# frozen_string_literal: true

module TabHelper
  # Navigation link helper
  #
  # Returns an `li` element with an 'active' class if the supplied
  # controller(s) and/or action(s) are currently active. The content of the
  # element is the value passed to the block.
  #
  # options - The options hash used to determine if the element is "active" (default: {})
  #           :controller   - One or more controller names to check, use path notation when namespaced (optional).
  #           :action       - One or more action names to check (optional).
  #           :path         - A shorthand path, such as 'dashboard#index', to check (optional).
  #           :html_options - Extra options to be passed to the list element (optional).
  #           :unless       - Callable object to skip rendering the 'active' class on `li` element (optional).
  # block   - An optional block that will become the contents of the returned
  #           `li` element.
  #
  # When both :controller and :action are specified, BOTH must match in order
  # to be marked as active. When only one is given, either can match.
  #
  # Examples
  #
  #   # Assuming we're on TreeController#show
  #
  #   # Controller matches, but action doesn't
  #   nav_link(controller: [:tree, :refs], action: :edit) { "Hello" }
  #   # => '<li>Hello</li>'
  #
  #   # Controller matches
  #   nav_link(controller: [:tree, :refs]) { "Hello" }
  #   # => '<li class="active">Hello</li>'
  #
  #   # Several paths
  #   nav_link(path: ['tree#show', 'profile#show']) { "Hello" }
  #   # => '<li class="active">Hello</li>'
  #
  #   # Shorthand path
  #   nav_link(path: 'tree#show') { "Hello" }
  #   # => '<li class="active">Hello</li>'
  #
  #   # Supplying custom options for the list element
  #   nav_link(controller: :tree, html_options: {class: 'home'}) { "Hello" }
  #   # => '<li class="home active">Hello</li>'
  #
  #   # For namespaced controllers like Admin::AppearancesController#show
  #
  #   # Controller and namespace matches
  #   nav_link(controller: 'admin/appearances') { "Hello" }
  #   # => '<li class="active">Hello</li>'
  #
  #   # Controller and namespace matches but action doesn't
  #   nav_link(controller: 'admin/appearances', action: :edit) { "Hello" }
  #   # => '<li>Hello</li>'
  #
  #   # Shorthand path with namespace
  #   nav_link(path: 'admin/appearances#show') { "Hello"}
  #   # => '<li class="active">Hello</li>'
  #
  #   # Shorthand path + unless
  #   # Add `active` class when TreeController is requested, except the `index` action.
  #   nav_link(controller: 'tree', unless: -> { action_name?('index') }) { "Hello" }
  #   # => '<li class="active">Hello</li>'
  #
  #   # When `TreeController#index` is requested
  #   # => '<li>Hello</li>'
  #
  #   # Paths, controller and actions can be used at the same time
  #   nav_link(path: 'tree#show', controller: 'admin/appearances') { "Hello" }
  #
  #   nav_link(path: 'foo#bar', controller: 'tree') { "Hello" }
  #   nav_link(path: 'foo#bar', controller: 'tree', action: 'show') { "Hello" }
  #   nav_link(path: 'foo#bar', action: 'show') { "Hello" }
  #
  # Returns a list item element String
  def nav_link(options = {}, &block)
    klass = active_nav_link?(options) ? 'active' : ''

    # Add our custom class into the html_options, which may or may not exist
    # and which may or may not already have a :class key
    o = options.delete(:html_options) || {}
    o[:class] = [*o[:class], klass].join(' ')
    o[:class].strip!

    if block_given?
      content_tag(:li, capture(&block), o)
    else
      content_tag(:li, nil, o)
    end
  end

  def active_nav_link?(options)
    return false if options[:unless]&.call

    controller = options.delete(:controller)
    action = options.delete(:action)

    route_matches_paths?(options.delete(:path)) ||
      route_matches_pages?(options.delete(:page)) ||
      route_matches_controllers_and_or_actions?(controller, action)
  end

  def current_path?(path)
    c, a, _ = path.split('#')
    current_controller?(c) && current_action?(a)
  end

  def branches_tab_class
    if current_controller?(:protected_branches) ||
        current_controller?(:branches) ||
        current_page?(project_repository_path(@project))
      'active'
    end
  end

  private

  def route_matches_paths?(paths)
    Array(paths).compact.any? do |single_path|
      current_path?(single_path)
    end
  end

  def route_matches_pages?(pages)
    Array(pages).compact.any? do |single_page|
      current_page?(single_page)
    end
  end

  def route_matches_controllers_and_or_actions?(controller, action)
    if controller && action
      current_controller?(*controller) && current_action?(*action)
    else
      current_controller?(*controller) || current_action?(*action)
    end
  end
end