namespace Cardone.Backoffice.ImageSearch.Controllers

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

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

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

    let getDeepestExceptionMessage (ex) =
        let rec getDeepestException (ex : exn) =
            match ex.InnerException with
                | null -> ex
                | _ -> getDeepestException(ex.InnerException)
        getDeepestException(ex).Message

    [<AllowAnonymous>]
    member this.Index() =
        this.HttpContext.Features.Get<IExceptionHandlerFeature>()
            |> Option.ofObj
            |> Option.bind (fun value -> Option.ofObj value.Error)
            |> Option.map (getDeepestExceptionMessage >> ErrorViewModel)
            |> Option.defaultValue (ErrorViewModel "Произошла непредвиденная ошибка")
            |> this.BadRequest