using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO;
using System.Reflection;

namespace Mag.Shared.Spells
{
	public static class SpellTools
	{
		static readonly List<string> SpellTableHeader = new List<string>();
		static readonly Collection<string[]> SpellTable = new Collection<string[]>();

		static readonly Dictionary<int, Spell> SpellsById = new Dictionary<int, Spell>();

		static SpellTools()
		{
			var resourceNames = Assembly.GetExecutingAssembly().GetManifestResourceNames();

			if (resourceNames.Length == 0)
				return;

			var rootNameSpace = resourceNames[0].Substring(0, resourceNames[0].IndexOf('.'));

			using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(rootNameSpace + ".Shared.Spells.Spells.csv"))
			{
				if (stream != null)
				{
					using (StreamReader reader = new StreamReader(stream))
					{
						SpellTableHeader = new List<string>(reader.ReadLine().Split(','));

						while (!reader.EndOfStream)
							SpellTable.Add(reader.ReadLine().Split(','));
					}
				}
			}
		}

		/// <summary>
		/// Will return null if no spell was found.
		/// </summary>
		public static Spell GetSpell(int id)
		{
            if (SpellsById.TryGetValue(id, out var spell))
                return spell;

			int idIndex = SpellTableHeader.IndexOf("Id");

			foreach (string[] line in SpellTable)
			{
				if (line[idIndex] == id.ToString(CultureInfo.InvariantCulture))
					return GetSpell(line);
			}

			//throw new ArgumentException("Spell of id: " + id + " not found in Spells.csv");
			return null;
		}

		/// <summary>
		/// Will return null if no spell was found.
		/// </summary>
		public static Spell GetSpell(string name)
		{
			foreach (var kvp in SpellsById)
			{
				if (String.Equals(kvp.Value.Name, name, StringComparison.OrdinalIgnoreCase))
					return kvp.Value;
			}

			int nameIndex = SpellTableHeader.IndexOf("Name");

			foreach (string[] line in SpellTable)
			{
				if (String.Equals(line[nameIndex], name, StringComparison.OrdinalIgnoreCase))
					return GetSpell(line);
			}

			//throw new ArgumentException("Spell of name: " + name + " not found in Spells.csv");
			return null;
		}

		private static Spell GetSpell(string[] splitLine)
		{
			int idIndex = SpellTableHeader.IndexOf("Id");
			int nameIndex = SpellTableHeader.IndexOf("Name");
			int difficultyIndex = SpellTableHeader.IndexOf("Difficulty");
			int durationIndex = SpellTableHeader.IndexOf("Duration");
			int familyIndex = SpellTableHeader.IndexOf("Family");

			int id;
			int.TryParse(splitLine[idIndex], out id);

			string name = splitLine[nameIndex];

			int difficulty;
			int.TryParse(splitLine[difficultyIndex], out difficulty);

			int duration;
			int.TryParse(splitLine[durationIndex], out duration);

			int family;
			int.TryParse(splitLine[familyIndex], out family);

			var spell = new Spell(id, name, difficulty, duration, family);

			if (!SpellsById.ContainsKey(spell.Id))
				SpellsById.Add(spell.Id, spell);

			return spell;
		}

		public static bool IsAKnownSpell(int id)
		{
			if (SpellsById.ContainsKey(id))
				return true;

			int idIndex = SpellTableHeader.IndexOf("Id");

			foreach (string[] line in SpellTable)
			{
				if (line[idIndex] == id.ToString(CultureInfo.InvariantCulture))
					return true;
			}

			return false;
		}

		public static bool IsAKnownSpell(string name)
		{
			foreach (var kvp in SpellsById)
			{
				if (String.Equals(kvp.Value.Name, name, StringComparison.OrdinalIgnoreCase))
					return true;
			}

			int nameIndex = SpellTableHeader.IndexOf("Name");

			foreach (string[] line in SpellTable)
			{
				if (line[nameIndex] == name)
					return true;
			}

			return false;
		}
	}
}