class StepCommentsController < ApplicationController
  include ActionView::Helpers::TextHelper
  include InputSanitizeHelper
  include ApplicationHelper
  include Rails.application.routes.url_helpers

  before_action :load_vars

  before_action :check_view_permissions, only: [:index]
  before_action :check_add_permissions, only: [:create]
  before_action :check_edit_permissions, only: [:edit, :update]
  before_action :check_destroy_permissions, only: [:destroy]

  def index
    @comments = @step.last_comments(@last_comment_id, @per_page)

    respond_to do |format|
      format.json do
        # 'index' partial includes header and form for adding new
        # messages. 'list' partial is used for showing more
        # comments.
        partial = 'index.html.erb'
        partial = 'list.html.erb' if @last_comment_id > 0
        more_url = ''
        if @comments.count > 0
          more_url = url_for(step_step_comments_path(@step,
                                                     format: :json,
                                                     from: @comments.first.id))
        end
        render json: {
          perPage: @per_page,
          resultsNumber: @comments.length,
          moreUrl: more_url,
          html: render_to_string(partial: partial,
                                 locals: { comments: @comments,
                                           more_comments_url: more_url })
        }
      end
    end
  end

  def create
    @comment = StepComment.new(
      message: comment_params[:message],
      user: current_user,
      step: @step
    )

    respond_to do |format|
      if @comment.save

        step_comment_annotation_notification
        # Generate activity (this can only occur in module,
        # but nonetheless check if my module is not nil)
        if @protocol.in_module?
          Activity.create(
            type_of: :add_comment_to_step,
            user: current_user,
            project: @step.my_module.experiment.project,
            experiment: @step.my_module.experiment,
            my_module: @step.my_module,
            message: t(
              "activities.add_comment_to_step",
              user: current_user.full_name,
              step: @step.position + 1,
              step_name: @step.name
            )
          )
        end

        format.json {
          render json: {
            html: render_to_string(
              partial: "comment.html.erb",
              locals: {
                comment: @comment
              }
            ),
            date: @comment.created_at.strftime('%d.%m.%Y')
          },
          status: :created
        }
      else
        response.status = 400
        format.json {
          render json: {
            errors: @comment.errors.to_hash(true)
          }
        }
      end
    end
  end

  def edit
    @update_url = step_step_comment_path(@step, @comment, format: :json)
    respond_to do |format|
      format.json do
        render json: {
          html: render_to_string(
            partial: '/comments/edit.html.erb'
          )
        }
      end
    end
  end

  def update
    old_text = @comment.message
    @comment.message = comment_params[:message]
    respond_to do |format|
      format.json do
        if @comment.save

          step_comment_annotation_notification(old_text)
          # Generate activity
          if @protocol.in_module?
            Activity.create(
              type_of: :edit_step_comment,
              user: current_user,
              project: @step.my_module.experiment.project,
              experiment: @step.my_module.experiment,
              my_module: @step.my_module,
              message: t(
                'activities.edit_step_comment',
                user: current_user.full_name,
                step: @step.position + 1,
                step_name: @step.name
              )
            )
          end
          message = custom_auto_link(@comment.message)
          render json: { comment: message }, status: :ok
        else
          render json: { errors: @comment.errors.to_hash(true) },
                 status: :unprocessable_entity
        end
      end
    end
  end

  def destroy
    respond_to do |format|
      format.json do
        if @comment.destroy
          # Generate activity
          if @protocol.in_module?
            Activity.create(
              type_of: :delete_step_comment,
              user: current_user,
              project: @step.my_module.experiment.project,
              experiment: @step.my_module.experiment,
              my_module: @step.my_module,
              message: t(
                'activities.delete_step_comment',
                user: current_user.full_name,
                step: @step.position + 1,
                step_name: @step.name
              )
            )
          end
          render json: {}, status: :ok
        else
          render json: { message: I18n.t('comments.delete_error') },
                 status: :unprocessable_entity
        end
      end
    end
  end

  private

  def load_vars
    @last_comment_id = params[:from].to_i
    @per_page = Constants::COMMENTS_SEARCH_LIMIT
    @step = Step.find_by_id(params[:step_id])
    @protocol = @step.protocol

    unless @step
      render_404
    end
  end

  def check_view_permissions
    unless can_view_step_comments(@protocol)
      render_403
    end
  end

  def check_add_permissions
    unless can_add_step_comment_in_protocol(@protocol)
      render_403
    end
  end

  def check_edit_permissions
    @comment = StepComment.find_by_id(params[:id])
    render_403 unless @comment.present? &&
                      can_edit_step_comment_in_protocol(@comment)
  end

  def check_destroy_permissions
    @comment = StepComment.find_by_id(params[:id])
    render_403 unless @comment.present? &&
                      can_delete_step_comment_in_protocol(@comment)
  end

  def comment_params
    params.require(:comment).permit(:message)
  end

  def step_comment_annotation_notification(old_text = nil)
    smart_annotation_notification(
      old_text: (old_text if old_text),
      new_text: comment_params[:message],
      title: t('notifications.step_comment_annotation_title',
               step: @step.name,
               user: current_user.full_name),
      message: t('notifications.step_annotation_message_html',
                 project: link_to(@step.my_module.experiment.project.name,
                                  project_url(@step.my_module
                                                   .experiment
                                                   .project)),
                 experiment: link_to(@step.my_module.experiment.name,
                                     canvas_experiment_url(@step.my_module
                                                                .experiment)),
                 my_module: link_to(@step.my_module.name,
                                    protocols_my_module_url(
                                      @step.my_module
                                    )),
                 step: link_to(@step.name,
                               protocols_my_module_url(@step.my_module)))
    )
  end
end