namespace Mapbox.Editor
{
	using UnityEngine;
	using UnityEditor;
	using System;
	using System.Collections.Generic;
	using Mapbox.Geocoding;
	using Mapbox.Unity;
	using System.Globalization;
	using Mapbox.Unity.Map;
	using Mapbox.Editor;

	public class GeocodeAttributeSearchWindow : EditorWindow
	{
		SerializedProperty _coordinateProperty;
		object _objectToUpdate;

		private bool _updateAbstractMap;

		string _searchInput = "";

		ForwardGeocodeResource _resource;

		List<Feature> _features;

		System.Action<string> _callback;

		const string searchFieldName = "searchField";
		const float width = 320f;
		const float height = 300f;

		bool _isSearching = false;

		void OnEnable()
		{
			_resource = new ForwardGeocodeResource("");
			EditorApplication.playModeStateChanged += OnModeChanged;
		}

		void OnDisable()
		{
			EditorApplication.playModeStateChanged -= OnModeChanged;
		}

		bool hasSetFocus = false;

		public static void Open(SerializedProperty property, object objectToUpdate = null)
		{
			GeocodeAttributeSearchWindow window = EditorWindow.GetWindow<GeocodeAttributeSearchWindow>(true, "Search for location");

			window._coordinateProperty = property;
			if (objectToUpdate != null)
			{
				window._objectToUpdate = objectToUpdate;
			}

			Event e = Event.current;
			Vector2 mousePos = GUIUtility.GUIToScreenPoint(e.mousePosition);

			window.position = new Rect(mousePos.x - width, mousePos.y, width, height);
		}

		void OnModeChanged(PlayModeStateChange state)
		{
			Close();
		}

		void OnGUI()
		{
			GUILayout.Label("Search for a location");

			string oldSearchInput = _searchInput;

			GUI.SetNextControlName(searchFieldName);
			_searchInput = GUILayout.TextField(_searchInput);

			if (_searchInput.Length == 0)
			{
				GUILayout.Label("Type in a location to find it's latitude and longtitude");
			}
			else
			{
				bool changed = oldSearchInput != _searchInput;
				if (changed)
				{
					HandleUserInput(_searchInput);
				}

				if (_features.Count > 0)
				{
					GUILayout.Label("Results:");
					for (int i = 0; i < _features.Count; i++)
					{
						Feature feature = _features[i];
						string coordinates = feature.Center.x.ToString(CultureInfo.InvariantCulture) + ", " +
						                            feature.Center.y.ToString(CultureInfo.InvariantCulture);

						//abreviated coords for display in the UI
						string truncatedCoordinates = feature.Center.x.ToString("F2", CultureInfo.InvariantCulture) + ", " +
							feature.Center.y.ToString("F2", CultureInfo.InvariantCulture);

						//split feature name and add elements until the maxButtonContentLenght is exceeded
						string[] featureNameSplit = feature.PlaceName.Split(',');
						string buttonContent = "";
						int maxButtonContentLength = 30;
						for (int j = 0; j < featureNameSplit.Length; j++)
						{
							if(buttonContent.Length + featureNameSplit[j].Length < maxButtonContentLength)
							{
								if(String.IsNullOrEmpty(buttonContent))
								{
									buttonContent = featureNameSplit[j];
								}
								else
								{
									buttonContent = buttonContent + "," + featureNameSplit[j];
								}
							}
						}

						if (buttonContent.Length < maxButtonContentLength + 15)
						{
							buttonContent = buttonContent + "," + " (" + truncatedCoordinates + ")";
						}


						if (GUILayout.Button(buttonContent))
						{
							_coordinateProperty.stringValue = coordinates;
							_coordinateProperty.serializedObject.ApplyModifiedProperties();
							EditorUtility.SetDirty(_coordinateProperty.serializedObject.targetObject);

							if(_objectToUpdate != null)
							{
								EditorHelper.CheckForModifiedProperty(_coordinateProperty, _objectToUpdate, true);
							}
							Close();
						}
					}
				}
				else
				{
					if (_isSearching)
						GUILayout.Label("Searching...");
					else
						GUILayout.Label("No search results");
				}
			}

			if (!hasSetFocus)
			{
				GUI.FocusControl(searchFieldName);
				hasSetFocus = true;
			}
		}

		void HandleUserInput(string searchString)
		{
			_features = new List<Feature>();
			_isSearching = true;

			if (!string.IsNullOrEmpty(searchString))
			{
				_resource.Query = searchString;
				MapboxAccess.Instance.Geocoder.Geocode(_resource, HandleGeocoderResponse);
			}
		}

		void HandleGeocoderResponse(ForwardGeocodeResponse res)
		{
			//null if no internet connection
			if (res != null)
			{
				//null if invalid token
				if (res.Features != null)
				{
					_features = res.Features;
				}
			}
			_isSearching = false;
			this.Repaint();
		}
	}
}