#treevisitor
require 'treevisitor/tree_node_visitor'
require 'treevisitor/visitors/callback_tree_node_visitor2'

# ralbum
require 'ralbum/album_tree/album'
require 'ralbum/album_tree/image_pool'
require 'ralbum/album_tree/image_file'


class GenerateAlbumTreeNodeVisitor < CallbackTreeNodeVisitor2
    
  def initialize( album_dirname, catalog, image_strategies )
    super()
    @album_dirname = album_dirname
    @catalog = catalog
    @image_strategies = image_strategies

    # TODO: eliminare le seguenti chiamate, trovare il visitor giusto da cui ereditare
    on_enter_tree_node do |photo_tree_node, parentAlbumNode|
      _on_enter_tree_node photo_tree_node, parentAlbumNode
    end

    on_visit_leaf_node do |photo_item, parent_album_node|
      _on_visit_leaf_node photo_item, parent_album_node
    end
  end

  def run( photo_tree )
    ralbum_verbose( 1, "generate albumtree" )
    ralbum_verbose( 1, "create images" )
    photo_tree.accept( self )
    root
  end

  def _on_enter_tree_node(photo_tree_node, parent_album_node)
    album_key   = @catalog.album_key( photo_tree_node.path )
    album_title = photo_tree_node.name    # instead of photo_tree_node["title"]
    album_desc  = photo_tree_node["shortdesc"]
    albumNode   = Album.new( parent_album_node, album_key, album_title, album_desc )
  end

  def _on_visit_leaf_node(photo_item, parent_album_node)
    photo_key   = @catalog.key( photo_item.photo_file.md5 )
    photo_title = photo_item.title
    photo_desc  = photo_item.description
    image_pool   = ImagePool.new( parent_album_node, photo_item.photo_file.md5, photo_key, photo_title, photo_desc )
    msg = ""

    @image_strategies.each_pair {|name,image_strategy|
      image_basename = @catalog.photo_file( photo_item )

      inpath = photo_item.photo_file.path

      outdir = File.join( @album_dirname, "images_" + image_strategy.name )
      outpath = File.join( outdir, image_basename )
      msg += "#{name} "
      if File.exist?(outpath) and File.mtime(inpath) < File.mtime(outpath)
        msg += "(s) "
      else
        Dir.mkdir( outdir ) unless File.exist?( outdir )
        msg += image_strategy.build( inpath, outpath )
      end

      src_url  = File.join(image_pool.relroot_with_prefix, "images_" + image_strategy.name, image_basename)
      image = ImageFile.new( image_pool, outpath, src_url, image_basename + ".html" )

      image_pool.image( name, image )
    }
    ralbum_verbose( 2, sprintf("%40s: %s \n", photo_item.basename, msg ) )
  end

end