class JetBlack::FileHelper

def append_to_file(file_path, append_content)
  resolved_file_path = resolve_working_path(file_path)
  unless File.exist?(resolved_file_path)
    raise JetBlack::NonExistentFileError.new(file_path, resolved_file_path)
  end
  File.open(resolved_file_path, "a") do |file|
    file.write(append_content)
  end
end

def copy_fixture(source_path, destination_path)
  source_fixture_dir = JetBlack.configuration.fixture_directory
  resolved_source_path = File.expand_path(source_path, source_fixture_dir)
  resolved_destination_path = resolve_working_path(destination_path)
  resolved_destination_dir = File.dirname(resolved_destination_path)
  if source_fixture_dir.nil?
    raise Error.new("Please configure the fixture_directory")
  end
  FileUtils.mkdir_p(resolved_destination_dir)
  FileUtils.cp(resolved_source_path, resolved_destination_path)
end

def create_executable(file_path, file_content)
  resolved_file_path = resolve_working_path(file_path)
  create_file(file_path, file_content)
  FileUtils.chmod("+x", resolved_file_path)
end

def create_file(file_path, file_content)
  resolved_file_path = resolve_working_path(file_path)
  resolved_dir = File.dirname(resolved_file_path)
  FileUtils.mkdir_p(resolved_dir)
  File.write(resolved_file_path, file_content)
end

def initialize(working_directory)
  @working_directory = working_directory
end

def resolve_working_path(file_path)
  resolved_file_path = File.expand_path(file_path, working_directory)
  unless resolved_file_path.start_with?(working_directory)
    raise JetBlack::InvalidPathError.new(file_path, resolved_file_path)
  end
  resolved_file_path
end