# frozen_string_literal: true

require 'test_helper'

class FoobarTag < Liquid::Tag
  def render_to_output_buffer(_context, output)
    output << ' '
    output
  end
end

class BlankTestFileSystem
  def read_template_file(template_path)
    template_path
  end
end

class BlankTest < Minitest::Test
  include Liquid
  N = 10

  def wrap_in_for(body)
    "{% for i in (1..#{N}) %}#{body}{% endfor %}"
  end

  def wrap_in_if(body)
    "{% if true %}#{body}{% endif %}"
  end

  def wrap(body)
    wrap_in_for(body) + wrap_in_if(body)
  end

  def test_new_tags_are_not_blank_by_default
    with_custom_tag('foobar', FoobarTag) do
      assert_template_result(' ' * N, wrap_in_for('{% foobar %}'))
    end
  end

  def test_loops_are_blank
    assert_template_result('', wrap_in_for(' '))
  end

  def test_if_else_are_blank
    assert_template_result('', '{% if true %} {% elsif false %} {% else %} {% endif %}')
  end

  def test_unless_is_blank
    assert_template_result('', wrap('{% unless true %} {% endunless %}'))
  end

  def test_mark_as_blank_only_during_parsing
    assert_template_result(' ' * (N + 1), wrap(' {% if false %} this never happens, but still, this block is not blank {% endif %}'))
  end

  def test_comments_are_blank
    assert_template_result('', wrap(' {% comment %} whatever {% endcomment %} '))
  end

  def test_captures_are_blank
    assert_template_result('', wrap(' {% capture foo %} whatever {% endcapture %} '))
  end

  def test_nested_blocks_are_blank_but_only_if_all_children_are
    assert_template_result('', wrap(wrap(' ')))
    assert_template_result("\n       but this is not " * (N + 1),
                           wrap('{% if true %} {% comment %} this is blank {% endcomment %} {% endif %}
      {% if true %} but this is not {% endif %}'))
  end

  def test_assigns_are_blank
    assert_template_result('', wrap(' {% assign foo = "bar" %} '))
  end

  def test_whitespace_is_blank
    assert_template_result('', wrap(' '))
    assert_template_result('', wrap("\t"))
  end

  def test_whitespace_is_not_blank_if_other_stuff_is_present
    body = '     x '
    assert_template_result(body * (N + 1), wrap(body))
  end

  def test_increment_is_not_blank
    assert_template_result(' 0' * 2 * (N + 1), wrap('{% assign foo = 0 %} {% increment foo %} {% decrement foo %}'))
  end

  def test_cycle_is_not_blank
    assert_template_result('  ' * ((N + 1) / 2) + ' ', wrap("{% cycle ' ', ' ' %}"))
  end

  def test_raw_is_not_blank
    assert_template_result('  ' * (N + 1), wrap(' {% raw %} {% endraw %}'))
  end

  def test_include_is_blank
    Liquid::Template.file_system = BlankTestFileSystem.new
    assert_template_result 'foobar' * (N + 1), wrap("{% include 'foobar' %}")
    assert_template_result ' foobar ' * (N + 1), wrap("{% include ' foobar ' %}")
    assert_template_result '   ' * (N + 1), wrap(" {% include ' ' %} ")
  end

  def test_case_is_blank
    assert_template_result('', wrap(" {% assign foo = 'bar' %} {% case foo %} {% when 'bar' %} {% when 'whatever' %} {% else %} {% endcase %} "))
    assert_template_result('', wrap(" {% assign foo = 'else' %} {% case foo %} {% when 'bar' %} {% when 'whatever' %} {% else %} {% endcase %} "))
    assert_template_result('   x  ' * (N + 1), wrap(" {% assign foo = 'else' %} {% case foo %} {% when 'bar' %} {% when 'whatever' %} {% else %} x {% endcase %} "))
  end
end