using System;
using System.IO;

namespace Dalamud.Game.Network.Structures
{
    /// <summary>
    /// Represents market board purchase information. This message is received from the
    /// server when a purchase is made at a market board.
    /// </summary>
    internal class MarketBoardPurchase
    {
        private MarketBoardPurchase()
        {
        }

        /// <summary>
        /// Gets the item ID of the item that was purchased.
        /// </summary>
        public uint CatalogId { get; private set; }

        /// <summary>
        /// Gets the quantity of the item that was purchased.
        /// </summary>
        public uint ItemQuantity { get; private set; }

        /// <summary>
        /// Reads market board purchase information from the struct at the provided pointer.
        /// </summary>
        /// <param name="dataPtr">A pointer to a struct containing market board purchase information from the server.</param>
        /// <returns>An object representing the data read.</returns>
        public static unsafe MarketBoardPurchase Read(IntPtr dataPtr)
        {
            using var stream = new UnmanagedMemoryStream((byte*)dataPtr.ToPointer(), 1544);
            using var reader = new BinaryReader(stream);

            var output = new MarketBoardPurchase();

            output.CatalogId = reader.ReadUInt32();
            stream.Position += 4;
            output.ItemQuantity = reader.ReadUInt32();

            return output;
        }
    }
}
