using UnityEngine;
using System;

namespace Skatebirb.Util
{
	/// <summary>
	/// This is a market component that exists purely to be found by spawning things that need to spawn at a specific position, or under a specific parent
	/// </summary>
	public class SpawnLocationMarker : MonoBehaviour
	{
		static private SpawnLocationMarker atLeastOneExists;

		/// <summary>
		/// Finds a spawn location of the given name in the currently loaded scene
		/// </summary>
		/// <param name="locName">the name of location to find</param>
		/// <returns>the location, or NULL if none was found</returns>
		static public SpawnLocationMarker FindLocation(string locName)
		{
			if (atLeastOneExists == null) { return null; }

			return atLeastOneExists.FindLocationInternal(locName);
		}

		private SpawnLocationMarker FindLocationInternal(string locName)
		{
			if (string.IsNullOrEmpty(locName)) { return null; }

			// We're searching by name, let's NOT include case, because for fuck's sake
			locName = locName.ToLowerInvariant();

			// @TODO: We could cache this list on Awake, if we needed to? Though it's unlikely to ever be called that often.
			SpawnLocationMarker[] locations = FindObjectsOfType<SpawnLocationMarker>();
			foreach(SpawnLocationMarker location in locations)
			{
				if (location.gameObject.name.ToLowerInvariant() == locName) { return location; }
			}

			return null;
		}

		private void Awake()
		{
			// We do this so that we can do static operations that would normally require a MonoBehavior (like finding-by-component)
			atLeastOneExists = this;
		}
	}
}