require 'redis'
require 'json'
require 'base64'
require 'zip/zip'
require 'yaml'
require 'rhosync/license'
require 'rhosync/version'
require 'rhosync/document'
require 'rhosync/lock_ops'
require 'rhosync/model'
require 'rhosync/source'
require 'rhosync/user'
require 'rhosync/api_token'
require 'rhosync/app'
require 'rhosync/store'
require 'rhosync/client'
require 'rhosync/read_state'
require 'rhosync/client_sync'
require 'rhosync/source_adapter'
require 'rhosync/source_sync'
require 'rhosync/indifferent_access'
require 'rhosync/jobs/source_job'
require 'rhosync/jobs/ping_job'
require 'rhosync/bulk_data'
  
# Various module utilities for the store
module Rhosync
  APP_NAME = 'application' unless defined? APP_NAME
  
  class InvalidArgumentError < RuntimeError; end
  class RhosyncServerError < RuntimeError; end
  extend self
    
  class << self
    attr_accessor :base_directory, :app_directory, :data_directory, 
      :vendor_directory, :blackberry_bulk_sync, :redis, :environment,
      :log_disabled, :license
  end
  
  ### Begin Rhosync setup methods  
  # Server hook to initialize Rhosync
  def bootstrap(basedir)
    config = get_config(basedir)
    #Load environment
    environment = (ENV['RHO_ENV'] || :development).to_sym     
    # Initialize Rhosync and Resque
    Rhosync.base_directory = basedir    
    Rhosync.app_directory = get_setting(config,environment,:app_directory)
    Rhosync.data_directory = get_setting(config,environment,:data_directory)
    Rhosync.vendor_directory = get_setting(config,environment,:vendor_directory)
    Rhosync.blackberry_bulk_sync = get_setting(config,environment,:blackberry_bulk_sync,false)
    Rhosync.redis = get_setting(config,environment,:redis,false)
    Rhosync.log_disabled = get_setting(config,environment,:log_disabled,false)
    Rhosync.environment = environment    
    yield self if block_given?
    Store.create(Rhosync.redis)
    Resque.redis = Store.db
    Rhosync.base_directory ||= File.join(File.dirname(__FILE__),'..')
    Rhosync.app_directory ||= Rhosync.base_directory
    Rhosync.data_directory ||= File.join(Rhosync.base_directory,'data')
    Rhosync.vendor_directory ||= File.join(Rhosync.base_directory,'vendor')
    Rhosync.blackberry_bulk_sync ||= false
    Rhosync.log_disabled ||= false
    Rhosync.license = License.new
    
    check_and_add(File.join(Rhosync.app_directory,'sources'))
    start_app(config)
    create_admin_user
    check_hsql_lib! if Rhosync.blackberry_bulk_sync
  end
  
  def start_app(config)
    if config and config[Rhosync.environment]
      app = nil
      app_name = APP_NAME
      if App.is_exist?(app_name)
        app = App.load(app_name)
      else
        app = App.create(:name => app_name)
      end
      sources = config[:sources] || []
      sources.each do |source_name,fields|
        if Source.is_exist?(source_name)  
          s = Source.load(source_name,{:app_id => app.name,:user_id => '*'})
          s.update(fields)
        else  
          fields[:name] = source_name
          Source.create(fields,{:app_id => app.name})
        end
        unless app.sources.members.include?(source_name)
          app.sources << source_name
        end
        # load ruby file for source adapter to re-load class
        load under_score(source_name+'.rb')
      end
    end
  end
  
  # Generate admin user on first load
  def create_admin_user
    unless User.is_exist?('admin')
      admin = User.create({:login => 'admin', :admin => 1})
      admin.password = ''
      admin.create_token
    end
  end

  # Add path to load_path unless it has been added already
  def check_and_add(path)
    $:.unshift path unless $:.include?(path) 
  end

  def get_config(basedir)
    # Load settings
    settings_file = File.join(basedir,'settings','settings.yml') if basedir
    config = YAML.load_file(settings_file) if settings_file and File.exist?(settings_file)
  end
  ### End Rhosync setup methods  
  
  
  def check_default_secret!(secret)
    if secret == '<changeme>'                        
      log "*"*60+"\n\n"
      log "WARNING: Change the session secret in config.ru from <changeme> to something secure."
      log "  i.e. running `rake secret` in a rails app will generate a secret you could use.\n\n"
      log "*"*60
    end
  end

  # Serializes oav to set element
  def setelement(obj,attrib,value)
    "#{obj}:#{attrib}:#{Base64.encode64(value.to_s)}"
  end

  # De-serializes oav from set element
  def getelement(element)
    res = element.split(':')
    [res[0], res[1], Base64.decode64(res[2].to_s)]
  end

  # Get random UUID string
  def get_random_uuid
    UUIDTools::UUID.random_create.to_s.gsub(/\-/,'')
  end

  # Generates new token (64-bit integer) based on # of 
  # microseconds since Jan 1 2009
  def get_token
    ((Time.now.to_f - Time.mktime(2009,"jan",1,0,0,0,0).to_f) * 10**6).to_i
  end

  # Computes token for a single client request
  def compute_token(doc_key)
    token = get_token
    Store.put_value(doc_key,token)
    token.to_s
  end

  # Returns require-friendly filename for a class
  def under_score(camel_cased_word)
    camel_cased_word.to_s.gsub(/::/, '/').
    gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
    gsub(/([a-z\d])([A-Z])/,'\1_\2').
    tr("-", "_").
    downcase
  end

  # Taken from rails inflector
  def camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)
    if first_letter_in_uppercase
      lower_case_and_underscored_word.to_s.gsub(/\/(.?)/) { "::#{$1.upcase}" }.gsub(/(?:^|_)(.)/) { $1.upcase }
    end
  end

  def check_hsql_lib!
    unless File.exists?(File.join(Rhosync.vendor_directory,'hsqldata.jar'))
      log "*"*60
      log ""
      log "WARNING: Missing vendor/hsqldata.jar, please install it for BlackBerry bulk sync support."
      log ""
      log "*"*60
    end
  end

  def unzip_file(file_dir,params)
    uploaded_file = File.join(file_dir, params[:filename])
    begin
      File.open(uploaded_file, 'wb') do |file|
        file.write(params[:tempfile].read)
      end
      Zip::ZipFile.open(uploaded_file) do |zip_file|
        zip_file.each do |f|
          f_path = File.join(file_dir,f.name)
          FileUtils.mkdir_p(File.dirname(f_path))
          zip_file.extract(f, f_path) { true }
        end
      end
    rescue Exception => e
      log "Failed to unzip `#{uploaded_file}`"
      raise e
    ensure
      FileUtils.rm_f(uploaded_file)
    end
  end

  def lap_timer(msg,start)
    duration = timenow - start
    log "#{msg}: #{duration}"
    timenow
  end

  def start_timer(msg='starting')
    log "#{msg}"
    timenow
  end

  def timenow
    (Time.now.to_f * 1000)
  end
  
  def log(*args)
    now = Time.now.strftime('%I:%M:%S %p %Y-%m-%d')
    puts "[#{now}] #{args.join}" unless Rhosync.log_disabled
  end
  
  # Base rhosync application class
  class Base
    # Add everything in vendor to load path
    # TODO: Integrate with 3rd party dependency management
    def self.initializer(path=nil)
      Dir["vendor/*"].each do |dir|
        $:.unshift File.join(dir,'lib')
      end
      require 'rhosync'
      require 'rhosync/server'
      # Bootstrap Rhosync system
      Rhosync.bootstrap(path || ENV['PWD'])
    end
    
    def self.store_blob(obj,field_name,blob)
      blob[:tempfile].path if blob[:tempfile]
    end
  end
  
  protected
  def get_setting(config,environment,setting,default=nil)
    res = nil
    res = config[environment][setting] if config and environment 
    res || default
  end
end