class TinyMCE::Rails::JsonManifest

def self.try(manifest_path, pattern=nil)
  if pattern
    paths = Dir[File.join(manifest_path, pattern)]
    new(paths.first) if paths.any?
  elsif File.file?(manifest_path)
    new(manifest_path)
  end
end

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

def assets
  @manifest["assets"]
end

def dump
  JSON.generate(@manifest)
end

def files
  @manifest["files"]
end

def initialize(file)
  @file = file
  @manifest = JSON.parse(File.read(file))
end

def remove(logical_path)
  if digested = assets.delete(logical_path)
    files.delete(digested)
  end
end

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

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