open Pusk.Net
open Pusk.Drivers
open Pusk.Utils
open Twitter

let start driver =
  let name_driver = prepare driver in
  let data_driver = run_process name_driver [] in
  let session_id =
    try get_session () with
    | Any msg ->
      stop_process data_driver;
      raise (Any ("Can't get the session ID: " ^ msg))
  in
  data_driver, session_id
;;

let stop (driver_process, session_id) =
  if not (close_session session_id) then print_endline "Can't close the session";
  stop_process driver_process
;;

let rec check ctx =
  (* Loop *)
  let max_time = 2505600 (* 29 days *) in
  let recheck timeout =
    if ctx.debug
    then print_endline (fmt "Waiting for the next check in %d seconds" timeout);
    Unix.sleep timeout;
    if ctx.debug then print_endline "Refresh profile page...";
    refresh_page ctx.session_id;
    Unix.sleep 8;
    check ctx
  in
  (* Time to wait until next check *)
  let timeout =
    if ctx.debug then print_endline "Check latest tweets...";
    match find_latest_tweet ctx with
    | Some tweet_date ->
      (* Get date of tweet and return time to wait before tweeting *)
      let now = Float.to_int (Unix.time ()) in
      let diff = now - tweet_date in
      if diff > max_time
      then 0 (* Timeout expired *)
      else max_time - diff (* Timeout for when it will expire *)
    | None ->
      if ctx.debug then print_endline "No tweets found...";
      0
  in
  if 0 = timeout
  then (
    if ctx.debug then print_endline "Tweeting...";
    let message =
      "This tweet is for the Twitter's CTO: don't suspend my account for inactivity."
      ^ if ctx.hashtag then "#puskbot" else ""
    in
    (* Tweet *)
    tweet ctx message;
    (* Returns to profile page *)
    go_to_profile ctx;
    (* Wait the maximum time since we just tweeted *)
    recheck max_time)
  else (* Wait the amount of time calculated from the post *)
    recheck timeout
;;

let main ctx =
  let username, password =
    match Sys.getenv_opt "TWITTER_USERNAME", Sys.getenv_opt "TWITTER_PASSWORD" with
    | Some u, Some p -> u, p
    | None, None -> raise (Any "Username and password not set")
    | None, Some _ -> raise (Any "Username not set")
    | Some _, None -> raise (Any "Password not set")
  in
  login_twitter ctx username password (Sys.getenv_opt "TWITTER_TOTP");
  go_to_profile ctx;
  (* Start check routine *)
  if ctx.debug then print_endline "Start routine...";
  check ctx
;;

let handler data (signal : int) =
  stop_process data;
  exit
    (match signal with
     | v when v = Sys.sigint -> 130
     | _ -> 1)
;;

let () =
  let data = start (Gecko "0.34.0") in
  Sys.set_signal Sys.sigint (Sys.Signal_handle (handler (fst data)));
  (* Load env variables *)
  load_dotenv;
  let ctx =
    { session_id = snd data
    ; debug = boolean_env "PUSK_DEBUG"
    ; hashtag = boolean_env "PUSK_HASHTAG"
    }
  in
  if ctx.debug then print_endline "Logging is enabled";
  (try main ctx with
   | Any why -> print_endline why);
  stop data
;;