# frozen_string_literal: true

class RequestForCommentsController < ApplicationController
  include CommonBehavior
  before_action :require_user!
  before_action :set_request_for_comment, only: %i[show mark_as_solved set_thank_you_note clear_question]
  before_action :set_study_group_grouping,
    only: %i[index my_comment_requests rfcs_with_my_comments rfcs_for_exercise]

  def authorize!
    authorize(@request_for_comments || @request_for_comment)
  end
  private :authorize!

  # GET /request_for_comments
  # GET /request_for_comments.json
  def index
    @search = RequestForComment
      .last_per_user(2)
      .with_last_activity
      .ransack(params[:q])
    @request_for_comments = @search.result
      .joins(:exercise)
      .where(exercises: {unpublished: false})
      .includes(submission: [:study_group])
      .order('created_at DESC')
      .paginate(page: params[:page], per_page: per_page_param, total_entries: @search.result.length)

    authorize!
  end

  # GET /my_request_for_comments
  def my_comment_requests
    @search = RequestForComment
      .with_last_activity
      .where(user: current_user)
      .ransack(params[:q])
    @request_for_comments = @search.result
      .order('created_at DESC')
      .paginate(page: params[:page], per_page: per_page_param)
    authorize!
    render 'index'
  end

  # GET /my_rfc_activity
  def rfcs_with_my_comments
    @search = RequestForComment
      .with_last_activity
      .joins(:comments) # we don't need to outer join here, because we know the user has commented on these
      .where(comments: {user_id: current_user.id})
      .ransack(params[:q])
    @request_for_comments = @search.result
      .order('last_comment DESC')
      .paginate(page: params[:page], per_page: per_page_param)
    authorize!
    render 'index'
  end

  # GET /exercises/:id/request_for_comments
  def rfcs_for_exercise
    exercise = Exercise.find_by(id: params[:exercise_id])
    @search = RequestForComment
      .with_last_activity
      .where(exercise_id: exercise.id)
      .ransack(params[:q])
    @request_for_comments = @search.result
      .joins(:exercise)
      .order('last_comment DESC')
      .paginate(page: params[:page], per_page: per_page_param)
    # let the exercise decide, whether its rfcs should be visible
    authorize(exercise)
    render 'index'
  end

  # GET /request_for_comments/1/mark_as_solved
  def mark_as_solved
    authorize!
    @request_for_comment.solved = true
    respond_to do |format|
      if @request_for_comment.save
        format.json { render :show, status: :ok, location: @request_for_comment }
      else
        format.json { render json: @request_for_comment.errors, status: :unprocessable_entity }
      end
    end
  end

  # POST /request_for_comments/1/set_thank_you_note
  def set_thank_you_note
    authorize!
    @request_for_comment.thank_you_note = params[:note]

    commenters = @request_for_comment.commenters
    commenters.each {|commenter| UserMailer.send_thank_you_note(@request_for_comment, commenter).deliver_now }

    respond_to do |format|
      if @request_for_comment.save
        format.json { render :show, status: :ok, location: @request_for_comment }
      else
        format.json { render json: @request_for_comment.errors, status: :unprocessable_entity }
      end
    end
  end

  # POST /request_for_comments/1/clear_question
  def clear_question
    authorize!
    update_and_respond(object: @request_for_comment, params: {question: nil})
  end

  # GET /request_for_comments/1
  # GET /request_for_comments/1.json
  def show
    authorize!
  end

  # POST /request_for_comments.json
  def create
    # Consider all requests as JSON
    request.format = 'json'
    raise Pundit::NotAuthorizedError if @embed_options[:disable_rfc]

    @request_for_comment = RequestForComment.new(request_for_comment_params)

    respond_to do |format|
      if @request_for_comment.save
        # execute the tests here and wait until they finished.
        # As the same runner is used for the score and test run, no parallelization is possible
        # A run is triggered from the frontend and does not need to be handled here.
        @request_for_comment.submission.calculate_score
        format.json { render :show, status: :created, location: @request_for_comment }
      else
        format.html { render :new }
        format.json { render json: @request_for_comment.errors, status: :unprocessable_entity }
      end
    end
    authorize!
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_request_for_comment
    @request_for_comment = RequestForComment.find_by(id: params[:id])
  end

  def request_for_comment_params
    # The study_group_id might not be present in the session (e.g. for internal users), resulting in session[:study_group_id] = nil which is intended.
    params.require(:request_for_comment).permit(:exercise_id, :file_id, :question, :requested_at, :solved, :submission_id).merge(
      user_id: current_user.id, user_type: current_user.class.name
    )
  end

  # The index page requires the grouping of the study groups
  # The study groups are grouped by the current study group and other study groups of the user
  def set_study_group_grouping
    current_study_group = StudyGroup.find_by(id: session[:study_group_id])
    my_study_groups = current_user.study_groups.reject {|group| group == current_study_group }
    @study_groups_grouping = [[t('request_for_comments.index.study_groups.current'), Array(current_study_group)],
                              [t('request_for_comments.index.study_groups.my'), my_study_groups]]
  end
end