/**
 * @providesModule CodePush
 * @flow
 */

'use strict';

var NativeCodePush = require('react-native').NativeModules.CodePush;
var requestFetchAdapter = require("./request-fetch-adapter.js");
var Sdk = require("code-push/script/acquisition-sdk").AcquisitionManager;

// This function is only used for tests. Replaces the default SDK, configuration and native bridge
function setUpTestDependencies(testSdk, testConfiguration, testNativeBridge){
  if (testSdk) sdk = testSdk;
  if (testConfiguration) config = testConfiguration;
  if (testNativeBridge) NativeCodePush = testNativeBridge;
}

var getConfiguration = (() => {
  var config;
  return function getConfiguration() {
    if (config) {
      return Promise.resolve(config);
    } else {
      return NativeCodePush.getConfiguration()
        .then((configuration) => {
          if (!config) config = configuration;
          return config;
        });
    }
  }
})();

var getSdk = (() => {
  var sdk;
  return function getSdk() {
    if (sdk) {
      return Promise.resolve(sdk);
    } else {
      return getConfiguration()
        .then((configuration) => {
          sdk = new Sdk(requestFetchAdapter, configuration);
          return sdk;
        });
    }
  }
})();

function checkForUpdate(callback) {
  var config;
  var sdk;
  return getConfiguration()
    .then((configResult) => {
      config = configResult;
      return getSdk();
    })
    .then((sdkResult) => {
      sdk = sdkResult;
      return getCurrentPackage();
    })
    .then((localPackage) => {
      var queryPackage = {appVersion: config.appVersion};
      if (localPackage && localPackage.appVersion === config.appVersion) {
        queryPackage = localPackage;
      } else if (err) {
        console.log(err);
      }

      sdk.queryUpdateWithCurrentPackage(queryPackage, callback);
    });
}

function download(updatePackage) {
  // Use the downloaded package info. Native code will save the package info
  // so that the client knows what the current package version is.
  return NativeCodePush.downloadUpdate(updatePackage);
}

function apply(updatePackage) {
  return NativeCodePush.applyUpdate(updatePackage);
}

function getCurrentPackage() {
  return NativeCodePush.getCurrentPackage();
}

var CodePush = {
  getConfiguration: getConfiguration,
  checkForUpdate: checkForUpdate,
  download: download,
  apply: apply,
  getCurrentPackage: getCurrentPackage,
  setUpTestDependencies: setUpTestDependencies
};

module.exports = CodePush;