class Package::Backend::Packaging
	getter name : String

	def initialize(@name, &block : Proc(Package, Bool))
		@callback = block
	end

	def package(package : Package)
		@callback.call package
	end
end

class Package::Context
	property working_directory = "/tmp/package"
	property sources_directory = Dir.current
	property packages_directory = Dir.current

	getter packaging_backends = [] of Backend::Packaging
	getter building_backends = [] of Backend::Building

	def initialize
		@packaging_backends << Backend::Packaging.new "pkgutils" do |package|
			puts "#{package.fake_root_directory} -> #{packages_directory}/#{package.name}##{package.version}.pkg.tar.xz"
			pp! r = run package.fake_root_directory, "tar", ["cJf", "#{packages_directory}/#{package.name}##{package.version}.pkg.tar.xz", "."]

			r.exit_status == 0
		end

		@selected_packaging_backend = @packaging_backends[0]

		@building_backends << Backend::Building.new "configure", "autotools" do |context, recipe|
			Dir.cd recipe.dirname

			unless File.exists? "configure"
				next BuildStatus::Pass
			end

			child = context.run "./configure",  ["--prefix=/package"]

			if child.exit_status == 0
				BuildStatus::Success
			else
				BuildStatus::Failed
			end
		end

		@building_backends << Backend::Building.new "build", "make" do |context, recipe|
			Dir.cd recipe.dirname

			unless File.exists? "Makefile"
				next BuildStatus::Pass
			end

			child = context.run "make"

			if child.exit_status == 0
				BuildStatus::Success
			else
				BuildStatus::Failed
			end
		end
	end

	def packaging_backend=(name : String)
		@selected_packaging_backend = @packaging_backends.find(&.name.==(name)).not_nil!
	end

	def packaging_backend=(backend : Backend::Packaging)
		@selected_packaging_backend = backend
	end

	def run(chdir, command, args)
		Process.run command, args, chdir: chdir, output: Process::Redirect::Inherit, error: Process::Redirect::Inherit
	end

	def run(command, args)
		run nil, command, args
	end

	def run(command)
		run nil, command, nil
	end

	def package(package : Package) : Bool
		@selected_packaging_backend.package package
	end
end