using System;
using TINK.Services.Geolocation;

namespace TINK.Model.Bikes.BikeInfoNS.BluetoothLock
{
	public class LockInfoMutable : ILockInfoMutable
	{
		/// <summary> Lock info object. </summary>
		private LockInfo LockInfo { get; set; }

		/// <summary>
		/// Delegate to create time stamp.
		/// </summary>
		private Func<DateTime> _nowDelegate;

		/// <summary> Constructs a bluetooth lock info object. </summary>
		/// <param name="id">Id of lock must always been known when constructing an lock info object.</param>
		/// <param name="nowDelegate">Delegate to create time stamp if null DateTime.Now is used.</param>
		public LockInfoMutable(
			int id,
			Guid guid,
			byte[] userKey,
			byte[] adminKey,
			byte[] seed,
			LockingState state,
			Func<DateTime> nowDelegate = null)
		{
			_nowDelegate = nowDelegate ?? (() => DateTime.Now);
			LockInfo = new LockInfo.Builder() { Id = id, Guid = guid, UserKey = userKey, AdminKey = adminKey, Seed = seed, State = state }.Build();
		}

		public int Id => LockInfo.Id;

		/// <summary> Changes during runtime: Can be unknown when set from copri and chang to a valid value when set from lock.</summary>
		public Guid Guid
		{
			get => LockInfo.Guid;
			set => LockInfo = new LockInfo.Builder(LockInfo) { Guid = value }.Build();
		}

		public byte[] Seed => LockInfo.Seed;

		public byte[] UserKey => LockInfo.UserKey;

		public byte[] AdminKey => LockInfo.AdminKey;

		/// <summary>
		/// Gets or sets the locking state.
		/// </summary>
		public LockingState State
		{
			get => LockInfo.State;
			set
			{
				if (LockInfo.State == value)
				{
					// State does not change, nothing to do.
					return;
				}

				Location = null; // Invalidate location.
				LastLockingStateChange = _nowDelegate(); // Get time stamp when state change happened.
				LockInfo = new LockInfo.Builder(LockInfo) { State = value }.Build();
			}
		}

		/// <summary> Gets the time stamp of the last locking state change.</summary>
		public DateTime? LastLockingStateChange { get; private set; }

		/// <summary>
		/// Gets or sets the current location of the bike, null if location is unknown.
		/// </summary>
		public IGeolocation Location { get; set; }

		/// <summary> Holds the percentage of lock battery.</summary>
		public double BatteryPercentage { get; set; } = double.NaN;

		/// <summary>
		/// Gets the version info of the lock.
		/// </summary>
		public IVersionInfo VersionInfo { get; set; } = new VersionInfo.Builder().Build();

		/// <summary> Loads lock info object from values. </summary>
		public void Load(int id, Guid guid, byte[] seed, byte[] userKey, byte[] adminKey)
		{
			LockInfo = new LockInfo.Builder(LockInfo) { Id = id, Guid = guid, Seed = seed, UserKey = userKey, AdminKey = adminKey }.Build();
		}
	}
}