using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Input;
using NetLimiter.Service;
using tsf_3074.Data;

namespace tsf_3074
{
	public static class Tsf
	{
		private const string Prefix = "tsf"; // thirty-seventy-four

		private static NLClient _client;

		private static NLClient GetClient()
		{
			if (_client != null) return _client;
			_client = new NLClient();
			_client.Connect();
			return _client;
		}

		private static string GetFilterNameFor(string portName, bool upload = false)
		{
			return upload ? $"{Prefix}_{portName}_ul" : $"{Prefix}_{portName}";
		}

		private static TsfFilter CreateFilter(string portName, ushort portStart, ushort portEnd, bool upload = false,
			uint fs = 0, uint vk = 0)
		{
			var cli = GetClient();
			var name = GetFilterNameFor(portName, upload);
			var filter = cli.Filters.FirstOrDefault(f => f.Name == name) ??
			             cli.AddFilter(new Filter(name)
			             {
				             Functions =
				             {
					             new FFPathEqual(Config.Instance.Destiny2Path),
					             new FFRemotePortInRange(new PortRangeFilterValue(portStart, portEnd))
				             }
			             });
			var hotkey = Config.Instance.Hotkeys[name];
			if (hotkey != null)
			{
				vk = hotkey.vk;
				fs = hotkey.fs;
			}

			return new TsfFilter(name, filter, cli, upload, 1, fs, vk);
		}

		private static TsfFilter CreateFilterFullGame(uint fs, uint vk)
		{
			var cli = GetClient();
			var name = GetFilterNameFor("fg");
			var filter = cli.Filters.FirstOrDefault(f => f.Name == name) ??
			             cli.AddFilter(new Filter(name)
			             {
				             Functions = { new FFPathEqual(Config.Instance.Destiny2Path) }
			             });
			var hotkey = Config.Instance.Hotkeys[name];
			if (hotkey != null)
			{
				vk = hotkey.vk;
				fs = hotkey.fs;
			}

			return new TsfFilter(name, filter, cli, false, 811, fs, vk);
		}

		public static readonly TsfFilter F3074;
		public static readonly TsfFilter F3074UL;
		public static readonly TsfFilter F7500;
		public static readonly TsfFilter F27K;
		public static readonly TsfFilter F30K;
		public static readonly TsfFilter FFullGame;

		static Tsf()
		{
			F3074 = CreateFilter("3074", 3074, 3074, false, VirtualKey.ModCtrl, VirtualKey.VkG);
			F3074UL = CreateFilter("3074", 3074, 3074, true, VirtualKey.ModCtrl, VirtualKey.VkH);
			F7500 = CreateFilter("7500", 7500, 7509, false, VirtualKey.ModCtrl, VirtualKey.VkT);
			F27K = CreateFilter("27k", 27015, 27200, false, VirtualKey.ModAlt, VirtualKey.VkN);
			F30K = CreateFilter("30k", 30000, 30009, false, VirtualKey.ModAlt, VirtualKey.VkB);
			FFullGame = CreateFilterFullGame(VirtualKey.ModCtrl, VirtualKey.VkJ);
		}
	}

	public class TsfFilter
	{
		private readonly string _name;
		private readonly Filter _filter;
		private readonly NLClient _client;
		private readonly bool _upload;
		private readonly uint _limitSize; // the limit rate, normally is 1, only FG is 800 or 811

		private uint _fs;
		private uint _vk;

		public string Name => _name;
		
		public uint FS => _fs;
		public uint VK => _vk;

		private Rule _rule;

		/**
		 * Invoked every time the IsEnable is changed. (Maybe not actually changed, like from false to false.)
		 */
		public event OnEvent OnStateChanged = delegate { };

		public static readonly List<TsfFilter> AllFilters = new List<TsfFilter>();

		public TsfFilter(string name, Filter filter, NLClient client, bool upload, uint limitSize = 1, uint fs = 0,
			uint vk = 0)
		{
			_name = name;
			_filter = filter;
			_client = client;
			_upload = upload;
			_limitSize = limitSize;
			_fs = fs;
			_vk = vk;

			InitLimitRule();

			AllFilters.Add(this);
		}

		~TsfFilter()
		{
			AllFilters.Remove(this);
		}

		/**
		 * Set the keybindings. Need to reload the hotkey manager manually!
		 */
		public void SetHotkey(uint vk, uint fs)
		{
			_vk = vk;
			_fs = fs;
		}

		/**
		 * Register the hotkey to the HotkeyManager.
		 */
		internal void RegisterHotkey(HotkeyManager manager)
		{
			if (_vk != 0)
			{
				Console.WriteLine(
					$"Registering Hotkey for {_name} {VirtualKey.GetModifierName(_fs)} + {KeyInterop.KeyFromVirtualKey((int)_vk)}");
				manager.RegisterHotkey(_fs, _vk, () =>
				{
					Toggle();
					Console.WriteLine($"Updated {_name} to {GetState()}");
				});
			}
		}

		private void InitLimitRule()
		{
			if (_rule != null) return;
			var dir = _upload ? RuleDir.Out : RuleDir.In;
			_rule = _client.Rules.FirstOrDefault(r => r.FilterId == _filter.Id && r.Dir == dir) ??
			        _client.AddRule(_filter.Id, new LimitRule(dir, _limitSize) { IsEnabled = false });
		}

		public void Toggle()
		{
			_rule.IsEnabled = !_rule.IsEnabled;
			_rule = _client.UpdateRule(_rule).Rule;
			OnStateChanged.Invoke();
		}

		public void Set(bool value)
		{
			_rule.IsEnabled = value;
			_rule = _client.UpdateRule(_rule).Rule;
			OnStateChanged.Invoke();
		}

		public bool IsEnabled()
		{
			return _rule?.IsEnabled ?? false;
		}

		public string GetState()
		{
			return IsEnabled() ? "On" : "Off";
		}
	}
}