# encoding: UTF-8
#--
# Copyright (c) 2015 Translation Exchange Inc. http://translationexchange.com
#
#  _______                  _       _   _             ______          _
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#                                                                                       |___/
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#++

class Tml::CacheAdapters::Rails < Tml::Cache

  def initialize
    Tml.logger.info('Initializing Rails cache...')
    @cache = Rails.cache
  end

  def cache_name
    @cache.class.name
  end

  def read_only?
    false
  end

  def fetch(key, opts = {})
    miss = false
    data = @cache.fetch(versioned_key(key, opts)) do
      info("Cache miss: #{key}")
      miss = true
      if block_given?
        yield
      else
        nil
      end
    end
    info("Cache hit: #{key}") unless miss
    data
  rescue Exception => ex
    warn("Failed to retrieve data: #{ex.message}")
    return nil unless block_given?
    yield
  end

  def store(key, data, opts = {})
    info("Cache store: #{key}")
    @cache.write(versioned_key(key, opts), data)
    data
  rescue Exception => ex
    warn("Failed to store data: #{ex.message}")
    key
  end

  def delete(key, opts = {})
    info("Cache delete: #{key}")
    @cache.delete(versioned_key(key, opts))
    key
  rescue Exception => ex
    warn("Failed to delete data: #{ex.message}")
    key
  end

  def exist?(key, opts = {})
    data = @cache.fetch(versioned_key(key, opts))
    not data.nil?
  rescue Exception => ex
    warn("Failed to check if key exists: #{ex.message}")
    false
  end

  def clear(opts = {})
    info("Cache clear")
  rescue Exception => ex
    warn("Failed to clear cache: #{ex.message}")
  end
end