using Microsoft.EntityFrameworkCore;
using Shadow.Data;
using Shadow.Entities;
using System.Text;
using System.Xml.Serialization;

namespace Shadow.Tools;

public class GeneralUseHelpers(ApplicationDbContext? db = null, IConfiguration? appsettings = null)
{
	private readonly ApplicationDbContext? _db = db;
	private readonly IConfiguration? _appsettings = appsettings;


	//async public Task<User?> GetUserFromEmail(string email)
	//{
	//	return await _db.Users.FirstOrDefaultAsync(e => e.Email == email);
	//}

	//public string HashWithSHA512(string s)
	//{
	//	using (var sha512 = SHA512.Create())
	//	{
	//		byte[] bytes = Encoding.ASCII.GetBytes(s);
	//		byte[] hash = sha512.ComputeHash(bytes);
	//		string hashstring = BitConverter.ToString(hash).Replace("-", "").ToLower();
	//		return hashstring;
	//	}
	//}

	/// <summary>
	/// Quick and dirty Dictionary&lt;string, string&gt; to JSON serializer
	/// </summary>
	/// <param name="dict">Dictionary with keypair of two strings</param>
	/// <returns>Minified JSON</returns>
	public static string DictAsJson(Dictionary<string, string> dict)
	{
		string resultJson = String.Empty;

		foreach (string key in dict.Keys)
		{
			string cleanKey   = key.Replace("\"", "\\\"");       // "a"b" -> "a\"b"
			string cleanValue = dict[key].Replace("\"", "\\\"");
			resultJson += $"\"{cleanKey}\": \"{cleanValue}\", "  // "key": "val",<space>
				.Replace(@"\", @"\\");                           // a\b -> a\\b
		}

		return "{" + resultJson[..^2] + "}";
	}

	public async Task<User?> GetUserFromForm(HttpRequest request)
	{
		User? user = null;
		try
		{
			string username = request.Form["u"]!;
			string saltedPassword = request.Form["t"]!;
			string sesame = request.Form["s"]!;

			User? foundUser = _db?.Users
				.FirstOrDefault(u => u.NormalizedName == username.ToLower());

			if (foundUser == null)
				return user;

			string resaltedPassword = MetadataExtractor.GetStringMD5($"{foundUser.Password}{sesame}");
			if (resaltedPassword == saltedPassword)
				user = foundUser;
		}
		catch
		{
			user = null;
		}
		
		return user;
	}

	public async Task<User?> GetUserFromParams(HttpRequest request)
	{
		User? user = null;
		try
		{
			string username = request.Query["u"]!;
			string saltedPassword = request.Query["t"]!;
			string sesame = request.Query["s"]!;

			User foundUser = _db!.Users
				.FirstOrDefault(u => u.NormalizedName == username.ToLower())!;

			string resaltedPassword = MetadataExtractor.GetStringMD5($"{foundUser.Password}{sesame}");
			if (resaltedPassword == saltedPassword)
				user = foundUser;
		}
		catch
		{
			user = null;
		}

		return user;
	}
}