# typed: strict
# frozen_string_literal: true

require "timeout"
require "cask/download"
require "cask/installer"
require "cask/cask_loader"
require "system_command"
require "tap"
require "unversioned_cask_checker"

module Homebrew
  module DevCmd
    class BumpUnversionedCasks < AbstractCommand
      include SystemCommand::Mixin

      cmd_args do
        description <<~EOS
          Check all casks with unversioned URLs in a given <tap> for updates.
        EOS
        switch "-n", "--dry-run",
               description: "Do everything except caching state and opening pull requests."
        flag   "--limit=",
               description: "Maximum runtime in minutes."
        flag   "--state-file=",
               description: "File for caching state."

        named_args [:cask, :tap], min: 1, without_api: true
      end

      sig { override.void }
      def run
        Homebrew.install_bundler_gems!(groups: ["bump_unversioned_casks"])

        state_file = if args.state_file.present?
          Pathname(T.must(args.state_file)).expand_path
        else
          HOMEBREW_CACHE/"bump_unversioned_casks.json"
        end
        state_file.dirname.mkpath

        state = state_file.exist? ? JSON.parse(state_file.read) : {}

        casks = args.named.to_paths(only: :cask, recurse_tap: true).map { |path| Cask::CaskLoader.load(path) }

        unversioned_casks = casks.select do |cask|
          cask.url&.unversioned? && !cask.livecheck_defined?
        end

        ohai "Unversioned Casks: #{unversioned_casks.count} (#{state.size} cached)"

        checked, unchecked = unversioned_casks.partition { |c| state.key?(c.full_name) }

        queue = Queue.new

        # Start with random casks which have not been checked.
        unchecked.shuffle.each do |c|
          queue.enq c
        end

        # Continue with previously checked casks, ordered by when they were last checked.
        checked.sort_by { |c| state.dig(c.full_name, "check_time") }.each do |c|
          queue.enq c
        end

        limit = args.limit.presence&.to_i
        end_time = Time.now + (limit * 60) if limit

        until queue.empty? || (end_time && end_time < Time.now)
          cask = queue.deq

          key = cask.full_name

          new_state = bump_unversioned_cask(cask, state: state.fetch(key, {}))

          next unless new_state

          state[key] = new_state

          state_file.atomic_write JSON.pretty_generate(state) unless args.dry_run?
        end
      end

      private

      sig {
        params(cask: Cask::Cask, state: T::Hash[String, T.untyped])
          .returns(T.nilable(T::Hash[String, T.untyped]))
      }
      def bump_unversioned_cask(cask, state:)
        ohai "Checking #{cask.full_name}"

        unversioned_cask_checker = UnversionedCaskChecker.new(cask)

        if !unversioned_cask_checker.single_app_cask? &&
           !unversioned_cask_checker.single_pkg_cask? &&
           !unversioned_cask_checker.single_qlplugin_cask?
          opoo "Skipping, not a single-app or PKG cask."
          return
        end

        last_check_time = state["check_time"]&.then { |t| Time.parse(t) }

        check_time = Time.now
        if last_check_time && (check_time - last_check_time) / 3600 < 24
          opoo "Skipping, already checked within the last 24 hours."
          return
        end

        last_sha256 = state["sha256"]
        last_time = state["time"]&.then { |t| Time.parse(t) }
        last_file_size = state["file_size"]

        download = Cask::Download.new(cask)
        time, file_size = begin
          download.time_file_size
        rescue
          [nil, nil]
        end

        if last_time != time || last_file_size != file_size
          sha256 = begin
            Timeout.timeout(5 * 60) do
              unversioned_cask_checker.installer.download.sha256
            end
          rescue => e
            onoe e

            nil
          end

          if sha256.present? && last_sha256 != sha256
            version = begin
              Timeout.timeout(60) do
                unversioned_cask_checker.guess_cask_version
              end
            rescue Timeout::Error
              onoe "Timed out guessing version for cask '#{cask}'."

              nil
            end

            if version
              if cask.version == version
                oh1 "Cask #{cask} is up-to-date at #{version}"
              else
                bump_cask_pr_args = [
                  "bump-cask-pr",
                  "--version", version.to_s,
                  "--sha256", ":no_check",
                  "--message", "Automatic update via `brew bump-unversioned-casks`.",
                  cask.sourcefile_path
                ]

                if args.dry_run?
                  bump_cask_pr_args << "--dry-run"
                  oh1 "Would bump #{cask} from #{cask.version} to #{version}"
                else
                  oh1 "Bumping #{cask} from #{cask.version} to #{version}"
                end

                begin
                  system_command! HOMEBREW_BREW_FILE, args: bump_cask_pr_args
                rescue ErrorDuringExecution => e
                  onoe e
                end
              end
            end
          end
        end

        {
          "sha256"     => sha256,
          "check_time" => check_time.iso8601,
          "time"       => time&.iso8601,
          "file_size"  => file_size,
        }
      end
    end
  end
end