require 'rubygems/test_case'
require 'rubygems/dependency_list'

class TestGemDependencyList < Gem::TestCase

  def setup
    super

    util_clear_gems

    @deplist = Gem::DependencyList.new

    # TODO: switch to new_spec
    @a1 = util_spec 'a', '1'
    @a2 = util_spec 'a', '2'
    @a3 = util_spec 'a', '3'

    @b1 = util_spec 'b', '1' do |s| s.add_dependency 'a', '>= 1' end
    @b2 = util_spec 'b', '2' do |s| s.add_dependency 'a', '>= 1' end

    @c1 = util_spec 'c', '1' do |s| s.add_dependency 'b', '>= 1' end
    @c2 = util_spec 'c', '2'

    @d1 = util_spec 'd', '1' do |s| s.add_dependency 'c', '>= 1' end
  end

  def test_active_count
    assert_equal 0, @deplist.send(:active_count, [], {})
    assert_equal 1, @deplist.send(:active_count, [@a1], {})
    assert_equal 0, @deplist.send(:active_count, [@a1],
                                  { @a1.full_name => true })
  end

  def test_add
    assert_equal [], @deplist.dependency_order

    @deplist.add @a1, @b2

    assert_equal [@b2, @a1], @deplist.dependency_order
  end

  def test_dependency_order
    @deplist.add @a1, @b1, @c1, @d1

    order = @deplist.dependency_order

    assert_equal %w[d-1 c-1 b-1 a-1], order.map { |s| s.full_name }
  end

  def test_dependency_order_circle
    @a1.add_dependency 'c', '>= 1'
    @deplist.add @a1, @b1, @c1

    order = @deplist.dependency_order

    assert_equal %w[b-1 c-1 a-1], order.map { |s| s.full_name }
  end

  def test_dependency_order_development
    e1 = util_spec 'e', '1'
    f1 = util_spec 'f', '1'
    g1 = util_spec 'g', '1'

    @a1.add_dependency 'e'
    @a1.add_dependency 'f'
    @a1.add_dependency 'g'
    g1.add_development_dependency 'a'

    deplist = Gem::DependencyList.new true
    deplist.add @a1, e1, f1, g1

    order = deplist.dependency_order

    assert_equal %w[g-1 a-1 f-1 e-1], order.map { |s| s.full_name },
                 'development on'

    deplist2 = Gem::DependencyList.new
    deplist2.add @a1, e1, f1, g1

    order = deplist2.dependency_order

    assert_equal %w[a-1 g-1 f-1 e-1], order.map { |s| s.full_name },
                 'development off'
  end

  def test_dependency_order_diamond
    util_diamond
    e1 = util_spec 'e', '1'
    @deplist.add e1
    @a1.add_dependency 'e', '>= 1'

    order = @deplist.dependency_order

    assert_equal %w[d-1 c-2 b-1 a-2 e-1], order.map { |s| s.full_name },
                 'deps of trimmed specs not included'
  end

  def test_dependency_order_no_dependencies
    @deplist.add @a1, @c2

    order = @deplist.dependency_order

    assert_equal %w[c-2 a-1], order.map { |s| s.full_name }
  end

  def test_find_name
    @deplist.add @a1, @b2

    assert_equal "a-1", @deplist.find_name("a-1").full_name
    assert_equal "b-2", @deplist.find_name("b-2").full_name

    assert_nil @deplist.find_name("c-2")
  end

  def test_ok_eh
    util_clear_gems

    assert @deplist.ok?, 'no dependencies'

    @deplist.add @b2

    refute @deplist.ok?, 'unsatisfied dependency'

    @deplist.add @a1

    assert @deplist.ok?, 'satisfied dependency'
  end

  def test_why_not_ok_eh
    util_clear_gems

    assert_equal({},  @deplist.why_not_ok?)

    @deplist.add @b2

    exp = {
      "b" => [
              Gem::Dependency.new("a", ">= 1")
             ]
    }

    assert_equal exp, @deplist.why_not_ok?
  end

  def test_why_not_ok_eh_old_dependency
    a  = new_spec 'a', '1',
                  'b' => '~> 1.0'

    b0 = new_spec 'b', '1.0',
                  'd' => '>= 0'

    b1 = new_spec 'b', '1.1'

    util_clear_gems

    @deplist.clear

    @deplist.add a, b0, b1

    assert_equal({},  @deplist.why_not_ok?)
  end

  def test_ok_eh_mismatch
    a1 = util_spec 'a', '1'
    a2 = util_spec 'a', '2'

    b = util_spec 'b', '1' do |s| s.add_dependency 'a', '= 1' end
    c = util_spec 'c', '1' do |s| s.add_dependency 'a', '= 2' end

    d = util_spec 'd', '1' do |s|
      s.add_dependency 'b'
      s.add_dependency 'c'
    end

    @deplist.add a1, a2, b, c, d

    assert @deplist.ok?, 'this will break on require'
  end

  def test_ok_eh_redundant
    @deplist.add @a1, @a3, @b2

    @deplist.remove_by_name("a-1")

    assert @deplist.ok?
  end

  def test_ok_to_remove_eh
    @deplist.add @a1

    assert @deplist.ok_to_remove?("a-1")

    @deplist.add @b2

    refute @deplist.ok_to_remove?("a-1")

    @deplist.add @a2

    assert @deplist.ok_to_remove?("a-1")
    assert @deplist.ok_to_remove?("a-2")
    assert @deplist.ok_to_remove?("b-2")
  end

  def test_ok_to_remove_eh_after_sibling_removed
    @deplist.add @a1, @a2, @b2

    assert @deplist.ok_to_remove?("a-1")
    assert @deplist.ok_to_remove?("a-2")

    @deplist.remove_by_name("a-1")

    refute @deplist.ok_to_remove?("a-2")
  end

  def test_remove_by_name
    util_clear_gems

    @deplist.add @a1, @b2

    @deplist.remove_by_name "a-1"

    refute @deplist.ok?
  end

  def test_tsort_each_node
    util_diamond

    order = %w[a-1 a-2 b-1 c-2 d-1]

    @deplist.tsort_each_node do |node|
      assert_equal order.shift, node.full_name
    end

    assert_empty order
  end

  def test_tsort_each_child
    util_diamond

    order = %w[a-2]

    @deplist.tsort_each_child(@b1) do |node|
      assert_equal order.shift, node.full_name
    end

    assert_empty order
  end

  # d1 -> b1 -> a1
  # d1 -> c2 -> a2
  def util_diamond
    @c2.add_dependency 'a', '>= 2'
    @d1.add_dependency 'b'

    @deplist.add @a1, @a2, @b1, @c2, @d1
  end

end