(* COCANWIKI scripts.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: restore_form.ml,v 1.3 2004/09/07 14:58:34 rich Exp $
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_template
open Cocanwiki_ok
open Cocanwiki_diff

let template = get_template "restore_form.html"

let run r (q : cgi) (dbh : Dbi.connection) (hostid, _, _) _ =
  (* Parameters. *)
  let page = q#param "page" in
  let old_version = int_of_string (q#param "version") in

  template#set "page" page;
  template#set "version" (string_of_int old_version);

  (* Compute the diff between the latest version of this page and the
   * page we're wanting to restore.
   *)
  let sth = dbh#prepare_cached "select id from pages
                                 where hostid = ? and url = ?" in
  sth#execute [`Int hostid; `String page];

  let version = sth#fetch1int () in

  if version = old_version then (
    error ~back_button:true ~title:"Restoring live version"
      q "You seem to be trying to restore the live version.";
    raise CgiExit
  );

  let diff, _ = get_diff dbh hostid page ~old_version ~version () in

  (* Display the diff. *)
  template#set "diff" diff;

  q#template template

let () =
  register_script run