class Sprockets::ProcessedAsset

def build_dependency_paths(environment, context)
  dependency_paths = {}
  context._dependency_paths.each do |path|
    dep = DependencyFile.new(path, environment.stat(path).mtime, environment.file_digest(path).hexdigest)
    dependency_paths[dep] = true
  end
  context._dependency_assets.each do |path|
    if path == self.pathname.to_s
      dep = DependencyFile.new(pathname, environment.stat(path).mtime, environment.file_digest(path).hexdigest)
      dependency_paths[dep] = true
    elsif asset = environment.find_asset(path, :bundle => false)
      asset.dependency_paths.each do |d|
        dependency_paths[d] = true
      end
    end
  end
  @dependency_paths = dependency_paths.keys
end

def build_required_assets(environment, context)
  @required_assets = resolve_dependencies(environment, context._required_paths + [pathname.to_s]) -
    resolve_dependencies(environment, context._stubbed_assets.to_a)
end

def compute_dependency_digest(environment)
  required_assets.inject(environment.digest) { |digest, asset|
    digest.update asset.digest
  }.hexdigest
end

def encode_with(coder)
  super
  coder['source'] = source
  coder['dependency_digest'] = dependency_digest
  coder['required_paths'] = required_assets.map { |a|
    relativize_root_path(a.pathname).to_s
  }
  coder['dependency_paths'] = dependency_paths.map { |d|
    { 'path' => relativize_root_path(d.pathname).to_s,
      'mtime' => d.mtime.iso8601,
      'digest' => d.digest }
  }
end

def fresh?(environment)
  # Check freshness of all declared dependencies
  @dependency_paths.all? { |dep| dependency_fresh?(environment, dep) }
end

def init_with(environment, coder)
  super
  @source = coder['source']
  @dependency_digest = coder['dependency_digest']
  @required_assets = coder['required_paths'].map { |p|
    p = expand_root_path(p)
    unless environment.paths.detect { |path| p[path] }
      raise UnserializeError, "#{p} isn't in paths"
    end
    p == pathname.to_s ? self : environment.find_asset(p, :bundle => false)
  }
  @dependency_paths = coder['dependency_paths'].map { |h|
    DependencyFile.new(expand_root_path(h['path']), h['mtime'], h['digest'])
  }
end

def initialize(environment, logical_path, pathname)
  super
  start_time = Time.now.to_f
  context = environment.context_class.new(environment, logical_path, pathname)
  @source = context.evaluate(pathname)
  @length = Rack::Utils.bytesize(source)
  @digest = environment.digest.update(source).hexdigest
  build_required_assets(environment, context)
  build_dependency_paths(environment, context)
  @dependency_digest = compute_dependency_digest(environment)
  elapsed_time = ((Time.now.to_f - start_time) * 1000).to_i
  environment.logger.debug "Compiled #{logical_path}  (#{elapsed_time}ms)  (pid #{Process.pid})"
end

def resolve_dependencies(environment, paths)
  assets = []
  cache  = {}
  paths.each do |path|
    if path == self.pathname.to_s
      unless cache[self]
        cache[self] = true
        assets << self
      end
    elsif asset = environment.find_asset(path, :bundle => false)
      asset.required_assets.each do |asset_dependency|
        unless cache[asset_dependency]
          cache[asset_dependency] = true
          assets << asset_dependency
        end
      end
    end
  end
  assets
end