require 'bake/model/loader'
require 'bake/config/checks'

module Bake

  class AdaptConfig
    attr_reader :referencedConfigs

    @@filenames = []

    def self.filenames
      @@filenames
    end

    def loadProjMeta(filename, filenum)

      Bake::Configs::Checks.symlinkCheck(filename)

      f = @loader.load(filename)

      if f.root_elements.length != 1 or not Metamodel::Adapt === f.root_elements[0]
        Bake.formatter.printError("Config file must have exactly one 'Adapt' element as root element", filename)
        ExitHelper.exit(1)
      end

      adapt = f.root_elements[0]
      configs = adapt.getConfig

      Bake::Configs::Checks::commonMetamodelCheck(configs, filename)

      configs.each do |c|
        if not c.extends.empty?
          Bake.formatter.printError("Attribute 'extends' must not be used in adapt config.",c)
          ExitHelper.exit(1)
        end
        if c.name.empty?
          Bake.formatter.printError("Configs must be named.",c)
          ExitHelper.exit(1)
        end
        if c.project.empty?
          Bake.formatter.printError("The corresponding project must be specified.",c)
          ExitHelper.exit(1)
        end
        if not ["replace", "remove", "extend"].include?c.type
          Bake.formatter.printError("Allowed types are 'replace', 'remove' and 'extend'.",c)
          ExitHelper.exit(1)
        end
      end

      configs
    end

    def getPotentialAdaptionProjects()
      potentialAdapts = []
      Bake.options.roots.each do |r|
        if (r.length == 3 && r.include?(":/"))
          r = r + Bake.options.main_project_name # glob would not work otherwise on windows (ruby bug?)
        end
        Bake.options.adapt.each do |a|
          adaptBaseName = a + "/Adapt.meta"
          potentialAdapts << adaptBaseName  if File.exists?adaptBaseName
          fn = r+"/**{,/*/**}/#{adaptBaseName}"
          potentialAdapts.concat(Dir.glob(fn).sort)
        end
      end

      potentialAdapts.uniq
    end

    def chooseProjectFilenames(potentialAdapts)
      @@filenames = []
        p potentialAdapts
      Bake.options.adapt.each do |a|
        adapts = potentialAdapts.find_all { |p| p.include?(a+"/Adapt.meta") }
        if adapts.empty?
          Bake.formatter.printError("Adaption project #{a} not found")
          ExitHelper.exit(1)
        else
          @@filenames << adapts[0]
          if (adapts.length > 1)
            Bake.formatter.printWarning("Adaption project #{a} exists more than once")
            chosen = " (chosen)"
            adapts.each do |f|
              Bake.formatter.printWarning("  #{File.dirname(f)}#{chosen}")
              chosen = ""
            end
          end
        end
      end

    end

    def load()
      @@filenames = []
      return [] if Bake.options.adapt.empty?

      @loader = Loader.new

      potentialProjects = getPotentialAdaptionProjects()
      chooseProjectFilenames(potentialProjects)

      configs = []
      @@filenames.each_with_index do |f,i|
        configs.concat(loadProjMeta(f, i+1))
      end

      return configs
    end


  end

end