module NutrientsHelper
  NUTRIENTS = %i[nno3 p k ca mg s na cl si fe zn b mn cu mo nnh4].freeze

  def percent_delta(measured, target)
    return 0.0 if target.to_f.zero?
    ((measured.to_f - target.to_f) / target.to_f) * 100.0
  end

  def fmt(v)
    number_with_precision(v, precision: 2, strip_insignificant_zeros: true)
  end

  def delta_badge_class(delta)
    d = delta.abs
    case d
    when d < 0 then "bg-info"
    when 0..5 then "bg-secondary"
    else "bg-warning"
    end
  end
end