using System;
using UnityEngine;

namespace Cryville.Common.Unity.Input {
	public class AndroidTouchHandler : InputHandler {
		readonly AndroidTouchListener _listener;
		readonly AndroidJavaClass _systemClock;

		public AndroidTouchHandler() {
			if (Environment.OSVersion.Platform != PlatformID.Unix)
				throw new NotSupportedException("Android touch is not supported on this device");
			_systemClock = new AndroidJavaClass("android.os.SystemClock");
			new AndroidJavaClass("com.unity3d.player.UnityPlayer")
				.GetStatic<AndroidJavaObject>("currentActivity")
				.Get<AndroidJavaObject>("mUnityPlayer")
				.Call("setOnTouchListener", _listener = new AndroidTouchListener(this));
		}

		protected override void Activate() {
			_listener.Activated = true;
		}

		protected override void Deactivate() {
			_listener.Activated = false;
		}

		public override void Dispose(bool disposing) {
			if (disposing) {
				Deactivate();
			}
		}

		public override bool IsNullable(int type) {
			if (type != 0) throw new ArgumentOutOfRangeException("type");
			return true;
		}

		public override byte GetDimension(int type) {
			if (type != 0) throw new ArgumentOutOfRangeException("type");
			return 2;
		}

		public override string GetTypeName(int type) {
			switch (type) {
				case 0: return "Android Touch";
				default: throw new ArgumentOutOfRangeException("type");
			}
		}

		public override double GetCurrentTimestamp() {
			return _systemClock.CallStatic<long>("uptimeMillis") / 1000.0;
		}

		class AndroidTouchListener : AndroidJavaProxy {
			public bool Activated { get; set; }

			readonly AndroidTouchHandler _handler;

			public AndroidTouchListener(AndroidTouchHandler handler) : base("android.view.View$OnTouchListener") {
				_handler = handler;
			}

#pragma warning disable IDE1006
#pragma warning disable IDE0060
			public bool onTouch(AndroidJavaObject v, AndroidJavaObject e) {
				if (!Activated) return false;
				try {
					int pointerCount = e.Call<int>("getPointerCount");
					for (int i = 0; i < pointerCount; i++) {
						int id = e.Call<int>("getPointerId", i);
						double time = e.Call<long>("getEventTime") / 1000.0;
						int action = e.Call<int>("getActionMasked");
						Vector2 pos = UnityCameraUtils.ScreenToWorldPoint(new Vector2(
							e.Call<float>("getX", i),
							e.Call<float>("getY", i)
						));
						_handler.Feed(0, id, new InputVector(time, pos));
						if (action == 1 /*ACTION_UP*/ || action == 3 /*ACTION_CANCEL*/ || (action == 6 /*ACTION_POINTER_UP*/ && e.Call<int>("getActionIndex") == i)) {
							_handler.Feed(0, id, new InputVector(time));
						}
					}
				}
				catch (Exception ex) {
					Logger.Log("main", 4, "Input", "An error occured while handling an Android touch event: {0}", ex);
				}
				return false;
			}
#pragma warning restore IDE0060
#pragma warning restore IDE1006
		}
	}
}