/*jshint -W051:true */
'use strict';

////////////////////////////////////////////////////////////////////////////////
/// @brief module "fs"
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2010-2013, triAGENS GmbH, Cologne, Germany
///
/// Parts of the code are based on:
///
/// Copyright Joyent, Inc. and other Node contributors.
///
/// Permission is hereby granted, free of charge, to any person obtaining a
/// copy of this software and associated documentation files (the
/// "Software"), to deal in the Software without restriction, including
/// without limitation the rights to use, copy, modify, merge, publish,
/// distribute, sublicense, and/or sell copies of the Software, and to permit
/// persons to whom the Software is furnished to do so, subject to the
/// following conditions:
///
/// The above copyright notice and this permission notice shall be included
/// in all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
/// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
/// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
/// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
/// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
/// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
/// USE OR OTHER DEALINGS IN THE SOFTWARE.
////////////////////////////////////////////////////////////////////////////////

(function () {

var exports = require("fs");
var isWindows = require("internal").platform.substr(0, 3) === 'win';

// -----------------------------------------------------------------------------
// --SECTION--                                                       Module "fs"
// -----------------------------------------------------------------------------

// -----------------------------------------------------------------------------
// --SECTION--                                                  public constants
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief pathSeparator
////////////////////////////////////////////////////////////////////////////////

exports.pathSeparator = "/";

if (global.PATH_SEPARATOR) {
  exports.pathSeparator = global.PATH_SEPARATOR;
  delete global.PATH_SEPARATOR;
}

// -----------------------------------------------------------------------------
// --SECTION--                                                 private functions
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief normalizes path parts
///
/// resolves . and .. elements in a path array with directory names there
/// must be no slashes, empty elements, or device names (c:\) in the array
/// (so also no leading and trailing slashes - it does not distinguish
/// relative and absolute paths)
////////////////////////////////////////////////////////////////////////////////

function normalizeArray (parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;

  for (var i = parts.length - 1; i >= 0; i--) {
    var last = parts[i];

    if (last === '.') {
      parts.splice(i, 1);
    }
    else if (last === '..') {
      parts.splice(i, 1);
      up++;
    }
    else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (up; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief normalizes a path string
////////////////////////////////////////////////////////////////////////////////

var splitDeviceRe =
  /^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/]+[^\\\/]+)?([\\\/])?([\s\S]*?)$/;

function normalizeUNCRoot (device) {
  return '\\\\' + device.replace(/^[\\\/]+/, '').replace(/[\\\/]+/g, '\\');
}

function normalizeWindows (path) {
  var result = splitDeviceRe.exec(path);
  var device = result[1] || '';
  var isUnc = device && device.charAt(1) !== ':';
  var isAbsolute = !!result[2] || isUnc; // UNC paths are always absolute
  var tail = result[3];
  var trailingSlash = /[\\\/]$/.test(tail);

  // If device is a drive letter, we'll normalize to lower case.
  if (device && device.charAt(1) === ':') {
    device = device[0].toLowerCase() + device.substr(1);
  }

  // Normalize the tail path
  tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {
    return !!p;
  }), !isAbsolute).join('\\');

  if (!tail && !isAbsolute) {
    tail = '.';
  }
  if (tail && trailingSlash) {
    tail += '\\';
  }

  // Convert slashes to backslashes when `device` points to an UNC root.
  // Also squash multiple slashes into a single one where appropriate.

  if (isUnc) {
    device = normalizeUNCRoot(device);
  }

  return device + (isAbsolute ? '\\' : '') + tail;
}

function normalizePosix (path) {
  var isAbsolute = path.charAt(0) === '/';
  var trailingSlash = path.substr(-1) === '/';

  // Normalize the path
  path = normalizeArray(path.split('/').filter(function(p) {
    return !!p;
  }), !isAbsolute).join('/');

  if (!path && !isAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isAbsolute ? '/' : '') + path;
}

var normalize = isWindows ? normalizeWindows : normalizePosix;

exports.normalize = normalize;

// -----------------------------------------------------------------------------
// --SECTION--                                                  public functions
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief exists
////////////////////////////////////////////////////////////////////////////////

if (global.FS_EXISTS) {
  exports.exists = global.FS_EXISTS;
  delete global.FS_EXISTS;
}


////////////////////////////////////////////////////////////////////////////////
/// @brief chmod
////////////////////////////////////////////////////////////////////////////////

if (global.FS_CHMOD) {
  exports.chmod = global.FS_CHMOD;
  delete global.FS_CHMOD;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief getTempFile
////////////////////////////////////////////////////////////////////////////////

if (global.FS_GET_TEMP_FILE) {
  exports.getTempFile = global.FS_GET_TEMP_FILE;
  delete global.FS_GET_TEMP_FILE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief getTempPath
////////////////////////////////////////////////////////////////////////////////

if (global.FS_GET_TEMP_PATH) {
  exports.getTempPath = global.FS_GET_TEMP_PATH;
  delete global.FS_GET_TEMP_PATH;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief home
////////////////////////////////////////////////////////////////////////////////

var homeDirectory = "";

if (global.HOME) {
  homeDirectory = global.HOME;
  delete global.HOME;
}

exports.home = function () {
  return homeDirectory;
};

////////////////////////////////////////////////////////////////////////////////
/// @brief isDirectory
////////////////////////////////////////////////////////////////////////////////

if (global.FS_IS_DIRECTORY) {
  exports.isDirectory = global.FS_IS_DIRECTORY;
  delete global.FS_IS_DIRECTORY;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief isFile
////////////////////////////////////////////////////////////////////////////////

if (global.FS_IS_FILE) {
  exports.isFile = global.FS_IS_FILE;
  delete global.FS_IS_FILE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief makeAbsolute
////////////////////////////////////////////////////////////////////////////////

if (global.FS_MAKE_ABSOLUTE) {
  exports.makeAbsolute = global.FS_MAKE_ABSOLUTE;
  delete global.FS_MAKE_ABSOLUTE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief join
////////////////////////////////////////////////////////////////////////////////

if (isWindows) {

  exports.join = function () {
    function f(p) {
      if (typeof p !== 'string') {
        throw new TypeError('Arguments to path.join must be strings');
      }
      return p;
    }

    var paths = Array.prototype.filter.call(arguments, f);
    var joined = paths.join('\\');

    // Make sure that the joined path doesn't start with two slashes, because
    // normalize() will mistake it for an UNC path then.
    //
    // This step is skipped when it is very clear that the user actually
    // intended to point at an UNC path. This is assumed when the first
    // non-empty string arguments starts with exactly two slashes followed by
    // at least one more non-slash character.
    //
    // Note that for normalize() to treat a path as an UNC path it needs to
    // have at least 2 components, so we don't filter for that here.
    // This means that the user can use join to construct UNC paths from
    // a server name and a share name; for example:
    //   path.join('//server', 'share') -> '\\\\server\\share\')

    if (!/^[\\\/]{2}[^\\\/]/.test(paths[0])) {
      joined = joined.replace(/^[\\\/]{2,}/, '\\');
    }

    return normalize(joined);
  };

}
else {
  exports.join = function () {
    var paths = Array.prototype.slice.call(arguments, 0);

    return normalize(paths.filter(function(p) {
      if (typeof p !== 'string') {
        throw new TypeError('Arguments to path.join must be strings - have ' + JSON.stringify(p));
      }

      return p;
    }).join('/'));
  };

}

////////////////////////////////////////////////////////////////////////////////
/// @brief safe-join
////////////////////////////////////////////////////////////////////////////////

var safeJoin;

if (isWindows) {
  safeJoin = function (base, relative) {
    base = normalize(base + "/");
    var path = normalizeArray(relative.split(/[\\\/]+/), false).join("/");

    return base + path;
  };
}
else {
  safeJoin = function (base, relative) {
    base = normalize(base + "/");
    var path = normalizeArray(relative.split("/"), false).join("/");

    return base + path;
  };
}

exports.safeJoin = function () {
  var args = Array.prototype.slice.call(arguments);
  var path = safeJoin(args.shift(), args.shift());
  while (args.length) {
    path = safeJoin(path, args.shift());
  }
  return path;
};

////////////////////////////////////////////////////////////////////////////////
/// @brief list
////////////////////////////////////////////////////////////////////////////////

if (global.FS_LIST) {
  exports.list = global.FS_LIST;
  delete global.FS_LIST;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief listTree
////////////////////////////////////////////////////////////////////////////////

if (global.FS_LIST_TREE) {
  exports.listTree = global.FS_LIST_TREE;
  delete global.FS_LIST_TREE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief makeDirectory
////////////////////////////////////////////////////////////////////////////////

if (global.FS_MAKE_DIRECTORY) {
  exports.makeDirectory = global.FS_MAKE_DIRECTORY;
  delete global.FS_MAKE_DIRECTORY;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief makeDirectoryRecursive
////////////////////////////////////////////////////////////////////////////////

if (global.FS_MAKE_DIRECTORY_RECURSIVE) {
  exports.makeDirectoryRecursive = global.FS_MAKE_DIRECTORY_RECURSIVE;
  delete global.FS_MAKE_DIRECTORY_RECURSIVE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief mtime
////////////////////////////////////////////////////////////////////////////////

if (global.FS_MTIME) {
  exports.mtime = global.FS_MTIME;
  delete global.FS_MTIME;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief copy one file
////////////////////////////////////////////////////////////////////////////////

if (global.FS_COPY_FILE) {
  exports.copyFile = global.FS_COPY_FILE;
  delete global.FS_COPY_FILE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief copy recursive
////////////////////////////////////////////////////////////////////////////////

if (global.FS_COPY_RECURSIVE) {
  exports.copyRecursive = global.FS_COPY_RECURSIVE;
  delete global.FS_COPY_RECURSIVE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief move
////////////////////////////////////////////////////////////////////////////////

if (global.FS_MOVE) {
  var move = global.FS_MOVE;
  // File system moving directories fallback function
  exports.move = function(source, target) {
    try {
      return move(source, target);
    }
    catch (x) {

      if (x.hasOwnProperty('errorNum') && 
          (x.errorNum === 2 /* errors.ERROR_SYS_ERROR.code */ )) { 
        try {
          exports.copyRecursive(source, target);
          // yes, this only works from the temporary dir
          try {
            exports.removeDirectoryRecursive(source);
          }
          catch(z){
            require("console").log("failed to remove source directory: " + z);
          }

        }
        catch (y) {
          try {
            // try to cleanup the mess we created... 
            // if it doesn't work out... oh well...
            exports.removeDirectoryRecursive(target);
          }
          catch(v){
            require("console").log("failed to clean up target directory: " + v);
          }
          throw(y);
        }
      }
      else {

        throw(x);
      }
    }
    return true;
  };
  delete global.FS_MOVE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief read
////////////////////////////////////////////////////////////////////////////////

if (global.SYS_READ) {
  exports.read = global.SYS_READ;
  delete global.SYS_READ;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief readBuffer and readFileSync
////////////////////////////////////////////////////////////////////////////////

if (global.SYS_READ_BUFFER) {
  exports.readBuffer = global.SYS_READ_BUFFER;
  delete global.SYS_READ_BUFFER;

  exports.readFileSync = function (filename, encoding) {
    if (encoding !== undefined && encoding !== null) {
      return exports.readBuffer(filename).toString(encoding);
    }
    return exports.readBuffer(filename);
  };
}

////////////////////////////////////////////////////////////////////////////////
/// @brief read64
////////////////////////////////////////////////////////////////////////////////

if (global.SYS_READ64) {
  exports.read64 = global.SYS_READ64;
  delete global.SYS_READ64;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief remove
////////////////////////////////////////////////////////////////////////////////

if (global.FS_REMOVE) {
  exports.remove = global.FS_REMOVE;
  delete global.FS_REMOVE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief removeDirectory
////////////////////////////////////////////////////////////////////////////////

if (global.FS_REMOVE_DIRECTORY) {
  exports.removeDirectory = global.FS_REMOVE_DIRECTORY;
  delete global.FS_REMOVE_DIRECTORY;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief removeDirectoryRecursive
////////////////////////////////////////////////////////////////////////////////

if (global.FS_REMOVE_RECURSIVE_DIRECTORY) {
  exports.removeDirectoryRecursive = global.FS_REMOVE_RECURSIVE_DIRECTORY;
  delete global.FS_REMOVE_RECURSIVE_DIRECTORY;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief size
////////////////////////////////////////////////////////////////////////////////

if (global.FS_FILESIZE) {
  exports.size = global.FS_FILESIZE;
  delete global.FS_FILESIZE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief unzipFile
////////////////////////////////////////////////////////////////////////////////

if (global.FS_UNZIP_FILE) {
  exports.unzipFile = global.FS_UNZIP_FILE;
  delete global.FS_UNZIP_FILE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief write
////////////////////////////////////////////////////////////////////////////////

if (global.SYS_SAVE) {
  exports.write = global.SYS_SAVE;
  delete global.SYS_SAVE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief writeFileSync (node compatibility)
////////////////////////////////////////////////////////////////////////////////

exports.writeFileSync = function (filename, content) {
  return exports.write(filename, content);
};

////////////////////////////////////////////////////////////////////////////////
/// @brief zipFile
////////////////////////////////////////////////////////////////////////////////

if (global.FS_ZIP_FILE) {
  exports.zipFile = global.FS_ZIP_FILE;
  delete global.FS_ZIP_FILE;
}

}());

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------

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