public class Wdata_itemByTitle_page implements Xows_page {
  private Xoa_url_arg_hash arg_hash = new Xoa_url_arg_hash();
  private static final byte[] Arg_site = Bry_.new_a7("site"), Arg_page = Bry_.new_a7("page");

  public Bry_fmtr Html_fmtr() {
    return html_fmtr;
  }

  private Wdata_itemByTitle_cfg cfg;

  public Xows_special_meta Special_meta() {
    return Xows_special_meta_.Itm__item_by_title;
  }

  public void Special_gen(Xowe_wiki wiki, Xoae_page page, Xoa_url url, Xoa_ttl ttl) {
    if (cfg == null)
      cfg =
          (Wdata_itemByTitle_cfg) wiki.Appe().Special_mgr().Get_or_null(Wdata_itemByTitle_cfg.Key);
    // Special:ItemByTitle/enwiki/Earth -> www.wikidata.org/wiki/Q2
    Gfo_usr_dlg usr_dlg = wiki.Appe().Usr_dlg();
    byte[] site_bry = cfg.Site_default();
    byte[] page_bry = Bry_.Empty;
    byte[] raw_bry = ttl.Full_txt_wo_qarg(); // EX: enwiki/Earth
    int args_len = url.Args().length;
    if (args_len > 0) {
      arg_hash.Load(url);
      site_bry = arg_hash.Get_val_bry_or(Arg_site, Bry_.Empty);
      page_bry = arg_hash.Get_val_bry_or(Arg_page, Bry_.Empty);
    }
    int site_bgn = Bry_finder.Find_fwd(raw_bry, Xoa_ttl.Subpage_spr);
    if (site_bgn != Bry_.NotFound) { // leaf arg is available
      int page_bgn = Bry_finder.Find_fwd(raw_bry, Xoa_ttl.Subpage_spr, site_bgn + 1);
      int raw_bry_len = raw_bry.length;
      if (page_bgn != Bry_.NotFound
          && page_bgn < raw_bry_len) { // pipe is found and not last char (EX: "enwiki/" is invalid
        site_bry = Bry_.Mid(raw_bry, site_bgn + 1, page_bgn);
        page_bry = Bry_.Mid(raw_bry, page_bgn + 1, raw_bry_len);
      }
    }
    Xoae_app app = wiki.Appe();
    if (Bry_.Len_gt_0(site_bry) && Bry_.Len_gt_0(page_bry))
      if (Navigate(usr_dlg, app, app.Wiki_mgr().Wdata_mgr(), page, site_bry, page_bry)) return;
    Bry_bfr tmp_bfr = wiki.Utl__bfr_mkr().Get_k004();
    html_fmtr.Bld_bfr_many(
        tmp_bfr,
        "Search for items by site and title",
        "Site",
        site_bry,
        "Page",
        page_bry,
        "Search");
    page.Data_raw_(tmp_bfr.To_bry_and_rls());
    page.Html_data().Html_restricted_n_(); // [[Special:]] pages allow all HTML
  }

  private static boolean Navigate(
      Gfo_usr_dlg usr_dlg,
      Xoae_app app,
      Wdata_wiki_mgr wdata_mgr,
      Xoae_page page,
      byte[] site_bry,
      byte[] page_bry) {
    page_bry =
        Xoa_app_.Utl__encoder_mgr()
            .Http_url()
            .Decode(page_bry); // NOTE: space is converted to + on postback to url; decode
    byte[] wiki_domain = Xow_wiki_alias.Parse_wmf_key(site_bry);
    if (wiki_domain == null) {
      usr_dlg.Warn_many("", "", "site_bry parse failed; site_bry:~{0}", String_.new_u8(site_bry));
      return false;
    }
    Xowe_wiki wiki = app.Wiki_mgr().Get_by_key_or_make(wiki_domain);
    if (wiki == null) {
      usr_dlg.Warn_many(
          "", "", "wiki_domain does not exist; wiki_domain:~{0}", String_.new_u8(wiki_domain));
      return false;
    }
    Xoa_ttl wdata_ttl = Xoa_ttl.parse_(wiki, page_bry);
    if (wdata_ttl == null) {
      usr_dlg.Warn_many("", "", "ttl is invalid; ttl:~{0}", String_.new_u8(page_bry));
      return false;
    }
    Wdata_doc doc = wdata_mgr.Pages_get(wiki, wdata_ttl);
    if (doc == null) {
      usr_dlg.Warn_many(
          "", "", "ttl cannot be found in wikidata; ttl:~{0}", String_.new_u8(wdata_ttl.Raw()));
      return false;
    }
    byte[] qid_bry = doc.Qid();
    Xoae_page qid_page = wdata_mgr.Wdata_wiki().Data_mgr().Redirect(page, qid_bry);
    if (qid_page.Missing()) {
      usr_dlg.Warn_many(
          "", "", "qid cannot be found in wikidata; qid:~{0}", String_.new_u8(qid_bry));
      return false;
    }
    return true;
  }

  private static Bry_fmtr html_fmtr =
      Bry_fmtr.new_(
          String_.Concat_lines_nl(
              "<div id=\"mw-content-text\">",
              "<form method=\"get\" action=\"//www.wikidata.org/wiki/Special:ItemByTitle\" name=\"itembytitle\" id=\"wb-itembytitle-form1\">",
              "<fieldset>",
              "<legend>~{legend}</legend>",
              "<label for=\"wb-itembytitle-sitename\">~{site_lbl}:</label>",
              "<input id=\"wb-itembytitle-sitename\" size=\"12\" name=\"site\" value=\"~{site_val}\" accesskey=\"s\" />",
              "",
              "<label for=\"pagename\">~{page_lbl}:</label>",
              "<input id=\"pagename\" size=\"36\" class=\"wb-input-text\" name=\"page\" value=\"~{page_val}\" accesskey=\"p\" />",
              "",
              "<input id=\"wb-itembytitle-submit\" class=\"wb-input-button\" type=\"submit\" value=\"~{search_lbl}\" name=\"submit\" />",
              "</fieldset>",
              "</form>",
              "</div>",
              "<br>To change the default site, see <a href='/site/home/wiki/Help:Options/Wikibase'>Help:Options/Wikibase</a>"),
          "legend",
          "site_lbl",
          "site_val",
          "page_lbl",
          "page_val",
          "search_lbl");
}
  private void Write_page_by_tid(
      Xop_ctx ctx,
      Xoh_wtr_ctx hctx,
      byte html_gen_tid,
      Bry_bfr bfr,
      Bry_fmtr fmtr,
      byte[] page_data) {
    // if custom_html, use it and exit; needed for Default_tab
    byte[] custom_html = page.Html_data().Custom_html();
    if (custom_html != null) {
      bfr.Add(custom_html);
      return;
    }
    // temp variables
    if (root_dir_bry == null) this.root_dir_bry = app.Fsys_mgr().Root_dir().To_http_file_bry();
    Xoa_ttl page_ttl = page.Ttl();
    int page_ns_id = page_ttl.Ns().Id();
    byte page_tid = Xow_page_tid.Identify(wiki.Domain_tid(), page_ns_id, page_ttl.Page_db());
    DateAdp modified_on = page.Db().Page().Modified_on();
    byte[] modified_on_msg =
        wiki.Msg_mgr()
            .Val_by_id_args(
                Xol_msg_itm_.Id_portal_lastmodified,
                modified_on.XtoStr_fmt_yyyy_MM_dd(),
                modified_on.XtoStr_fmt_HHmm());
    byte[] page_body_class = Xoh_page_body_cls.Calc(tmp_bfr, page_ttl, page_tid);
    byte[] html_content_editable =
        wiki.Gui_mgr().Cfg_browser().Content_editable() ? Content_editable_bry : Bry_.Empty;
    byte[] page_content_sub = Xoh_page_wtr_wkr_.Bld_page_content_sub(app, wiki, page, tmp_bfr);
    byte[] js_edit_toolbar_bry =
        html_gen_tid == Xopg_page_.Tid_edit
            ? wiki.Fragment_mgr().Html_js_edit_toolbar()
            : Bry_.Empty;
    Xol_vnt_mgr vnt_mgr = wiki.Lang().Vnt_mgr();
    if (vnt_mgr.Enabled()) {
      byte[] converted_title = vnt_mgr.Convert_lang().Converted_title(); // prefer converted title
      if (converted_title
          == null) // converted title does not exist; use regular page title and convert it
      converted_title = vnt_mgr.Convert_lang().Auto_convert(vnt_mgr.Cur_itm(), page_ttl.Page_txt());
      page_ttl = Xoa_ttl.Parse(wiki, page_ttl.Ns().Id(), converted_title);
    }
    byte[] page_name =
        Xoh_page_wtr_wkr_.Bld_page_name(
            tmp_bfr, page_ttl,
            null); // NOTE: page_name does not show display_title (<i>). always pass in null
    byte[] page_display_title =
        Xoh_page_wtr_wkr_.Bld_page_name(tmp_bfr, page_ttl, page.Html_data().Display_ttl());
    page.Html_data()
        .Custom_tab_name_(
            page_name); // set tab_name to page_name; note that if null, gui code will ignore and
                        // use Ttl.Page_txt; PAGE: zh.w:釣魚臺列嶼主權問題 DATE:2015-10-05
    Xow_portal_mgr portal_mgr = wiki.Html_mgr().Portal_mgr().Init_assert();
    fmtr.Bld_bfr_many(
        bfr,
        root_dir_bry,
        Xoa_app_.Version,
        Xoa_app_.Build_date,
        app.Tcp_server().Running_str(),
        page.Db().Page().Id(),
        page.Ttl().Full_db(),
        page_name,
        page.Html_data().Page_heading().Init(page.Html_data(), page_display_title),
        modified_on_msg,
        mgr.Css_common_bry(),
        mgr.Css_wiki_bry(),
        page.Html_data().Head_mgr().Init(app, wiki, page).Init_dflts(),
        page.Lang().Dir_ltr_bry(),
        page.Html_data().Indicators(),
        page_content_sub,
        wiki.Html_mgr().Portal_mgr().Div_jump_to(),
        wiki.Xtn_mgr().Xtn_pgbnr().Write_html(page, ctx, hctx),
        page_body_class,
        html_content_editable,
        page_data,
        wdata_lang_wtr

        // sidebar divs
        ,
        portal_mgr.Div_personal_bry(),
        portal_mgr.Div_ns_bry(wiki.Utl__bfr_mkr(), page_ttl, wiki.Ns_mgr()),
        portal_mgr.Div_view_bry(
            wiki.Utl__bfr_mkr(), html_gen_tid, page.Html_data().Xtn_search_text()),
        portal_mgr.Div_logo_bry(),
        portal_mgr.Div_home_bry(),
        new Xopg_xtn_skin_fmtr_arg(page, Xopg_xtn_skin_itm_tid.Tid_sidebar),
        portal_mgr.Div_sync_bry(
            tmp_bfr, app.Api_root().Addon().Bldr().Sync().Manual_enabled(), wiki, page),
        portal_mgr.Div_wikis_bry(wiki.Utl__bfr_mkr()),
        portal_mgr.Sidebar_mgr().Html_bry(),
        mgr.Edit_rename_div_bry(page_ttl),
        page.Html_data().Edit_preview_w_dbg(),
        js_edit_toolbar_bry);
    Xoh_page_wtr_wkr_.Bld_head_end(bfr, tmp_bfr, page); // add after </head>
    Xoh_page_wtr_wkr_.Bld_html_end(bfr, tmp_bfr, page); // add after </html>		
  }