module Execute


end


require 'rubygems'
require 'ostruct'

# dat execute progress
# dat execute                   < default Configfile
# dat execute --dry-run
# Execute single command
# dat command service zulip

module Execute
  attr_accessor :options

  def context(new_value = nil)
    @options = new_value
  end

  class ServiceInstallContext
    attr_accessor :bin_dir, :data_dir, :version, :user_name, :forced
    
    def initialize(bin_dir, data_dir, user_name, version, forced = false)
      @bin_dir = bin_dir
      @data_dir = data_dir
      @user_name = user_name
      @version = version
      @forced = forced
    end
  end
  
  class UserInstallContext
    attr_accessor :user_name, :type, :can_login

    def initialize(user_name, type = :user, can_login = nil) 
      @user_name = user_name
      @type = type
      
      if can_login == nil 
        case type
        when :service
        @can_login = false
        when :user
        @can_login = true
        else
        raise "Can not create user for type: #{type}"
        end
      else
        @can_login = can_login 
      end
    end
  end

  def dependency(name)
    puts "Checking for #{name}..."

    unless gem_installed?(name)
      puts "Installing #{name}..."
      system("gem install #{name}")
    else
      puts "#{name} is already installed."
    end

    require name
  rescue LoadError => e
    puts "Failed to load #{name}: #{e.message}"
  end

  def gem_installed?(name)
    Gem::Specification::find_all_by_name(name).any?
  end

  def get_install_executor(name)
    require 'make'
    pdata = Make.context(name)
    bin_dir = pdata.get_prefix
    data_dir = "/data/#{pdata.name}/#{pdata.version.split(".").first}" 
    service_install_context = ServiceInstallContext.new(
      bin_dir, data_dir, name, pdata.version, @options.forced
    )

    case name
    when :postgresql
    require 'setup/postgresql'
    -> { Setup::PostgreSQL.install(service_install_context) }
    # ->(context) { 
    #   Setup::PostgreSQL.install(context) 
    # }
    else
    raise "Can't find the executor"
    end
  end

  def execute_with_context(context)

  end
  # def postgres
  #   require 'setup/postgresql'
  #   Setup::PostgreSQL.install
  # end

  def service(name)
    executor = get_install_executor(name)
    #executor.call(service_install_context)
    executor.call
    exit -1

    if block_given?
      context = OpenStruct.new
      # service context
      output = yield context
      puts output
      puts "context: #{context}"
    else
      puts "No block provided"
    end
  end

  def user(*users)
    require 'user'
    users.each do |name|
      context = UserInstallContext.new(name, :user)
      User.install(context)
    end
  end

  def install(*packages) 
    packages.each do |pkg|
      puts "Installing #{pkg}"
    end
  end

  def self.file(options)
    dsl = Object.new
    dsl.extend(Execute)
    dsl.options = options
    
    # Configfile
    path = File.join(Dir.pwd, options.name || "./Configfile")
    dsl.instance_eval(File.read(path), path)
  end
end