mirror of
https://github.com/openfoodfoundation/openfoodnetwork
synced 2026-01-29 21:17:17 +00:00
75 lines
2.3 KiB
Ruby
75 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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class WeightsAndMeasures
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def initialize(variant)
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@variant = variant
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@units = UNITS
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end
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def scale_for_unit_value
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largest_unit = find_largest_unit(scales_for_variant_unit, system)
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return [nil, nil] unless largest_unit
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[largest_unit[0], largest_unit[1]["name"]]
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end
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def system
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return "custom" unless scales = scales_for_variant_unit(ignore_available_units: true)
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return "custom" unless product_scale = @variant.product.variant_unit_scale
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scales[product_scale.to_f]['system']
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end
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private
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UNITS = {
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'weight' => {
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0.001 => { 'name' => 'mg', 'system' => 'metric' },
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1.0 => { 'name' => 'g', 'system' => 'metric' },
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1000.0 => { 'name' => 'kg', 'system' => 'metric' },
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1_000_000.0 => { 'name' => 'T', 'system' => 'metric' },
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28.349523125 => { 'name' => 'oz', 'system' => 'imperial' },
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28.35 => { 'name' => 'oz', 'system' => 'imperial' },
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453.59237 => { 'name' => 'lb', 'system' => 'imperial' },
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453.6 => { 'name' => 'lb', 'system' => 'imperial' },
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},
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'volume' => {
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0.001 => { 'name' => 'mL', 'system' => 'metric' },
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0.01 => { 'name' => 'cL', 'system' => 'metric' },
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0.1 => { 'name' => 'dL', 'system' => 'metric' },
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1.0 => { 'name' => 'L', 'system' => 'metric' },
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1000.0 => { 'name' => 'kL', 'system' => 'metric' },
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4.54609 => { 'name' => 'gal', 'system' => 'imperial' },
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}
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}.freeze
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def scales_for_variant_unit(ignore_available_units: false)
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return @units[@variant.product.variant_unit] if ignore_available_units
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@units[@variant.product.variant_unit]&.reject { |_scale, unit_info|
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available_units.exclude?(unit_info['name'])
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}
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end
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# Find the largest available and compatible unit where unit_value comes
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# to >= 1 when expressed in it.
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# If there is none available where this is true, use the smallest available unit.
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def find_largest_unit(scales, product_scale_system)
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return nil unless scales
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largest_unit = scales.select { |scale, unit_info|
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unit_info['system'] == product_scale_system &&
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@variant.unit_value / scale >= 1
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}.max
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return scales.first if largest_unit.nil?
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largest_unit
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end
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def available_units
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Spree::Config.available_units.split(",")
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end
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end
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