# frozen_string_literal: true

require 'eac_ruby_utils/simple_cache'
require 'avm/git/launcher/sub_warp_base'
require 'avm/launcher/errors/base'
require 'avm/launcher/paths/real'
require 'avm/git/vendor/github'

module Avm
  module Projects
    module Stereotypes
      class GitSubrepo
        class Warp < ::Avm::Launcher::Paths::Real
          include ::Avm::Git::Launcher::SubWarpBase
          include ::EacRubyUtils::SimpleCache

          attr_reader :instance

          def initialize(instance)
            @instance = instance
            check_parent
            init_aux
            push_to_aux
            reset
            assert_target_remote
            super(warped_git)
          end

          private

          def check_parent
            return if parent_git_warped.rev_parse(subrepo_parent_hash) &&
                      parent_git_warped.descendant?('HEAD', subrepo_parent_hash)

            raise Avm::Launcher::Errors::Base,
                  "Subrepo parent hash \"#{subrepo_parent_hash}\"" \
                  " not found in \"#{parent_git_warped}\""
          end

          def subrepo_parent_hash
            data = parent_git_warped.subrepo_status(to_parent_git_path)
            h = data['Pull Parent']
            return h if h.present?

            raise Avm::Launcher::Errors::Base, "Subrepo parent hash is blank: #{data}"
          end

          def init_aux
            ::Avm::Git::Launcher::Base.new(aux_path).init_bare
          end

          def parent_git_warped_uncached
            ::Avm::Git::Launcher::Base.new(parent_instance.warped)
          end

          def aux_path
            instance.cache_path('subrepo_aux_git_repository')
          end

          def warped_git_uncached
            ::Avm::Git::Launcher::Base.new(instance.cache_path('git_repository'))
          end

          def push_to_aux
            parent_git_warped.execute!('subrepo', 'branch', to_parent_git_path, '-fF')
            h = parent_git_warped.rev_parse("subrepo/#{to_parent_git_path}", true)
            parent_git_warped.execute!('push', aux_path, "#{h}:refs/heads/master", '--force')
          end

          def reset
            ::Avm::Git::Launcher::MirrorUpdate.new(warped_git, aux_path, 'master')
          end

          def assert_target_remote
            warped_git.assert_remote_url(::Avm::Git::Launcher::WarpBase::TARGET_REMOTE,
                                         target_remote_url)
          end

          def target_remote_url
            ::Avm::Git::Vendor::Github.to_ssh_url(
              parent_git_warped.subrepo_remote_url(to_parent_git_path)
            )
          end
        end
      end
    end
  end
end