/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 *	 Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * 
 * The Original Code is Firetray
 *
 * The Initial Developer of the Original Code is
 * Mozilla Messaging, Ltd.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *    Chris Coulson <chris.coulson@canonical.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const Cu = Components.utils;

Cu.import("resource://gre/modules/ctypes.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");

var EXPORTED_SYMBOLS  = [ "ctypes_library", "ERROR" ];

["LOG", "WARN", "ERROR"].forEach(function(aName) {
  this.__defineGetter__(aName, function() {
    Components.utils.import("resource://gre/modules/AddonLogging.jsm");
    LogManager.getLogger("firetray", this);
    return this[aName];
  });
}, this);

function ctypes_library(name, abis, defines) {
  try {
    LOG("Loading library: " + name);
    var library;
    for each (let abi in abis) {
      let soname = "lib" + name + ".so." + abi.toString();
      LOG("Trying " + soname);
      try {
        library = ctypes.open(soname);
        this.ABI = abi;
        LOG("Successfully loaded " + soname);
        break;
      } catch(e) {
          ERROR(soname+" unfound.");
      }
    }

    this.close = function() {
      library.close();
      this.ABI = -1;
    };

    this.available = function() {
      return this.ABI != -1;
    };

    if (!library) {
      LOG("Failed to load library: " + name);
      this.ABI = -1;
      return;
    }

    var self = this;
    let lib = {
      declare: function() {
        try {
          args = [];
          args.push(arguments[0]);
          args.push(ctypes.default_abi);
          for each (let arg in Array.prototype.slice.call(arguments, 1)) {
            args.push(arg);
          }

          return library.declare.apply(library, args);
        } catch (ex) {
          ERROR("Missing symbol " + arguments[0] + " in library " + name);
          self.ABI = -1;
          return null;
        }
      },

      lazy_bind: function() {
        var args = Array.prototype.slice.call(arguments, 0);
        XPCOMUtils.defineLazyGetter(self, arguments[0], function() {
          return lib.declare.apply(lib, args);
        });
      },

      bind_now: function() {
        self[arguments[0]] = this.declare.apply(this, arguments);
      }
    };

    defines.call(this, lib);
  } catch(e) {
    ERROR(name+" definition error: "+e);
    this.ABI = -1;
  }
}