#-- encoding: UTF-8

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# 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.
#
# See docs/COPYRIGHT.rdoc for more details.
#++

class MessagesController < ApplicationController
  menu_item :forums
  default_search_scope :messages
  model_object Message, scope: Forum
  before_action :find_object_and_scope
  before_action :authorize, except: %i[edit update destroy]

  include AttachmentsHelper
  include PaginationHelper

  REPLIES_PER_PAGE = 100 unless const_defined?(:REPLIES_PER_PAGE)

  # Show a topic and its replies
  def show
    @topic = @message.root

    page = params[:page]
    # Find the page of the requested reply
    if params[:r] && page.nil?
      offset = @topic.children.where(["#{Message.table_name}.id < ?", params[:r].to_i]).count
      page = 1 + offset / REPLIES_PER_PAGE
    end

    @replies = @topic
               .children
               .includes(:author, :attachments, forum: :project)
               .order(created_at: :asc)
               .page(page)
               .per_page(per_page_param)

    @reply = Message.new(subject: "RE: #{@message.subject}", parent: @topic, forum: @topic.forum)
    render action: 'show', layout: !request.xhr?
  end

  # new topic
  def new
    @message = Messages::SetAttributesService
      .new(user: current_user,
           model: Message.new,
           contract_class: EmptyContract)
      .call(forum: @forum)
      .result
  end

  # Create a new topic
  def create
    call = create_message(@forum)
    @message = call.result

    if call.success?
      call_hook(:controller_messages_new_after_save, params: params, message: @message)

      redirect_to topic_path(@message)
    else
      render action: 'new'
    end
  end

  # Reply to a topic
  def reply
    @topic = @message.root

    call = create_reply(@forum, @topic)
    @reply = call.result

    if call.success?
      call_hook(:controller_messages_reply_after_save, params: params, message: @reply)
    end
    redirect_to topic_path(@topic, r: @reply)
  end

  # Edit a message
  def edit
    return render_403 unless @message.editable_by?(User.current)

    @message.attributes = permitted_params.message(@message)
  end

  # Edit a message
  def update
    # TODO: move into contract
    return render_403 unless @message.editable_by?(User.current)

    call = update_message(@message)

    if call.success?
      flash[:notice] = t(:notice_successful_update)
      @message.reload
      redirect_to topic_path(@message.root, r: (@message.parent_id && @message.id))
    else
      render action: 'edit'
    end
  end

  # Delete a messages
  def destroy
    # TODO: move into contract
    return render_403 unless @message.destroyable_by?(User.current)

    @message.destroy
    flash[:notice] = t(:notice_successful_delete)
    redirect_target = if @message.parent.nil?
                        { controller: '/forums', action: 'show', project_id: @project, id: @forum }
                      else
                        { action: 'show', id: @message.parent, r: @message }
                      end

    redirect_to redirect_target
  end

  def quote
    user = @message.author
    text = @message.content
    subject = @message.subject.gsub('"', '\"')
    subject = "RE: #{subject}" unless subject.starts_with?('RE:')
    content = "#{ll(Setting.default_language, :text_user_wrote, user)}\n> "
    content << text.to_s.strip.gsub(%r{<pre>((.|\s)*?)</pre>}m, '[...]').gsub('"', '\"').gsub(/(\r?\n|\r\n?)/, "\n> ") + "\n\n"

    respond_to do |format|
      format.json { render json: { subject: subject, content: content } }
      format.any { head :not_acceptable }
    end
  end

  private

  def update_message(message)
    Messages::UpdateService
      .new(user: current_user,
           model: message)
      .call(permitted_params.message(@project)
            .merge(attachment_params))
  end

  def create_message(forum, message_params = permitted_params.message(forum.project))
    params = message_params
               .merge(forum: forum)
               .merge(attachment_params)

    Messages::CreateService
      .new(user: current_user)
      .call(params)
  end

  def create_reply(forum, parent)
    create_message(forum, permitted_params.reply.merge(parent: parent))
  end

  def attachment_params
    attachment_params = permitted_params.attachments.to_h

    if attachment_params.any?
      { attachment_ids: attachment_params.values.map(&:values).flatten }
    else
      {}
    end
  end
end