module Autoproj
    module PackageManagers
        # Package manager interface for Mac OS using homebrew as
        # its package manager
        class HomebrewManager < ShellScriptManager
            def initialize(ws)
                super(ws, true,
                        %w{brew install},
                        %w{brew install},
                        false)
            end

            def filter_uptodate_packages(packages)
                # TODO there might be duplicates in packages which should be fixed
                # somewhere else
                packages = packages.uniq
                command_line = "brew info --json=v1 #{packages.join(' ')}"
                result = Autoproj.bundler_with_unbundled_env do
                    (Autobuild::Subprocess.run 'autoproj', 'osdeps', command_line).first
                end

                begin
                    JSON.parse(result)
                rescue JSON::ParserError
                    if result && !result.empty?
                        Autoproj.warn "Error while parsing result of brew info --json=v1"
                    else
                        # one of the packages is unknown fallback to install all
                        # packaes which will complain about it
                    end
                    return packages
                end

                # fall back if something else went wrong
                if packages.size != result.size
                    Autoproj.warn "brew info returns less or more packages when requested. Falling back to install all packages"
                    return packages
                end

                new_packages = []
                result.each do |pkg|
                    new_packages << pkg["name"] if pkg["installed"].empty?
                end
                new_packages
            end

            def install(packages, filter_uptodate_packages: true, install_only: false)
                if filter_uptodate_packages || install_only
                    packages = filter_uptodate_packages(packages)
                end
                super(packages)
            end
        end
    end
end