require 'fileutils'
require 'padrino-core'
require 'padrino-helpers'
FileSet.glob_require('padrino-cache/{helpers}/*.rb', __FILE__)

module Padrino
  class << self
    ##
    # Returns the caching engine
    #
    # @example
    #   # with: Padrino.cache = Padrino::Cache::Store::File.new(/my/cache/path)
    #   Padrino.cache.set('val', 'test')
    #   Padrino.cache.get('val') # => 'test'
    #   Padrino.cache.delete('val')
    #   Padrino.cache.flush
    #
    # @api public
    def cache
      @_cache
    end

    ##
    # Set the caching engine
    #
    # @param value
    #   Instance of Padrino::Cache::Store
    #
    # @example
    #   Padrino.cache = Padrino::Cache::Store::Memcache.new(::Memcached.new('127.0.0.1:11211', :exception_retry_limit => 1))
    #   Padrino.cache = Padrino::Cache::Store::Memcache.new(::Dalli::Client.new('127.0.0.1:11211', :exception_retry_limit => 1))
    #   Padrino.cache = Padrino::Cache::Store::Redis.new(::Redis.new(:host => '127.0.0.1', :port => 6379, :db => 0))
    #   Padrino.cache = Padrino::Cache::Store::Mongo.new(::Mongo::Connection.new('127.0.0.1', 27017).db('padrino'), :username => 'username', :password => 'password', :size => 64, :max => 100, :collection => 'cache')
    #   Padrino.cache = Padrino::Cache::Store::Memory.new(50)
    #   Padrino.cache = Padrino::Cache::Store::File.new(/my/cache/path)
    #
    #   # You can manage your cache from anywhere in your app:
    #
    #   Padrino.cache.set('val', 'test')
    #   Padrino.cache.get('val') # => 'test'
    #   Padrino.cache.delete('val')
    #   Padrino.cache.flush
    #
    # @api public
    def cache=(value)
      @_cache= value
    end
  end # self

  ##
  # This component enables caching of an application's response contents on
  # both page- and fragment-levels. Output cached in this manner is
  # persisted, until it expires or is actively expired, in a configurable store
  # of your choosing. Several common caching stores are supported out of the box.
  #
  module Cache
    autoload :Store,  'padrino-cache/store'
    autoload :Parser, 'padrino-cache/parser'

    class << self
      ##
      # Register these helpers:
      #
      #   Padrino::Cache::Helpers::CacheStore
      #   Padrino::Cache::Helpers::Fragment
      #   Padrino::Cache::Helpers::Page
      #
      # for Padrino::Application.
      #
      # By default we use FileStore as showed below:
      #
      #   set :cache, Padrino::Cache::Store::File.new(File.join(app.root, 'tmp', 'cache'))
      #
      # However, you can also change the file store easiily in your app.rb:
      #
      #   set :cache, Padrino::Cache::Store::Memcache.new(::Memcached.new('127.0.0.1:11211', :exception_retry_limit => 1))
      #   set :cache, Padrino::Cache::Store::Memcache.new(::Dalli::Client.new('127.0.0.1:11211', :exception_retry_limit => 1))
      #   set :cache, Padrino::Cache::Store::Redis.new(::Redis.new(:host => '127.0.0.1', :port => 6379, :db => 0))
      #   set :cache, Padrino::Cache::Store::Mongo.new(::Mongo::Connection.new('127.0.0.1', 27017).db('padrino'), :username => 'username', :password => 'password', :size => 64, :max => 100, :collection => 'cache')
      #   set :cache, Padrino::Cache::Store::Memory.new(50)
      #   set :cache, Padrino::Cache::Store::File.new(Padrino.root('tmp', app_name.to_s, 'cache')) # default choice
      #
      # You can manage your cache from anywhere in your app:
      #
      #   MyApp.cache.set('val', 'test')
      #   MyApp.cache.get('val') # => 'test'
      #   MyApp.cache.delete('val')
      #   MyApp.cache.flush
      #
      # @api public
      def registered(app)
        app.helpers Padrino::Cache::Helpers::CacheStore
        app.helpers Padrino::Cache::Helpers::Fragment
        app.helpers Padrino::Cache::Helpers::Page
        app.set :cache, Padrino::Cache::Store::File.new(Padrino.root('tmp', defined?(app.app_name) ? app.app_name.to_s : '', 'cache'))
        app.disable :caching
      end
      alias :included :registered

      # @private
      def padrino_route_added(route, verb, path, args, options, block) # @private
        Padrino::Cache::Helpers::Page.padrino_route_added(route, verb, path, args, options, block)
      end
    end

    Padrino.cache = Store::Memory.new(50)
  end # Cache
end # Padrino