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module sdp.meta.metadoc;
template SiSUabstraction() {
  import
    std.getopt,
    std.file,
    std.path,
    std.process;
  import
    sdp.meta,
    sdp.meta.metadoc_summary,
    sdp.meta.metadoc_from_src,
    sdp.meta.conf_make_meta_structs,
    sdp.meta.conf_make_meta_toml,
    sdp.meta.conf_make_meta_json,
    sdp.meta.defaults,
    sdp.meta.doc_debugs,
    sdp.meta.rgx,
    sdp.source.paths_source,
    sdp.source.read_config_files,
    sdp.source.read_source_files,
    sdp.output.hub;
  mixin SiSUrgxInit;
  mixin contentJSONtoSiSUstruct;
  mixin SiSUbiblio;
  mixin SiSUrgxInitFlags;
  mixin outputHub;
  enum headBody { header, body_content, insert_file_list, image_list }
  enum makeMeta { make, meta }
  enum docAbst  { doc_abstraction, section_keys, segnames, segnames_0_4, images }
  static auto rgx = Rgx();
  auto SiSUabstraction(E,O,M)(
    E _env,
    O _opt_action,
    M _manifest
  ){
    auto _config_document_struct = readConfigDoc!()(_manifest, _env);    // document config file
    auto _config_local_site_struct = readConfigSite!()(_manifest, _env); // local site config
    ConfCompositePlus _make_and_meta_struct;
    _make_and_meta_struct = configParseTOMLreturnSiSUstruct!()(_make_and_meta_struct, _config_document_struct);
    _make_and_meta_struct = configParseTOMLreturnSiSUstruct!()(_make_and_meta_struct, _config_local_site_struct);
    /+ ↓ read file (filename with path) +/
    /+ ↓ file tuple of header and content +/
    debug(steps) {
      writeln("step1 commence → (get document header & body & insert file list & if needed image list)"
      );
    }
    auto _header_body_insertfilelist_imagelist
      = SiSUrawMarkupContent!()(_opt_action, _manifest.src.path_and_fn);
    static assert(!isTypeTuple!(_header_body_insertfilelist_imagelist));
    static assert(_header_body_insertfilelist_imagelist.length==4);
    debug(steps) {
      writeln("- step1 complete");
    }
    debug(header_and_body) {
      writeln(header);
      writeln(_header_body_insertfilelist_imagelist.length);
      writeln(_header_body_insertfilelist_imagelist.length[headBody.body_content][0]);
    }
    /+ ↓ split header into make and meta +/
    debug(steps) {
      writeln("step2 commence → (read document header - toml, return struct)");
    }
    _make_and_meta_struct =
    docHeaderMakeAndMetaTupTomlExtractAndConvertToStruct!()(
      _make_and_meta_struct,
      _header_body_insertfilelist_imagelist[headBody.header]
    );
    debug(steps) {
      writeln("- step2 complete");
    }
    /+ ↓ document abstraction: process document, return abstraction as tuple +/
    debug(steps) {
      writeln("step3 commence → (document abstraction (da); da keys; segnames; doc_matters)");
    }
    auto da = SiSUdocAbstraction!()(
      _header_body_insertfilelist_imagelist[headBody.body_content],
      _make_and_meta_struct,
      _opt_action,
      _manifest,
      true,
    );
    static assert(!isTypeTuple!(da));
    static assert(da.length==5);
    auto doc_abstraction = da[docAbst.doc_abstraction]; /+ head ~ toc ~ body ~ endnotes_seg ~ glossary ~ bibliography ~ bookindex ~ blurb; +/
    auto _document_section_keys_sequenced = da[docAbst.section_keys];
    string[] _doc_html_segnames = da[docAbst.segnames];
    string[] _doc_epub_segnames_0_4 = da[docAbst.segnames_0_4];
    auto _images = da[docAbst.images];
    debug(steps) {
      writeln("- step3 complete");
    }
    debug(steps) {
      writeln("step4 commence → (doc_matters)");
    }
    struct DocumentMatters {
      auto conf_make_meta() { // TODO meld with all make instructions
        return _make_and_meta_struct;
      }
      auto env() {
        struct Env_ {
          auto pwd() {
            return _manifest.env.pwd;
          }
          auto home() {
            return _manifest.env.home;
          }
        }
        return Env_();
      }
      auto opt() {
        struct Opt_ {
          auto action() {
            /+ getopt options, commandline instructions, raw
             - processing instructions --epub --html etc.
             - command line config instructions --output-path
            +/
            return _opt_action;
          }
        }
        return Opt_();
      }
      auto src() {
        return _manifest.src;
      }
      auto src_path_info() {
        return SiSUpathsSRC!()(_manifest.env.pwd, _manifest.src.file_with_absolute_path); // would like (to have and use) relative path
      }
      auto srcs() {
        struct SRC_ {
          auto file_insert_list() {
            return _header_body_insertfilelist_imagelist[headBody.insert_file_list];
          }
          auto image_list() {
            return _images;
          }
        }
        return SRC_();
      }
      auto pod() {
        return _manifest.pod;
      }
      auto sqlite() {
        struct SQLite_ {
          string filename() {
            return _opt_action.sqlite_filename;
          }
        }
        return SQLite_();
      }
      auto xml() {
        struct XML_ {
          auto keys_seq() {
            /+ contains .seg & .scroll sequences +/
            return _document_section_keys_sequenced;
          }
          string[] segnames() {
            return _doc_html_segnames;
          }
          string[] segnames_lv_0_to_4() {
            return _doc_epub_segnames_0_4;
          }
        }
        return XML_();
      }
      auto output_path() {
        return _manifest.output.path;
      }
    }
    auto doc_matters = DocumentMatters();
    debug(steps) {
      writeln("- step4 complete");
    }
    auto t = tuple(doc_abstraction, doc_matters);
    static assert(t.length==2);
    return t;
  }
}