require 'test_helper'

class ShipmentPackerTest < Minitest::Test
  def setup
    @dimensions = [5.1, 15.2, 30.5]
  end

  def test_pack_divide_order_into_a_single_package
    items = [{ grams: 1, quantity: 1, price: 1.0 }]

    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')
    assert_equal 1, packages.size

    package = packages.first
    assert_equal 1, package.weight
  end

  def test_divide_order_with_multiple_lines_into_a_single_package
    items = [{ grams: 1, quantity: 2, price: 1.0 }]

    packages = ShipmentPacker.pack(items, @dimensions, 2, 'USD')
    assert_equal 1, packages.size

    package = packages.first
    assert_equal 2, package.weight
  end

  def test_divide_order_with_single_line_into_two_packages
    items = [{ grams: 1, quantity: 2, price: 1.0 }]

    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')
    assert_equal 2, packages.size

    packages.each do |package|
      assert_equal 1, package.weight
    end
  end

  def test_divide_order_with_single_line_into_two_packages_max_weight_as_float
    max_weight = 68038.8555

    items = [{ grams: 45359, quantity: 2, price: 1.0 }]

    packages = ShipmentPacker.pack(items, @dimensions, max_weight, 'USD')
    assert_equal 2, packages.size

    packages.each do |package|
      assert_equal 45359, package.weight
    end
  end

  def test_divide_order_with_multiple_lines_into_two_packages
    items = [
      { grams: 1, quantity: 1, price: 1.0 },
      { grams: 1, quantity: 1, price: 1.0 }
    ]

    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')
    assert_equal 2, packages.size

    packages.each do |package|
      assert_equal 1, package.weight
    end
  end

  def test_divide_order_into_two_packages_mixing_line_items
    items = [
      { grams: 1, quantity: 1, price: 1.0 },
      { grams: 1, quantity: 1, price: 1.0 },
      { grams: 1, quantity: 1, price: 1.0 }
    ]

    packages = ShipmentPacker.pack(items, @dimensions, 2, 'USD')
    assert_equal 2, packages.size

    assert_equal 2, packages[0].weight
    assert_equal 1, packages[1].weight
  end

  def test_raise_overweight_exception_when_a_single_item_exceeds_the_maximum_weight_of_a_package
    assert_raises(ShipmentPacker::OverweightItem) do
      items = [{ grams: 2, quantity: 1, price: 1.0 }]
      ShipmentPacker.pack(items, @dimensions, 1, 'USD')
    end
  end

  def test_raise_over_weight_exceptions_before_over_package_limit_exceptions
    assert_raises(ShipmentPacker::OverweightItem) do
      items = [{ grams: 5, quantity: ShipmentPacker::EXCESS_PACKAGE_QUANTITY_THRESHOLD + 1, price: 1.0 }]
      ShipmentPacker.pack(items, @dimensions, 4, 'USD')
    end
  end

  def test_returns_an_empty_list_when_no_items_provided
    assert_equal [], ShipmentPacker.pack([], @dimensions, 1, 'USD')
  end

  def test_add_summarized_prices_for_all_items_and_currency_to_package
    items = [
      { grams: 1, quantity: 3, price: 1.0 },
      { grams: 2, quantity: 1, price: 2.0 }
    ]
    packages = ShipmentPacker.pack(items, @dimensions, 5, 'USD')
    assert_equal 1, packages.size
    assert_equal 500, packages.first.value
    assert_equal 'USD', packages.first.currency
  end

  def test_divide_items_and_prices_accordingly_when_splitting_into_two_packages
    items = [
      { grams: 1, quantity: 1, price: 1.0 },
      { grams: 1, quantity: 1, price: 1.0 },
      { grams: 1, quantity: 1, price: 1.0 }
    ]

    packages = ShipmentPacker.pack(items, @dimensions, 2, 'USD')
    assert_equal 2, packages.size

    assert_equal 200, packages[0].value
    assert_equal 100, packages[1].value
    assert_equal 'USD', packages[0].currency
    assert_equal 'USD', packages[1].currency
  end

  def test_symbolize_item_keys
    string_key_items          = [{ 'grams' => 1, 'quantity' => 1, 'price' => 1.0 }]
    indifferent_access_items  = [{ 'grams' => 1, 'quantity' => 1, 'price' => 1.0 }.with_indifferent_access]

    [string_key_items, indifferent_access_items].each do |items|
      packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')
      assert_equal 1, packages.size

      package = packages.first
      assert_equal 1, package.weight
      assert_equal 100, package.value
    end
  end

  def test_cast_quantity_and_grams_to_int
    items = [{ grams: '1', quantity: '1', price: '1.0' }]

    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')

    package = packages.first
    assert_equal 1, package.weight
    assert_equal 100, package.value
  end

  def test_excess_packages_raised_over_threshold_before_packing_begins
    ActiveShipping::Package.expects(:new).never
    items = [{ grams: 1, quantity: ShipmentPacker::EXCESS_PACKAGE_QUANTITY_THRESHOLD + 1, price: 1.0 }]

    assert_raises(ShipmentPacker::ExcessPackageQuantity) do
      ShipmentPacker.pack(items, @dimensions, 1, 'USD')
    end
  end

  def test_excess_packages_not_raised_at_threshold
    items = [{ grams: 1, quantity: ShipmentPacker::EXCESS_PACKAGE_QUANTITY_THRESHOLD, price: 1.0 }]
    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')

    assert_predicate packages, :present?
  end

  def test_excess_packages_not_raised_below_threshold
    items = [{ grams: 1, quantity: ShipmentPacker::EXCESS_PACKAGE_QUANTITY_THRESHOLD - 1, price: 1.0 }]
    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')

    assert_predicate packages, :present?
  end

  def test_excess_packages_with_slightly_larger_max_weight_than_item_weight
    max_weight = 750
    items = [{ grams: 500, quantity: ShipmentPacker::EXCESS_PACKAGE_QUANTITY_THRESHOLD + 1, price: 1.0 }]

    assert_raises(ShipmentPacker::ExcessPackageQuantity) do
      ShipmentPacker.pack(items, @dimensions, max_weight, 'USD')
    end
  end

  def test_lots_of_zero_weight_items
    items = [{ grams: 0, quantity: 1_000_000, price: 1.0 }]
    packages = ShipmentPacker.pack(items, @dimensions, 1, 'USD')

    assert_equal 1, packages.size
    assert_equal 0, packages[0].grams
    assert_equal 100_000_000, packages[0].value
  end

  def test_dont_destroy_input_items
    items = [{ grams: 1, quantity: 5, price: 1.0 }]

    packages = ShipmentPacker.pack(items, @dimensions, 10, 'USD')

    assert_equal 1, items.size
    assert_equal 1, packages.size
  end

  def test_dont_modify_input_item_quantities
    items = [{ grams: 1, quantity: 5, price: 1.0 }]

    ShipmentPacker.pack(items, @dimensions, 10, 'USD')
    assert_equal 5, items.first[:quantity]
  end

  def test_items_with_negative_weight
    items = [{ grams: -1, quantity: 5, price: 1.0 }]

    ShipmentPacker.pack(items, @dimensions, 10, 'USD')
    assert_equal 5, items.first[:quantity]
  end
end