// Copyright (C) 2016 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <config.h>

#include <dhcpsrv/pgsql_exchange.h>

#include <boost/lexical_cast.hpp>

#include <gtest/gtest.h>

using namespace isc;
using namespace isc::dhcp;

namespace {

/// @brief Converts a time_t into a string matching our Postgres input format
///
/// @param time_val Time value to convert
/// @retrun A string containing the converted time
std::string timeToDbString(const time_t time_val) {
    struct tm tinfo;
    char buffer[20];

    localtime_r(&time_val, &tinfo);
    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &tinfo);
    return(std::string(buffer));
}

/// @brief Basic checks on time conversion functions in PgSqlExchange
/// We input timestamps as date/time strings and we output them as
/// an integer string of seconds since the epoch.  There is no meangingful
/// way to test them round-trip without Postgres involved.
TEST(PgSqlExchangeTest, convertTimeTest) {
    // Get a reference time and time string
    time_t ref_time;
    time(&ref_time);

    std::string ref_time_str(timeToDbString(ref_time));

    // Verify convertToDatabaseTime gives us the expected localtime string
    std::string time_str = PgSqlExchange::convertToDatabaseTime(ref_time);
    EXPECT_EQ(time_str, ref_time_str);

    // Verify convertToDatabaseTime with valid_lifetime = 0  gives us the
    // expected localtime string
    time_str = PgSqlExchange::convertToDatabaseTime(ref_time, 0);
    EXPECT_EQ(time_str, ref_time_str);

    // Verify we can add time by adding a day.
    ref_time_str = timeToDbString(ref_time + (24*3600));
    ASSERT_NO_THROW(time_str = PgSqlExchange::convertToDatabaseTime(ref_time,
                                                                    24*3600));
    EXPECT_EQ(time_str, ref_time_str);

    // Verify too large of a value is detected.
    ASSERT_THROW(PgSqlExchange::convertToDatabaseTime(DatabaseConnection::
                                                      MAX_DB_TIME - 1,
                                                      24*3600),
                 isc::BadValue);

    // Make sure Conversion "from" database time functions
    std::string ref_secs_str = boost::lexical_cast<std::string>(ref_time);
    time_t from_time = PgSqlExchange::convertFromDatabaseTime(ref_secs_str);
    from_time = PgSqlExchange::convertFromDatabaseTime(ref_secs_str);
    EXPECT_EQ(ref_time, from_time);
}

}; // namespace