(function() {
    "use strict";
    var when = require('when'),
        keys = require('when/keys'),
        fs = require('fs'),
        path = require('path'),
        extend = function (obj, source) {
            var key;
            for (key in source) {
                if (source.hasOwnProperty(key)) {
                    obj[key] = source[key];
                }
            }
            return obj;
        },
        readDir = function (dir, options, depth) {
            depth = depth || 0;

            options = extend({
                index: true
            }, options);

            if (depth > 1) {
                return null;
            }

            var subtree = {},
                treeDeferred = when.defer(),
                treePromise = treeDeferred.promise;

            fs.readdir(dir, function (error, files) {
                if (error) {
                    return treeDeferred.reject(error);
                }

                files = files || [];

                files.forEach(function (file) {
                    var fileDeferred = when.defer(),
                        filePromise = fileDeferred.promise,
                        ext   = path.extname(file),
                        name  = path.basename(file, ext),
                        fpath = path.join(dir, file);
                    subtree[name] = filePromise;
                    fs.lstat(fpath, function (error, result) {
                        if (result.isDirectory()) {
                            fileDeferred.resolve(readDir(fpath, options, depth + 1));
                        } else {
                            fileDeferred.resolve(fpath);
                        }
                    });
                });

                return keys.all(subtree).then(function(theFiles) {
                    return treeDeferred.resolve(theFiles);
                });
            });

            return when(treePromise).then(function (prom) {
                return prom;
            });
        },
        readAll = function (dir, options, depth) {
            return when(readDir(dir, options, depth)).then(function (paths) {
                return paths;
            });
        };

    module.exports = readAll;
}());