class Swagcov::Coverage

def collect_coverage
  @routes.each do |route|
    path = route.path.spec.to_s.sub(/\(\.:format\)$/, "")
    next if third_party_route?(route, path)
    if dotfile.ignore_path?(path)
      @ignored += 1
      @routes_ignored << { verb: route.verb, path: path, status: "ignored" }
      next
    end
    next if dotfile.only_path_mismatch?(path)
    @total += 1
    regex = Regexp.new("^#{path.gsub(%r{:[^/]+}, '\\{[^/]+\\}')}(\\.[^/]+)?$")
    matching_keys = docs_paths.keys.grep(regex)
    if (doc = docs_paths.dig(matching_keys.first, route.verb.downcase))
      @covered += 1
      @routes_covered << { verb: route.verb, path: path, status: doc["responses"].keys.map(&:to_s).sort.join("  ") }
    else
      @routes_not_covered << { verb: route.verb, path: path, status: "none" }
    end
  end
end

def docs_paths
  @docs_paths ||= Dir.glob(dotfile.doc_paths).reduce({}) do |acc, docspath|
    acc.merge(load_yaml(docspath))
  end
end

def final_output
  $stdout.puts
  $stdout.puts(
    format(
      "OpenAPI documentation coverage %<percentage>.2f%% (%<covered>d/%<total>d)",
      { percentage: 100.0 * @covered / @total, covered: @covered, total: @total }
    )
  )
  $stdout.puts(
    format(
      "%<total>s endpoints ignored",
      { total: @ignored.to_s.yellow }
    )
  )
  $stdout.puts(
    format(
      "%<total>s endpoints checked",
      { total: @total.to_s.blue }
    )
  )
  $stdout.puts(
    format(
      "%<covered>s endpoints covered",
      { covered: @covered.to_s.green }
    )
  )
  $stdout.puts(
    format(
      "%<missing>s endpoints missing documentation",
      { missing: (@total - @covered).to_s.red }
    )
  )
end

def initialize dotfile: Swagcov::Dotfile.new, routes: ::Rails.application.routes.routes
  @total = 0
  @covered = 0
  @ignored = 0
  @routes_not_covered = []
  @routes_covered = []
  @routes_ignored = []
  @dotfile = dotfile
  @routes = routes
end

def load_yaml docspath
  YAML.load_file(docspath)["paths"]
rescue Psych::SyntaxError
  raise BadConfigurationError, "Malinformed openapi file (#{docspath})"
end

def report
  collect_coverage
  routes_output(@routes_covered, "green")
  routes_output(@routes_ignored, "yellow")
  routes_output(@routes_not_covered, "red")
  final_output
  @total - @covered
end

def routes_output routes, status_color
  routes.each do |route|
    $stdout.puts(
      format(
        "%<verb>10s %<path>-90s %<status>s",
        { verb: route[:verb], path: route[:path], status: route[:status].send(status_color) }
      )
    )
  end
end

def third_party_route? route, path
  # https://github.com/rails/rails/blob/48f3c3e201b57a4832314b2c957a3b303e89bfea/actionpack/lib/action_dispatch/routing/inspector.rb#L105-L107
  # Skips route paths like ["/rails/info/properties", "/rails/info", "/rails/mailers"]
  route.internal ||
    # Skips routes like "/sidekiq"
    route.verb.blank? ||
    # Exclude routes that are part of the rails gem that you would not write documentation for
    # https://github.com/rails/rails/tree/main/activestorage/app/controllers/active_storage
    # https://github.com/rails/rails/tree/main/actionmailbox/app/controllers/action_mailbox
    path.include?("/active_storage/") || path.include?("/action_mailbox/")
end