(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: recent.ml,v 1.12 2006/03/28 16:24:08 rich Exp $
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_template
open Cocanwiki_date

let default_offset = 0
let default_limit = 100
let max_limit = 1000

let run r (q : cgi) dbh hostid _ _ =
  let template = get_template dbh hostid "recent.html" in

  (* Count the number of changes. *)
  let count = Option.get (
    List.hd (
      PGSQL(dbh) "select count(*) from pages where hostid = $hostid"
    )
  ) in
  let count = Int64.to_int count in

  (* Get the offset and limit specified, and adjust them so that we will
   * be displaying some changes.
   *)
  let offset =
    try int_of_string (q#param "offset") with Not_found -> default_offset in
  let limit =
    try int_of_string (q#param "limit") with Not_found -> default_limit in

  let limit =
    if limit < 1 then 1
    else if limit > max_limit then max_limit
    else limit in
  let offset =
    if offset < 0 then 0
    else if offset >= count then max 0 (count - limit)
    else offset in

  template#set "offset" (string_of_int offset);
  template#set "last" (string_of_int (min (offset + limit) count - 1));
  template#set "limit" (string_of_int limit);
  template#set "count" (string_of_int count);

  template#conditional "has_next" (offset + limit < count);
  template#set "next_offset" (string_of_int (offset + limit));
  template#conditional "has_prev" (offset > 0);
  template#set "prev_offset" (string_of_int (max 0 (offset - limit)));

  (* Get the actual changes. *)
  let rows =
    let offset = Int32.of_int offset in
    let limit = Int32.of_int limit in
    PGSQL(dbh) "nullable-results"
    "select p.id, p.url, p.url_deleted, p.title, p.last_modified_date,
            p.logged_ip, u.name
       from pages p left outer join users u on p.logged_user = u.id
      where p.hostid = $hostid
      order by p.last_modified_date desc
     offset $offset limit $limit" in

  let table =
    List.map
      (function
       | (Some version, Some url, _, Some title,
	  Some last_modified_date, logged_ip, logged_user) ->
	   let date = printable_date_time last_modified_date in
	   let has_logged_ip, logged_ip =
	     match logged_ip with
	       None -> false, ""
	     | Some ip -> true, ip in
	   let has_logged_user, logged_user =
	     match logged_user with
	       None -> false, ""
	     | Some name -> true, name in
	   [ "version", Template.VarString (Int32.to_string version);
	     "url", Template.VarString url;
	     "title", Template.VarString title;
	     "last_modified_date", Template.VarString date;
	     "has_logged_ip", Template.VarConditional has_logged_ip;
	     "logged_ip", Template.VarString logged_ip;
	     "has_logged_user", Template.VarConditional has_logged_user;
	     "logged_user", Template.VarString logged_user;
	     "is_live", Template.VarConditional true ]
       | (Some version, None, Some url, Some title,
	  Some last_modified_date, logged_ip, logged_user) ->
	   let date = printable_date_time last_modified_date in
	   let has_logged_ip, logged_ip =
	     match logged_ip with
	       None -> false, ""
	     | Some ip -> true, ip in
	   let has_logged_user, logged_user =
	     match logged_user with
	       None -> false, ""
	     | Some name -> true, name in
	   [ "version", Template.VarString (Int32.to_string version);
	     "url", Template.VarString url;
	     "title", Template.VarString title;
	     "last_modified_date", Template.VarString date;
	     "has_logged_ip", Template.VarConditional has_logged_ip;
	     "logged_ip", Template.VarString logged_ip;
	     "has_logged_user", Template.VarConditional has_logged_user;
	     "logged_user", Template.VarString logged_user;
	     "is_live", Template.VarConditional false ]
       | _ -> assert false) rows in

  template#table "recent_changes" table;

  q#template template

let () =
  register_script ~restrict:[CanEdit] run