class Fetchers::Local

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

def self.resolve_from_hash(target)
  if target.key?(:path)
    local_path = target[:path]
    if target.key?(:cwd)
      local_path = File.expand_path(local_path, target[:cwd])
    end
    local_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
  if File.exist?(target)
    target
  end
end

def archive_path
  @target
end

def cache_key
  sha256.to_s
end

def fetch(_path)
  archive_path
end

def initialize(target)
  @target = target
end

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

def sha256
  return nil if File.directory?(@target)
  @archive_shasum ||= Digest::SHA256.hexdigest File.read(@target)
end

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