/**
  A data model representing actions users have taken

  @class UserAction
  @extends Discourse.Model
  @namespace Discourse
  @module Discourse
**/

var UserActionTypes = {
  likes_given: 1,
  likes_received: 2,
  bookmarks: 3,
  topics: 4,
  posts: 5,
  replies: 6,
  mentions: 7,
  quotes: 9,
  favorites: 10,
  edits: 11,
  messages_sent: 12,
  messages_received: 13
};

var InvertedActionTypes = {};
_.each(UserActionTypes, function (k, v) {
  InvertedActionTypes[k] = v;
});

Discourse.UserAction = Discourse.Model.extend({

  /**
    Return an i18n key we will use for the description text of a user action.

    @property descriptionKey
  **/
  descriptionKey: function() {
    var action = this.get('action_type');
    if (action === null || Discourse.UserAction.TO_SHOW.indexOf(action) >= 0) {
      if (this.get('isPM')) {
        return this.get('sameUser') ? 'sent_by_you' : 'sent_by_user';
      } else {
        return this.get('sameUser') ? 'posted_by_you' : 'posted_by_user';
      }
    }

    if (this.get('topicType')) {
      return this.get('sameUser') ? 'you_posted_topic' : 'user_posted_topic';
    }

    if (this.get('postReplyType')) {
      if (this.get('reply_to_post_number')) {
        return this.get('sameUser') ? 'you_replied_to_post' : 'user_replied_to_post';
      } else {
        return this.get('sameUser') ? 'you_replied_to_topic' : 'user_replied_to_topic';
      }
    }

    if (this.get('mentionType')) {
      if (this.get('sameUser')) {
        return 'you_mentioned_user';
      } else {
        return this.get('targetUser') ? 'user_mentioned_you' : 'user_mentioned_user';
      }
    }
  }.property('action_type'),

  /**
    Returns the HTML representation of a user action's description, complete with icon.

    @property descriptionHtml
  **/
  descriptionHtml: function() {
    var descriptionKey = this.get('descriptionKey');
    if (!descriptionKey) { return; }

    var icon = this.get('isPM') ? '<i class="icon icon-envelope" title="{{i18n user.stream.private_message}}"></i>' : '';

    return new Handlebars.SafeString(icon + " " + I18n.t("user_action." + descriptionKey, {
      userUrl: this.get('userUrl'),
      replyUrl: this.get('replyUrl'),
      postUrl: this.get('postUrl'),
      topicUrl: this.get('replyUrl'),
      user: this.get('presentName'),
      post_number: '#' + this.get('reply_to_post_number'),
      user1Url: this.get('userUrl'),
      user2Url: this.get('targetUserUrl'),
      another_user: this.get('target_name')
    }));

  }.property('descriptionKey'),

  sameUser: function() {
    return this.get('username') === Discourse.User.currentProp('username');
  }.property('username'),

  targetUser: function() {
    return this.get('target_username') === Discourse.User.currentProp('username');
  }.property('target_username'),

  presentName: Em.computed.any('name', 'username'),

  targetUserUrl: Discourse.computed.url('target_username', '/users/%@'),
  usernameLower: function() {
    return this.get('username').toLowerCase();
  }.property('username'),

  userUrl: Discourse.computed.url('usernameLower', '/users/%@'),

  postUrl: function() {
    return Discourse.Utilities.postUrl(this.get('slug'), this.get('topic_id'), this.get('post_number'));
  }.property(),

  replyUrl: function() {
    return Discourse.Utilities.postUrl(this.get('slug'), this.get('topic_id'), this.get('reply_to_post_number'));
  }.property(),

  replyType: Em.computed.equal('action_type', UserActionTypes.replies),
  postType: Em.computed.equal('action_type', UserActionTypes.posts),
  topicType: Em.computed.equal('action_type', UserActionTypes.topics),
  messageSentType: Em.computed.equal('action_type', UserActionTypes.messages_sent),
  messageReceivedType: Em.computed.equal('action_type', UserActionTypes.messages_received),
  mentionType: Em.computed.equal('action_type', UserActionTypes.mentions),
  isPM: Em.computed.or('messageSentType', 'messageReceivedType'),
  postReplyType: Em.computed.or('postType', 'replyType'),

  addChild: function(action) {
    var groups = this.get("childGroups");
    if (!groups) {
      groups = {
        likes: Discourse.UserActionGroup.create({ icon: "icon-heart" }),
        stars: Discourse.UserActionGroup.create({ icon: "icon-star" }),
        edits: Discourse.UserActionGroup.create({ icon: "icon-pencil" }),
        bookmarks: Discourse.UserActionGroup.create({ icon: "icon-bookmark" })
      };
    }
    this.set("childGroups", groups);

    var bucket = (function() {
      switch (action.action_type) {
        case UserActionTypes.likes_given:
        case UserActionTypes.likes_received:
          return "likes";
        case UserActionTypes.favorites:
          return "stars";
        case UserActionTypes.edits:
          return "edits";
        case UserActionTypes.bookmarks:
          return "bookmarks";
      }
    })();
    var current = groups[bucket];
    if (current) {
      current.push(action);
    }
  },

  children: function() {
    var g = this.get("childGroups");
    var rval = [];
    if (g) {
      rval = [g.likes, g.stars, g.edits, g.bookmarks].filter(function(i) {
        return i.get("items") && i.get("items").length > 0;
      });
    }
    return rval;
  }.property("childGroups"),

  switchToActing: function() {
    this.setProperties({
      username: this.get('acting_username'),
      avatar_template: this.get('acting_avatar_template'),
      name: this.get('acting_name')
    });
  }
});

Discourse.UserAction.reopenClass({
  collapseStream: function(stream) {
    var uniq = {},
        collapsed = Em.A(),
        pos = 0;

    stream.forEach(function(item) {
      var key = "" + item.topic_id + "-" + item.post_number;
      var found = uniq[key];
      if (found === void 0) {

        var current;
        if (Discourse.UserAction.TO_COLLAPSE.indexOf(item.action_type) >= 0) {
          current = Discourse.UserAction.create(item);
          current.setProperties({action_type: null, description: null});
          item.switchToActing();
          current.addChild(item);
        } else {
          current = item;
        }
        uniq[key] = pos;
        collapsed[pos] = current;
        pos += 1;
      } else {
        if (Discourse.UserAction.TO_COLLAPSE.indexOf(item.action_type) >= 0) {
          item.switchToActing();
          collapsed[found].addChild(item);
        } else {
          collapsed[found].setProperties(item.getProperties('action_type', 'description'));
        }
      }
    });
    return collapsed;
  },

  TYPES: UserActionTypes,
  TYPES_INVERTED: InvertedActionTypes,

  TO_COLLAPSE: [UserActionTypes.likes_given,
                UserActionTypes.likes_received,
                UserActionTypes.favorites,
                UserActionTypes.edits,
                UserActionTypes.bookmarks],

  TO_SHOW: [
    UserActionTypes.likes_given,
    UserActionTypes.likes_received,
    UserActionTypes.favorites,
    UserActionTypes.edits,
    UserActionTypes.bookmarks,
    UserActionTypes.messages_sent,
    UserActionTypes.messages_received
  ]

});