using System.Diagnostics.CodeAnalysis;
using System.Net.Mail;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
using Flurl.Http;
using Innovenergy.Backend.Model;
using Innovenergy.Backend.Utils;
using InnovEnergy.Lib.Utils;
using SQLite;

#pragma warning disable CS0472
#pragma warning disable CS8602

namespace Innovenergy.Backend.Database;

public partial class Db
{
    private TableQuery<User> Users => _Db.Table<User>();

    public Int32 NbUsers => Users.Count();

    public User? GetUserById(Int64 id)
    {
        return Users.FirstOrDefault(u => u.Id == id);
    }

    public Boolean IsParentOfChild(User parent, User child)
    {
        var parentPointer = child.ParentId;

        if (parent.Id == child.Id)
            return true;

        while (parentPointer != null && parentPointer != parent.Id)
        {
            parentPointer = GetUserById(parentPointer).ParentId;
        }

        return parentPointer == parent.Id;
    }

    public User? GetUserByEmail(String email) => Users.FirstOrDefault(u => u.Email == email);

    public Result CreateUser(User user)
    {
        if (GetUserByEmail(user.Email) is not null)
            return Result.Error("User with that email already exists");

        //Salting and Hashing password
        var salt = Crypto.GenerateSalt();
        var hashedPassword = Crypto.ComputeHash(Encoding.UTF8.GetBytes(user.Password),
            Encoding.UTF8.GetBytes(salt + "innovEnergy"));

        user.Salt = salt;
        user.Password = hashedPassword;

        return Create(user);
    }

    [UnconditionalSuppressMessage("Trimming", "IL2026:Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code", Justification = "<Pending>")]
    public Object CreateAndSaveUserS3ApiKey(User user)
    {
        //EXOSCALE API URL
        const String url = "https://api-ch-dk-2.exoscale.com/v2/access-key";
        const String secret = "S2K1okphiCSNK4mzqr4swguFzngWAMb1OoSlZsJa9F0";
        const String apiKey = "EXOb98ec9008e3ec16e19d7b593";

        var installationList = User2Installation
            .Where(i => i.UserId == user.Id)
            .SelectMany(i => Installations.Where(f => i.InstallationId == f.Id))
            .ToList();

       
        var instList = new JsonArray();
        
        foreach (var installation in installationList)
        {
            instList.Add(new JsonObject {["domain"] = "sos",["resource-name"] = installation.Name,["resource-type"] = "bucket"});
        }
        
        var jsonPayload = new JsonObject { ["name"] = user.Email, ["operations"] = new JsonArray{ "getObject", "listBucket" }, ["content"] = instList};
        var expiration = DateTime.Now.AddSeconds(60);
        
        var signature = $"POST /v2/access-key\n{jsonPayload}\n\n\n{((DateTimeOffset)expiration).ToUnixTimeSeconds()}";
        using var hmacSha256 = new HMACSHA256(Encoding.UTF8.GetBytes(secret));
        
        signature = Encoding.UTF8
            .GetBytes(signature)
            .Apply(hmacSha256.ComputeHash)
            .Apply(Convert.ToBase64String);

        var keyJson = url
            .WithHeader("Authorization",
                $"EXO2-HMAC-SHA256 credential={apiKey},expires={((DateTimeOffset)expiration).ToUnixTimeSeconds()},signature={signature}");
        
        
        var result = keyJson.PostJsonAsync(jsonPayload.ToString())
            .ReceiveJson()
            .Result;
        return result;
        // return SetUserS3ApiKey(user, keyJson.GetValue("key"));
    }

    public Result SetUserS3ApiKey(User user, String key)
    {
        user.S3Key = key;
        return Update(user);
    }

    public Result UpdateUser(User user)
    {
        var oldUser = GetUserById(user.Id);
        if (oldUser == null)
            return Result.Error("User doesn't exist");

        //Checking for unchangeable things
        // TODO: depends on privileges of caller 

        user.Id = oldUser.Id;
        user.ParentId = oldUser.ParentId;
        user.Email = oldUser.Email;

        return Update(user);
    }

    public Result DeleteUser(User user)
    {
        User2Folder.Delete(u => u.UserId == user.Id);
        User2Installation.Delete(u => u.UserId == user.Id);

        //Todo check for orphaned Installations/Folders

        // GetChildUsers()

        return Delete(user);
    }


    // TODO
    private static Boolean IsValidEmail(String email)
    {
        try
        {
            var emailAddress = new MailAddress(email);
        }
        catch
        {
            return false;
        }

        return true;
    }
}