require_relative 'docker_command_factory_helper'
require_relative 'bundler_helper'

module Dockerun
  module CommandHelper

    # 
    # Common functions for docker container management
    #
    module DockerContainerHelper
      include DockerCommandFactoryHelper
      include BundlerHelper

      class DockerContainerBuildFailed < StandardError; end
      class DockerContainerStartFailed < StandardError; end
      class DockerContainerStopFailed < StandardError; end

      def run_docker_container(image_name, container_name, mount_points = [], &block)
     
        raise DockerContainerBuildFailed, "block is required" if not block
        raise DockerContainerBuildFailed, "Image name is required" if is_empty?(image_name)

        Dockerun.udebug("Running image '#{image_name}', container '#{container_name}'")

        reuse = nil

        if is_empty?(container_name)
          Dockerun.udebug "Container name empty. Creating new container"
          container_name = block.call(:new_container_name)
          loop do
            st, _ = is_container_exist?(container_name)
            if st
              reuse = block.call(:container_name_exist, container_name)
              break if reuse
              container_name = block.call(:new_container_name)
            else
              break
            end
          end

        else
          reuse, _ = is_container_exist?(container_name)
          Dockerun.udebug "Container name not empty. Is container exist? : #{reuse}"
          #if st
          #  reuse = true
          #else
          #  # if not found shall drop into the next block's else clause 
          #end
        end

        if reuse == true
        
          Dockerun.udebug "Find out of container '#{container_name}' is running..." 
          #res = dcFact.find_running_container(container_name).run
          #if not res.failed? and res.is_out_stream_empty?
          st, _ = is_container_running?(container_name)
          if not st
            # not running
            Dockerun.udebug "Container '#{container_name}' does not seems to be running. Starting container."
            ress = dcFact.start_container(container_name).run
            raise DockerContainerStartFailed, "Failed to start container '#{container_name}'. Error was : #{ress.err_stream}" if ress.failed?
          end

          ucmd = cli.ask("Command to be run inside the container. Empty to attach to existing session : ", value: "/bin/bash")
          if is_empty?(ucmd)
            dcFact.attach_container(container_name).run
          else
            dcFact.run_command_in_running_container(container_name, ucmd, tty: true, interactive: true).run
          end

        else

          #@workspace_root = "/opt"
          #@shared_dirs = {}

          #mount = []
          #sharedInsideDocker = []
          #res = find_local_dev_gems
          #puts "Found #{res.length} local gems #{res}"
          #if not res.empty?
          #  
          #  transferMapping = block.call(:transfer_dev_gem_mapping?)
          #  if transferMapping
          #    res.each do |name, path|
          #      tsrc = block.call(:workspace_root_inside_docker, @workspace_root, name, path)
          #      inPath = File.join(tsrc, name)
          #      mount << { path => inPath }
          #      @shared_dirs[name] = inPath 
          #    end
          #  end

          #end

          #mapProjectDir = block.call(:map_project_dir, @workspace_root)
          #if not_empty?(mapProjectDir)
          #  mount << { Dir.getwd => mapProjectDir }
          #end

          #reqVolMap = block.call(:volume_mapping_required?)
          #if reqVolMap

          #  loop do
          #    
          #    block.call(:already_mapped, mount)

          #    src = block.call(:source_prompt)
          #    dest = block.call(:destination_prompt, src)
          #    mount << { src => dest }
          #    
          #    add_to_bundle = block.call(:add_to_bundle?, dest)
          #    if add_to_bundle
          #      @shared_dirs[File.basename(dest)] = dest
          #    end

          #    block.call(:add_mount_to_container, container_name, mount.last)
          #    repeat = block.call(:add_more_volume_mapping?)
          #    break if not repeat

          #  end

          #end


          #insideDockerConfig = File.join(File.dirname(__FILE__),"..","..","template","setup_ruby_devenv.rb.erb")
          #if File.exist?(insideDockerConfig)
          #  
          #  @docker_init_file_path = File.join(Dir.getwd,"on_docker_config")

          #  cont = File.read(insideDockerConfig)
          #  
          #  b = binding

          #  res = ERB.new(cont)
          #  out = res.result(b)

          #  # fixed this name to be used inside Dockerfile 
          #  File.open(@docker_init_file_path, "w") do |f|
          #    f.write out
          #  end

          #  block.call(:on_docker_init_file_path,@docker_init_file_path) 

          #end



          dcFact.create_container_from_image(image_name, interactive: true, tty: true, container_name: container_name, mount: mount_points).run

        end

        container_name

      end

      private
      def is_container_exist?(name)
        if not_empty?(name)
          res = dcFact.find_from_all_container("^#{name}\\z").run
          raise DockerContainerBuildFailed, "Failed to find container. Error was : #{res.err_stream}" if res.failed?

          if res.is_out_stream_empty?
            # nothing found
            [false, ""]
          else
            [true, res.out_stream]
          end
        else
          [false, nil]
        end
      end

      def run_container(name)

        res = dcFact.start_container(name)
        raise DockerContainerStartFailed, "Failed to start docker container name '#{name}'. Error was : #{res.err_stream}" if res.failed?

      end

      def is_container_running?(name)
        if not_empty?(name)
          res = dcFact.find_running_container("^#{name}\\z").run
          raise DockerContainerBuildFailed, "Failed to find is running container. Error was : #{res.err_stream}" if res.failed?

          if res.is_out_stream_empty?
            # nothing found
            [false, ""]
          else
            [true, res.out_stream]
          end
        else
          [false, nil]
        end
      end

      def stop_container(name)
        res = dcFact.stop_container(name).run
        raise DockerContainerStopFailed, "Failed to stop docker container '#{name}'. Error was : #{res.err_stream}" if res.failed?
      end

      
    end
  end
end