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(*
 *    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

let body () =
  let parameters = Uri.encoded_of_query
                     ["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 server =
  let callback _conn req _body =
    let meth = Request.meth req in
    match meth with
    | `GET ->
       body () >>= fun body ->
       let body = Ics.to_string @@ Course.decode body and
           headers = Header.init_with "Content-Type" "text/calendar" in
       Server.respond_string ~status:`OK ~body ~headers ()
    | _ ->
       Server.respond_string
         ~status:`Method_not_allowed ~body:"Method not allowed\n" () in
  Server.create ~mode:(`TCP (`Port 8080)) (Server.make ~callback ())

let () =
  ignore @@ Lwt_main.run server