instance.OnStartDownloadTile += OnStartDownloadTile;
        }

        private void Update()
        {
            CheckDownloadComplete();
        }

        internal class OverlayItem
        {
            public OnlineMapsWWW www;
            public OnlineMapsTile tile;

            public OverlayItem(OnlineMapsTile tile)
            {
                this.tile = tile;
                www = OnlineMapsUtils.GetWWW(string.Format("http://tile2.opencyclemap.org/Outdoors/{0}/{1}/{2}.png", tile.zoom, tile.x, tile.y));
            }

            public void Dispose()
            {
                www.Dispose();
                www = null;
                tile = null;
            }
        }
    }
}