module Docktor
  class DockerClient
    CONTAINER_NAME_PREFIX = "docktor_"

    def container_exists?(container)
      `docker ps --all --quiet --filter name=#{container_name(container.name)}`.present?
    end

    def run(container)
      `docker run --name #{container_name(container.name)} #{parse_options(container.options)} #{container.image} #{container.command}`
    end

    def start(container)
      `docker start #{container_name(container.name)}`
    end

    private

    def parse_options(options)
      options.map do |name, value|
        case name
        when :detach then "--detach=#{value}"
        when :volumes then "--volume #{value.join(" ")}"
        when :ports then "--publish #{value.join(" ")}"
        when :links
          value.map { |v| "--link #{container_name(v)}" }.join(" ")
        when :environment
          "--env #{value.map { |k, v| %(#{k}="#{v}") }.join(" ")}"
        end
      end.join(" ").strip
    end

    def container_name(name)
      CONTAINER_NAME_PREFIX + name
    end
  end
end