# frozen_string_literal: true

module Lcms
  module Engine
    module Admin
      class ResourcePickerController < AdminController
        def index
          @resources = Resource.where(nil)

          @resources = @resources.where_subject(index_params[:subject]) if index_params[:subject].present?
          @resources = @resources.where(curriculum_type: index_params[:type]) if index_params[:type].present?
          @resources = @resources.where_grade(grade_name) if index_params[:grade].present?
          @resources = @resources.where('title ilike ?', "%#{params[:q]}%") if index_params[:q].present?

          @resources = @resources.paginate(pagination.params(strict: true)).order('resources.title asc')

          respond_to do |format|
            format.json { render json: pagination.serialize(@resources, ResourcePickerSerializer) }
          end
        end

        private

        def index_params
          @index_params ||= begin
            default_params = { type: nil, subject: nil, grade: nil, q: nil }
            expected_params = params.slice(:type, :subject, :grade, :q).symbolize_keys
            index_p = default_params.merge(expected_params)

            grade_ok = index_p[:grade].blank? || Filterbar::GRADES.include?(index_p[:grade])
            type_ok = index_p[:type].blank? || Resource.hierarchy.include?(index_p[:type].to_sym)
            subject_ok = index_p[:subject].blank? || Resource::SUBJECTS.include?(index_p[:subject])

            raise StandardError unless grade_ok && type_ok && subject_ok

            index_p
          end
        end

        def pagination
          @pagination ||= Pagination.new(params)
        end

        def grade_name
          if index_params[:grade].casecmp('K').zero?
            'kindergarten'
          elsif index_params[:grade].casecmp('PK').zero?
            'prekindergarten'
          elsif !index_params[:grade].start_with?('grade')
            "grade #{index_params[:grade]}"
          else
            index_params[:grade]
          end
        end
      end
    end
  end
end