/*
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.dbs.qrys; import gplx.*; import gplx.dbs.*;
import gplx.core.criterias.*;
import gplx.dbs.sqls.*; import gplx.dbs.sqls.itms.*; 
public class Db_qry__select_cmd implements Db_qry {
	public int				Tid()				{return Db_qry_.Tid_select;}
	public boolean				Exec_is_rdr()		{return Bool_.Y;}
	public String			Base_table()		{return from.Base_tbl.Name;}
	public Sql_from_itm		From()				{return from;} private Sql_from_itm from;
	public Db_qry__select_cmd From_(String tbl) {return From_(tbl, Sql_tbl_itm.Alias__null);}
	public Db_qry__select_cmd From_(String name, String alias) {return From_(Sql_tbl_itm.Db__null, name, alias);}
	public Db_qry__select_cmd From_(String db, String tbl, String alias) {
		if (from != null) throw Err_.new_("sql_qry", "super table already defined", "from", from.Base_tbl.Name);
		from = new Sql_from_itm(new Sql_tbl_itm(Sql_tbl_itm.Tid__from, db, tbl, alias, Sql_join_itm.Ary__empty));
		return this;
	}
	public Db_qry__select_cmd Join_(String name, String alias, Sql_join_itm... join_flds) {return Join_(Sql_tbl_itm.Db__null, name, alias, join_flds);}
	public Db_qry__select_cmd Join_(String db, String name, String alias, Sql_join_itm... join_flds) {
		if (from == null) throw Err_.new_("sql_qry", "super table is not defined");
		from.Tbls.Add(new Sql_tbl_itm(Sql_tbl_itm.Tid__inner, db, name, alias, join_flds));
		return this;
	}
	public Sql_select_itm Cols() {return cols;} private Sql_select_itm cols = Sql_select_itm.All;
	public Db_qry__select_cmd Distinct_() {cols.Distinct = true; return this;}
	public Db_qry__select_cmd Cols_all_() {cols = Sql_select_itm.All; return this;}
	public Db_qry__select_cmd Cols_(String... ary) {return Cols_w_tbl_(Sql_select_fld.Tbl_null, ary);}
	public Db_qry__select_cmd Cols_w_tbl_(String tbl, String... ary) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		for (String itm : ary)
			cols.Flds.Add(Sql_select_fld.New_fld(tbl, itm, itm));
		return this;
	}
	public Db_qry__select_cmd Cols_w_alias_(String expr, String alias) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		cols.Flds.Add(Sql_select_fld.New_fld(Sql_select_fld.Tbl_null, expr, alias));
		return this;
	}
	public Sql_where_itm Where_itm() {return where_itm;} private Sql_where_itm where_itm = Sql_where_itm.All;
	public Db_qry__select_cmd Where_(Criteria root) {
		if (where_itm == Sql_where_itm.All) where_itm = new Sql_where_itm();
		where_itm.Root = root;
		return this;
	}
	public Db_qry__select_cmd Where_and(Criteria crt) {
		if (where_itm == Sql_where_itm.All) throw Err_.new_("sql_qry", "where is not defined");
		where_itm.Root = Criteria_.And(where_itm.Root, crt);
		return this;
	}
	public Sql_order_itm Order() {return order;} private Sql_order_itm order = null;
	public Db_qry__select_cmd Order_asc_(String fld) {return Order_(fld, Bool_.Y);}
	public Db_qry__select_cmd Order_(String fld, boolean asc) {return Order_(Sql_order_fld.Tbl__null, fld, asc);}
	public Db_qry__select_cmd Order_(String tbl, String fld, boolean asc) {
		Sql_order_fld item = new Sql_order_fld(tbl, fld, asc ? Sql_order_fld.Sort__nil : Sql_order_fld.Sort__dsc);
		order = new Sql_order_itm(new Sql_order_fld[] {item});
		return this;
	}
	public Db_qry__select_cmd Order_asc_many_(String... flds) {
		int flds_len = flds.length;
		Sql_order_fld[] ary = new Sql_order_fld[flds_len];
		for (int i = 0; i < flds_len; ++i)
			ary[i] = new Sql_order_fld(Sql_order_fld.Tbl__null, flds[i], Sql_order_fld.Sort__nil);
		order = new Sql_order_itm(ary);
		return this;
	}
	public int Limit() {return limit;} public Db_qry__select_cmd Limit_(int v) {this.limit = v; return this;} private int limit = Limit__disabled; public static final int Limit__disabled = Int_.Min_value;
	public int Offset() {return offset;} public Db_qry__select_cmd Offset_(int v) {this.offset = v; return this;} private int offset = Offset__disabled; public static final int Offset__disabled = Int_.Min_value;
	public String Indexed_by() {return indexed_by;} public Db_qry__select_cmd Indexed_by_(String v) {indexed_by = v; return this;} private String indexed_by;

	public Sql_group_itm GroupBy() {return groupBy;} private Sql_group_itm groupBy = null;
	public Db_qry__select_cmd GroupBy_(String... flds) {
		if (groupBy != null) throw Err_.new_("sql_qry", "group by already defined", "group", groupBy);
		groupBy = Sql_group_itm.new_(flds);
		return this;
	}
	public Db_qry__select_cmd Cols_groupBy_max(String fld) {return Cols_groupBy_max(fld, fld);}
	public Db_qry__select_cmd Cols_groupBy_max(String fld, String alias) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		cols.Flds.Add(Sql_select_fld.New_max(Sql_select_fld.Tbl_null, fld, alias));
		return this;
	}
	public Db_qry__select_cmd Cols_groupBy_min(String fld, String alias) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		cols.Flds.Add(Sql_select_fld.New_min(Sql_select_fld.Tbl_null, fld, alias));
		return this;
	}
	public Db_qry__select_cmd Cols_groupBy_count(String fld, String alias) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		cols.Flds.Add(Sql_select_fld.New_count(Sql_select_fld.Tbl_null, fld, alias));
		return this;
	}
	public Db_qry__select_cmd Cols_groupBy_sum(String fld) {return Cols_groupBy_sum(fld, fld);}
	public Db_qry__select_cmd Cols_groupBy_sum(String fld, String alias) {
		if (cols == Sql_select_itm.All) cols = new Sql_select_itm();
		cols.Flds.Add(Sql_select_fld.New_sum(Sql_select_fld.Tbl_null, fld, alias));
		return this;
	}
	
	public String		To_sql__exec(gplx.dbs.sqls.Sql_qry_wtr wtr)		{return wtr.To_sql_str(this, Bool_.N);}
	public String		To_sql__prep(gplx.dbs.sqls.Sql_qry_wtr wtr)		{return wtr.To_sql_str(this, Bool_.Y);}		
}