(*
 *    Copyright (C) 2020  Alban Gruin
 *
 *    ucs is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU Affero General Public License as published
 *    by the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    ucs is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with ucs.  If not, see <http://www.gnu.org/licenses/>.
 *)

open Lwt
open Cohttp
open Cohttp_lwt_unix

module J = Json_encoding

type course = {
    start: string;
    stop: string;
    description: string;
    category: string;
    place: string }

let encoding =
  J.(conv
       (fun _ -> ("", "", "", false, "", (), (), (), (), ""),
                 ([], None, (), (), (), (), ()))
       (fun ((_id, start, stop, _allDay, description, (), (), (), (), category),
             (_sites, _modules, (), (), (), (), ())) ->
         {start; stop; description; category; place=""})
       (merge_objs
          (obj10
             (req "id" string)
             (req "start" string)
             (req "end" string)
             (req "allDay" bool)
             (req "description" string)
             (req "backgroundColor" unit)
             (req "textColor" unit)
             (req "department" unit)
             (req "faculty" unit)
             (req "eventCategory" string))
          (obj7
             (req "sites" @@ list string)
             (req "modules" @@ option (list string))
             (req "registerStatus" unit)
             (req "studentMark" unit)
             (req "custom1" unit)
             (req "custom2" unit)
             (req "custom3" unit))))

let decode enc s =
  let toks =
    match s with
    | "" -> `O []
    | s -> Ezjsonm.from_string s in
  J.destruct enc toks

let body =
  let parameters = "start=2020-09-01&end=2020-10-01&resType=103&calView=month&federationIds[]=IINS9CMA&colourScheme=3" in
  let body = Cohttp_lwt.Body.of_string parameters and
      headers = Header.init_with "Content-Type" "application/x-www-form-urlencoded" in
  Client.post ~body ~headers (Uri.of_string "https://edt.univ-tlse3.fr/calendar2/Home/GetCalendarData") >>= fun (_resp, body) ->
  Cohttp_lwt.Body.to_string body

let () =
  let body = Lwt_main.run body in
  List.iter (fun {start; stop; description; category; place} ->
      Printf.printf "%s\n%s\n%s\n%s\n%s\n\n" start stop description category place)
  @@ decode (J.list encoding) body