module Cbt

  # handle file platform versinn and copy
  class SrcFile
    attr_accessor :component_name
    def initialize component_name, basename, ext=nil
      unless ext
        if /^(?<basename_>.+?)\.(?<ext_>\w+)$/ =~ basename
          basename, ext = basename_, ext_
        end
      end
      @component_name, @basename, @ext = component_name, basename, ext
    end

    # search up for the source file for the current file object
    # with @name as the basename
    def path dir = [], platform = 'debug'
      # search up for each dir in row
      dir.each do |d|
        [".#{platform}.", "."].each do |filename|
          file_path = File.join(d, @basename + filename + @ext)
          # end search and return the file first found in the given directories
          # return File.expand_path(file_path) if File.exists? file_path
          return file_path if File.exists? file_path
        end
      end
      nil
    end

    # file copy to under workspace 
    def target workspace_dir
      File.join(workspace_dir, @basename + '.' + @ext)
    end

  end # class file

  # module lua file object holds file contents digest to
  # prevent accedental over-write
  class LuaModule < SrcFile
    attr_accessor :name, :super_class

    def initialize component_name, name
      @name, @super_class = name.split("<")
      super(component_name, @name, 'lua')
    end
  end

  # assets files 
  class AssetFile < SrcFile

  end

  class Component
    attr_accessor :name, :modules, :assets

    def initialize name, conf
      @name, @conf = name, conf
      
      # if no modules defined, use the name as default
      @conf["lua_modules"] = Array.new unless @conf["lua_modules"] 
      @conf["lua_modules"] << @name if @conf["lua_modules"].size == 0
        
      @conf["assets"] = Array.new unless @conf["assets"]

      # parse module definitions, convert to objects
      @modules, @assets = {}, {} # name => object pair
      @conf["lua_modules"].each do |lname|
        raise "invalid lua module name '#{lname}'" unless /^[a-zA-Z][\<a-zA-Z_0-9]+$/.match(lname)
        @modules[lname] = LuaModule.new(@name, lname)
      end

      @conf["assets"].each do |asset|
        @assets[asset] = AssetFile.new(@name, asset)
      end
    end

    def tag
      @conf["tag"]
    end

    # where the module/asset files are located
    def dir base_dir
      File.join(base_dir, @name).gsub(/\/$/, '')
    end

    # target working space directory
    def ws_dir base_dir, platform
      File.join(base_dir, @name + '_' + platform).gsub(/\/$/, '')
    end
  end
end