testmycode/tmc-server

# frozen_string_literal: true

require 'student_submission_migrator'

class MigrateToOtherCourseController < ApplicationController
  def show
    @old_course = Course.find(params[:course_id])
    @to_course = Course.find(params[:id])

    authorize! :read, @to_course
    authorize! :read, current_user

    @already_migrated = already_migrated
    @extra_alert_text = get_extra_text
    return respond_with_error('Please login to continue') if current_user.guest?
    respond_with_error('This migration is not allowed') unless StudentSubmissionMigrator.new(@old_course, @to_course, current_user).migration_is_allowed
  end

  def migrate
    @old_course = Course.find(params[:course_id])
    @to_course = Course.find(params[:id])

    authorize! :read, @to_course

    if check_understanding!
      StudentSubmissionMigrator.new(@old_course, @to_course, current_user).migrate!
      flash[:notice] = 'Successfully migrated over'
      redirect_to participant_path(current_user)
    else
      flash[:alert] = 'Improper answers. Please try again'
      render :show
    end
  end

  private
    def check_understanding!
      params[:from_course_name].strip == @old_course.name &&
        params[:to_course_name].strip == @to_course.name &&
        !!params[:im_sure] &&
        !already_migrated
    end

    def already_migrated
      MigratedSubmissions.where(to_course_id: @to_course.id, original_submission_id: current_user.submissions.where(course: @old_course).pluck(:id)).any?
    end

    def get_extra_text
      allowed_migrations = SiteSetting.value(:allow_migrations_between_courses)
      return nil if allowed_migrations.nil?
      allowed_migrations.each do |allowed_pair|
        puts allowed_pair
        return allowed_pair['message'] if allowed_pair['from'] == @old_course.id && allowed_pair['to'] == @to_course.id
      end
      nil
    end
end