require 'common/exit_helper'
require 'bake/toolchain/colorizing_formatter'
require 'common/options/parser'
require 'common/version'
require 'adapt/config/loader'

module Bake

  class Cache
    attr_accessor :referencedConfigs
    attr_accessor :files # project_files
    attr_accessor :cache_file
    attr_accessor :version
    attr_accessor :workspace_roots
    attr_accessor :include_filter
    attr_accessor :exclude_filter
    attr_accessor :no_autodir
    attr_accessor :build_config
    attr_accessor :adapt_filenames
  end

  class CacheAccess
      attr_reader :cacheFilename

      def initialize()
        if Bake.options.build_config == ""
          @cacheFilename = Bake.options.main_dir+"/.bake/Default.Project.meta.cache"
        else
          @cacheFilename = Bake.options.main_dir+"/.bake/Project.meta." + sanitize_filename(Bake.options.build_config) + ".cache"
        end

        FileUtils.mkdir_p(File.dirname(@cacheFilename))
      end

      def load_cache
        cache = nil
        begin
          allFiles = Dir.glob(File.dirname(@cacheFilename)+"/*.cache")
          if allFiles.include?(@cacheFilename)
            cacheTime = File.mtime(@cacheFilename)
            contents = File.open(@cacheFilename, "rb") {|io| io.read }
            cache = Marshal.load(contents)

            if cache.version != Version.number
              Bake.formatter.printInfo("Info: cache version ("+cache.version+") does not match to bake version ("+Version.number+"), reloading meta information")
              cache = nil
            end

            if cache != nil
              if cache.cache_file != @cacheFilename
                Bake.formatter.printInfo("Info: cache filename changed, reloading meta information")
                cache = nil
              end
            end

            if cache != nil
              cache.files.each do |c|
                if (not File.exists?(c))
                  Bake.options.nocache = true
                  Bake.formatter.printInfo("Info: cached meta file #{c} renamed or deleted, reloading meta information")
                  cache = nil
                  break
                end
              end
            end

            if cache != nil
              cache.referencedConfigs.each do |pname,configs|
                configs.each do |config|
                  if not File.exists?(config.file_name)
                    Bake.options.nocache = true
                    Bake.formatter.printInfo("Info: cached meta file #{config.file_name} renamed or deleted, reloading meta information")
                    cache = nil
                  end
                end
              end
            end

            if cache != nil
              cache.files.each do |c|
                if File.mtime(c) > cacheTime + 1
                  Bake.formatter.printInfo("Info: #{c} has been changed, reloading meta information")
                  cache = nil
                  break
                end
              end
            end

            if (cache != nil)
              if (not AdaptConfig.filenames.eql?(cache.adapt_filenames))
                Bake.formatter.printInfo("Info: adapt config filenames have been changed, reloading meta information")
                cache = nil
              end
            end

            if (cache != nil and not AdaptConfig.filenames.empty?)
              AdaptConfig.filenames.each do |f|
                adaptTime = File.mtime(f)
                if adaptTime > cacheTime + 1
                  Bake.formatter.printInfo("Info: #{f} has been changed, reloading meta information")
                  cache = nil
                end
              end
            end

            if cache != nil
              if cache.workspace_roots.length == Bake.options.roots.length
                cache.workspace_roots.each do |r|
                  if not Bake.options.roots.include?r
                    cache = nil
                    break
                  end
                end
              else
                cache = nil
              end
              Bake.formatter.printInfo("Info: specified roots differ from cached roots, reloading meta information") if cache.nil?
            end

            if cache != nil
              if (not Bake.options.include_filter.eql?(cache.include_filter)) or (not Bake.options.exclude_filter.eql?(cache.exclude_filter))
                cache = nil
                Bake.formatter.printInfo("Info: specified filters differ from cached filters, reloading meta information")
              end
            end

            if cache != nil
              if (not Bake.options.no_autodir.eql?(cache.no_autodir))
                cache = nil
                Bake.formatter.printInfo("Info: no_autodir option differs in cache, reloading meta information")
              end
            end

          else
            Bake.formatter.printInfo("Info: cache not found, reloading meta information")
          end
        rescue Exception => e
          Bake.formatter.printWarning("Warning: cache file corrupt, reloading meta information (cache might be written by an older bake version)")
          if Bake.options.debug
            puts e.message
            puts e.backtrace
          end
          cache = nil
        end

        if cache != nil
          Bake.formatter.printInfo("Info: cache is up-to-date, loading cached meta information") if Bake.options.verbose >= 3
          Bake.options.build_config = cache.build_config if Bake.options.build_config == ""
          return cache.referencedConfigs
        end

        return nil
      end

      def write_cache(project_files, referencedConfigs)
        cache = Cache.new
        cache.referencedConfigs = referencedConfigs
        cache.files = project_files
        cache.cache_file = @cacheFilename
        cache.version = Version.number
        cache.include_filter = Bake.options.include_filter
        cache.no_autodir = Bake.options.no_autodir
        cache.exclude_filter = Bake.options.exclude_filter
        cache.workspace_roots = Bake.options.roots
        cache.build_config = Bake.options.build_config
        cache.adapt_filenames = AdaptConfig.filenames
        bbdump = Marshal.dump(cache)
        begin
          File.delete(@cacheFilename)
        rescue
        end
        File.open(@cacheFilename, 'wb') {|file| file.write(bbdump) }
        Bake.options.nocache = false
      end

  end


end