(function(Pitaya) {

  "use strict";

  var ini = require('ini');
  var glob = require('glob');
  var path = require('path');
  var fs = require('fs');

  var FS = Pitaya.FS = {};

  FS.loadAllDesktopFiles = function(rootDirs) {

    return FS.findAllDesktopFiles(rootDirs)
      .then(function(filePaths) {

        var promises = filePaths.map(function(path) {
          return FS.loadDesktopFile(path);
        });

        return Promise.all(promises)
          .then(function(desktopFiles) {
            return desktopFiles.map(function(desktop, i) {
              return {
                path: filePaths[i],
                desktop: desktop
              };
            });
          })
        ;

      })
    ;

  };

  FS.findAllDesktopFiles = function(rootDirs) {

    if(!Array.isArray(rootDirs)) {
      rootDirs = [rootDirs];
    }

    var promises = rootDirs.map(function(rootDir) {

      var globPath = path.join(rootDir, '**/*.desktop');

      return new Promise(function(resolve, reject) {
        glob(globPath, function(err, files) {
          if(err) return reject(err);
          return resolve(files);
        });
      });

    });

    return Promise.all(promises)
      .then(function(apps) {
        return uniq(flatten(apps));
      })
    ;

  };

  FS.loadDesktopFile = function(filePath) {
    return new Promise(function(resolve, reject) {
      fs.readFile(filePath, 'utf8', function(err, content) {
        if(err) return reject(err);
        try {
          var decoded = ini.decode(content);
          return resolve(decoded);
        } catch(err) {
          return reject(err);
        }
      });
    });
  };

  // Array helpers

  function flatten(arr) {
    return arr.reduce(function(result, item) {
      result = result.concat.apply(result, Array.isArray(item) ? flatten(item) : [item]);
      return result;
    }, []);
  }

  function uniq(arr) {
    return arr.reduce(function(result, item) {
      if(result.indexOf(item) === -1) {
        result.push(item);
      }
      return result;
    }, []);
  }


}(Pitaya = global.Pitaya || {}));


Pitaya.FS.loadAllDesktopFiles(['/usr/share/applications', '/home/william/.local/share/applications'])
  .then(function(apps) {
    console.log(apps[5])
  })
;