/*
XOWA: the XOWA Offline Wiki Application
Copyright (C) 2012 gnosygnu@gmail.com

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package gplx.xowa; import gplx.*;
import gplx.xowa.specials.*; import gplx.xowa.specials.allPages.*;
public class Xob_hive_mgr {
	public Xob_hive_mgr(Xow_wiki wiki) {this.wiki = wiki; this.fsys_mgr = wiki.Fsys_mgr();} private Xow_wiki wiki; Xow_fsys_mgr fsys_mgr;
	public void Clear() {regy.Clear(); xdat.Clear();}
	public void Special_allpages_query(Xows_page_allpages mgr, Xow_ns ns, byte[] key, int count, boolean include_redirects) {
		byte dir_tid = Xow_dir_info_.Tid_ttl;
		int xdat_idx = Regy__find_file_ns(key, dir_tid, ns.Num_str());
		Xob_xdat_file xdat_main = new Xob_xdat_file();
		xdat_main = xdat_load_(xdat_main, dir_tid, ns, xdat_idx);
		xdat_main.Find(xdat_itm, key, Xodb_page_.Txt_ttl_pos, Byte_ascii.Tab, false);
		int itm_idx = xdat_itm.Itm_idx();
		Special_allpages_query_fwd(mgr, dir_tid, ns, include_redirects, count, xdat_idx, itm_idx    , xdat_main);
		Special_allpages_query_bwd(mgr, dir_tid, ns, include_redirects, count, xdat_idx, itm_idx - 1, xdat_main);
	}
	Xob_xdat_file xdat_load_(Xob_xdat_file xdat, byte dir_tid, Xow_ns ns, int fil_idx) {
		Io_url xdat_url = fsys_mgr.Url_ns_fil(dir_tid, ns.Id(), fil_idx);
		byte[] xdat_bry = gplx.ios.Io_stream_rdr_.Load_all(xdat_url);
		xdat.Parse(xdat_bry, xdat_bry.length, xdat_url);
		return xdat;
	}
	private void Special_allpages_query_fwd(Xows_page_allpages mgr, byte dir_tid, Xow_ns ns, boolean include_redirects, int total, int fil_idx, int row_idx, Xob_xdat_file xdat_file) {
		int count = 0; ++total;
		boolean loop = true;
		int regy_len = regy.Files_ary().length;
		int rslt_list_len = mgr.Rslt_list_len();
		Xodb_page[] rslt_list_ttls = mgr.Rslt_list_ttls();
		Xodb_page nxt_itm = null;
		while (loop) {
			if (fil_idx == regy_len) break;
			if (xdat_file == null) {
				xdat_file = xdat_load_(this.xdat, dir_tid, ns, fil_idx);
				row_idx = 0;
			}
			int rows_len = xdat_file.Count();
			for (; row_idx < rows_len; row_idx++) {
				xdat_file.GetAt(xdat_itm, row_idx);
				Xodb_page ttl_itm = Xodb_page_.Txt_ttl_load(Bry_.Mid(xdat_itm.Src(), xdat_itm.Itm_bgn(), xdat_itm.Itm_end()));
				if (!include_redirects && ttl_itm.Type_redirect()) continue;
				++count;
				nxt_itm = ttl_itm;
				if (count == total) {
					loop = false;
					break;
				}
				else
					rslt_list_ttls[rslt_list_len++] = ttl_itm;
			}
			xdat_file = null;
			++fil_idx;
		}
		mgr.Rslt_list_len_(rslt_list_len);
		mgr.Rslt_nxt_(nxt_itm);
	}
	private void Special_allpages_query_bwd(Xows_page_allpages mgr, byte dir_tid, Xow_ns ns, boolean include_redirects, int total, int fil_idx, int row_idx, Xob_xdat_file xdat_file) {
		if (row_idx < 0) {
			--fil_idx;
			row_idx = -1;
		}
		int count = 0;
		boolean loop = true;
		Xodb_page prv_itm = null;
		while (loop) {
			if (fil_idx == -1) break;
			if (xdat_file == null) {
				xdat_file = xdat_load_(this.xdat, dir_tid, ns, fil_idx);
				row_idx = -1;
			}
			if (row_idx == -1)
				row_idx = xdat_file.Count() - 1;
			for (; row_idx > -1; row_idx--) {
				xdat_file.GetAt(xdat_itm, row_idx);
				Xodb_page ttl_itm = Xodb_page_.Txt_ttl_load(Bry_.Mid(xdat_itm.Src(), xdat_itm.Itm_bgn(), xdat_itm.Itm_end()));
				if (!include_redirects && ttl_itm.Type_redirect()) continue;
//				list.Add(ttl_itm);
				++count;
				prv_itm = ttl_itm;
				if (count == total) {					
					loop = false;
					break;
				}
				else {
//					rslt_list_ttls[rslt_list_len++] = ttl_itm;
				}
			}
			xdat_file = null;
			--fil_idx;
		}
		if (prv_itm == null) prv_itm = mgr.Rslt_list_ttls()[0];
		mgr.Rslt_prv_(prv_itm);			
	}
	public void Find_bgn(ListAdp list, Xow_ns ns, byte[] key, int count, boolean include_redirects) {
		byte dir_tid = Xow_dir_info_.Tid_ttl;
		int xdat_idx = Regy__find_file_ns(key, dir_tid, ns.Num_str());
		Io_url xdat_url = fsys_mgr.Url_ns_fil(dir_tid, ns.Id(), xdat_idx);
		byte[] xdat_bry = gplx.ios.Io_stream_rdr_.Load_all(xdat_url);
		xdat.Parse(xdat_bry, xdat_bry.length, xdat_url);
		xdat.Find(xdat_itm, key, Xodb_page_.Txt_ttl_pos, Byte_ascii.Tab, false);
		Find_nearby_add_fwd(list, dir_tid, ns, include_redirects, count, xdat_idx, xdat_itm.Itm_idx());
	}	private Xob_xdat_itm xdat_itm = new Xob_xdat_itm(); //Int_2_ref find_nearby_rslt = new Int_2_ref();
//		private void Find_nearby_add_bwd(ListAdp list, byte dir_tid, Xow_ns ns, boolean include_redirects, int total, int fil_bgn, int row_bgn) {
//			if (--row_bgn < 0) {
//				--fil_bgn;
//				row_bgn = -1;
//			}
//			int fil_idx = fil_bgn;
//			boolean first = true;
//			int count = 0;
//			boolean loop = true;
//			while (loop) {
//				if (fil_idx == -1) break;
//				Io_url xdat_url = fsys_mgr.Url_ns_fil(dir_tid, ns.Id(), fil_idx);
//				byte[] xdat_bry = gplx.ios.Io_stream_rdr_.Load_all(xdat_url);
//				xdat.Parse(xdat_bry, xdat_bry.length, xdat_url);
//				int row_idx = first && row_bgn != -1 ? row_bgn : xdat.Count() - 1;
//				first = false;
//				for (; row_idx > -1; row_idx--) {
//					xdat.GetAt(xdat_itm, row_idx);
//					Xodb_page ttl_itm = Xodb_page_.Txt_ttl_load(Bry_.Mid(xdat_itm.Src(), xdat_itm.Itm_bgn(), xdat_itm.Itm_end()));
//					if (!include_redirects && ttl_itm.Type_redirect()) continue;
//					list.Add(ttl_itm);
//					if (++count == total) {loop = false; break;}
//				}
//				--fil_idx;
//			}
//		}
	private void Find_nearby_add_fwd(ListAdp list, byte dir_tid, Xow_ns ns, boolean include_redirects, int total, int fil_bgn, int row_bgn) {
		int fil_idx = fil_bgn;
		boolean first = true;
		int count = 0;
		boolean loop = true;
		int regy_len = regy.Files_ary().length;
		while (loop) {
			if (fil_idx == regy_len) break;
			Io_url xdat_url = fsys_mgr.Url_ns_fil(dir_tid, ns.Id(), fil_idx);
			byte[] xdat_bry = gplx.ios.Io_stream_rdr_.Load_all(xdat_url);
			xdat.Parse(xdat_bry, xdat_bry.length, xdat_url);
			int row_idx = first ? row_bgn : 0;
			int rows_len = xdat.Count();
			first = false;
			for (; row_idx < rows_len; row_idx++) {
				xdat.GetAt(xdat_itm, row_idx);
				Xodb_page ttl_itm = Xodb_page_.Txt_ttl_load(Bry_.Mid(xdat_itm.Src(), xdat_itm.Itm_bgn(), xdat_itm.Itm_end()));
				if (!include_redirects && ttl_itm.Type_redirect()) continue;
				list.Add(ttl_itm);
				if (++count == total) {loop = false; break;}
			}
			++fil_idx;
		}
	}
	public void Create(byte dir_tid, byte[] key, byte[] row) {	// Ctg_0; Ctg_0|!!!!"|!!!!#
		int xdat_idx = Regy__find_file(key, dir_tid);
		if (xdat_idx == Xowd_regy_mgr.Regy_null) {	// no entries in regy; create at least one; EX: "" -> "0|A|A|1"
			regy.Create(key);
			xdat_idx = 0;
		}
		else
			regy.Update_add(0, key);
		regy.Save();
		Xdat__create_row(dir_tid, key, row, xdat_idx);
	}
	int Regy__find_file(byte[] key, byte dir_tid)					{return Regy__find_file_by_url(key, fsys_mgr.Url_site_reg(dir_tid));}
	int Regy__find_file_ns(byte[] key, byte dir_tid, String ns_num) {return Regy__find_file_by_url(key, fsys_mgr.Url_ns_reg(ns_num, Xow_dir_info_.Tid_ttl));}
	int Regy__find_file_by_url(byte[] key, Io_url regy_url) {regy.Init(regy_url); return regy.Files_find(key);} private Xowd_regy_mgr regy = new Xowd_regy_mgr();
	private void Xdat__create_row(byte dir_tid, byte[] key, byte[] row, int xdat_idx) {
		Io_url xdat_url = fsys_mgr.Url_site_fil(dir_tid, xdat_idx);
		byte[] xdat_bry = gplx.ios.Io_stream_rdr_.Load_all(xdat_url);
		Xob_xdat_file xdat_fil = new Xob_xdat_file();
		if (xdat_bry.length > 0)	// if file is not empty, load it and parse it
			xdat_fil.Parse(xdat_bry, xdat_bry.length, xdat_url);
		Bry_bfr tmp_bfr = wiki.Utl_bry_bfr_mkr().Get_m001();
		xdat_fil.Insert(tmp_bfr, row);
		xdat_fil.Save(xdat_url);
		tmp_bfr.Mkr_rls();
	}	private Xob_xdat_file xdat = new Xob_xdat_file(); Io_zip_mgr zip_mgr = Io_zip_mgr_base._;
}
