# typed: false
# frozen_string_literal: true

require "utils/bottles"
require "utils/gems"
require "formula"
require "cask/cask_loader"
require "set"

module Homebrew
  # Helper class for cleaning up the Homebrew cache.
  #
  # @api private
  class Cleanup
    CLEANUP_DEFAULT_DAYS = 30
    private_constant :CLEANUP_DEFAULT_DAYS

    # {Pathname} refinement with helper functions for cleaning up files.
    module CleanupRefinement
      refine Pathname do
        def incomplete?
          extname.end_with?(".incomplete")
        end

        def nested_cache?
          directory? && %w[
            cargo_cache
            go_cache
            go_mod_cache
            glide_home
            java_cache
            npm_cache
            gclient_cache
          ].include?(basename.to_s)
        end

        def go_cache_directory?
          # Go makes its cache contents read-only to ensure cache integrity,
          # which makes sense but is something we need to undo for cleanup.
          directory? && %w[go_cache go_mod_cache].include?(basename.to_s)
        end

        def prune?(days)
          return false unless days
          return true if days.zero?

          return true if symlink? && !exist?

          mtime < days.days.ago && ctime < days.days.ago
        end

        def stale?(scrub: false)
          return false unless resolved_path.file?

          if dirname.basename.to_s == "Cask"
            stale_cask?(scrub)
          else
            stale_formula?(scrub)
          end
        end

        private

        def stale_formula?(scrub)
          return false unless HOMEBREW_CELLAR.directory?

          version = if to_s.match?(Pathname::BOTTLE_EXTNAME_RX)
            begin
              Utils::Bottles.resolve_version(self)
            rescue
              nil
            end
          end

          version ||= basename.to_s[/\A.*(?:--.*?)*--(.*?)#{Regexp.escape(extname)}\Z/, 1]
          version ||= basename.to_s[/\A.*--?(.*?)#{Regexp.escape(extname)}\Z/, 1]

          return false unless version

          version = Version.new(version)

          return false unless formula_name = basename.to_s[/\A(.*?)(?:--.*?)*--?(?:#{Regexp.escape(version)})/, 1]

          formula = begin
            Formulary.from_rack(HOMEBREW_CELLAR/formula_name)
          rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
            nil
          end

          return false if formula.blank?

          resource_name = basename.to_s[/\A.*?--(.*?)--?(?:#{Regexp.escape(version)})/, 1]

          if resource_name == "patch"
            patch_hashes = formula.stable&.patches&.select(&:external?)&.map(&:resource)&.map(&:version)
            return true unless patch_hashes&.include?(Checksum.new(:sha256, version.to_s))
          elsif resource_name && resource_version = formula.stable&.resources&.dig(resource_name)&.version
            return true if resource_version != version
          elsif version.is_a?(PkgVersion)
            return true if formula.pkg_version > version
          elsif formula.version > version
            return true
          end

          return true if scrub && !formula.latest_version_installed?

          return true if Utils::Bottles.file_outdated?(formula, self)

          false
        end

        def stale_cask?(scrub)
          return false unless name = basename.to_s[/\A(.*?)--/, 1]

          cask = begin
            Cask::CaskLoader.load(name)
          rescue Cask::CaskError
            nil
          end

          return false if cask.blank?

          return true unless basename.to_s.match?(/\A#{Regexp.escape(name)}--#{Regexp.escape(cask.version)}\b/)

          return true if scrub && !cask.versions.include?(cask.version)

          if cask.version.latest?
            return mtime < CLEANUP_DEFAULT_DAYS.days.ago &&
                   ctime < CLEANUP_DEFAULT_DAYS.days.ago
          end

          false
        end
      end
    end

    using CleanupRefinement

    extend Predicable

    PERIODIC_CLEAN_FILE = (HOMEBREW_CACHE/".cleaned").freeze

    attr_predicate :dry_run?, :scrub?
    attr_reader :args, :days, :cache, :disk_cleanup_size

    def initialize(*args, dry_run: false, scrub: false, days: nil, cache: HOMEBREW_CACHE)
      @disk_cleanup_size = 0
      @args = args
      @dry_run = dry_run
      @scrub = scrub
      @days = days || Homebrew::EnvConfig.cleanup_max_age_days.to_i
      @cache = cache
      @cleaned_up_paths = Set.new
    end

    def self.install_formula_clean!(f)
      return if Homebrew::EnvConfig.no_install_cleanup?

      cleanup = Cleanup.new
      if cleanup.periodic_clean_due?
        cleanup.periodic_clean!
      elsif f.latest_version_installed?
        cleanup.cleanup_formula(f)
      end
    end

    def periodic_clean_due?
      return false if Homebrew::EnvConfig.no_install_cleanup?

      unless PERIODIC_CLEAN_FILE.exist?
        HOMEBREW_CACHE.mkpath
        FileUtils.touch PERIODIC_CLEAN_FILE
        return false
      end

      PERIODIC_CLEAN_FILE.mtime < CLEANUP_DEFAULT_DAYS.days.ago
    end

    def periodic_clean!
      return false unless periodic_clean_due?

      ohai "`brew cleanup` has not been run in #{CLEANUP_DEFAULT_DAYS} days, running now..."
      clean!(quiet: true, periodic: true)
    end

    def clean!(quiet: false, periodic: false)
      if args.empty?
        Formula.installed.sort_by(&:name).each do |formula|
          cleanup_formula(formula, quiet: quiet, ds_store: false, cache_db: false)
        end
        cleanup_cache
        cleanup_logs
        cleanup_lockfiles
        prune_prefix_symlinks_and_directories

        unless dry_run?
          cleanup_cache_db
          rm_ds_store
          HOMEBREW_CACHE.mkpath
          FileUtils.touch PERIODIC_CLEAN_FILE
        end

        # Cleaning up Ruby needs to be done last to avoid requiring additional
        # files afterwards. Additionally, don't allow it on periodic cleans to
        # avoid having to try to do a `brew install` when we've just deleted
        # the running Ruby process...
        return if periodic

        cleanup_portable_ruby
      else
        args.each do |arg|
          formula = begin
            Formulary.resolve(arg)
          rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
            nil
          end

          cask = begin
            Cask::CaskLoader.load(arg)
          rescue Cask::CaskError
            nil
          end

          cleanup_formula(formula) if formula
          cleanup_cask(cask) if cask
        end
      end
    end

    def unremovable_kegs
      @unremovable_kegs ||= []
    end

    def cleanup_formula(formula, quiet: false, ds_store: true, cache_db: true)
      formula.eligible_kegs_for_cleanup(quiet: quiet)
             .each(&method(:cleanup_keg))
      cleanup_cache(Pathname.glob(cache/"#{formula.name}--*"))
      rm_ds_store([formula.rack]) if ds_store
      cleanup_cache_db(formula.rack) if cache_db
      cleanup_lockfiles(FormulaLock.new(formula.name).path)
    end

    def cleanup_cask(cask, ds_store: true)
      cleanup_cache(Pathname.glob(cache/"Cask/#{cask.token}--*"))
      rm_ds_store([cask.caskroom_path]) if ds_store
      cleanup_lockfiles(CaskLock.new(cask.token).path)
    end

    def cleanup_keg(keg)
      cleanup_path(keg) { keg.uninstall }
    rescue Errno::EACCES => e
      opoo e.message
      unremovable_kegs << keg
    end

    def cleanup_logs
      return unless HOMEBREW_LOGS.directory?

      logs_days = if days > CLEANUP_DEFAULT_DAYS
        CLEANUP_DEFAULT_DAYS
      else
        days
      end

      HOMEBREW_LOGS.subdirs.each do |dir|
        cleanup_path(dir) { dir.rmtree } if dir.prune?(logs_days)
      end
    end

    def cleanup_unreferenced_downloads
      return if dry_run?
      return unless (cache/"downloads").directory?

      downloads = (cache/"downloads").children

      referenced_downloads = [cache, cache/"Cask"].select(&:directory?)
                                                  .flat_map(&:children)
                                                  .select(&:symlink?)
                                                  .map(&:resolved_path)

      (downloads - referenced_downloads).each do |download|
        if download.incomplete?
          begin
            LockFile.new(download.basename).with_lock do
              download.unlink
            end
          rescue OperationInProgressError
            # Skip incomplete downloads which are still in progress.
            next
          end
        elsif download.directory?
          FileUtils.rm_rf download
        else
          download.unlink
        end
      end
    end

    def cleanup_cache(entries = nil)
      entries ||= [cache, cache/"Cask"].select(&:directory?).flat_map(&:children)

      entries.each do |path|
        next if path == PERIODIC_CLEAN_FILE

        FileUtils.chmod_R 0755, path if path.go_cache_directory? && !dry_run?
        next cleanup_path(path) { path.unlink } if path.incomplete?
        next cleanup_path(path) { FileUtils.rm_rf path } if path.nested_cache?

        if path.prune?(days)
          if path.file? || path.symlink?
            cleanup_path(path) { path.unlink }
          elsif path.directory? && path.to_s.include?("--")
            cleanup_path(path) { FileUtils.rm_rf path }
          end
          next
        end

        next cleanup_path(path) { path.unlink } if path.stale?(scrub: scrub?)
      end

      cleanup_unreferenced_downloads
    end

    def cleanup_path(path)
      return unless path.exist?
      return unless @cleaned_up_paths.add?(path)

      disk_usage = path.disk_usage

      if dry_run?
        puts "Would remove: #{path} (#{path.abv})"
        @disk_cleanup_size += disk_usage
      else
        puts "Removing: #{path}... (#{path.abv})"
        yield
        @disk_cleanup_size += disk_usage - path.disk_usage
      end
    end

    def cleanup_lockfiles(*lockfiles)
      return if dry_run?

      lockfiles = HOMEBREW_LOCKS.children.select(&:file?) if lockfiles.empty? && HOMEBREW_LOCKS.directory?

      lockfiles.each do |file|
        next unless file.readable?
        next unless file.open(File::RDWR).flock(File::LOCK_EX | File::LOCK_NB)

        begin
          file.unlink
        ensure
          file.open(File::RDWR).flock(File::LOCK_UN) if file.exist?
        end
      end
    end

    def cleanup_portable_ruby
      rubies = [which("ruby"), which("ruby", ENV["HOMEBREW_PATH"])].compact
      system_ruby = Pathname.new("/usr/bin/ruby")
      rubies << system_ruby if system_ruby.exist?

      use_system_ruby = if Homebrew::EnvConfig.force_vendor_ruby?
        false
      else
        check_ruby_version = HOMEBREW_LIBRARY_PATH/"utils/ruby_check_version_script.rb"
        rubies.uniq.any? do |ruby|
          quiet_system ruby, "--enable-frozen-string-literal", "--disable=gems,did_you_mean,rubyopt",
                       check_ruby_version, HOMEBREW_REQUIRED_RUBY_VERSION
        end
      end

      vendor_dir = HOMEBREW_LIBRARY/"Homebrew/vendor"
      portable_ruby_latest_version = (vendor_dir/"portable-ruby-version").read.chomp

      portable_rubies_to_remove = []
      Pathname.glob(vendor_dir/"portable-ruby/*.*").select(&:directory?).each do |path|
        next if !use_system_ruby && portable_ruby_latest_version == path.basename.to_s

        portable_rubies_to_remove << path
        puts "Would remove: #{path} (#{path.abv})" if dry_run?
      end

      return if portable_rubies_to_remove.empty?

      bundler_path = vendor_dir/"bundle/ruby"
      if dry_run?
        puts Utils.popen_read("git", "-C", HOMEBREW_REPOSITORY, "clean", "-nx", bundler_path).chomp
      else
        puts Utils.popen_read("git", "-C", HOMEBREW_REPOSITORY, "clean", "-ffqx", bundler_path).chomp
      end

      return if dry_run?

      FileUtils.rm_rf portable_rubies_to_remove
    end

    def cleanup_cache_db(rack = nil)
      FileUtils.rm_rf [
        cache/"desc_cache.json",
        cache/"linkage.db",
        cache/"linkage.db.db",
      ]

      CacheStoreDatabase.use(:linkage) do |db|
        break unless db.created?

        db.each_key do |keg|
          next if rack.present? && !keg.start_with?("#{rack}/")
          next if File.directory?(keg)

          LinkageCacheStore.new(keg, db).delete!
        end
      end
    end

    def rm_ds_store(dirs = nil)
      dirs ||= begin
        Keg::MUST_EXIST_DIRECTORIES + [
          HOMEBREW_PREFIX/"Caskroom",
        ]
      end
      dirs.select(&:directory?)
          .flat_map { |d| Pathname.glob("#{d}/**/.DS_Store") }
          .each(&:unlink)
    end

    def prune_prefix_symlinks_and_directories
      ObserverPathnameExtension.reset_counts!

      dirs = []

      Keg::MUST_EXIST_SUBDIRECTORIES.each do |dir|
        next unless dir.directory?

        dir.find do |path|
          path.extend(ObserverPathnameExtension)
          if path.symlink?
            unless path.resolved_path_exists?
              path.uninstall_info if path.to_s.match?(Keg::INFOFILE_RX) && !dry_run?

              if dry_run?
                puts "Would remove (broken link): #{path}"
              else
                path.unlink
              end
            end
          elsif path.directory? && !Keg::MUST_EXIST_SUBDIRECTORIES.include?(path)
            dirs << path
          end
        end
      end

      dirs.reverse_each do |d|
        if dry_run? && d.children.empty?
          puts "Would remove (empty directory): #{d}"
        else
          d.rmdir_if_possible
        end
      end

      return if dry_run?

      return if ObserverPathnameExtension.total.zero?

      n, d = ObserverPathnameExtension.counts
      print "Pruned #{n} symbolic links "
      print "and #{d} directories " if d.positive?
      puts "from #{HOMEBREW_PREFIX}"
    end
  end
end