# frozen_string_literal: true

#--
# Yast rake
#
# Copyright (C) 2021 SUSE LLC
#   This library is free software; you can redistribute it and/or modify
# it only under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
#   This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
#   You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#++

require_relative "github_actions/github_actions"

# Run a client in Docker container
class ContainerRunner
  include GithubActions::Colorizer

  # start a container, copy the sources there and run "rake run"
  # @param client [String,nil] the client name, nil or empty string = find
  #   the client automatically
  def run(client)
    container = find_container
    container.pull
    container.start
    container.copy_current_dir

    cmd = client ? "rake run[#{client}]" : "rake run"
    container.run(cmd)

    container.stop
  end

private

  # find the Docker image to use in the container
  # @return [String] the image name
  def find_container
    # explicitly requested image
    image = ENV["DOCKER_IMAGE"]
    return GithubActions::Container.new(image) if image && !image.empty?

    # scan the Docker images used in the GitHub Actions
    containers = workflow_containers
    return containers.first if containers.size == 1

    if containers.empty?
      error("No Docker image was found in the GitHub Actions")
      puts "Use DOCKER_IMAGE=<name> option for specifying the image name"
      abort
    end

    # multiple images found
    error("Found multiple Docker images in the GitHub Actions:")
    error(containers.map { |c| [c.image, c.options] })
    puts "Use DOCKER_IMAGE=<name> option for specifying the image name"
    puts "and DOCKER_OPTIONS=<options> option for specifying the extra Docker"
    puts "command line parameters."
    abort
  end

  # extract the Docker images from the GitHub Actions,
  # the duplicates are removed
  # @return [Array<GithubActions::Container>] image names
  def workflow_containers
    ret = GithubActions::Workflow.read.each_with_object([]) do |workflow, containers|
      workflow.jobs.each do |job|
        container_data = job.container

        case container_data
        when String
          containers << GithubActions::Container.new(container_data)
        when Hash
          # to_s converts missing options (nil) to empty options ("")
          # to treat these as equal in comparison
          containers << GithubActions::Container.new(
            container_data["image"],
            container_data["options"].to_s
          )
        else
          abort "Unsupported container definition: #{container_data.inspect}"
        end
      end
    end

    ret.uniq { |c| [c.image, c.options] }
  end
end