/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include "qpid/framing/Blob.h"

#define BOOST_AUTO_TEST_MAIN
#include <boost/test/auto_unit_test.hpp>

using namespace std;
using namespace qpid::framing;

struct Base {
    int id;
    int magic;

    Base(int n) : id(n), magic(42) {}
    Base(const Base& c) : id(c.id), magic(42) {}
    ~Base() { BOOST_CHECK_EQUAL(42, magic); } // Detect random data. 
};

template <class T> struct Count : public Base {
    static int instances;
    bool destroyed;
    
    Count(int n) : Base(n), destroyed(false) { ++instances; }
    Count(const Count& c) : Base(c), destroyed(false) { ++instances; }
    ~Count() {
        BOOST_CHECK(!destroyed); // Detect double-destructor
        destroyed=true;
        BOOST_CHECK(--instances >= 0);
    }
};

template <class T> int Count<T>::instances = 0;

struct Foo : public Count<Foo> { Foo(int n) : Count<Foo>(n) {}; };
struct Bar : public Count<Bar> { Bar(int n) : Count<Bar>(n) {}; };

typedef Blob<sizeof(Foo), Base> TestBlob ;

BOOST_AUTO_TEST_CASE(testCtor) {
    {
        TestBlob empty;
        BOOST_CHECK(empty.empty());
        BOOST_CHECK(empty.get() == 0);

        TestBlob empty2(empty);
        BOOST_CHECK(empty2.empty());

        TestBlob foo(in_place<Foo>(1));
        BOOST_CHECK(!foo.empty());
        BOOST_CHECK_EQUAL(1, foo.get()->id);
        BOOST_CHECK_EQUAL(1, Foo::instances);

        TestBlob foo2(foo);
        BOOST_CHECK(!foo2.empty());
        BOOST_CHECK_EQUAL(1, foo2.get()->id);
        BOOST_CHECK_EQUAL(2, Foo::instances);
    }
    
    BOOST_CHECK_EQUAL(0, Foo::instances);
    BOOST_CHECK_EQUAL(0, Bar::instances);
}


BOOST_AUTO_TEST_CASE(testAssign) {
    {
        TestBlob b;
        b = Foo(2);
        BOOST_CHECK_EQUAL(2, b.get()->id);
        BOOST_CHECK_EQUAL(1, Foo::instances);

        TestBlob b2(b);
        BOOST_CHECK_EQUAL(2, b.get()->id);
        BOOST_CHECK_EQUAL(2, Foo::instances);
    
        b2 = Bar(3);
        BOOST_CHECK_EQUAL(3, b2.get()->id);
        BOOST_CHECK_EQUAL(1, Foo::instances);
        BOOST_CHECK_EQUAL(1, Bar::instances);

        b2.construct(in_place<Foo>(4)); 
        BOOST_CHECK_EQUAL(4, b2.get()->id);
        BOOST_CHECK_EQUAL(2, Foo::instances);
        BOOST_CHECK_EQUAL(0, Bar::instances);

        b2.clear();
        BOOST_CHECK(b2.empty());
        BOOST_CHECK_EQUAL(1, Foo::instances);
    }
    BOOST_CHECK_EQUAL(0, Foo::instances);
    BOOST_CHECK_EQUAL(0, Bar::instances);
}


BOOST_AUTO_TEST_CASE(testClear) {
    TestBlob b(in_place<Foo>(5));
    TestBlob c(b);
    BOOST_CHECK(!c.empty());
    BOOST_CHECK(!b.empty());
    BOOST_CHECK_EQUAL(2, Foo::instances);

    c.clear();
    BOOST_CHECK(c.empty());
    BOOST_CHECK_EQUAL(1, Foo::instances);

    b.clear(); 
    BOOST_CHECK(b.empty());
    BOOST_CHECK_EQUAL(0, Foo::instances);
}
