#include "Pgsql_Result.h"

using namespace Pgsql;

namespace  {

	void set_stdstring_with_charptr(std::string &s, const char *p)
	{
		if (p) {
			s = p;
		}
		else {
			s.clear();
		}
	}

} // einde unnamed namespace

ErrorDetails ErrorDetails::createErrorDetailsFromPGresult(const PGresult *result)
{

	ErrorDetails r;
	set_stdstring_with_charptr(r.errorMessage,      PQresultErrorMessage(result));
	set_stdstring_with_charptr(r.state,             PQresultErrorField(result, PG_DIAG_SQLSTATE)); ///< PG_DIAG_SQLSTATE Error code as listed in	https://www.postgresql.org/docs/9.5/static/errcodes-appendix.html
	set_stdstring_with_charptr(r.severity,          PQresultErrorField(result, PG_DIAG_SEVERITY));
	set_stdstring_with_charptr(r.messagePrimary,    PQresultErrorField(result, PG_DIAG_MESSAGE_PRIMARY));
	set_stdstring_with_charptr(r.messageDetail,     PQresultErrorField(result, PG_DIAG_MESSAGE_DETAIL));
	set_stdstring_with_charptr(r.messageHint,       PQresultErrorField(result, PG_DIAG_MESSAGE_HINT));
	const char * p = PQresultErrorField(result, PG_DIAG_STATEMENT_POSITION);
	r.statementPosition = p != nullptr ? atoi(p) : -1; ///< First character is one, measured in characters not bytes!
	p = PQresultErrorField(result, PG_DIAG_INTERNAL_POSITION);
	r.internalPosition  = p != nullptr ? atoi(p) : -1;
	set_stdstring_with_charptr(r.internalQuery,     PQresultErrorField(result, PG_DIAG_INTERNAL_QUERY));
	set_stdstring_with_charptr(r.context,           PQresultErrorField(result, PG_DIAG_CONTEXT));
	set_stdstring_with_charptr(r.schemaName,        PQresultErrorField(result, PG_DIAG_SCHEMA_NAME));
	set_stdstring_with_charptr(r.tableName,         PQresultErrorField(result, PG_DIAG_TABLE_NAME));
	set_stdstring_with_charptr(r.columnName,        PQresultErrorField(result, PG_DIAG_COLUMN_NAME));
	set_stdstring_with_charptr(r.datatypeName,      PQresultErrorField(result, PG_DIAG_DATATYPE_NAME));
	set_stdstring_with_charptr(r.constraintName,    PQresultErrorField(result, PG_DIAG_CONSTRAINT_NAME));
	set_stdstring_with_charptr(r.sourceFile,        PQresultErrorField(result, PG_DIAG_SOURCE_FILE));
	set_stdstring_with_charptr(r.sourceLine,        PQresultErrorField(result, PG_DIAG_SOURCE_LINE));
	set_stdstring_with_charptr(r.sourceFunction,    PQresultErrorField(result, PG_DIAG_SOURCE_FUNCTION));
	return r;
}


Result::Result(PGresult *res)
	: result(res)
{
	if (res == nullptr) {
		throw std::runtime_error("Passing nullptr to Result::Result is not allowed");
	}
}

Result::~Result()
{
	PQclear(result);
}


Result::Result(Result &&rhs)
	: result(rhs.result)
{
	rhs.result = nullptr;
}

Result& Result::operator=(Result &&rhs)
{
	if (result) {
		PQclear(result);
	}
	result = rhs.result;
	rhs.result = nullptr;
	return *this;
}

Result::operator bool() const
{
	return result != nullptr;
}

ExecStatusType Result::resultStatus()
{
	return PQresultStatus(result);
}

std::string Result::getResStatus()
{
//    return PQresStatus(result);
		return "";
}

std::string Result::diagSqlState()
{
	std::string s(PQresultErrorField(result, PG_DIAG_SQLSTATE));
	return s;
}


ErrorDetails Result::diagDetails()
{
//	ErrorDetails r;
//	r.state             = PQresultErrorField(result, PG_DIAG_SQLSTATE); ///< PG_DIAG_SQLSTATE Error code as listed in	https://www.postgresql.org/docs/9.5/static/errcodes-appendix.html
//	r.severity          = PQresultErrorField(result, PG_DIAG_SEVERITY);
//	r.messagePrimary    = PQresultErrorField(result, PG_DIAG_MESSAGE_PRIMARY);
//	r.messageDetail     = PQresultErrorField(result, PG_DIAG_MESSAGE_DETAIL);
//	r.messageHint       = PQresultErrorField(result, PG_DIAG_MESSAGE_HINT);
//	r.statementPosition = atoi(PQresultErrorField(result, PG_DIAG_STATEMENT_POSITION)); ///< First character is one, measured in characters not bytes!
//	r.internalPosition  = atoi(PQresultErrorField(result, PG_DIAG_INTERNAL_POSITION));
//	r.internalQuery     = PQresultErrorField(result, PG_DIAG_INTERNAL_QUERY);
//	r.context           = PQresultErrorField(result, PG_DIAG_CONTEXT);
//	r.schemaName        = PQresultErrorField(result, PG_DIAG_SCHEMA_NAME);
//	r.tableName         = PQresultErrorField(result, PG_DIAG_TABLE_NAME);
//	r.columnName        = PQresultErrorField(result, PG_DIAG_COLUMN_NAME);
//	r.datatypeName      = PQresultErrorField(result, PG_DIAG_DATATYPE_NAME);
//	r.constraintName    = PQresultErrorField(result, PG_DIAG_CONSTRAINT_NAME);
//	r.sourceFile        = PQresultErrorField(result, PG_DIAG_SOURCE_FILE);
//	r.sourceLine        = PQresultErrorField(result, PG_DIAG_SOURCE_LINE);
//	r.sourceFunction    = PQresultErrorField(result, PG_DIAG_SOURCE_FUNCTION);

//	return r;
	return ErrorDetails::createErrorDetailsFromPGresult(result);
}

int Result::tuplesAffected() const
{
	int i;
	char * res = PQcmdTuples(result);
	if (res && res[0] != '\0') {
		try {
			i = std::stoi(res);
		}
		catch (std::invalid_argument& ) {
			i = -1;
		}
		catch (std::out_of_range& ) {
			i = -1;
		}
	}
	else {
		i = -1;
	}
	return i;
}

int Result::rows() const
{
	return PQntuples(result);
}

int Result::cols() const
{
	return PQnfields(result);
}

const char * Result::getColName(int idx) const
{
	return PQfname(result, idx);
}

const char * Result::val(int col, int row) const
{
	return PQgetvalue(result, row, col);
}

Value Result::get(int col, int row) const
{
	return Value(
		PQgetvalue(result, row, col),
		PQftype(result, col)
		);
}

Oid Result::type(int col) const
{
	return PQftype(result, col);
}

bool Result::null(int col, int row) const
{
	return PQgetisnull(result, row, col);
}