/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

module.metadata = {
  "stability": "stable"
};

const { Cc, Ci, Cr } = require("chrome");
const apiUtils = require("./deprecated/api-utils");
const { isString, isUndefined, instanceOf } = require('./lang/type');
const { URL, isLocalURL } = require('./url');
const { data } = require('./self');

const NOTIFICATION_DIRECTIONS  = ["auto", "ltr", "rtl"];

try {
  let alertServ = Cc["@mozilla.org/alerts-service;1"].
                  getService(Ci.nsIAlertsService);

  // The unit test sets this to a mock notification function.
  var notify = alertServ.showAlertNotification.bind(alertServ);
}
catch (err) {
  // An exception will be thrown if the platform doesn't provide an alert
  // service, e.g., if Growl is not installed on OS X.  In that case, use a
  // mock notification function that just logs to the console.
  notify = notifyUsingConsole;
}

exports.notify = function notifications_notify(options) {
  let valOpts = validateOptions(options);
  let clickObserver = !valOpts.onClick ? null : {
    observe: (subject, topic, data) => {
      if (topic === "alertclickcallback") {
        try {
          valOpts.onClick.call(exports, valOpts.data);
        }
        catch(e) {
          console.exception(e);
        }
      }
    }
  };
  function notifyWithOpts(notifyFn) {
    let { iconURL } = valOpts;
    iconURL = iconURL && isLocalURL(iconURL) ? data.url(iconURL) : iconURL;

    notifyFn(iconURL, valOpts.title, valOpts.text, !!clickObserver,
             valOpts.data, clickObserver, valOpts.tag, valOpts.dir, valOpts.lang);
  }
  try {
    notifyWithOpts(notify);
  }
  catch (err) {
    if (err instanceof Ci.nsIException && err.result == Cr.NS_ERROR_FILE_NOT_FOUND) {
      console.warn("The notification icon named by " + iconURL +
                   " does not exist.  A default icon will be used instead.");
      delete valOpts.iconURL;
      notifyWithOpts(notify);
    }
    else {
      notifyWithOpts(notifyUsingConsole);
    }
  }
};

function notifyUsingConsole(iconURL, title, text) {
  title = title ? "[" + title + "]" : "";
  text = text || "";
  let str = [title, text].filter(s => s).join(" ");
  console.log(str);
}

function validateOptions(options) {
  return apiUtils.validateOptions(options, {
    data: {
      is: ["string", "undefined"]
    },
    iconURL: {
      is: ["string", "undefined", "object"],
      ok: function(value) {
        return isUndefined(value) || isString(value) || (value instanceof URL);
      },
      msg: "`iconURL` must be a string or an URL instance."
    },
    onClick: {
      is: ["function", "undefined"]
    },
    text: {
      is: ["string", "undefined", "number"]
    },
    title: {
      is: ["string", "undefined", "number"]
    },
    tag: {
      is: ["string", "undefined", "number"]
    },
    dir: {
      is: ["string", "undefined"],
      ok: function(value) {
        return isUndefined(value) || ~NOTIFICATION_DIRECTIONS.indexOf(value);
      },
      msg: '`dir` option must be one of: "auto", "ltr" or "rtl".'
    },
    lang: {
      is: ["string", "undefined"]
    }
  });
}