namespace Cardone.Backoffice.ImageSearch.Controllers

open Microsoft.AspNetCore.Mvc
open Microsoft.AspNetCore.Authorization
open Microsoft.AspNetCore.Diagnostics
open System

type ErrorViewModel(message:string) =
    member __.Message with get() = message
    new() = ErrorViewModel(null)

[<Route("error")>]
type ErrorController() =
    inherit ControllerBase()

    let unrollException (ex : Exception) =
        let mutable currentException = ex
        while not(isNull(currentException.InnerException)) do
            currentException <- currentException.InnerException
        currentException;

    let getExceptionMessage (ex : Exception) =
        let lastException = unrollException(ex)
        lastException.Message


    [<AllowAnonymous>]
    member this.Index() =
        let feature = this.HttpContext.Features.Get<IExceptionHandlerFeature>()
        let errorViewModel =
            if not(isNull(feature)) && not(isNull(feature.Error))
                then ErrorViewModel(getExceptionMessage(feature.Error))
            else ErrorViewModel()
        this.BadRequest(errorViewModel)