/*!
 * Webogram v0.3.5 - messaging web application for MTProto
 * https://github.com/zhukov/webogram
 * Copyright (C) 2014 Igor Zhukov <igor.beatle@gmail.com>
 * https://github.com/zhukov/webogram/blob/master/LICENSE
 */

angular.module('izhukov.utils', [])

.provider('Storage', function () {

  this.setPrefix = function (newPrefix) {
    ConfigStorage.prefix(newPrefix);
  };

  this.$get = ['$q', function ($q) {
    var methods = {};
    angular.forEach(['get', 'set', 'remove'], function (methodName) {
      methods[methodName] = function () {
        var deferred = $q.defer(),
            args = Array.prototype.slice.call(arguments);

        args.push(function (result) {
          deferred.resolve(result);
        });
        ConfigStorage[methodName].apply(ConfigStorage, args);

        return deferred.promise;
      };
    });
    return methods;
  }];

})

.service('FileManager', function ($window, $q, $timeout) {

  $window.URL = $window.URL || $window.webkitURL;
  $window.BlobBuilder = $window.BlobBuilder || $window.WebKitBlobBuilder || $window.MozBlobBuilder;

  var blobSupported = true;

  try {
    blobConstruct([], '');
  } catch (e) {
    blobSupported = false;
  }

  function isBlobAvailable () {
    return blobSupported;
  }

  function fileCopyTo (fromFileEntry, toFileEntry) {
    return getFileWriter(toFileEntry).then(function (fileWriter) {
      return fileWriteData(fileWriter, fromFileEntry).then(function () {
        return fileWriter;
      }, function (error) {
        return $q.reject(error);
        fileWriter.truncate(0);
      });
    });
  }

  function blobConstruct (blobParts, mimeType) {
    var blob;
    try {
      blob = new Blob(blobParts, {type: mimeType});
    } catch (e) {
      var bb = new BlobBuilder;
      angular.forEach(blobParts, function(blobPart) {
        bb.append(blobPart);
      });
      blob = bb.getBlob(mimeType);
    }
    return blob;
  }

  function fileWriteData(fileWriter, bytes) {
    var deferred = $q.defer();

    fileWriter.onwriteend = function(e) {
      deferred.resolve();
    };
    fileWriter.onerror = function (e) {
      deferred.reject(e);
    };

    if (bytes.file) {
      bytes.file(function (file) {
        fileWriter.write(file);
      }, function (error) {
        deferred.reject(error);
      })
    }
    else if (bytes instanceof Blob) { // is file bytes
      fileWriter.write(bytes);
    }
    else {
      try {
        var blob = blobConstruct([bytesToArrayBuffer(bytes)]);
        fileWriter.write(blob);
      } catch (e) {
        deferred.reject(e);
      }
    }

    return deferred.promise;
  }

  function chooseSaveFile (fileName, ext, mimeType) {
    if (!$window.chrome || !chrome.fileSystem || !chrome.fileSystem.chooseEntry) {
      return $q.reject();
    };
    var deferred = $q.defer();

    chrome.fileSystem.chooseEntry({
      type: 'saveFile',
      suggestedName: fileName,
      accepts: [{
        mimeTypes: [mimeType],
        extensions: [ext]
      }]
    }, function (writableFileEntry) {
      deferred.resolve(writableFileEntry);
    });

    return deferred.promise;
  }

  function getFileWriter (fileEntry) {
    var deferred = $q.defer();

    fileEntry.createWriter(function (fileWriter) {
      deferred.resolve(fileWriter);
    }, function (error) {
      deferred.reject(error);
    });

    return deferred.promise;
  }

  function getFakeFileWriter (mimeType, saveFileCallback) {
    var blobParts = [],
        fakeFileWriter = {
          write: function (blob) {
            if (!blobSupported) {
              if (fakeFileWriter.onerror) {
                fakeFileWriter.onerror(new Error('Blob not supported by browser'));
              }
              return false;
            }
            blobParts.push(blob);
            setZeroTimeout(function () {
              if (fakeFileWriter.onwriteend) {
                fakeFileWriter.onwriteend();
              }
            });
          },
          truncate: function () {
            blobParts = [];
          },
          finalize: function () {
            var blob = blobConstruct(blobParts, mimeType);
            if (saveFileCallback) {
              saveFileCallback(blob);
            }
            return blob;
          }
        };

    return fakeFileWriter;
  };

  function getUrl (fileData, mimeType) {
    // console.log(dT(), 'get url', fileData, mimeType, fileData.toURL !== undefined, fileData instanceof Blob);
    if (fileData.toURL !== undefined) {
      return fileData.toURL(mimeType);
    }
    if (fileData instanceof Blob) {
      return URL.createObjectURL(fileData);
    }
    return 'data:' + mimeType + ';base64,' + bytesToBase64(fileData);
  }

  function downloadFile (blob, mimeType, fileName) {
    if (window.navigator && navigator.msSaveBlob !== undefined) {
      window.navigator.msSaveBlob(blob, fileName);
      return false;
    }

    var url = getUrl(blob, mimeType);

    var anchor = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
    anchor.href = url;
    anchor.target  = '_blank';
    anchor.download = fileName;
    if (anchor.dataset) {
      anchor.dataset.downloadurl = ["video/quicktime", fileName, url].join(':');
    }
    $(anchor).css({position: 'absolute', top: 1, left: 1}).appendTo('body');

    try {
      var clickEvent = document.createEvent('MouseEvents');
      clickEvent.initMouseEvent(
        'click', true, false, window, 0, 0, 0, 0, 0
        , false, false, false, false, 0, null
      );
      anchor.dispatchEvent(clickEvent);
    } catch (e) {
      console.error('Download click error', e);
      try {
        console.error('Download click error', e);
        anchor[0].click();
      } catch (e) {
        window.open(url, '_blank');
      }
    }
    $timeout(function () {
      $(anchor).remove();
    }, 100);
  }

  return {
    isAvailable: isBlobAvailable,
    copy: fileCopyTo,
    write: fileWriteData,
    getFileWriter: getFileWriter,
    getFakeFileWriter: getFakeFileWriter,
    chooseSave: chooseSaveFile,
    getUrl: getUrl,
    download: downloadFile
  };
})

.service('IdbFileStorage', function ($q, $window, FileManager) {

  $window.indexedDB = $window.indexedDB || $window.webkitIndexedDB || $window.mozIndexedDB || $window.OIndexedDB || $window.msIndexedDB;
  $window.IDBTransaction = $window.IDBTransaction || $window.webkitIDBTransaction || $window.OIDBTransaction || $window.msIDBTransaction;

  var dbName = 'cachedFiles',
      dbStoreName = 'files',
      dbVersion = 1,
      openDbPromise,
      storageIsAvailable = $window.indexedDB !== undefined && $window.IDBTransaction !== undefined;

  function isAvailable () {
    return storageIsAvailable;
  }

  function openDatabase() {
    if (openDbPromise) {
      return openDbPromise;
    }

    try {
      var request = indexedDB.open(dbName, dbVersion),
          deferred = $q.defer(),
          createObjectStore = function (db) {
            db.createObjectStore(dbStoreName);
          };
      if (!request) {
        throw new Exception();
      }
    } catch (error) {
      storageIsAvailable = false;
      return $q.reject(error);
    }

    request.onsuccess = function (event) {
      db = request.result;

      db.onerror = function (error) {
        storageIsAvailable = false;
        console.error('Error creating/accessing IndexedDB database', error);
        deferred.reject(error);
      };

      // Interim solution for Google Chrome to create an objectStore. Will be deprecated
      if (db.setVersion) {
        if (db.version != dbVersion) {
          db.setVersion(dbVersion).onsuccess = function () {
            createObjectStore(db);
            deferred.resolve(db);
          };
        }
        else {
          deferred.resolve(db);
        }
      }
      else {
        deferred.resolve(db);
      }
    };

    request.onerror = function (event) {
      storageIsAvailable = false;
      console.error('Error creating/accessing IndexedDB database', event);
      deferred.reject(event);
    }

    request.onupgradeneeded = function (event) {
      createObjectStore(event.target.result);
    };

    return openDbPromise = deferred.promise;
  };

  function saveFile (fileName, blob) {
    return openDatabase().then(function (db) {
      try {
        var deferred = $q.defer(),
            objectStore = db.transaction([dbStoreName], IDBTransaction.READ_WRITE || 'readwrite').objectStore(dbStoreName),
            request = objectStore.put(blob, fileName);
      } catch (error) {
        storageIsAvailable = false;
        return $q.reject(error);
      }

      request.onsuccess = function (event) {
        deferred.resolve(blob);
      };

      request.onerror = function (error) {
        deferred.reject(error);
      };

      return deferred.promise;
    });
  };

  function getFile (fileName) {
    return openDatabase().then(function (db) {
      var deferred = $q.defer(),
          objectStore = db.transaction([dbStoreName], IDBTransaction.READ || 'readonly').objectStore(dbStoreName),
          request = objectStore.get(fileName);

      request.onsuccess = function (event) {
        if (event.target.result === undefined) {
          deferred.reject();
        } else {
          deferred.resolve(event.target.result);
        }
      };

      request.onerror = function (error) {
        deferred.reject(error);
      };

      return deferred.promise;
    });
  }

  function getFileWriter (fileName, mimeType) {
    var fakeWriter = FileManager.getFakeFileWriter(mimeType, function (blob) {
      saveFile(fileName, blob);
    });
    return $q.when(fakeWriter);
  }

  openDatabase();

  return {
    isAvailable: isAvailable,
    saveFile: saveFile,
    getFile: getFile,
    getFileWriter: getFileWriter
  };
})


.service('TmpfsFileStorage', function ($q, $window, FileManager) {

  $window.requestFileSystem = $window.requestFileSystem || $window.webkitRequestFileSystem;

  var reqFsPromise,
      fileSystem,
      storageIsAvailable = $window.requestFileSystem !== undefined;

  function requestFS () {
    if (reqFsPromise) {
      return reqFsPromise;
    }

    if (!$window.requestFileSystem) {
      return reqFsPromise = $q.reject({type: 'FS_BROWSER_UNSUPPORTED', description: 'requestFileSystem not present'});
    }

    var deferred = $q.defer();

    $window.requestFileSystem($window.TEMPORARY, 500 * 1024 * 1024, function (fs) {
      cachedFs = fs;
      deferred.resolve();
    }, function (e) {
      storageIsAvailable = false;
      deferred.reject(e);
    });

    return reqFsPromise = deferred.promise;
  };

  function isAvailable () {
    return storageIsAvailable;
  }

  function getFile (fileName, size) {
    size = size || 1;
    return requestFS().then(function () {
      // console.log(dT(), 'get file', fileName);
      var deferred = $q.defer();
      cachedFs.root.getFile(fileName, {create: false}, function(fileEntry) {
        fileEntry.file(function(file) {
          // console.log(dT(), 'aa', file);
          if (file.size >= size) {
            deferred.resolve(fileEntry);
          } else {
            deferred.reject(new Error('FILE_NOT_FOUND'));
          }
        }, function (error) {
          console.log(dT(), 'error', error);
          deferred.reject(error);
        });
      }, function () {
        deferred.reject(new Error('FILE_NOT_FOUND'));
      });
      return deferred.promise;
    });
  }

  function saveFile (fileName, blob) {
    return getFileWriter(fileName).then(function (fileWriter) {
      return FileManager.write(fileWriter, blob).then(function () {
        return fileWriter.finalize();
      })
    });
  }

  function getFileWriter (fileName) {
    // console.log(dT(), 'get file writer', fileName);
    return requestFS().then(function () {
      var deferred = $q.defer();
      cachedFs.root.getFile(fileName, {create: true}, function (fileEntry) {
        FileManager.getFileWriter(fileEntry).then(function (fileWriter) {
          fileWriter.finalize = function () {
            return fileEntry;
          }
          deferred.resolve(fileWriter);
        }, function (error) {
          storageIsAvailable = false;
          deferred.reject(error);
        });
      }, function (error) {
        storageIsAvailable = false;
        deferred.reject(error);
      });

      return deferred.promise;
    })
  }

  requestFS();

  return {
    isAvailable: isAvailable,
    saveFile: saveFile,
    getFile: getFile,
    getFileWriter: getFileWriter
  };
})

.service('MemoryFileStorage', function ($q, FileManager) {

  var storage = {};

  function isAvailable () {
    return true;
  }

  function getFile (fileName, size) {
    if (storage[fileName]) {
      return $q.when(storage[fileName]);
    }
    return $q.reject(new Error('FILE_NOT_FOUND'));
  }

  function saveFile (fileName, blob) {
    return $q.when(storage[fileName] = blob);
  }

  function getFileWriter (fileName, mimeType) {
    var fakeWriter = FileManager.getFakeFileWriter(mimeType, function (blob) {
      saveFile(fileName, blob);
    });
    return $q.when(fakeWriter);
  }

  return {
    isAvailable: isAvailable,
    saveFile: saveFile,
    getFile: getFile,
    getFileWriter: getFileWriter
  };
})

.service('CryptoWorker', function ($timeout, $q) {

  var webWorker = false,
      naClEmbed = false,
      taskID = 0,
      awaiting = {},
      webCrypto = window.crypto && (window.crypto.subtle || window.crypto.webkitSubtle)/* || window.msCrypto && window.msCrypto.subtle*/,
      useSha1Crypto = webCrypto && webCrypto.digest !== undefined,
      finalizeTask = function (taskID, result) {
        var deferred = awaiting[taskID];
        if (deferred !== undefined) {
          // console.log(dT(), 'CW done');
          deferred.resolve(result);
          delete awaiting[taskID];
        }
      };

  if (navigator.mimeTypes['application/x-pnacl'] !== undefined) {
    var listener = $('<div id="nacl_listener"><embed id="mtproto_crypto" width="0" height="0" src="nacl/mtproto_crypto.nmf" type="application/x-pnacl" /></div>').appendTo($('body'))[0];
    listener.addEventListener('load', function (e) {
      naClEmbed = listener.firstChild;
      console.log(dT(), 'NaCl ready');
    }, true);
    listener.addEventListener('message', function (e) {
      finalizeTask(e.data.taskID, e.data.result);
    }, true);
    listener.addEventListener('error', function (e) {
      console.error('NaCl error', e);
    }, true);
  }

  if (window.Worker) {
    var tmpWorker = new Worker('js/lib/crypto_worker.js');
    tmpWorker.onmessage = function (e) {
      if (!webWorker) {
        webWorker = tmpWorker;
      } else {
        finalizeTask(e.data.taskID, e.data.result);
      }
    };
    tmpWorker.onerror = function(error) {
      console.error('CW error', error, error.stack);
      webWorker = false;
    };
  }

  function performTaskWorker (task, params, embed) {
    // console.log(dT(), 'CW start', task);
    var deferred = $q.defer();

    awaiting[taskID] = deferred;

    params.task = task;
    params.taskID = taskID;
    (embed || webWorker).postMessage(params);

    taskID++;

    return deferred.promise;
  }

  return {
    sha1Hash: function (bytes) {
      if (useSha1Crypto) {
        // We don't use buffer since typedArray.subarray(...).buffer gives the whole buffer and not sliced one. webCrypto.digest supports typed array
        var deferred = $q.defer(),
            bytesTyped = Array.isArray(bytes) ? convertToUint8Array(bytes) : bytes;
        // console.log(dT(), 'Native sha1 start');
        webCrypto.digest({name: 'SHA-1'}, bytesTyped).then(function (digest) {
          // console.log(dT(), 'Native sha1 done');
          deferred.resolve(digest);
        }, function  (e) {
          console.error('Crypto digest error', e);
          useSha1Crypto = false;
          deferred.resolve(sha1HashSync(bytes));
        });

        return deferred.promise;
      }
      return $timeout(function () {
        return sha1HashSync(bytes);
      });
    },
    aesEncrypt: function (bytes, keyBytes, ivBytes) {
      if (naClEmbed) {
        return performTaskWorker('aes-encrypt', {
          bytes: addPadding(convertToArrayBuffer(bytes)),
          keyBytes: convertToArrayBuffer(keyBytes),
          ivBytes: convertToArrayBuffer(ivBytes)
        }, naClEmbed);
      }
      return $timeout(function () {
        return convertToArrayBuffer(aesEncryptSync(bytes, keyBytes, ivBytes));
      });
    },
    aesDecrypt: function (encryptedBytes, keyBytes, ivBytes) {
      if (naClEmbed) {
        return performTaskWorker('aes-decrypt', {
          encryptedBytes: addPadding(convertToArrayBuffer(encryptedBytes)),
          keyBytes: convertToArrayBuffer(keyBytes),
          ivBytes: convertToArrayBuffer(ivBytes)
        }, naClEmbed);
      }
      return $timeout(function () {
        return convertToArrayBuffer(aesDecryptSync(encryptedBytes, keyBytes, ivBytes));
      });
    },
    factorize: function (bytes) {
      bytes = convertToByteArray(bytes);
      if (naClEmbed && bytes.length <= 8) {
        return performTaskWorker('factorize', {bytes: bytes}, naClEmbed);
      }
      if (webWorker) {
        return performTaskWorker('factorize', {bytes: bytes});
      }
      return $timeout(function () {
        return pqPrimeFactorization(bytes);
      });
    },
    modPow: function (x, y, m) {
      if (webWorker) {
        return performTaskWorker('mod-pow', {
          x: x,
          y: y,
          m: m
        });
      }
      return $timeout(function () {
        return bytesModPow(x, y, m);
      });
    },
  };
})

.service('SearchIndexManager', function () {
  var badCharsRe = /[`~!@#$%^&*()\-_=+\[\]\\|{}'";:\/?.>,<\s]+/g,
      trimRe = /^\s+|\s$/g,
      accentsReplace = {
        a: /[åáâäà]/g,
        e: /[éêëè]/g,
        i: /[íîïì]/g,
        o: /[óôöò]/g,
        u: /[úûüù]/g,
        c: /ç/g,
        ss: /ß/g
      }

  return {
    createIndex: createIndex,
    indexObject: indexObject,
    cleanSearchText: cleanSearchText,
    search: search
  };

  function createIndex () {
    return {
      shortIndexes: {},
      fullTexts: {}
    }
  }

  function cleanSearchText (text) {
    text = text.replace(badCharsRe, ' ').replace(trimRe, '').toLowerCase();

    for (var key in accentsReplace) {
      if (accentsReplace.hasOwnProperty(key)) {
        text = text.replace(accentsReplace[key], key);
      }
    }

    return text;
  }

  function indexObject (id, searchText, searchIndex) {
    if (searchIndex.fullTexts[id] !== undefined) {
      return false;
    }

    searchText = cleanSearchText(searchText);

    if (!searchText.length) {
      return false;
    }

    var shortIndexes = searchIndex.shortIndexes;

    searchIndex.fullTexts[id] = searchText;

    angular.forEach(searchText.split(' '), function(searchWord) {
      var len = Math.min(searchWord.length, 3),
          wordPart, i;
      for (i = 1; i <= len; i++) {
        wordPart = searchWord.substr(0, i);
        if (shortIndexes[wordPart] === undefined) {
          shortIndexes[wordPart] = [id];
        } else {
          shortIndexes[wordPart].push(id);
        }
      }
    });
  }

  function search (query, searchIndex) {
    var shortIndexes = searchIndex.shortIndexes,
        fullTexts = searchIndex.fullTexts;

    query = cleanSearchText(query);

    var queryWords = query.split(' '),
        foundObjs = false,
        newFoundObjs, i, j, searchText, found;

    for (i = 0; i < queryWords.length; i++) {
      newFoundObjs = shortIndexes[queryWords[i].substr(0, 3)];
      if (!newFoundObjs) {
        foundObjs = [];
        break;
      }
      if (foundObjs === false || foundObjs.length > newFoundObjs.length) {
        foundObjs = newFoundObjs;
      }
    }

    newFoundObjs = {};

    for (j = 0; j < foundObjs.length; j++) {
      found = true;
      searchText = fullTexts[foundObjs[j]];
      for (i = 0; i < queryWords.length; i++) {
        if (searchText.indexOf(queryWords[i]) == -1) {
          found = false;
          break;
        }
      }
      if (found) {
        newFoundObjs[foundObjs[j]] = true;
      }
    }

    return newFoundObjs;
  }
})

.service('ExternalResourcesManager', function ($q, $http) {
  var urlPromises = {};

  function downloadImage (url) {
    if (urlPromises[url] !== undefined) {
      return urlPromises[url];
    }

    return urlPromises[url] = $http.get(url, {responseType: 'blob', transformRequest: null})
      .then(function (response) {
        window.URL = window.URL || window.webkitURL;
        return window.URL.createObjectURL(response.data);
      });
  }

  return {
    downloadImage: downloadImage
  }
})

.service('IdleManager', function ($rootScope, $window, $timeout) {

  $rootScope.idle = {isIDLE: false};

  var toPromise, started = false;

  return {
    start: start
  };

  function start () {
    if (!started) {
      started = true;
      $($window).on('blur focus keydown mousedown touchstart', onEvent);

      setTimeout(function () {
        onEvent({type: 'blur'});
      }, 0);
    }
  }

  function onEvent (e) {
    // console.log('event', e.type);
    if (e.type == 'mousemove') {
      $($window).off('mousemove', onEvent);
    }
    var isIDLE = e.type == 'blur' || e.type == 'timeout' ? true : false;

    $timeout.cancel(toPromise);
    if (!isIDLE) {
      // console.log('update timeout');
      toPromise = $timeout(function () {
        onEvent({type: 'timeout'});
      }, 30000);
    }

    if ($rootScope.idle.isIDLE == isIDLE) {
      return;
    }

    // console.log('IDLE changed', isIDLE);
    $rootScope.$apply(function () {
      $rootScope.idle.isIDLE = isIDLE;
    });

    if (isIDLE && e.type == 'timeout') {
      $($window).on('mousemove', onEvent);
    }
  }
})

.service('AppRuntimeManager', function ($window) {

  return {
    reload: function () {
      try {
        location.reload();
      } catch (e) {};

      if ($window.chrome && chrome.runtime && chrome.runtime.reload) {
        chrome.runtime.reload();
      };
    },
    close: function () {
      try {
        $window.close();
      } catch (e) {}
    },
    focus: function () {
      if (window.navigator.mozApps && document.hidden) {
        // Get app instance and launch it to bring app to foreground
        window.navigator.mozApps.getSelf().onsuccess = function() {
          this.result.launch();
        };
      } else {
        if (window.chrome && chrome.app && chrome.app.window) {
          chrome.app.window.current().focus();
        }
        window.focus();
      }
    }
  }
})