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(**************************************************************************)
(*                                BELENIOS                                *)
(*                                                                        *)
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(*  Copyright © 2012-2014 Inria                                           *)
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(*                                                                        *)
(*  This program 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, with the additional   *)
(*  exemption that compiling, linking, and/or using OpenSSL is allowed.   *)
(*                                                                        *)
(*  This program 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 this program.  If not, see                         *)
(*  <http://www.gnu.org/licenses/>.                                       *)
(**************************************************************************)

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open Lwt
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open Serializable_t
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open Signatures
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open Common
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open Web_serializable_j
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open Web_common
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open Web_signatures
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module type CONFIG = sig
  val name : string
  val path : string list
  val source_file : string
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  val spool_dir : string
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  val auth_config : auth_config list
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end
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let rec list_remove x = function
  | [] -> []
  | y :: ys -> if x = y then ys else y :: (list_remove x ys)

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let get_single_line x =
  match_lwt Lwt_stream.get x with
  | None -> return None
  | Some _ as line ->
    lwt b = Lwt_stream.is_empty x in
    if b then (
      return line
    ) else (
      Lwt_stream.junk_while (fun _ -> true) x >>
      return None
    )

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module Make (C : CONFIG) : SITE = struct
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  open Eliom_service
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  open Eliom_registration

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  let make_path x = C.path @ x

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  module Auth = Web_auth.Make (C)
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  let store = Ocsipersist.open_store C.name

  (* Persistent table, used to initialize the server. *)
  let election_ptable = Ocsipersist.open_table (C.name ^ "_elections")

  (* In-memory table, indexed by UUID, contains closures. *)
  let election_table = ref SMap.empty

  lwt main_election =
    Ocsipersist.make_persistent store "main_election" None

  lwt featured =
    Ocsipersist.make_persistent store "featured_elections" []
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  (* The following reference is there to cut a dependency loop:
     S.register_election depends on S (via Templates). It will be set
     to a proper value once we have called Templates.Make. *)
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  let import_election_ref = ref (fun _ -> assert false)
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  (* We use an intermediate module S that will be passed to Templates
     and Web_election. S is not meant to leak and will be included
     in the returned module later. *)

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  module S : SITE = struct
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    include Auth.Services
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    include Auth.Handlers
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    open Eliom_parameter

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    let scope = Eliom_common.default_session_scope

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    let home = service
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      ~path:(make_path [""])
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      ~get_params:unit
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      ()

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    let source_code = service
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      ~path:(make_path ["belenios.tar.gz"])
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      ~get_params:unit
      ()

    let get_randomness = service
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      ~path:(make_path ["get-randomness"])
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      ~get_params:unit
      ()

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    let cont = Eliom_reference.eref ~scope
      (fun () () -> Eliom_registration.Redirection.send home)
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    let import_election ~featured f = !import_election_ref featured f
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    let add_featured_election x =
      lwt the_featured = Ocsipersist.get featured in
      if List.mem x the_featured then (
        return ()
      ) else if SMap.mem x !election_table then (
        Ocsipersist.set featured (x :: the_featured)
      ) else (
        Lwt.fail Not_found
      )

    let remove_featured_election x =
      lwt the_featured = Ocsipersist.get featured in
      Ocsipersist.set featured (list_remove x the_featured)

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    let set_main_election x =
      if SMap.mem x !election_table then (
        Ocsipersist.set main_election (Some x)
      ) else (
        Lwt.fail Not_found
      )

    let unset_main_election () =
      Ocsipersist.set main_election None
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  end

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  include S

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  module T = Web_templates.Make (S)
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  let register_election params web_params =
    let module P = (val params : ELECTION_PARAMS) in
    let uuid = Uuidm.to_string P.params.e_uuid in
    let module D = struct
      module G = P.G
      let election = {
        e_params = P.params;
        e_pks = None;
        e_fingerprint = P.fingerprint;
      }
    end in
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    let module P = (val web_params : WEB_PARAMS) in
    let module R = Web_election.Make (D) (P) in
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    let module W = R.W in
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    let module X : EMPTY = R.Register (S) (T) in
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    let election = (module W : WEB_ELECTION) in
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    election_table := SMap.add uuid election !election_table;
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    return election

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  let () = import_election_ref := fun featured f ->
    lwt raw_election =
      Lwt_io.lines_of_file f.f_election |>
      get_single_line >>=
      (function
      | Some e -> return e
      | None -> Printf.ksprintf
        failwith "%s must contain a single line" f.f_election
      )
    in
    let params = Group.election_params_of_string raw_election in
    let module P = (val params : ELECTION_PARAMS) in
    let uuid = Uuidm.to_string P.params.e_uuid in
    lwt exists =
      try_lwt
        lwt _ = Ocsipersist.find election_ptable uuid in
        return true
      with Not_found -> return false
    in
    if exists then (
      return None
    ) else (
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      let ( / ) = Filename.concat in
      let dir = C.spool_dir/uuid in
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      lwt metadata =
        Lwt_io.chars_of_file f.f_metadata |>
        Lwt_stream.to_string >>=
        wrap1 metadata_of_string
      in
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      lwt () =
        Lwt_unix.mkdir dir 0o700 >>
        Lwt_io.(with_file Output (dir/"election.json") (fun oc ->
          write_line oc raw_election
        )) >>
        Lwt_io.(with_file Output (dir/"public_keys.jsons") (fun oc ->
          with_file Input f.f_public_keys (fun ic ->
            read_chars ic |> write_chars oc
          )
        ))
      in
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      let module X = struct
        let metadata = metadata
        let featured = featured
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        let dir = dir
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      end in
      let web_params = (module X : WEB_PARAMS) in
      Ocsipersist.add election_ptable uuid (raw_election, web_params) >>
      lwt election = register_election params web_params in
      let module W = (val election : WEB_ELECTION) in
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      lwt () =
        if W.featured then S.add_featured_election uuid
        else return ()
      in
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      begin try_lwt
        let () =
          Ocsigen_messages.debug (fun () ->
            Printf.sprintf "Injecting credentials for %s" uuid
          )
        in
        Lwt_io.lines_of_file f.f_public_creds |>
        Lwt_stream.iter_s W.B.inject_cred
      with Not_found ->
        return ()
      end >>
      return (Some election)
    )

  lwt () =
    Ocsipersist.iter_step (fun uuid (raw_election, web_params) ->
      let params = Group.election_params_of_string raw_election in
      lwt election = register_election params web_params in
      let module W = (val election : WEB_ELECTION) in
      assert (uuid = Uuidm.to_string W.election.e_params.e_uuid);
      Ocsigen_messages.debug (fun () ->
        Printf.sprintf "Initialized election %s from persistent store" uuid
      );
      return ()
    ) election_ptable

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  let () = let module X : EMPTY = Auth.Register (S) (T.Login (S)) in ()
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  let () = Any.register ~service:home
    (fun () () ->
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      Eliom_reference.unset cont >>
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      match_lwt Ocsipersist.get main_election with
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      | None ->
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        lwt featured =
          Ocsipersist.get featured >>=
          Lwt_list.map_p (fun x ->
            let module W = (val SMap.find x !election_table : WEB_ELECTION) in
            return (module W : WEB_ELECTION_RO)
          )
        in
        T.home ~featured () >>= Html5.send
      | Some x ->
        let module W = (val SMap.find x !election_table : WEB_ELECTION) in
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        Redirection.send W.S.home
    )

  let () = File.register
    ~service:source_code
    ~content_type:"application/x-gzip"
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    (fun () () -> return C.source_file)
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  let do_get_randomness =
    let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
      Cryptokit.Random.(pseudo_rng (string secure_rng 16))
    )) in
    let mutex = Lwt_mutex.create () in
    fun () ->
      Lwt_mutex.with_lock mutex (fun () ->
        lwt prng = Lazy.force prng in
        return Cryptokit.Random.(string prng 32)
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      )

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  let () = String.register
    ~service:get_randomness
    (fun () () ->
      lwt r = do_get_randomness () in
      Cryptokit.(transform_string (Base64.encode_compact ()) r) |>
      (fun x -> string_of_randomness { randomness=x }) |>
      (fun x -> return (x, "application/json"))
    )
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end