module Puppet::Util::RDoc

    module_function

    # launch a rdoc documenation process
    # with the files/dir passed in +files+
    def rdoc(outputdir, files)
        begin
            Puppet[:ignoreimport] = true

            # then rdoc
            require 'rdoc/rdoc'

            # load our parser
            require 'puppet/util/rdoc/parser'

            r = RDoc::RDoc.new
            RDoc::RDoc::GENERATORS["puppet"] = RDoc::RDoc::Generator.new("puppet/util/rdoc/generators/puppet_generator.rb",
                                                                       "PuppetGenerator".intern,
                                                                       "puppet")
            # specify our own format & where to output
            options = [ "--fmt", "puppet",
                        "--quiet",
                        "--op", outputdir ]

            options += files

            # launch the documentation process
            r.document(options)
        rescue RDoc::RDocError => e
            raise Puppet::ParseError.new("RDoc error %s" % e)
        end
    end

    # launch a output to console manifest doc
    def manifestdoc(files)
        Puppet[:ignoreimport] = true
        files.select { |f| FileTest.file?(f) }.each do |f|
            parser = Puppet::Parser::Parser.new(:environment => Puppet[:environment])
            parser.file = f
            ast = parser.parse
            output(f, ast)
        end
    end

    # Ouputs to the console the documentation
    # of a manifest
    def output(file, ast)
        astobj = []
        ast[:nodes].each do |name, k|
            astobj << k if k.file == file
        end
        ast[:classes].each do |name, k|
            astobj << k if k.file == file
        end
        ast[:definitions].each do |name, k|
            astobj << k if k.file == file
        end
        astobj.sort! {|a,b| a.line <=> b.line }.each do |k|
            output_astnode_doc(k)
        end
    end

    def output_astnode_doc(ast)
        puts ast.doc if !ast.doc.nil? and !ast.doc.empty?
        if Puppet.settings[:document_all]
            # scan each underlying resources to produce documentation
            code = ast.code.children if ast.code.is_a?(Puppet::Parser::AST::ASTArray)
            code ||= ast.code
            output_resource_doc(code) unless code.nil?
        end
    end

    def output_resource_doc(code)
        code.sort { |a,b| a.line <=> b.line }.each do |stmt|
            output_resource_doc(stmt.children) if stmt.is_a?(Puppet::Parser::AST::ASTArray)

            if stmt.is_a?(Puppet::Parser::AST::Resource)
                puts stmt.doc if !stmt.doc.nil? and !stmt.doc.empty?
            end
        end
    end

end