# encoding: utf-8
=begin

* Name: SiSU

** Description: documents, structuring, processing, publishing, search
*** system environment, resource control and configuration details

** Author: Ralph Amissah
  [ralph@amissah.com]
  [ralph.amissah@gmail.com]

** Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
  2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Ralph Amissah,
  All Rights Reserved.

** License: GPL 3 or later:

  SiSU, a framework for document structuring, publishing and search

  Copyright (C) Ralph Amissah

  This program is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation, either version 3 of the License, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program. If not, see [http://www.gnu.org/licenses/].

  If you have Internet connection, the latest version of the GPL should be
  available at these locations:
  [http://www.fsf.org/licensing/licenses/gpl.html]
  [http://www.gnu.org/licenses/gpl.html]

** SiSU uses:
  * Standard SiSU markup syntax,
  * Standard SiSU meta-markup syntax, and the
  * Standard SiSU object citation numbering and system

** Hompages:
  [http://www.jus.uio.no/sisu]
  [http://www.sisudoc.org]

** Git
  [http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=summary]
  [http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob;f=lib/sisu/ao_hash_digest.rb;hb=HEAD]

=end
module SiSU_AO_Hash
  require_relative 'shared_markup_alt.rb'               #shared_markup_alt.rb
  class ObjectDigest
    def initialize(md,data,env=nil)
      @md,@data,@env=md,data,env
      @env ||=SiSU_Env::InfoEnv.new(@md.fns,@md)
    end
    def object_digest
    # 1. clean/stripped text without any markup, paragraph, headings etc. without endnotes
    # 2. endnotes clean/stripped text digest only (there may be several endnotes within a paragraph)
    # 3. whole object, text with markup and any endnotes, (question: with or without the endnote digests??? presumption better without, [however may be easier to check with?])
    # [digests should not include other digests]
      data=@data.compact
      @tuned_file=[]
      sha_ =@env.digest(@md.opt).type
      begin
        sha_ ? (require 'digest/sha2') : (require 'digest/md5')
      rescue LoadError
        SiSU_Utils::CodeMarker.new(__LINE__,__FILE__,:fuchsia).error(sha_ + ' NOT FOUND')
      end
      data.each do |t_o|
        unless t_o.obj.is_a?(Array)
          t_o.obj=t_o.obj.strip
        end
        if (t_o.of !=:structure \
        && t_o.of  !=:comment \
        && t_o.of  !=:layout) \
        && t_o.ocn.is_a?(Fixnum)
          case sha_
          when :sha512
            for hash_class in [ Digest::SHA512 ]
              @tuned_file << stamped(t_o,hash_class)
            end
          when :sha256
            for hash_class in [ Digest::SHA256 ]
              @tuned_file << stamped(t_o,hash_class)
            end
          when :md5
            for hash_class in [ Digest::MD5 ]
              @tuned_file << stamped(t_o,hash_class)
            end
          end
        else @tuned_file << t_o unless t_o.nil?
        end
      end
      @tuned_file=@tuned_file.flatten
      #use md5 or to create hash of each ao object including ocn, & add into to each ao object
    end
    def endnote_digest(data)
      data.each.map do |en_plus|
        case en_plus
        when /#{Mx[:en_a_o]}|#{Mx[:en_b_o]}/
          if en_plus =~/#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]}/
            t_o_txt,en_open,en_txt,en_close=
              /(.*?)(#{Mx[:en_a_o]}|#{Mx[:en_b_o]})(.+?)(#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/m.
              match(en_plus)[1..4]
            stripped_en=SiSU_TextRepresentation::Alter.new(en_txt).strip_clean_of_markup
            digest_en_strip=case @env.digest(@md.opt).type
            when :sha512
              Digest::SHA512.hexdigest(stripped_en)
            when :sha256
              Digest::SHA256.hexdigest(stripped_en)
            when :md5
              Digest::MD5.hexdigest(stripped_en)
            else
              Digest::SHA256.hexdigest(stripped_en)
            end
            t_o_txt +
              en_open +
              en_txt +
              Mx[:id_o] +
              digest_en_strip +
              Mx[:id_c] +
              en_close
          else STDERR.puts "Error Exception - problem encountered with:\n#{en_plus}" #arbitrary exception, tidy up
          end
        else en_plus
        end
      end.join
    end
    def stamped(t_o,hash_class) #decide what hash information is most useful, is compromise necessary?
      t_o.obj=SiSU_TextRepresentation::Alter.new(t_o).strip_clean_of_extra_spaces
      #SiSU_TextRepresentation::Alter.new(t_o).strip_clean_of_markup                      #check
      #SiSU_TextRepresentation::Alter.new(t_o).semi_revert_markup                         #check
      #SiSU_TextRepresentation::ModifiedTextPlusHashDigest.new(@md,t_o).composite.dgst    #check
      unless t_o.is==:code
        case t_o.obj
        when /#{Mx[:en_a_o]}[\d*+]+\s+.+?#{Mx[:en_a_c]}|#{Mx[:en_b_o]}[*+]\d+\s+.+?#{Mx[:en_b_c]}/m
          en_and_t_o_digest=[]
          t_o.obj=t_o.obj.
            gsub(/\s*(#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/m,' \1') #watch
          t_o_plus_en=t_o.obj.
            scan(/.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]}/m)
          t_o_tail=if t_o.obj =~/(?:.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]})+([\s\S]+)/m
            /(?:.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]})+.*/m.match(t_o.obj)[1]
          else ''
          end
          t_o_plus_en << t_o_tail
          en_and_t_o_digest << endnote_digest(t_o_plus_en)
          en_and_t_o_digest.join(' ')
        else #@tuned << t_o + Mx[:id_o] + digest_strip + ':' + digest_all + Mx[:id_c] unless t_o.nil?
        end
      else #@tuned << t_o + Mx[:id_o] + digest_strip + ':' + digest_all + Mx[:id_c] unless t_o.nil?
      end
      t_o #KEEP intact
    end
    def strip_clean_extra_spaces(s)                                            # ao output tuned
      s=s.dup
      s=s.gsub(/[ ]+([,.;:?](?:$|\s))/,'\1') unless s =~/#{Mx[:en_a_o]}|#{Mx[:en_b_o]}/
      s=s.gsub(/ [ ]+/,' ').
        gsub(/^ [ ]+/,'').
        gsub(/ [ ]+$/,'').
        gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2').
        gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2')
    end
  end
end
__END__