class MeasurementsController < ApplicationController
  before_action except: :index do
    raise AccessForbidden unless current_user.at_least(:active)
  end

  def index
    readouts = current_user.readouts.includes(:quantity, :unit).order(created_at: :desc)
    @measurements = readouts.group_by(&:created_at).map do |created_at, grouped|
      Measurement.new(created_at: created_at, readouts: grouped)
    end
  end

  def new
    @quantities = current_user.quantities.ordered
  end

  def create
    timestamp = Time.current
    @readouts = readout_params.map do |rp|
      r = current_user.readouts.new(rp)
      r.created_at = timestamp
      r
    end

    if @readouts.all?(&:valid?)
      Readout.transaction { @readouts.each(&:save!) }
      @measurement = Measurement.new(readouts: @readouts, created_at: timestamp)
      flash.now[:notice] = t('.success')
    else
      render :new, status: :unprocessable_entity
    end
  end

  def destroy
    @measurement = Measurement.new(id: params[:id].to_i,
                                   created_at: Time.at(params[:id].to_i))
    current_user.readouts.where(created_at: @measurement.created_at).delete_all
    @measurements_empty = current_user.readouts.empty?
    flash.now[:notice] = t('.success')
  end

  private

  def readout_params
    params.require(:readouts).map { |r| r.permit(:quantity_id, :value, :unit_id) }
  end
end