1 files changed, 100 insertions, 0 deletions
diff --git a/app/helpers/reactions_helper.rb b/app/helpers/reactions_helper.rb
new file mode 100644
index 000000000..e02e1c9f9
--- /dev/null
+++ b/app/helpers/reactions_helper.rb
@@ -0,0 +1,100 @@
+# frozen_string_literal: true
+
+# Redmine - project management software
+# Copyright (C) 2006-  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module ReactionsHelper
+  # Maximum number of users to display in the reaction button tooltip
+  DISPLAY_REACTION_USERS_LIMIT = 10
+
+  def reaction_button(object)
+    return unless Redmine::Reaction.visible?(object, User.current)
+
+    detail = object.reaction_detail
+
+    user_reaction = detail.user_reaction
+    count = detail.reaction_count
+    visible_user_names = detail.visible_users.take(DISPLAY_REACTION_USERS_LIMIT).map(&:name)
+
+    tooltip = build_reaction_tooltip(visible_user_names, count)
+
+    if Redmine::Reaction.editable?(object, User.current)
+      if user_reaction.present?
+        reaction_button_reacted(object, user_reaction, count, tooltip)
+      else
+        reaction_button_not_reacted(object, count, tooltip)
+      end
+    else
+      reaction_button_readonly(object, count, tooltip)
+    end
+  end
+
+  def reaction_id_for(object)
+    dom_id(object, :reaction)
+  end
+
+  private
+
+  def reaction_button_reacted(object, reaction, count, tooltip)
+    reaction_button_wrapper object do
+      link_to(
+        sprite_icon('thumb-up-filled', count.nonzero?, style: :filled),
+        reaction_path(reaction, object_type: object.class.name, object_id: object),
+        remote: true, method: :delete,
+        class: ['icon', 'reaction-button', 'reacted'],
+        title: tooltip
+      )
+    end
+  end
+
+  def reaction_button_not_reacted(object, count, tooltip)
+    reaction_button_wrapper object do
+      link_to(
+        sprite_icon('thumb-up', count.nonzero?),
+        reactions_path(object_type: object.class.name, object_id: object),
+        remote: true, method: :post,
+        class: 'icon reaction-button',
+        title: tooltip
+      )
+    end
+  end
+
+  def reaction_button_readonly(object, count, tooltip)
+    reaction_button_wrapper object do
+      tag.span(class: 'icon reaction-button readonly', title: tooltip) do
+        sprite_icon('thumb-up', count.nonzero?)
+      end
+    end
+  end
+
+  def reaction_button_wrapper(object, &)
+    tag.span(class: 'reaction-button-wrapper', data: { 'reaction-button-id': reaction_id_for(object) }, &)
+  end
+
+  def build_reaction_tooltip(visible_user_names, count)
+    return if count.zero?
+
+    display_user_names = visible_user_names.dup
+    others = count - visible_user_names.size
+
+    if others.positive?
+      display_user_names << I18n.t(:reaction_text_x_other_users, count: others)
+    end
+
+    display_user_names.to_sentence(locale: I18n.locale)
+  end
+end