class TinyMCE::JsonManifest

def self.try(manifest_path)
  paths = Dir[File.join(manifest_path, "manifest*.json")]
  new(paths.first) if paths.any?
end

def append(logical_path, file)
  stat = File.stat(file)
  
  @manifest["assets"][logical_path] = logical_path
  @manifest["files"][logical_path] = {
    "logical_path" => logical_path,
    "mtime"        => stat.mtime.iso8601,
    "size"         => stat.size,
    "digest"       => nil
  }
end

def dump
  MultiJson.dump(@manifest)
end

def each(pattern)
  @manifest["assets"].each_key do |asset|
    yield asset if asset =~ pattern
  end
end

def initialize(file)
  @file = file
  @manifest = MultiJson.load(File.read(file))
end

def remove(logical_path)
  if digested = @manifest["assets"].delete(logical_path)
    @manifest["files"].delete(digested)
  end
end

def remove_digest(logical_path)
  if digested = @manifest["assets"][logical_path]
    @manifest["assets"][logical_path] = logical_path
    @manifest["files"][logical_path] = @manifest["files"].delete(digested).tap { |f| f["digest"] = nil }
    yield digested, logical_path if block_given?
  end
end

def to_s
  dump
end

def write
  File.open(@file, "wb") { |f| f.write(dump) }
end