discourse/lib/unread.rb

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# frozen_string_literal: true
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class Unread
# This module helps us calculate unread and new post counts
def initialize(topic, topic_user, guardian)
@guardian = guardian
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@topic = topic
@topic_user = topic_user
end
def unread_posts
return 0 if do_not_notify?(@topic_user.notification_level)
result = ((@topic_user.highest_seen_post_number || 0) - (@topic_user.last_read_post_number || 0))
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result = 0 if result < 0
result
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end
def new_posts
return 0 if @topic_user.highest_seen_post_number.blank?
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return 0 if do_not_notify?(@topic_user.notification_level)
highest_post_number = @guardian.is_staff? ? @topic.highest_staff_post_number : @topic.highest_post_number
return 0 if (@topic_user.last_read_post_number || 0) > highest_post_number
new_posts = (highest_post_number - @topic_user.highest_seen_post_number)
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new_posts = 0 if new_posts < 0
new_posts
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end
protected
def do_not_notify?(notification_level)
[TopicUser.notification_levels[:muted], TopicUser.notification_levels[:regular]].include?(notification_level)
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end
end