// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

/**
 * Class to manipulate the window in the remote extension.
 *
 * @param {string} extensionId ID of extension to be manipulated.
 * @constructor
 */
function RemoteCall(extensionId) {
  this.extensionId_ = extensionId;
}

/**
 * Checks whether step by step tests are enabled or not.
 * @return {Promise<bool>}
 */
RemoteCall.isStepByStepEnabled = function() {
  return new Promise(function(fulfill) {
    chrome.commandLinePrivate.hasSwitch(
        'enable-file-manager-step-by-step-tests', fulfill);
  });
};

/**
 * Calls a remote test util in Files.app's extension. See: test_util.js.
 *
 * @param {string} func Function name.
 * @param {?string} appId Target window's App ID or null for functions
 *     not requiring a window.
 * @param {Array.<*>} args Array of arguments.
 * @param {function(*)=} opt_callback Callback handling the function's result.
 * @return {Promise} Promise to be fulfilled with the result of the remote
 *     utility.
 */
RemoteCall.prototype.callRemoteTestUtil =
    function(func, appId, args, opt_callback) {
  return RemoteCall.isStepByStepEnabled().then(function(stepByStep) {
    if (!stepByStep)
      return false;
    return new Promise(function(onFulfilled) {
      console.info('Executing: ' + func + ' on ' + appId + ' with args: ');
      console.info(args);
      console.info('Type step() to continue...');
      window.step = function() {
        window.step = null;
        onFulfilled(stepByStep);
      };
    });
  }).then(function(stepByStep) {
    return new Promise(function(onFulfilled) {
      chrome.runtime.sendMessage(
          this.extensionId_,
          {
            func: func,
            appId: appId,
            args: args
          },
          function(var_args) {
            if (stepByStep) {
              console.info('Returned value:');
              console.info(arguments);
            }
            if (opt_callback)
              opt_callback.apply(null, arguments);
            onFulfilled(arguments[0]);
          });
    }.bind(this));
  }.bind(this));
};

/**
 * Waits until a window having the given ID prefix appears.
 * @param {string} windowIdPrefix ID prefix of the requested window.
 * @return {Promise} promise Promise to be fulfilled with a found window's ID.
 */
RemoteCall.prototype.waitForWindow = function(windowIdPrefix) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil('getWindows', null, []).
        then(function(windows) {
      for (var id in windows) {
        if (id.indexOf(windowIdPrefix) === 0)
          return id;
      }
      return pending('Window with the prefix %s is not found.', windowIdPrefix);
    });
  }.bind(this));
};

/**
 * Closes a window and waits until the window is closed.
 *
 * @param {string} windowId ID of the window to close.
 * @return {Promise} promise Promise to be fulfilled with the result (true:
 *     success, false: failed).
 */
RemoteCall.prototype.closeWindowAndWait = function(windowId) {
  // Closes the window.
  return this.callRemoteTestUtil('closeWindow', null, [windowId]).then(
      function(result) {
        // Returns false when the closing is failed.
        if (!result)
          return false;

        return repeatUntil(function() {
          return this.callRemoteTestUtil('getWindows', null, []).then(
              function(windows) {
                for (var id in windows) {
                  if (id === windowId) {
                    // Window is still available. Continues waiting.
                    return pending('Window with the prefix %s is not found.',
                                   windowId);
                  }
                }
                // Window is not available. Closing is done successfully.
                return true;
              }
          );
        }.bind(this));
      }.bind(this)
  );
};

/**
 * Waits until the window turns to the given size.
 * @param {string} windowId Target window ID.
 * @param {number} width Requested width in pixels.
 * @param {number} height Requested height in pixels.
 */
RemoteCall.prototype.waitForWindowGeometry =
    function(windowId, width, height) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil('getWindows', null, []).
        then(function(windows) {
      if (!windows[windowId])
        return pending('Window %s is not found.', windowId);
      if (windows[windowId].outerWidth !== width ||
          windows[windowId].outerHeight !== height) {
        return pending('Expected window size is %j, but it is %j',
                       {width: width, height: height},
                       windows[windowId]);
      }
    });
  }.bind(this));
};

/**
 * Waits for the specified element appearing in the DOM.
 * @param {string} windowId Target window ID.
 * @param {string} query Query string for the element.
 * @param {string=} opt_iframeQuery Query string for the iframe containing the
 *     element.
 * @return {Promise} Promise to be fulfilled when the element appears.
 */
RemoteCall.prototype.waitForElement =
    function(windowId, query, opt_iframeQuery) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil(
        'queryAllElements',
        windowId,
        [query, opt_iframeQuery]
    ).then(function(elements) {
      if (elements.length > 0)
        return elements[0];
      else
        return pending(
            'Element %s (maybe in iframe %s) is not found.',
            query,
            opt_iframeQuery);
    });
  }.bind(this));
};

/**
 * Waits for the specified element leaving from the DOM.
 * @param {string} windowId Target window ID.
 * @param {string} query Query string for the element.
 * @param {string=} opt_iframeQuery Query string for the iframe containing the
 *     element.
 * @return {Promise} Promise to be fulfilled when the element is lost.
 */
RemoteCall.prototype.waitForElementLost =
    function(windowId, query, opt_iframeQuery) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil(
        'queryAllElements',
        windowId,
        [query, opt_iframeQuery]
    ).then(function(elements) {
      if (elements.length > 0)
        return pending('Elements %j is still exists.', elements);
      return true;
    });
  }.bind(this));
};

/**
 * Sends a fake key down event.
 * @param {string} windowId Window ID.
 * @param {string} query Query for the target element.
 * @param {string} keyIdentifer Key identifier.
 * @param {boolean} ctrlKey Control key flag.
 * @return {Promise} Promise to be fulfilled or rejected depending on the
 *     result.
 */
RemoteCall.prototype.fakeKeyDown =
    function(windowId, query, keyIdentifer, ctrlKey) {
  var resultPromise = this.callRemoteTestUtil(
      'fakeKeyDown', windowId, [query, keyIdentifer, ctrlKey]);
  return resultPromise.then(function(result) {
    if (result)
      return true;
    else
      return Promise.reject('Fail to fake key down.');
  });
};

/**
 * Class to manipulate the window in the remote extension.
 *
 * @param {string} extensionId ID of extension to be manipulated.
 * @extends {RemoteCall}
 * @constructor
 */
function RemoteCallFilesApp() {
  RemoteCall.apply(this, arguments);
}

RemoteCallFilesApp.prototype.__proto__ = RemoteCall.prototype;

/**
 * Waits for the file list turns to the given contents.
 * @param {string} windowId Target window ID.
 * @param {Array.<Array.<string>>} expected Expected contents of file list.
 * @param {{orderCheck:boolean=, ignoreLastModifiedTime:boolean=}=} opt_options
 *     Options of the comparison. If orderCheck is true, it also compares the
 *     order of files. If ignoreLastModifiedTime is true, it compares the file
 *     without its last modified time.
 * @return {Promise} Promise to be fulfilled when the file list turns to the
 *     given contents.
 */
RemoteCallFilesApp.prototype.waitForFiles =
    function(windowId, expected, opt_options) {
  var options = opt_options || {};
  return repeatUntil(function() {
    return this.callRemoteTestUtil(
        'getFileList', windowId, []).then(function(files) {
      if (!options.orderCheck) {
        files.sort();
        expected.sort();
      }
      for (var i = 0; i < Math.min(files.length, expected.length); i++) {
        if (options.ignoreFileSize) {
          files[i][1] = '';
          expected[i][1] = '';
        }
        if (options.ignoreLastModifiedTime) {
          files[i][3] = '';
          expected[i][3] = '';
        }
      }
      if (!chrome.test.checkDeepEq(expected, files)) {
        return pending('waitForFiles: expected: %j actual %j.',
                       expected,
                       files);
      }
    });
  }.bind(this));
};

/**
 * Waits until the number of files in the file list is changed from the given
 * number.
 * TODO(hirono): Remove the function.
 *
 * @param {string} windowId Target window ID.
 * @param {number} lengthBefore Number of items visible before.
 * @return {Promise} Promise to be fulfilled with the contents of files.
 */
RemoteCallFilesApp.prototype.waitForFileListChange =
    function(windowId, lengthBefore) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil(
        'getFileList', windowId, []).then(function(files) {
      files.sort();
      var notReadyRows = files.filter(function(row) {
        return row.filter(function(cell) { return cell == '...'; }).length;
      });
      if (notReadyRows.length === 0 &&
          files.length !== lengthBefore &&
          files.length !== 0) {
        return files;
      } else {
        return pending('The number of file is %d. Not changed.', lengthBefore);
      }
    });
  }.bind(this));
};

/**
 * Waits until the given taskId appears in the executed task list.
 * @param {string} windowId Target window ID.
 * @param {string} taskId Task ID to watch.
 * @return {Promise} Promise to be fulfilled when the task appears in the
 *     executed task list.
 */
RemoteCallFilesApp.prototype.waitUntilTaskExecutes =
    function(windowId, taskId) {
  return repeatUntil(function() {
    return this.callRemoteTestUtil('getExecutedTasks', windowId, []).
        then(function(executedTasks) {
          if (executedTasks.indexOf(taskId) === -1)
            return pending('Executed task is %j', executedTasks);
        });
  }.bind(this));
};

/**
 * Waits until the current directory is changed.
 * @param {string} windowId Target window ID.
 * @param {string} expectedPath Path to be changed to.
 * @return {Promise} Promise to be fulfilled when the current directory is
 *     changed to expectedPath.
 */
RemoteCallFilesApp.prototype.waitUntilCurrentDirectoryIsChanged =
    function(windowId, expectedPath) {
  return repeatUntil(function () {
    return this.callRemoteTestUtil('getBreadcrumbPath', windowId, []).then(
      function(path) {
        if(path !== expectedPath)
          return pending('Expected path is %s', expectedPath);
      });
  }.bind(this));
};