using System;
using System.ComponentModel;
using System.Text;
using Newtonsoft.Json;


namespace BizHawk.Client.Common
{
	public class TasStateManagerSettings
	{
		public TasStateManagerSettings()
		{
			DiskSaveCapacitymb = 512;
			Capacitymb = 512;
			DiskCapacitymb = 512;
		}

		public TasStateManagerSettings(TasStateManagerSettings settings)
		{
			DiskSaveCapacitymb = settings.DiskSaveCapacitymb;
			Capacitymb = settings.Capacitymb;
			DiskCapacitymb = settings.DiskCapacitymb;
		}

		/// <summary>
		/// Whether or not to save state history information to disk
		/// </summary>
		[DisplayName("Save History")]
		[Description("Whether or not to use savestate history")]
		public bool SaveStateHistory { get { return DiskSaveCapacitymb != 0; } }

		/// <summary>
		/// The size limit to use when saving the tas project to disk.
		/// </summary>
		[DisplayName("Save Capacity (in megabytes)")]
		[Description("The size limit to use when saving the tas project to disk.")]
		public int DiskSaveCapacitymb { get; set; }

		/// <summary>
		/// The total amount of memory to devote to state history in megabytes
		/// </summary>
		[DisplayName("Capacity (in megabytes)")]
		[Description("The size limit of the state history buffer.  When this limit is reached it will start moving to disk.")]
		public int Capacitymb { get; set; }

		/// <summary>
		/// The total amount of disk space to devote to state history in megabytes
		/// </summary>
		[DisplayName("Disk Capacity (in megabytes)")]
		[Description("The size limit of the state history buffer on the disk.  When this limit is reached it will start removing previous savestates")]
		public int DiskCapacitymb { get; set; }

		/// <summary>
		/// The total state capacity in bytes.
		/// </summary>
		[JsonIgnore]
		[Browsable(false)]
		public ulong CapTotal
		{
			get { return (ulong)(Capacitymb + DiskCapacitymb) * 1024UL * 1024UL; }
		}

		/// <summary>
		/// The memory state capacity in bytes.
		/// </summary>
		[JsonIgnore]
		[Browsable(false)]
		public ulong Cap
		{
			get { return (ulong)Capacitymb * 1024UL * 1024UL; }
		}

		public override string ToString()
		{
			StringBuilder sb = new StringBuilder();

			sb.AppendLine(DiskSaveCapacitymb.ToString());
			sb.AppendLine(Capacitymb.ToString());
			sb.AppendLine(DiskCapacitymb.ToString());

			return sb.ToString();
		}

		public void PopulateFromString(string settings)
		{
			if (!string.IsNullOrWhiteSpace(settings))
			{
				string[] lines = settings.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
				Capacitymb = int.Parse(lines[1]);
				int refCapacity;
				if (!int.TryParse(lines[0], out refCapacity))
				{
					if (bool.Parse(lines[0]))
						DiskSaveCapacitymb = Capacitymb;
					else
						DiskSaveCapacitymb = 0;
				}
				else
					DiskSaveCapacitymb = refCapacity;
				if (lines.Length > 2)
					DiskCapacitymb = int.Parse(lines[2]);
				else
					DiskCapacitymb = 512;
			}
		}
	}
}
