// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

var $ = require('../util/jquery');
var defineClass = require('../util/define-class');

var INFO = 'INFO';
var ERROR = 'ERROR';

function info(text) {
  return {
    type: INFO,
    text: text
  };
}

function error(text) {
  return {
    type: ERROR,
    text: text
  };
}

module.exports = {
  INFO: INFO,
  ERROR: ERROR,
  info: info,
  error: error,

  Message: defineClass({
    publics: {
      setType: function(type) {
        switch (type) {
          case INFO:
            this.$.attr('class', 'info');
            break;
          case ERROR:
            this.$.attr('class', 'error');
            break;
          default:
            throw 'Invalid message type ' + type;
        }
      },

      setText: function(text) {
        this.$.text(text);
      },

      set: function(message) {
        if (!message) {
          this.onLowerPriority();
          return;
        }

        if (typeof message === 'string') {
          message = info(message);
        }

        var self = this;

        this.setType(message.type);
        this.setText(message.text);

        if (message.promise) {
          message.promise.then(function(message) {
            self.set(message);
          }, function(err) {
            self.set(error(err));
          });
        } else {
          this.onLowerPriority();
        }
      }
    },

    constants: [ '$' ],
    events: {
      /**
       * Event raised when the message is no longer pending user action.
       */
      onLowerPriority: 'memory once'
    },

    init: function(initial) {
      this.$ = $('<li>');
      if (initial) {
        this.set(initial);
      }
    }
  })
};