module Message =
struct
  type t =
    | IllegalCharacter
    | SyntaxError
    | UnboundVariable
    | IllTyped
    | CannotInferType
    | Bug

  let default_severity : t -> Asai.Diagnostic.severity =
    function
    | IllegalCharacter -> Error
    | SyntaxError -> Error
    | UnboundVariable -> Error
    | IllTyped -> Error
    | CannotInferType -> Error
    | Bug -> Bug

  let short_code : t -> string =
    function
    (* parser errors *)
    | IllegalCharacter -> "E101"
    | SyntaxError -> "E102"
    (* elaboration errors *)
    | UnboundVariable -> "E201"
    | IllTyped -> "E202"
    | CannotInferType -> "E202"
    (* misc *)
    | Bug -> "E900"
end

include Asai.Reporter.Make(Message)

let illegal_character ~loc char = fatalf ~loc IllegalCharacter "illegal character '%s'" (Char.escaped char)
let syntax_error ~loc = fatalf ~loc SyntaxError "syntax error"
let unbound_variable id = fatalf UnboundVariable "unbound variable '%a'" Ident.pp id
let expected_universe fmt x = fatalf IllTyped "expected a universe but got %a" fmt x

let bug msg = fatalf Bug msg