using System;
using System.Collections.Concurrent;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.IO;
using System.Linq;
using System.Threading;
using UnityEngine;

namespace BepInEx.Configuration.Tests
{
	[TestClass]
	public class ConfigFileTests
	{
		private static ConcurrentBag<ConfigFile> _toRemove;

		[ClassInitialize]
		public static void Init(TestContext context)
		{
			_toRemove = new ConcurrentBag<ConfigFile>();
		}

		[ClassCleanup]
		public static void Cleanup()
		{
			foreach (var configFile in _toRemove)
				File.Delete(configFile.ConfigFilePath);
		}

		private static ConfigFile MakeConfig()
		{
			string configPath = Path.GetTempFileName();
			if (configPath == null) throw new InvalidOperationException("Wtf");
			var config = new ConfigFile(configPath, true);
			_toRemove.Add(config);
			return config;
		}

		[TestMethod]
		public void SaveTest()
		{
			MakeConfig().Save();
		}

		[TestMethod]
		public void SaveTestValueChange()
		{
			var c = MakeConfig();

			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));
			var lines = File.ReadAllLines(c.ConfigFilePath);
			Assert.AreEqual(1, lines.Count(x => x.Equals("[Cat]")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("## Test")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("Key = 0")));

			c.Save();
			lines = File.ReadAllLines(c.ConfigFilePath);
			Assert.AreEqual(1, lines.Count(x => x.Equals("[Cat]")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("## Test")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("Key = 0")));

			w.Value = 69;
			lines = File.ReadAllLines(c.ConfigFilePath);
			Assert.AreEqual(1, lines.Count(x => x.Equals("[Cat]")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("## Test")));
			Assert.AreEqual(1, lines.Count(x => x.Equals("Key = 69")));
		}

		[TestMethod]
		public void AutoSaveTest()
		{
			var c = MakeConfig();
			c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));

			var eventFired = new AutoResetEvent(false);
			c.ConfigReloaded += (sender, args) => eventFired.Set();

			c.Save();

			Assert.IsFalse(eventFired.WaitOne(200));
		}

		[TestMethod]
		public void ReadTest()
		{
			var c = MakeConfig();
			File.WriteAllText(c.ConfigFilePath, "[Cat]\n# Test\nKey=1\n");
			c.Reload();
			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));
			Assert.AreEqual(w.Value, 1);
			var w2 = c.AddSetting("Cat", "Key2", 0, new ConfigDescription("Test"));
			Assert.AreEqual(w2.Value, 0);
		}

		[TestMethod]
		public void ReadTest2()
		{
			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));
			Assert.AreEqual(w.Value, 0);

			File.WriteAllText(c.ConfigFilePath, "[Cat]\n# Test\nKey = 1 \n");

			c.Reload();
			Assert.AreEqual(w.Value, 1);
		}

		[TestMethod]
		public void FileWatchTestNoSelfReload()
		{
			var c = MakeConfig();

			var eventFired = new AutoResetEvent(false);
			c.ConfigReloaded += (sender, args) => eventFired.Set();

			c.Save();

			Assert.IsFalse(eventFired.WaitOne(200));
		}

		[TestMethod]
		public void EventTestWrapper()
		{
			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));

			File.WriteAllText(c.ConfigFilePath, "[Cat]\n# Test\nKey=1\n");

			var eventFired = false;
			w.SettingChanged += (sender, args) => eventFired = true;

			c.Reload();

			Assert.IsTrue(eventFired);
		}

		[TestMethod]
		public void PersistHomeless()
		{
			var c = MakeConfig();

			File.WriteAllText(c.ConfigFilePath, "[Cat]\n# Test\nKey=1\nHomeless=0");
			c.Reload();

			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));

			c.Save();

			Assert.IsTrue(File.ReadAllLines(c.ConfigFilePath).Single(x => x.StartsWith("Homeless") && x.EndsWith("0")) != null);
		}

		[TestMethod]
		public void EventTestReload()
		{
			var c = MakeConfig();
			var eventFired = false;

			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test"));
			w.SettingChanged += (sender, args) => eventFired = true;

			Assert.IsFalse(eventFired);

			File.WriteAllText(c.ConfigFilePath, "[Cat]\n# Test\nKey=1\n");
			c.Reload();

			Assert.IsTrue(eventFired);
		}

		[TestMethod]
		public void ValueRangeTest()
		{
			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test", new AcceptableValueRange<int>(0, 2)));

			Assert.AreEqual(0, w.Value);
			w.Value = 2;
			Assert.AreEqual(2, w.Value);
			w.Value = -2;
			Assert.AreEqual(0, w.Value);
			w.Value = 4;
			Assert.AreEqual(2, w.Value);
		}

		[TestMethod]
		[ExpectedException(typeof(ArgumentException))]
		public void ValueRangeBadTypeTest()
		{
			var c = MakeConfig();
			c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test", new AcceptableValueRange<float>(1, 2)));
			Assert.Fail();
		}

		[TestMethod]
		public void ValueRangeDefaultTest()
		{
			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test", new AcceptableValueRange<int>(1, 2)));

			Assert.AreEqual(w.Value, 1);
		}

		[TestMethod]
		public void ValueRangeLoadTest()
		{
			var c = MakeConfig();

			File.WriteAllText(c.ConfigFilePath, "[Cat]\nKey = 1\n");
			c.Reload();

			var w = c.AddSetting("Cat", "Key", 0, new ConfigDescription("Test", new AcceptableValueRange<int>(0, 2)));

			Assert.AreEqual(w.Value, 1);

			File.WriteAllText(c.ConfigFilePath, "[Cat]\nKey = 5\n");
			c.Reload();

			Assert.AreEqual(w.Value, 2);
		}

		[TestMethod]
		public void ValueListTest()
		{
			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", "kek", new ConfigDescription("Test", new AcceptableValueList<string>("lel", "kek", "wew", "why")));

			Assert.AreEqual("kek", w.Value);
			w.Value = "wew";
			Assert.AreEqual("wew", w.Value);
			w.Value = "no";
			Assert.AreEqual("lel", w.Value);
			w.Value = null;
			Assert.AreEqual("lel", w.Value);
		}

		[TestMethod]
		public void KeyboardShortcutTest()
		{
			var shortcut = new KeyboardShortcut(KeyCode.H, KeyCode.O, KeyCode.R, KeyCode.S, KeyCode.E, KeyCode.Y);
			var s = shortcut.Serialize();
			var d = KeyboardShortcut.Deserialize(s);
			Assert.AreEqual(shortcut, d);

			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", new KeyboardShortcut(KeyCode.A, KeyCode.LeftShift));
			Assert.AreEqual(new KeyboardShortcut(KeyCode.A, KeyCode.LeftShift), w.Value);

			w.Value = shortcut;
			c.Reload();
			Assert.AreEqual(shortcut, w.Value);
		}

		[TestMethod]
		public void KeyboardShortcutTest2()
		{
			Assert.AreEqual(KeyboardShortcut.Empty, new KeyboardShortcut());

			var c = MakeConfig();

			var w = c.AddSetting("Cat", "Key", KeyboardShortcut.Empty, new ConfigDescription("Test"));

			Assert.AreEqual("", w.ConfigEntry.GetSerializedValue());

			w.ConfigEntry.SetSerializedValue(w.ConfigEntry.GetSerializedValue());
			Assert.AreEqual(KeyboardShortcut.Empty, w.Value);

			var testShortcut = new KeyboardShortcut(KeyCode.A, KeyCode.B, KeyCode.C);
			w.Value = testShortcut;

			w.ConfigEntry.SetSerializedValue(w.ConfigEntry.GetSerializedValue());
			Assert.AreEqual(testShortcut, w.Value);

			c.Save();
			c.Reload();

			Assert.AreEqual(testShortcut, w.Value);
		}

		[TestMethod]
		public void StringEscapeChars()
		{
			const string testVal = "new line\n test \t\0";

			var c = MakeConfig();
			var w = c.AddSetting("Cat", "Key", testVal, new ConfigDescription("Test"));

			Assert.AreEqual(testVal, w.Value);
			Assert.IsFalse(w.ConfigEntry.GetSerializedValue().Any(x => x == '\n'));

			w.ConfigEntry.SetSerializedValue(w.ConfigEntry.GetSerializedValue());
			Assert.AreEqual(testVal, w.Value);

			c.Save();
			c.Reload();

			Assert.AreEqual(testVal, w.Value);
		}

		[TestMethod]
		public void UnescapedPathString()
		{
			var c = MakeConfig();

			var unescaped = @"D:\test\p ath";
			foreach (string testVal in new[] { unescaped, @"D:\\test\\p ath" })
			{
				File.WriteAllText(c.ConfigFilePath, $"[Cat]\n# Test\nKey={testVal}\n");
				c.Reload();

				var w = c.AddSetting("Cat", "Key", "", new ConfigDescription("Test"));

				Assert.AreEqual(unescaped, w.Value);

				w.ConfigEntry.SetSerializedValue(w.ConfigEntry.GetSerializedValue());
				Assert.AreEqual(unescaped, w.Value);

				c.Save();
				c.Reload();

				Assert.AreEqual(unescaped, w.Value);
			}
		}
	}
}