#coding: utf-8
=begin
* 20111115 find bug
  避免每次重新生成CodeHash的对象
* TODO 在项目中要分自己用的还是提供给外边的
=end
require 'fileutils'
module GlobalConst 
  SAMPLE_FILE = "templates/code_hashes/code_hash.yml.sample"
  APP_CODE_HASHES = "config/code_hashes/" 

  mattr_accessor :global_data
  @@global_data = {}
  
  def self.method_missing(method_name, *args, &block)
    ms = method_name.to_sym
    return @@global_data[ms] if @@global_data.key?(ms)
    raise "Method name: #{method_name}(#{args.inspect}) is not defined!"
  end
  
  def self.load_code_hashes!(hash_or_file = SAMPLE_FILE)
    if hash_or_file.is_a?(Hash)
      h = hash_or_file
    else
      h = YAML.load(File.open(hash_or_file))
      unless h.is_a?(Hash)
        #格式异常检查，过滤掉空和无效文件
        puts "==>Warning: Invalid arguments: #{hash_or_file}, it does not evalute to a Hash!你自己去看看，别找我！"
        return
      end
    end
    nh = h.symbolize_keys
    nh.keys.each do |k|
      if @@global_data.key?(k)
        puts "==>Warning: new value(from #{hash_or_file.inspect}) is set for key:#{k}! Please check that is your need!"
      end
      @@global_data[k] = CodeHash.new(nh[k])
    end
  end

  def self.load_app_code_hashes!(dir = APP_CODE_HASHES)
    if defined? Rails
      target = "#{Rails.root}/#{APP_CODE_HASHES}"
      if File.directory?(target)
        hfiles = Dir.glob("#{target}**/*.yml")
        hfiles.each do |f|
          load_code_hashes!(f)
        end
      end
    end
  end
  
  #为引用项目生成样例文件， TODO rake方式生成
  def self.setup_sample(yml_file = "#{APP_CODE_HASHES}code_hash.yml.sample")
    if defined? Rails
      target = "#{Rails.root}/#{yml_file}"
      unless File.exists?(target)
        path = File.dirname(target)
        FileUtils.mkpath(path)
        #默认覆盖已有
        FileUtils.cp(SAMPLE_FILE, target)
      end
    end
  end

  #将一个hash和array写入data下的yaml结构中
  def self.yamlize(hash_or_array = {}, file_name = nil)
    return if hash_or_array.nil?
    hash = if hash_or_array.is_a?(Array)
      hash_or_array.inject({}) do |r, k|
        r[k] = nil
        r
      end
    else
      hash_or_array
    end

    method_key = file_name.nil? ? "hash" : file_name.to_s
    name = "#{method_key}_#{Time.now.to_i}"
    file = "#{Rails.root}/data/#{name}.yml"
    path = File.dirname(file)
    Fileutils.mkpath(path) unless File.directory?(path)
    File.open(file, 'w+') do |f|
      f.puts YAML.dump(method_key.to_sym=>hash)
    end
  end
end