class Inspec::Fetcher::Local

def self.resolve(target)
  if target.is_a?(String)
    local_path = resolve_from_string(target)
    new(local_path) if local_path
  elsif target.is_a?(Hash)
    local_path = resolve_from_hash(target)
    new(local_path, target) if local_path
  end
end

def self.resolve_from_hash(target)
  return unless target.key?(:path)
  if target.key?(:cwd)
    File.expand_path(target[:path], target[:cwd])
  else
    target[:path]
  end
end

def self.resolve_from_string(target)
  # Support "urls" in the form of file://
  if target.start_with?("file://")
    target = target.gsub(%r{^file://}, "")
  else
    # support for windows paths
    target = target.tr("\\", "/")
  end
  target if File.exist?(File.expand_path(target))
end

def archive_path
  @target
end

def cache_key
  sha256.to_s
end

def fetch(path)
  # If `inspec exec` is used then we should not vendor/fetch. This makes
  # local development easier and more predictable.
  return @target if Inspec::BaseCLI.inspec_cli_command == :exec
  # Skip vendoring if @backend is not set (example: ad hoc runners)
  return @target unless @backend
  if File.directory?(@target)
    # Create an archive, checksum, and move to the vendor directory
    Dir.mktmpdir do |tmpdir|
      temp_archive = File.join(tmpdir, "#{File.basename(@target)}.tar.gz")
      opts = {
        backend: @backend,
        output: temp_archive,
      }
      # Create a temporary archive at `opts[:output]`
      Inspec::Profile.for_target(@target, opts).archive(opts)
      checksum = perform_shasum(temp_archive)
      final_path = File.join(path, checksum)
      FileUtils.mkdir_p(final_path)
      Inspec::FileProvider.for_path(temp_archive).extract(final_path)
    end
  else
    # Verify profile (archive) is valid and extract to vendor directory
    opts = { backend: @backend }
    Inspec::Profile.for_target(@target, opts).check
    Inspec::FileProvider.for_path(@target).extract(path)
  end
  @target
end

def initialize(target, opts = {})
  @target = target
  @backend = opts[:backend]
  @archive_shasum = nil
end

def perform_shasum(target)
  return @archive_shasum if @archive_shasum
  raise(Inspec::FetcherFailure, "Profile dependency local path '#{target}' does not exist") unless File.exist?(target)
  @archive_shasum = OpenSSL::Digest.digest("SHA256", File.read(target)).unpack("H*")[0]
end

def resolved_source
  h = { path: @target }
  h[:sha256] = sha256 if sha256
  h
end

def sha256
  if !@archive_shasum.nil?
    @archive_shasum
  elsif File.directory?(@target)
    nil
  else
    perform_shasum(@target)
  end
end

def writable?
  File.directory?(@target)
end