/*
 * 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.
 *
 * Copyright 2015 Danny Robson <danny@nerdcruft.net>
 */

#ifdef __UTIL_TAP_IPP
#error
#endif
#define __UTIL_TAP_IPP

#include "maths.hpp"

#include <cstdlib>
#include <algorithm>

#include "format.hpp"


///////////////////////////////////////////////////////////////////////////////
template <typename ...Args>
void
util::TAP::logger::expect (bool test, const std::string &fmt, Args&&... args)
{
    std::cout << (test ? "ok " : "not ok ") << ++m_size
              << " - "
              << util::format::render (fmt, std::forward<Args> (args)...) << '\n';

    if (!test)
        m_status = EXIT_FAILURE;
}


//-----------------------------------------------------------------------------
template <typename... Args>
void
util::TAP::logger::expect (std::function<bool(Args...)> test, Args&&... args, const std::string &msg)
{
    expect (test (std::forward<Args> (args)...), msg);
}


//-----------------------------------------------------------------------------
template <typename T, typename U, typename ...Args>
void
util::TAP::logger::expect_eq (const T&a, const U &b, const std::string &fmt, Args&... args)
{
    static const std::function<bool(const T&,const U&)> TEST = [] (const T &t, const U &u) -> bool {
        return almost_equal (t, u);
    };

    expect<const T&, const U&> (TEST, a, b, util::format::render (fmt, std::forward<Args> (args)...));
}


//-----------------------------------------------------------------------------
template <typename T, typename U, typename ...Args>
void
util::TAP::logger::expect_neq (const T&a, const U &b, const std::string &fmt, Args&... args)
{
    static const std::function<bool(const T&,const U&)> TEST = [] (const T &t, const U &u) -> bool {
        return !almost_equal (t, u);
    };

    expect<const T&, const U&> (TEST, a, b, util::format::render (fmt, std::forward<Args> (args)...));
}


//-----------------------------------------------------------------------------
#define TAP_TEST(SUFFIX,OP)                                     \
template <typename T, typename U, typename ...Args>             \
void                                                            \
util::TAP::logger::expect_ ## SUFFIX (const T &a,               \
                                      const U &b,               \
                                      const std::string &fmt,   \
                                      Args&... args)            \
{                                                               \
    static const std::function<                                 \
        bool(const T&,const U&)                                 \
    > TEST = [] (const T&t, const U&u) { return t OP u; };      \
                                                                \
    expect<const T&, const U&> (                                \
        TEST,                                                   \
        a, b,                                                   \
        util::format::render (                                  \
            fmt,                                                \
            std::forward<Args> (args)...                        \
        )                                                       \
    );                                                          \
}

TAP_TEST(gt, > )
TAP_TEST(ge, >=)
TAP_TEST(lt, < )
TAP_TEST(le, <=)

#undef TAP_TEST


//-----------------------------------------------------------------------------
template <typename T, typename ...Args>
void
util::TAP::logger::expect_nan (const T &t, const std::string &fmt, Args&... args)
{
    bool(*func)(T) = std::isnan;
    expect<const T&> (
        std::function<bool(const T&)> (func),
        t,
        util::format::render (fmt, std::forward<Args> (args)...)
    );
}


//-----------------------------------------------------------------------------
template <typename T, typename ...Args>
void
util::TAP::logger::expect_nothrow (T &&t, const std::string &fmt, Args&... args)
{
    bool success = true;

    try {
        t ();
    } catch (...) {
        success = false;
    }

    expect (success, util::format::render (fmt, std::forward<Args> (args)...));
}


//-----------------------------------------------------------------------------
template <typename E, typename T, typename ...Args>
void
util::TAP::logger::expect_throw (T &&t, const std::string &fmt, Args&... args)
{
    bool success = false;

    try {
        t ();
    } catch (const E&) {
        success = true;
    } catch (...) {
        success = false;
    }

    expect (success, util::format::render (fmt, std::forward<Args> (args)...));
}