class Dashboard::SuccessfulSupportsController < Dashboard::BaseController
  include Dashboard::ExpectsDateRange

  def index
    authorize! :dashboard, proposal
    render json: accumulated_grouped_supports
  end

  private

  def accumulated_grouped_supports
    grouped_votes = grouped_supports
    grouped_votes.each do |group, votes|
      grouped_votes[group] = votes.inject(0) { |sum, vote| sum + vote.vote_weight }
    end

    accumulated = 0
    grouped_votes.each do |k, v|
      accumulated += v
      grouped_votes[k] = accumulated
    end

    grouped_votes
  end

  def grouped_supports
    if params[:group_by] == 'week'
      return supports.group_by { |v| "#{v.voted_at.to_date.cweek}/#{v.voted_at.to_date.year}" }
    end

    if params[:group_by] == 'month'
      return supports.group_by { |v| "#{v.voted_at.to_date.year}-#{v.voted_at.to_date.month}" }
    end

    supports.group_by { |v| v.voted_at.to_date }
  end

  def supports
    return [] if successful_proposal.nil?

    Vote
      .select("created_at + interval '#{days_diff} day' voted_at, *")
      .where(votable: successful_proposal)
      .where("created_at + interval '#{days_diff} day' between ? and ?", start_date.beginning_of_day, end_date.end_of_day)
      .order(created_at: :asc)
  end

  def successful_proposal
    @successful_proposal ||= Proposal.find_by(id: Setting['proposals.successful_proposal_id'])
  end

  def days_diff
    return 0 if successful_proposal.nil?
    return 0 if proposal.published_at.nil?

    (proposal.published_at.to_date - successful_proposal.published_at.to_date).to_i
  end
end