// Copyright (C) 2011-2015 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 <dhcp/dhcp6.h>
#include <dhcp/option.h>
#include <dhcp/option_int.h>
#include <dhcp/option6_iaaddr.h>
#include <util/buffer.h>

#include <boost/scoped_ptr.hpp>
#include <gtest/gtest.h>

#include <iostream>
#include <sstream>

#include <arpa/inet.h>

using namespace std;
using namespace isc;
using namespace isc::asiolink;
using namespace isc::dhcp;
using namespace isc::util;

namespace {
class Option6IAAddrTest : public ::testing::Test {
public:
    Option6IAAddrTest() : buf_(255), outBuf_(255) {
        for (unsigned i = 0; i < 255; i++) {
            buf_[i] = 255 - i;
        }
    }
    OptionBuffer buf_;
    OutputBuffer outBuf_;
};

TEST_F(Option6IAAddrTest, basic) {
    for (int i = 0; i < 255; i++) {
        buf_[i] = 0;
    }
    buf_[0] = 0x20;
    buf_[1] = 0x01;
    buf_[2] = 0x0d;
    buf_[3] = 0xb8;
    buf_[4] = 0x00;
    buf_[5] = 0x01;
    buf_[12] = 0xde;
    buf_[13] = 0xad;
    buf_[14] = 0xbe;
    buf_[15] = 0xef; // 2001:db8:1::dead:beef

    buf_[16] = 0x00;
    buf_[17] = 0x00;
    buf_[18] = 0x03;
    buf_[19] = 0xe8; // 1000

    buf_[20] = 0xb2;
    buf_[21] = 0xd0;
    buf_[22] = 0x5e;
    buf_[23] = 0x00; // 3,000,000,000

    // Create an option (unpack content)
    boost::scoped_ptr<Option6IAAddr> opt(new Option6IAAddr(D6O_IAADDR,
                                                           buf_.begin(),
                                                           buf_.begin() + 24));

    // Pack this option
    opt->pack(outBuf_);

    EXPECT_EQ(28, outBuf_.getLength());

    EXPECT_EQ(Option::V6, opt->getUniverse());

    // 4 bytes header + 4 bytes content
    EXPECT_EQ("2001:db8:1::dead:beef", opt->getAddress().toText());
    EXPECT_EQ(1000, opt->getPreferred());
    EXPECT_EQ(3000000000U, opt->getValid());

    EXPECT_EQ(D6O_IAADDR, opt->getType());

    EXPECT_EQ(Option::OPTION6_HDR_LEN + Option6IAAddr::OPTION6_IAADDR_LEN,
              opt->len());

    // Check if pack worked properly:
    const uint8_t* out = (const uint8_t*)outBuf_.getData();

    // - if option type is correct
    EXPECT_EQ(D6O_IAADDR, out[0]*256 + out[1]);

    // - if option length is correct
    EXPECT_EQ(24, out[2]*256 + out[3]);

    // - if option content is correct
    EXPECT_EQ(0, memcmp(out + 4, &buf_[0], 24));

    EXPECT_NO_THROW(opt.reset());
}

/// @todo: Write test for (type, addr, pref, valid) constructor
/// See option6_iaprefix_unittest.cc for similar test

// Tests if broken usage causes exception to be thrown
TEST_F(Option6IAAddrTest, negative) {

    // Too short. Minimum length is 24
    EXPECT_THROW(Option6IAAddr(D6O_IAADDR, buf_.begin(), buf_.begin() + 23),
                 OutOfRange);

    // This option is for IPv6 addresses only
    EXPECT_THROW(Option6IAAddr(D6O_IAADDR, isc::asiolink::IOAddress("192.0.2.1"),
                               1000, 2000), BadValue);
}

// Tests that option can be converted to textual format.
TEST_F(Option6IAAddrTest, toText) {
    // Create option without suboptions.
    Option6IAAddr opt(D6O_IAADDR, IOAddress("2001:db8:1::1"), 300, 400);
    EXPECT_EQ("type=00005(IAADDR), len=00024: address=2001:db8:1::1,"
              " preferred-lft=300, valid-lft=400",
              opt.toText());

    // Add suboptions and make sure they are printed.
    opt.addOption(OptionPtr(new OptionUint32(Option::V6, 123, 234)));
    opt.addOption(OptionPtr(new OptionUint32(Option::V6, 222, 333)));

    EXPECT_EQ("type=00005(IAADDR), len=00040: address=2001:db8:1::1,"
              " preferred-lft=300, valid-lft=400,\noptions:\n"
              "  type=00123, len=00004: 234 (uint32)\n"
              "  type=00222, len=00004: 333 (uint32)",
              opt.toText());

}

}