using System.Text.Json.Nodes;
using InnovEnergy.Lib.Utils;

namespace InnovEnergy.Lib.Victron.VictronVRM;

public class VrmAccount : IDisposable
{
    public String Auth   { get; }
    public UInt64 UserId { get; } 

    private VrmAccount(UInt64 userId, String auth)
    {
        Auth = auth;
        UserId = userId;
    }
    
    public static VrmAccount Token(UInt64 userId, String token)
    {
        return new VrmAccount(userId, $"Token {token}");
    }

    public static async Task<VrmAccount> Login(String username, String password)
    {
        var credentials = new JsonObject
        {
            ["username"] = username,
            ["password"] = password,
        };

        var login  = await Requests.LoginRequest.TryPostJson(credentials);
        var idUser = login.GetUInt64("idUser"); 
        var token  = login.GetString("token");
        
        return new VrmAccount(idUser, $"Bearer {token}");
    }
    
    private async Task Logout() => await this.LogoutRequest().TryPostJson();

    public async Task<IReadOnlyList<Installation>> GetInstallations()
    {
        var reply = await this.AllInstallationsRequest().TryGetJson();
        var vrmReply = new Reply(reply);
        
        if (!vrmReply.Success)
            throw new Exception(nameof(GetInstallations) + " failed");

        return vrmReply
              .Records
              .Select(r => new Installation(this, r!))
              .ToArray(vrmReply.Records.Count);
    }

    public void Dispose()
    {
        if (IsLoggedIn)
            Logout().Wait();
    }

    private Boolean IsLoggedIn => Auth.StartsWith("Bearer ");
}