require "../backends.cr"

class ApkBackend < Package::Backend::Packaging
	def initialize
		@name = "apk"
	end

	def package(context : Package::Context, package : Package::Package) : Bool
		# FIXME: This needs to have access to architecture (from Context?)
		#        to work properly.
		old_cwd = Dir.current

		File.write "#{package.fake_root_directory}/.PKGINFO", ApkBackend.pkginfo package

		# Create data.tar.gz here.
		package_target = "#{context.packages_directory}/#{context.architecture}/#{package.name}-#{package.version}-r#{package.release}.apk"
		Dir.mkdir_p File.dirname package_target

		# FIXME: This shouldn’t have to be in users’ PATH. libexec?
		r = context.run package.fake_root_directory, "#{OWN_LIBEXEC_DIR}/assemble-apk.sh", [
			package_target
		]

		r.exit_status == 0
	end

	# This generated file content is specific to the Apk package manager.
	def self.pkginfo(package)
		du = `du -sk #{package.fake_root_directory}`
		size = du.sub(/[ \t].*/, "").to_i * 1024

		lines = [] of String

		lines << "# Generated by `packaging`."
		lines << "pkgname = #{package.name}"
		lines << "pkgver = #{package.version}-r#{package.release}"
		lines << "url = #{package.url || ""} "
		lines << "size = #{size}"
		lines << "origin = #{package.recipe.name}"
		lines << "buildtype = host" # This’ll need to be imported from Context.
		lines << "builddate = #{Time.utc.to_unix}"

		package.dependencies.each do |atom|
			lines << "depend = #{atom.to_s}"
		end

		package.provides.each do |atom|
			lines << "provides = #{atom.to_s}"
		end

		package.conflicts.each do |atom|
			lines << "conflicts = #{atom.to_s}"
		end

		lines.join("\n") + "\n"
	end

	# Install programs.
	def self.install(packages : Array(String))
		opts = ["add"] + (ENV["APK_FLAGS"]? || "-i").split(/[ \t]+/) + packages
		puts "+ apk #{opts.join " "}"
		r = Process.run "apk", opts,
			output: Process::Redirect::Inherit,
			input: Process::Redirect::Inherit,
			error: Process::Redirect::Inherit
		if r.exit_status != 0
			STDERR.puts "!! Running apk failed!"
			exit 8
		end
	end
end