require 'csv'

class PetitionsController < ApplicationController

  before_action :redirect_to_valid_state, only: [:index]

  before_action :do_not_cache, except: [:index, :show]

  before_action :set_cors_headers, only: [:index, :show, :count], if: :json_request?

  before_action :redirect_to_home_page_if_dissolved, only: [:new, :check, :check_results, :create]

   before_action :redirect_to_home_page_unless_opened, only: [:index, :new, :check, :check_results, :create]

  before_action :redirect_to_archived_petition_if_archived, only: [:show]

  before_action :retrieve_petitions, only: [:index]

  before_action :retrieve_petition, only: [:show, :count, :gathering_support, :moderation_info]

  before_action :build_petition_creator, only: [:check, :check_results, :new, :create]

  before_action :redirect_to_stopped_page, if: :stopped?, only: [:moderation_info, :show]

  before_action :redirect_to_gathering_support_url, if: :collecting_sponsors?, only: [:moderation_info, :show]

  before_action :redirect_to_moderation_info_url, if: :in_moderation?, only: [:gathering_support, :show]

  before_action :redirect_to_petition_url, if: :moderated?, only: [:gathering_support, :moderation_info]

  after_action :set_content_disposition, if: :csv_request?, only: [:index]

  def index

    respond_to do |format|

      format.html

      format.json

      format.csv

    end

  end

  def show

    respond_to do |format|

      format.html

      format.json

    end

  end

  def count

    respond_to do |format|

      format.json

    end

  end

  def check

    respond_to do |format|

      format.html

    end

  end

  def check_results

    respond_to do |format|

      format.html

    end

  end

  def new

    respond_to do |format|

      format.html

    end

  end

  def create

    if @new_petition.save

      redirect_to thank_you_petition_url(@new_petition)

    else

      respond_to do |format|

        format.html { render :new }

      end

    end

  end

  def gathering_support

    respond_to do |format|

      format.html

    end

  end

  def moderation_info

    respond_to do |format|

      format.html

    end

  end

  def thank_you

    respond_to do |format|

      format.html

    end

  end

  protected

  def petition_id

    params[:id].to_i

  end

  def redirect_to_home_page_if_dissolved

    redirect_to home_url if Parliament.dissolved?

  end

  def redirect_to_home_page_unless_opened

    redirect_to home_url unless Parliament.opened?

  end

  def request_format

    request.format.json? ? :json : nil

  end

  def redirect_to_archived_petition_if_archived

    if petition = Archived::Petition.find_by(id: petition_id)

      redirect_to archived_petition_url(petition_id, format: request_format) if petition.parliament.archived?

    end

  end

  def retrieve_petitions

    @petitions = Petition.visible.search(params)

  end

  def retrieve_petition

    @petition = Petition.show.find(petition_id)

  end

  def build_petition_creator

    @new_petition = PetitionCreator.new(params, request)

  end

  def redirect_to_valid_state

    if state_present? && !valid_state?

      redirect_to petitions_url(search_params(state: :all))

    end

  end

  def state_present?

    params[:state].present?

  end

  def valid_state?

    public_petition_facets.include?(params[:state].to_sym)

  end

  def search_params(overrides = {})

    params.permit(:page, :q, :state).merge(overrides)

  end

  def collecting_sponsors?

    @petition.collecting_sponsors?

  end

  def redirect_to_gathering_support_url

    redirect_to gathering_support_petition_url(@petition)

  end

  def in_moderation?

    @petition.in_moderation?

  end

  def redirect_to_moderation_info_url

    redirect_to moderation_info_petition_url(@petition)

  end

  def moderated?

    @petition.moderated?

  end

  def stopped?

    @petition.stopped?

  end

  def redirect_to_stopped_page

    redirect_to home_url

  end

  def redirect_to_petition_url

    redirect_to petition_url(@petition)

  end

  def csv_filename

    "#{@petitions.scope}-petitions.csv"

  end

  def set_content_disposition

    response.headers['Content-Disposition'] = "attachment; filename=#{csv_filename}"

  end

end