/*
TShock, a server mod for Terraria
Copyright (C) 2011-2019 Pryaxis & TShock Contributors

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Newtonsoft.Json;
using Terraria;

namespace TShockAPI
{
	/// <summary>
	/// Represents an item.
	/// </summary>
	[JsonObject(MemberSerialization.OptIn)]
	public struct NetItem
	{
		/// <summary>
		/// 40 - The number of slots in a piggy bank
		/// </summary>
		public static readonly int PiggySlots = 40;

		/// <summary>
		/// 40 - The number of slots in a safe
		/// </summary>
		public static readonly int SafeSlots = PiggySlots;

		/// <summary>
		/// 40 - The number of slots in a forge
		/// </summary>
		public static readonly int ForgeSlots = SafeSlots;

		/// <summary>
		/// 40 - The number of slots in a void vault
		/// </summary>
		public static readonly int VoidSlots = ForgeSlots;

		/// <summary>
		/// 59 - The size of the player's inventory (inventory, coins, ammo, held item)
		/// </summary>
		public static readonly int InventorySlots = 59;

		/// <summary>
		/// 20 - The number of armor slots.
		/// </summary>
		public static readonly int ArmorSlots = 20;

		/// <summary>
		/// 5 - The number of other equippable items
		/// </summary>
		public static readonly int MiscEquipSlots = 5;

		/// <summary>
		/// 10 - The number of dye slots.
		/// </summary>
		public static readonly int DyeSlots = 10;

		/// <summary>
		/// 5 - The number of other dye slots (for <see cref="MiscEquipSlots"/>)
		/// </summary>
		public static readonly int MiscDyeSlots = MiscEquipSlots;

		/// <summary>
		/// 1 - The number of trash can slots.
		/// </summary>
		public static readonly int TrashSlots = 1;

		/// <summary>
		/// The number of armor slots in a loadout.
		/// </summary>
		public static readonly int LoadoutArmorSlots = ArmorSlots;

		/// <summary>
		/// The number of dye slots in a loadout.
		/// </summary>
		public static readonly int LoadoutDyeSlots = DyeSlots;

		/// <summary>
		/// 180 - The inventory size (inventory, held item, armour, dies, coins, ammo, piggy, safe, and trash)
		/// </summary>
		public static readonly int MaxInventory = InventorySlots + ArmorSlots + DyeSlots + MiscEquipSlots +
		                                          MiscDyeSlots + PiggySlots +
		                                          SafeSlots + ForgeSlots + VoidSlots + TrashSlots +
		                                          (LoadoutArmorSlots * 3) +
		                                          (LoadoutDyeSlots * 3);

		public static readonly (int, int) InventoryIndex = (0, InventorySlots);

		public static readonly (int, int) ArmorIndex =
			(InventoryIndex.Item2, InventoryIndex.Item2 + ArmorSlots);

		public static readonly (int, int) DyeIndex =
			(ArmorIndex.Item2, ArmorIndex.Item2 + DyeSlots);

		public static readonly (int, int) MiscEquipIndex =
			(DyeIndex.Item2, DyeIndex.Item2 + MiscEquipSlots);

		public static readonly (int, int) MiscDyeIndex =
			(MiscEquipIndex.Item2, MiscEquipIndex.Item2 + MiscDyeSlots);

		public static readonly (int, int) PiggyIndex =
			(MiscDyeIndex.Item2, MiscDyeIndex.Item2 + PiggySlots);

		public static readonly (int, int) SafeIndex =
			(PiggyIndex.Item2, PiggyIndex.Item2 + SafeSlots);

		public static readonly (int, int) TrashIndex =
			(SafeIndex.Item2, SafeIndex.Item2 + TrashSlots);

		public static readonly (int, int) ForgeIndex =
			(TrashIndex.Item2, TrashIndex.Item2 + ForgeSlots);

		public static readonly (int, int) VoidIndex =
			(ForgeIndex.Item2, ForgeIndex.Item2 + VoidSlots);

		public static readonly (int, int) Loadout1Armor =
			(VoidIndex.Item2, VoidIndex.Item2 + LoadoutArmorSlots);

		public static readonly (int, int) Loadout1Dye =
			(Loadout1Armor.Item2, Loadout1Armor.Item2 + LoadoutDyeSlots);

		public static readonly (int, int) Loadout2Armor =
			(Loadout1Dye.Item2, Loadout1Dye.Item2 + LoadoutArmorSlots);

		public static readonly (int, int) Loadout2Dye =
			(Loadout2Armor.Item2, Loadout2Armor.Item2 + LoadoutDyeSlots);

		public static readonly (int, int) Loadout3Armor =
			(Loadout2Dye.Item2, Loadout2Dye.Item2 + LoadoutArmorSlots);

		public static readonly (int, int) Loadout3Dye =
			(Loadout3Armor.Item2, Loadout3Armor.Item2 + LoadoutDyeSlots);

		[JsonProperty("netID")]
		private int _netId;

		[JsonProperty("prefix")]
		private byte _prefixId;

		[JsonProperty("stack")]
		private int _stack;

		[JsonProperty("favorited")]
		private bool _favorited;

		/// <summary>
		/// Gets the net ID.
		/// </summary>
		public int NetId
		{
			get { return _netId; }
		}

		/// <summary>
		/// Gets the prefix.
		/// </summary>
		public byte PrefixId
		{
			get { return _prefixId; }
		}

		/// <summary>
		/// Gets the stack.
		/// </summary>
		public int Stack
		{
			get { return _stack; }
		}

		/// <summary>
		/// Gets the favorited.
		/// </summary>
		public bool Favorited
		{
			get { return _favorited; }
		}


		/// <summary>
		/// Creates a new <see cref="NetItem"/>.
		/// </summary>
		/// <param name="netId">The net ID.</param>
		/// <param name="stack">The stack.</param>
		/// <param name="prefixId">The prefix ID.</param>
		/// <param name="favorited">The favorited.</param>
		public NetItem(int netId, int stack = 1, byte prefixId = 0, bool favorited = false)
		{
			_netId = netId;
			_stack = stack;
			_prefixId = prefixId;
			_favorited = favorited;
		}

		/// <summary>
		/// Creates a new <see cref="NetItem"/>.
		/// </summary>
		/// <param name="item">Item in the game.</param>
		public NetItem(Item item)
		{
			_netId = item.type;
			_stack = item.stack;
			_prefixId = item.prefix;
			_favorited = item.favorited;
		}

		/// <summary>
		/// Creates <see cref="Terraria.Item"/> based on data from this structure.
		/// </summary>
		/// <returns>A copy of the item.</returns>
		public Item ToItem()
		{
			Item item = new Item();

			item.netDefaults(_netId);
			item.stack = _stack;
			item.prefix = _prefixId;
			item.favorited = _favorited;

			return item;
		}

		/// <summary>
		/// Converts the <see cref="NetItem"/> to a string.
		/// </summary>
		/// <returns></returns>
		public override string ToString()
		{
			return String.Format("{0},{1},{2},{3}", _netId, _stack, _prefixId, _favorited ? 1 : 0);
		}

		/// <summary>
		/// Converts a string into a <see cref="NetItem"/>.
		/// </summary>
		/// <param name="str">The string.</param>
		/// <exception cref="ArgumentNullException"/>
		/// <exception cref="FormatException"/>
		/// <returns></returns>
		public static NetItem Parse(string str)
		{
			if (str == null)
				throw new ArgumentNullException("str");

			string[] comp = str.Split(',');
			if (comp.Length != 4)
				throw new FormatException("String does not contain 4 sections.");

			int netId = Int32.Parse(comp[0]);
			int stack = Int32.Parse(comp[1]);
			byte prefixId = Byte.Parse(comp[2]);
			bool favorited = Int32.Parse(comp[3]) == 1;

			return new NetItem(netId, stack, prefixId, favorited);
		}

		/// <summary>
		/// Converts an <see cref="Item"/> into a <see cref="NetItem"/>.
		/// </summary>
		/// <param name="item">The <see cref="Item"/>.</param>
		/// <returns></returns>
		public static explicit operator NetItem(Item item)
		{
			return item == null
				? new NetItem()
				: new NetItem(item.type, item.stack, item.prefix, item.favorited);
		}
	}
}