using System;
using System.Linq;
using System.Security.Claims;
using LCU.Library.Internal.IncentiveApiModels.Entities;
using Microsoft.AspNetCore.Http;
using Serilog;

namespace LCU.API.Internal.Operations.IncentiveApiLib.Persistence;

public class CurrentUserService : ICurrentUserService
{
    protected readonly IHttpContextAccessor HttpContextAccessor;

    public CurrentUserService(IHttpContextAccessor httpContextAccessor)
    {
        HttpContextAccessor = httpContextAccessor;
    }

    public ApplicationUser GetCurrentUser()
    {
        try
        {
            if (HttpContextAccessor != null && HttpContextAccessor.HttpContext != null)
            {
                var userClaimsPrincipal = HttpContextAccessor.HttpContext.User;
                var parsedApplicationUser = new ApplicationUser
                {
                    FirstName = userClaimsPrincipal.Claims.FirstOrDefault(claim => claim.Type == ClaimTypes.GivenName)?.Value,
                    LastName = userClaimsPrincipal.Claims.FirstOrDefault(claim => claim.Type == ClaimTypes.Surname)?.Value,
                    Email = userClaimsPrincipal.Claims.FirstOrDefault(claim => claim.Type == ClaimTypes.Upn)?.Value,
                    Roles = userClaimsPrincipal.Claims.Where((claim) => claim.Type == ClaimTypes.Role).Select((claim) => claim?.Value).ToArray(),
                    IsSystem = false,
                };
                Log.Debug($"ApplicationUser: {parsedApplicationUser.Email} successfully parsed from HttpContext");
                return parsedApplicationUser;
            }

            Log.Debug("HttpContextAccessor or HttpContext are null, returning default System ApplicationUser");
            return DefaultSystemApplicationUser();
        }
        catch (Exception ex)
        {
            Log.Error(ex, ex.Message);
            return DefaultSystemApplicationUser();
        }
    }

    private ApplicationUser DefaultSystemApplicationUser()
    {
        return new ApplicationUser()
        {
            FirstName = "Incentive",
            LastName = "Manager",
            Email = "",
            Roles = new[] { Role.UNKNOWN_ROLE.Name },
            IsSystem = true
        };
    }
}