module Comfpile
    class FilesourceArtefact < Artefact
        attr_reader :filename
        alias path filename
        alias file filename

        def initialize(*args, file: nil, **opts)
            super(*args, **opts)

            @original_filename = file

            unless File.exist? @original_filename
                fail! "File could not be loaded!" 
                
                return
            end

            @filename = @target

            add_step do
                FileUtils.mkpath File.dirname(@filename)
                FileUtils.cp @original_filename, @filename
            end
        end

        def mtime
            File.mtime(@filename)
        end
    end

    class FilesourceEngine < ArtefactEngine
        def initialize(core, **options)
            super(core, **options)

            @root_path = options[:root_path]
        end

        def craft(stage, target, context)
            return nil unless stage == :sourcefile

            full_path = File.expand_path(File.join(@root_path, target))
            
            return nil unless File.exists? full_path

            FilesourceArtefact.new(@core, self, stage, target, context,
                file: full_path);
        end
    end
end