using System.Collections;
using System.Linq;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;

namespace InfinityCode.OnlineMapsExamples
{
    public class GoogleTilesAPI : MonoBehaviour
    {
        public string apiKey;
        public string mapType = "roadmap";
        public string language = "ja-JP";
        public string region = "region";
        public string[] layerTypes = { "layerRoadmap" };
        public bool overlay = false;
        public string scale = "scaleFactor1x";

        private string url = "https://www.googleapis.com/tile/v1/tiles/{zoom}/{x}/{y}?session={sessiontoken}&key={apikey}";
        private string sessiontoken;

        private IEnumerator GetSessionToken()
        {
            OnlineMapsJSONObject jReq = new OnlineMapsJSONObject();
            jReq.Add("mapType", mapType);
            jReq.Add("language", language);
            jReq.Add("region", region);
            jReq.Add("overlay", overlay);
            jReq.Add("scale", scale);
            OnlineMapsJSONArray jLayers = new OnlineMapsJSONArray();
            foreach (string l in layerTypes)
            {
                jLayers.Add(new OnlineMapsJSONValue(l));
            }

            jReq.Add("layerTypes", jLayers);

            UnityWebRequest www = UnityWebRequest.Post("https://www.googleapis.com/tile/v1/createSession?key=" + apiKey, jReq.ToString());
            yield return www.SendWebRequest();

            if (www.result != UnityWebRequest.Result.Success)
            {
                Debug.Log(www.error + "\n" + Encoding.UTF8.GetString(www.downloadHandler.data));
                yield break;
            }

            string response = Encoding.UTF8.GetString(www.downloadHandler.data);
            OnlineMapsJSONItem json = OnlineMapsJSON.Parse(response);
            sessiontoken = json.V<string>("session");

            OnlineMaps.instance.tileManager.tiles.ForEach(t =>
            {
                if (t.status == OnlineMapsTileStatus.error) t.status = OnlineMapsTileStatus.none;
            });

            OnlineMaps.instance.Redraw();
        }

        private string OnReplaceUrlToken(OnlineMapsTile tile, string token)
        {
            if (token == "sessiontoken") return sessiontoken;
            if (token == "apikey") return apiKey;
            return null;
        }

        private void OnStartDownloadTile(OnlineMapsTile tile)
        {
            if (string.IsNullOrEmpty(sessiontoken))
            {
                tile.status = OnlineMapsTileStatus.error;
                return;
            }

            OnlineMapsTileManager.StartDownloadTile(tile);
        }

        private void Start()
        {
            OnlineMapsProvider.GetProviders().FirstOrDefault(p => p.id == "google").AppendTypes(
                new OnlineMapsProvider.MapType("tilesapi") { urlWithLabels = url, }
            );

            OnlineMapsTile.OnReplaceURLToken += OnReplaceUrlToken;
            OnlineMapsTileManager.OnStartDownloadTile += OnStartDownloadTile;

            OnlineMaps.instance.mapType = "google.tilesapi";

            StartCoroutine(GetSessionToken());
        }
    }
}