#
#   tk/msgcat.rb : methods for Tcl message catalog
#                     by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
#
require 'tk'

#class TkMsgCatalog
class TkMsgCatalog < TkObject
  include TkCore
  extend Tk
  #extend TkMsgCatalog

  TkCommandNames = [
    '::msgcat::mc'.freeze, 
    '::msgcat::mcmax'.freeze, 
    '::msgcat::mclocale'.freeze, 
    '::msgcat::mcpreferences'.freeze, 
    '::msgcat::mcload'.freeze, 
    '::msgcat::mcset'.freeze, 
    '::msgcat::mcmset'.freeze, 
    '::msgcat::mcunknown'.freeze
  ].freeze

  tk_call_without_enc('package', 'require', 'Tcl', '8.2')

  PACKAGE_NAME = 'msgcat'.freeze
  def self.package_name
    PACKAGE_NAME
  end

  if self.const_defined? :FORCE_VERSION
    tk_call_without_enc('package', 'require', 'msgcat', FORCE_VERSION)
  else
    tk_call_without_enc('package', 'require', 'msgcat')
  end

  MSGCAT_EXT = '.msg'

  UNKNOWN_CBTBL = Hash.new{|hash,key| hash[key] = {}}.taint

  TkCore::INTERP.add_tk_procs('::msgcat::mcunknown', 'args', <<-'EOL')
    if {[set st [catch {eval {ruby_cmd TkMsgCatalog callback} [namespace current] $args} ret]] != 0} {
       #return -code $st $ret
       set idx [string first "\n\n" $ret]
       if {$idx > 0} {
          return -code $st \
                 -errorinfo [string range $ret [expr $idx + 2] \
                                               [string length $ret]] \
                 [string range $ret 0 [expr $idx - 1]]
       } else {
          return -code $st $ret
       }
    } else {
        return $ret
    }
  EOL

  def self.callback(namespace, locale, src_str, *args)
    src_str = sprintf(src_str, *args) unless args.empty?
    cmd_tbl = TkMsgCatalog::UNKNOWN_CBTBL[TkCore::INTERP.__getip]
    cmd = cmd_tbl[namespace]
    cmd = cmd_tbl['::'] unless cmd  # use global scope as interp default
    return src_str unless cmd       # no cmd -> return src-str (default action)
    begin
      cmd.call(locale, src_str)
    rescue SystemExit
      exit(0)
    rescue Interrupt
      exit!(1)
    rescue Exception => e
      begin
        msg = _toUTF8(e.class.inspect) + ': ' + 
              _toUTF8(e.message) + "\n" + 
              "\n---< backtrace of Ruby side >-----\n" + 
              _toUTF8(e.backtrace.join("\n")) + 
              "\n---< backtrace of Tk side >-------"
        msg.instance_variable_set(:@encoding, 'utf-8')
      rescue Exception
        msg = e.class.inspect + ': ' + e.message + "\n" + 
              "\n---< backtrace of Ruby side >-----\n" + 
              e.backtrace.join("\n") + 
              "\n---< backtrace of Tk side >-------"
      end
      fail(e, msg)
    end
  end

  def initialize(namespace = nil)
    if namespace.kind_of?(TkNamespace)
      @namespace = namespace
    elsif namespace == nil
      @namespace = TkNamespace.new('::')  # global namespace
    else
      @namespace = TkNamespace.new(namespace)
    end
    @path = @namespace.path

    @msgcat_ext = '.msg'
  end
  attr_accessor :msgcat_ext

  def method_missing(id, *args)
    # locale(src, trans) ==> set_translation(locale, src, trans)
    loc = id.id2name
    case args.length
    when 0 # set locale
      self.locale=(loc)

    when 1 # src only, or trans_list
      if args[0].kind_of?(Array)
        # trans_list
        #list = args[0].collect{|src, trans|
        #  [ Tk::UTF8_String.new(src), Tk::UTF8_String.new(trans) ]
        #}
        self.set_translation_list(loc, args[0])
      else
        # src
        #self.set_translation(loc, Tk::UTF8_String.new(args[0]))
        self.set_translation(loc, args[0])
      end

    when 2 # src and trans, or, trans_list and enc
      if args[0].kind_of?(Array)
      else
        #self.set_translation(loc, args[0], Tk::UTF8_String.new(args[1]))
        self.set_translation(loc, *args)
      end

    when 3 # src and trans and enc
      self.set_translation(loc, *args)

    else
      super(id, *args)
#      fail NameError, "undefined method `#{name}' for #{self.to_s}", error_at

    end
  end

  # *args ::= form, arg, arg, ...
  def self.translate(*args)
    dst = args.collect{|src|
      tk_call_without_enc('::msgcat::mc', _get_eval_string(src, true))
    }
    Tk.UTF8_String(sprintf(*dst))
  end
  class << self
    alias mc translate
    alias [] translate
  end
  def translate(*args)
    dst = args.collect{|src|
      @namespace.eval{tk_call_without_enc('::msgcat::mc', 
                                          _get_eval_string(src, true))}
    }
    Tk.UTF8_String(sprintf(*dst))
  end
  alias mc translate
  alias [] translate

  def self.maxlen(*src_strings)
    tk_call('::msgcat::mcmax', *src_strings).to_i
  end
  def maxlen(*src_strings)
    @namespace.eval{tk_call('::msgcat::mcmax', *src_strings).to_i}
  end

  def self.locale
    tk_call('::msgcat::mclocale')
  end
  def locale
    @namespace.eval{tk_call('::msgcat::mclocale')}
  end

  def self.locale=(locale)
    tk_call('::msgcat::mclocale', locale)
  end
  def locale=(locale)
    @namespace.eval{tk_call('::msgcat::mclocale', locale)}
  end

  def self.preferences
    tk_split_simplelist(tk_call('::msgcat::mcpreferences'))
  end
  def preferences
    tk_split_simplelist(@namespace.eval{tk_call('::msgcat::mcpreferences')})
  end

  def self.load_tk(dir)
    number(tk_call('::msgcat::mcload', dir))
  end

  def self.load_rb(dir)
    count = 0
    preferences().each{|loc|
      file = File.join(dir, loc + self::MSGCAT_EXT)
      if File.readable?(file)
        count += 1
        eval(open(file){|f| f.read})
      end
    }
    count
  end

  def load_tk(dir)
    number(@namespace.eval{tk_call('::msgcat::mcload', dir)})
  end

  def load_rb(dir)
    count = 0
    preferences().each{|loc|
      file = File.join(dir, loc + @msgcat_ext)
      if File.readable?(file)
        count += 1
        @namespace.eval(open(file){|f| f.read})
      end
    }
    count
  end

  def self.load(dir)
    self.load_rb(dir)
  end
  alias load load_rb

  def self.set_translation(locale, src_str, trans_str=None, enc='utf-8')
    if trans_str && trans_str != None
      trans_str = Tk.UTF8_String(_toUTF8(trans_str, enc))
      Tk.UTF8_String(tk_call_without_enc('::msgcat::mcset', 
                                         locale, 
                                         _get_eval_string(src_str, true), 
                                         trans_str))
    else
      Tk.UTF8_String(tk_call_without_enc('::msgcat::mcset', 
                                         locale, 
                                         _get_eval_string(src_str, true)))
    end
  end
  def set_translation(locale, src_str, trans_str=None, enc='utf-8')
    if trans_str && trans_str != None
      trans_str = Tk.UTF8_String(_toUTF8(trans_str, enc)) 
      Tk.UTF8_String(@namespace.eval{
                       tk_call_without_enc('::msgcat::mcset', 
                                           locale, 
                                           _get_eval_string(src_str, true), 
                                           trans_str)
                     })
    else
      Tk.UTF8_String(@namespace.eval{
                       tk_call_without_enc('::msgcat::mcset', 
                                           locale, 
                                           _get_eval_string(src_str, true))})
    end
  end

  def self.set_translation_list(locale, trans_list, enc='utf-8')
    # trans_list ::= [ [src, trans], [src, trans], ... ]
    list = []
    trans_list.each{|src, trans|
      if trans && trans != None
        list << _get_eval_string(src, true) 
        list << Tk.UTF8_Stirng(_toUTF8(trans, enc))
      else
        list << _get_eval_string(src, true) << ''
      end
    }
    number(tk_call_without_enc('::msgcat::mcmset', locale, list))
  end
  def set_translation_list(locale, trans_list, enc='utf-8')
    # trans_list ::= [ [src, trans], [src, trans], ... ]
    list = []
    trans_list.each{|src, trans|
      if trans && trans != None
        list << _get_eval_string(src, true) 
        list << Tk.UTF8_String(_toUTF8(trans, enc))
      else
        list << _get_eval_string(src, true) << ''
      end
    }
    number(@namespace.eval{
             tk_call_without_enc('::msgcat::mcmset', locale, list)
           })
  end

  def self.def_unknown_proc(cmd=Proc.new)
    TkMsgCatalog::UNKNOWN_CBTBL[TkCore::INTERP.__getip]['::'] = cmd
  end
  def def_unknown_proc(cmd=Proc.new)
    TkMsgCatalog::UNKNOWN_CBTBL[TkCore::INTERP.__getip][@namespace.path] = cmd
  end
end

TkMsgCat = TkMsgCatalog