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#include "query.h"
#include <iostream>
using namespace std;
WhereClause::WhereClause(void):col(0){}
WhereClause::WhereClause(const int _c,const RowItem &_v):col(_c),value(_v){}
QueryResult::QueryResult(void):res(0){}
QueryResult::QueryResult(int _res):res(_res){}
QueryResult::QueryResult(int _res,const vector<Row> &_rows):res(_res),rows(_rows){}
QueryResult::QueryResult(int _res,const vector<Row> &_rows,const string &_m):res(_res),rows(_rows),msg(_m){}
QueryResult::QueryResult(int _res,const string &_m):res(_res),msg(_m){}
QueryResult Query::execute(map<string,Table> &tables){return QueryResult(-1);}
CreateQuery::CreateQuery(void):nc(0),header(NULL){}
void CreateQuery::setHeader(const ColHeader *hd){
header=new ColHeader[nc];
memcpy(header,hd,nc*sizeof(ColHeader));
}
QueryResult CreateQuery::execute(map<string,Table> &tables){
if(nc==0)return QueryResult(0,"zero nc (CQ:ex)");
if(header==NULL)return QueryResult(0,"null header (CQ:ex)");
const map<string,Table>::const_iterator tit=tables.find(tablename);
if(tit!=tables.cend())return QueryResult(0,"existing table (CQ:ex)");
tables.emplace(piecewise_construct,
forward_as_tuple(tablename),
forward_as_tuple(tablename,nc,header));
return QueryResult(1);
}
FindQuery::FindQuery(void):limit(-1){};
pair<vector<map<string,Row>::const_iterator>,string> FindQuery::executeIterators(map<string,Table> &tables){
const map<string,Table>::const_iterator tit=tables.find(tablename);
if(tit==tables.cend())return {{},"non-existent table (FQ:eI)"};
return executeIterators(tit->second);
}
pair<vector<map<string,Row>::const_iterator>,string> FindQuery::executeIterators(const Table &table){
if(limit==0)return {{},"zero limit (FQ:eI)"};
int i,j;
for(i=0;i<(int)where.size();i++){
if(where[i].col==0)break;
}
if(i!=(int)where.size()){
const map<string,Row>::const_iterator rit=table.rows.find(serialise(table.header[0],where[i].value));
if(rit==table.rows.end())return {{},""};
const Row &row=rit->second;
for(j=0;j<(int)where.size();j++){
if(j==i)continue;
const int col=where[j].col;
if(riCompare(table.header[col],row.items[col],where[j].value)!=0)break;
}
if(j!=(int)where.size())return {{},""};
vector<map<string,Row>::const_iterator> v;
v.push_back(rit);
return {v,""};
}
typedef map<string,Row>::const_iterator cit_t;
cit_t end=table.rows.end();
pair<vector<map<string,Row>::const_iterator>,string> ret;
for(cit_t it=table.rows.begin();it!=end;it++){
for(i=0;i<(int)where.size();i++){
const int col=where[i].col;
if(riCompare(table.header[col],it->second.items[col],where[i].value)!=0)break;
}
if(i==(int)where.size()){
ret.first.push_back(it);
if(ret.first.size()==limit)return ret;
}
}
return ret;
}
QueryResult FindQuery::execute(map<string,Table> &tables){
pair<vector<map<string,Row>::const_iterator>,string> ret=executeIterators(tables);
QueryResult qres;
qres.res=ret.first.size();
for(int i=0;i<qres.res;i++){
qres.rows.push_back(ret.first[i]->second);
}
qres.msg=ret.second;
return qres;
}
InsertQuery::InsertQuery(const Row &_r):row(_r){}
InsertQuery::InsertQuery(Row &&_r):row(move(_r)){}
QueryResult InsertQuery::execute(map <string,Table> &tables){
map<string,Table>::iterator tit=tables.find(tablename);
if(tit==tables.end())return QueryResult(0,"non-existent table (IQ:ex)");
Table &table=tit->second;
if(table.nc!=row.nc)return QueryResult(0,"non-conformant row width (IQ:ex)");
const string primkey=serialise(table.header[0],row.items[0]);
const map<string,Row>::const_iterator rit=table.rows.find(primkey);
if(rit!=table.rows.cend())return QueryResult(0,"existing primary key (IQ:ex)");
table.rows.insert(make_pair(primkey,row));
return QueryResult(1);
}
DeleteQuery::DeleteQuery(void){};
QueryResult DeleteQuery::execute(map<string,Table> &tables){
const map<string,Table>::iterator tit=tables.find(tablename);
if(tit==tables.cend())return {{},"non-existent table (DQ:ex)"};
Table &table=tit->second;
FindQuery fqu;
fqu.tablename=tablename;
fqu.where=where;
pair<vector<map<string,Row>::const_iterator>,string> ret=fqu.executeIterators(table);
if(ret.second.size()!=0)return QueryResult(0,ret.second);
map<string,Row>::const_iterator it;
for(int i=0;i<ret.first.size();i++){
table.rows.erase(ret.first[i]);
}
return QueryResult(ret.first.size());
}
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