// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
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// ==========================================================================
// Author: Rene Rahn <rene.rahn@fu-berlin.de>
// ==========================================================================
// Tests for the observable pattern.
// ==========================================================================

#ifndef TESTS_JOURNALED_STRING_TREE_TEST_BASIC_OBSERVABLE_H_
#define TESTS_JOURNALED_STRING_TREE_TEST_BASIC_OBSERVABLE_H_

#include <seqan/basic.h>
#include <seqan/journaled_string_tree.h>

using namespace seqan2;

namespace test_basic_observer

{
struct Foo_
{

    unsigned i = 0;

    Foo_() : i(1)
    {}

    Foo_(unsigned num) : i(num)
    {}
};

struct Bar_
{

    unsigned i = 0;

    Bar_() : i(2)
    {}

    Bar_(unsigned num) : i(num)
    {}
};

inline void notify(Foo_ & f, Nothing const & /*tag*/)
{
    f.i +=2;
}

inline void notify(Bar_ & b, Nothing const & /*tag*/)
{
    b.i += 3;
}

}

SEQAN_DEFINE_TEST(test_basic_observable_length)
{
    {  // Length 2.
        ObserverList<test_basic_observer::Bar_, test_basic_observer::Foo_> subject;
        SEQAN_ASSERT(length(subject) == 2u);
    }

    {  // Length 3.
        ObserverList<test_basic_observer::Bar_, test_basic_observer::Bar_, test_basic_observer::Foo_> subject;
        SEQAN_ASSERT(length(subject) == 3);
    }

    {  // Length 0.
        ObserverList<> subject;
        SEQAN_ASSERT(length(subject) == 0u);
    }

}

SEQAN_DEFINE_TEST(test_basic_observable_set_observer)
{

    ObserverList<test_basic_observer::Bar_, test_basic_observer::Foo_, test_basic_observer::Bar_> subject;
    test_basic_observer::Bar_ bar(4);
    setObserver<0>(subject, bar);
    setObserver<1>(subject, test_basic_observer::Foo_(6));
    setObserver<2>(subject, test_basic_observer::Bar_(8));

    SEQAN_ASSERT(std::get<0>(subject).i == 4);
    SEQAN_ASSERT(std::get<1>(subject).i == 6);
    SEQAN_ASSERT(std::get<2>(subject).i == 8);
}

SEQAN_DEFINE_TEST(test_basic_observable_notify)
{
    ObserverList<test_basic_observer::Bar_, test_basic_observer::Foo_, test_basic_observer::Bar_> subject;
    test_basic_observer::Bar_ bar(4);
    setObserver<0>(subject, bar);
    setObserver<1>(subject, test_basic_observer::Foo_(6));
    setObserver<2>(subject, test_basic_observer::Bar_(8));

    notify(subject, Nothing());

    SEQAN_ASSERT(std::get<0>(subject).i == 7);
    SEQAN_ASSERT(std::get<1>(subject).i == 8);
    SEQAN_ASSERT(std::get<2>(subject).i == 11);
}

SEQAN_DEFINE_TEST(test_basic_observable_make_observer_list)
{
    auto list = makeObserverList(test_basic_observer::Bar_(4), test_basic_observer::Foo_(6), test_basic_observer::Bar_(5));

    SEQAN_ASSERT(std::get<0>(list).i == 4);
    SEQAN_ASSERT(std::get<1>(list).i == 6);
    SEQAN_ASSERT(std::get<2>(list).i == 5);
}

#endif // TESTS_JOURNALED_STRING_TREE_TEST_BASIC_OBSERVABLE_H_
