require "rake"
require "pathname"

module DtcRake
  def configure(&block)
    yield Config.instance
  end
  module_function :configure

  class Config
    include Singleton

    def initialize
      @root_dir   = Dir.pwd
      @output_dir = "target"
      @colorize   = true
      @appbox_meta_artifact_code = "UU.OS/RUNTIME/APP_BOX"
      @upload_app_descriptor = false
      guess_vendor_and_app
    end

    # Code of application. Guessed from root_dir name if not set.
    attr_accessor :app

    # Code of appbox artifact. Guessed from vendor, app and version in uuApp
    # deployment descriptor if not set.
    attr_accessor :appbox_artifact_code

    # Code of appbox location (folder or organization unit). Required.
    attr_accessor :appbox_location_code

    # Code of appbox meta artifact. Default value: UU.OS/RUNTIME/APP_BOX.
    attr_accessor :appbox_meta_artifact_code

    # Code of territory where the appbox artifact is / should be. Required.
    attr_accessor :appbox_territory_code

    # Path to uarchive with contents of appbox artifact. Default value: nil.
    # If not set, appbox is created with empty content.
    # Relative path is relative to root_dir.
    attr_accessor :appbox_uarchive

    # Path to uuApp deployment descriptor. Guessed from vendor and app if not set.
    attr_accessor :app_descriptor_path

    # Print messages in colors. Default value: true.
    attr_accessor :colorize

    # Name of folder with build products. Default value: target.
    # Relative path is relative to root_dir.
    attr_accessor :output_dir

    # Appbox project root folder. Default value: current working directory.
    attr_accessor :root_dir

    # Upload uuApp deployment descriptor to appbox artifact. Default value: false.
    attr_accessor :upload_app_descriptor

    # Code of vendor. Guessed from root_dir name if not set.
    attr_accessor :vendor

    def app=(name)
      @app = name.downcase unless name.nil?
    end

    def appbox_uarchive=(path)
      unless path.nil?
        path = File.join(root_dir, path) if Pathname.new(path).relative?
        # File.expand_path converts path to absolute and expands "~" to real user home path
        @appbox_uarchive = File.expand_path(path)
      end
    end

    def app_descriptor_path
      return @app_descriptor_path if @app_descriptor_path

      default_file_path = File.expand_path(File.join(root_dir, "#{vendor}_#{app}-uuapp-deploy.json"))

      Dir.chdir(root_dir) do
        unless File.file?(default_file_path)
          abort "uuApp deployment descriptor not found. Please create file #{default_file_path} or configure its path in Rakefile."
        end
        @app_descriptor_path = default_file_path
      end
    end

    def output_dir=(path)
      unless path.nil?
        path = File.join(root_dir, path) if Pathname.new(path).relative?
        # File.expand_path converts path to absolute and expands "~" to real user home path
        @output_dir = File.expand_path(path)
      end
    end

    def vendor=(name)
      @vendor = name.downcase unless name.nil?
    end

    private

    def guess_vendor_and_app
      base_name = File.basename(root_dir)
      if /([^_]+)_([^-]+)-appbox/ =~ base_name
        @vendor = $1
        @app = $2
      else
        abort "Appbox root folder (#{base_name}) does not match naming convention <vendor>_<app>-appbox." \
          " Either change the folder name or configure 'vendor' and 'app' in Rakefile."
      end
    end
  end
end