/*
 * 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/.
 *
 * Copyright 2010-2019 Danny Robson <danny@nerdcruft.net>
 */

#pragma once

#include "./common.hpp"
#include "./panic.hpp"
#include "./debugger.hpp"

#include "../platform.hpp"
#include "../maths.hpp"


#include <utility>

#ifndef NDEBUG
#include <iostream>
#endif

///////////////////////////////////////////////////////////////////////////////
#ifdef COMPILER_GCC
#define CHECK(C) do {                                       \
    _Pragma("GCC diagnostic push")                          \
    _Pragma("GCC diagnostic ignored \"-Wnonnull-compare\"") \
    DEBUG_ONLY (                                            \
        if (!(C))                                           \
            panic (#C);                                     \
    );                                                      \
    _Pragma("GCC diagnostic pop")                           \
} while (0)
#elif defined(COMPILER_CLANG)
#define CHECK(C) do {                                       \
    DEBUG_ONLY (                                            \
        if (!(C))                                           \
            panic (#C);                                     \
    );                                                      \
} while (0)
#else
#error Unhandled compiler
#endif


///////////////////////////////////////////////////////////////////////////////
#define SCOPED_SANITY(A) \
::cruft::debug::scoped_sanity PASTE(__scoped_sanity_checker,__LINE__) ((A)); \
(void)PASTE(__scoped_sanity_checker,__LINE__);


///////////////////////////////////////////////////////////////////////////////
#define CHECK_SANITY(A,...) CHECK(::cruft::debug::is_valid ((A) __VA_OPT__(,) __VA_ARGS__))


///////////////////////////////////////////////////////////////////////////////
#define CHECK_EQ(A,B) do {                                  \
    DEBUG_ONLY (                                            \
        const auto &__a = (A);                              \
        const auto &__b = (B);                              \
                                                            \
        if (!::cruft::almost_equal (__a, __b)) {             \
            std::cerr << "expected equality\n"              \
                         "__a: " #A " is " << __a << "\n"   \
                         "__b: " #B " is " << __b << "\n";  \
            breakpoint ();                                  \
        }                                                   \
    );                                                      \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_LT(A,B) do {                                          \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
        const auto &__b = (B);                                      \
                                                                    \
        if (__a >= __b) {                                           \
            std::cerr << "expected less than\n"                     \
                          "__a: " << #A << " is " << __a << "\n"    \
                          "__b: " << #B << " is " << __b << "\n";   \
            breakpoint ();                                          \
        };                                                          \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_LE(A,B) do {                                          \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
        const auto &__b = (B);                                      \
                                                                    \
        if (!(__a <= __b)) {                                        \
            std::cerr << "expected less than or equal\n"            \
                         "__a: " << #A << " is " << __a << "\n"     \
                         "__b: " << #B << " is " << __b << "\n";    \
            breakpoint ();                                          \
        }                                                           \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_GT(A,B) do {                                          \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
        const auto &__b = (B);                                      \
                                                                    \
        if (__a <= __b) {                                           \
            std::cerr << "expected greater than\n"                  \
                          "__a: " << #A << " is " << __a << "\n"    \
                          "__b: " << #B << " is " << __b << "\n";   \
            breakpoint ();                                          \
        }                                                           \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_GE(A,B) do {                                          \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
        const auto &__b = (B);                                      \
                                                                    \
        if (__a < __b) {                                            \
            std::cerr << "expected greater or equal\n"              \
                          "__a: " << #A << " is " << __a << "\n"    \
                          "__b: " << #B << " is " << __b << "\n";   \
            breakpoint ();                                          \
        };                                                          \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_INCLUSIVE(V,L,H) do {                                 \
    DEBUG_ONLY (                                                    \
        const auto &__v = (V);                                      \
        const auto &__l = (L);                                      \
        const auto &__h = (H);                                      \
                                                                    \
        if (__v < __l || __v > __h) {                               \
            std::cerr << "expected inclusive\n"                     \
                          "__l: " << #L << " is " << +__l << "\n"   \
                          "__h: " << #H << " is " << +__h << "\n"   \
                          "__v: " << #V << " is " << +__v << "\n";  \
            breakpoint ();                                          \
        };                                                          \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_INDEX(V,H) do {                                       \
    DEBUG_ONLY (                                                    \
        const auto &__v = (V);                                      \
        const auto &__h = (H);                                      \
                                                                    \
        _Pragma("GCC diagnostic push")                              \
        _Pragma("GCC diagnostic ignored \"-Wtype-limits\"")         \
                                                                    \
        if (intmax_t (__v) < 0 || __v >= __h) {                     \
            std::cerr << "expected index\n"                         \
                          "__h: " << #H << " is " << +__h << "\n"   \
                          "__v: " << #V << " is " << +__v << "\n";  \
            breakpoint ();                                          \
        };                                                          \
                                                                    \
        _Pragma("GCC diagnostic pop")                               \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_NEQ(A,B) do {                                         \
    DEBUG_ONLY(                                                     \
        const auto &__a = (A);                                      \
        const auto &__b = (B);                                      \
                                                                    \
        if (::cruft::almost_equal (__a, __b)) {                      \
            std::cerr << "expected inequality\n"                    \
                          "__a: " << #A << " is " << __a << "\n"    \
                          "__b: " << #B << " is " << __b << "\n";   \
            breakpoint ();                                          \
        };                                                          \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_ZERO(A) do {                                          \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
                                                                    \
        if (!::cruft::almost_zero (__a)) {                           \
            std::cerr << "expected zero\n"                          \
                          "__a: " << #A << " is " << __a << "\n";   \
            breakpoint ();                                          \
        };                                                          \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_NEZ(A) do {                                           \
    DEBUG_ONLY (                                                    \
        const auto &__a = (A);                                      \
                                                                    \
        if (::cruft::exactly_zero (__a))  {                          \
            std::cerr << "expected non-zero\n"                      \
                          "__a: " << #A << " is " << __a << '\n';   \
            breakpoint ();                                          \
        }                                                           \
    );                                                              \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_MOD(V,M) do {                                                 \
    DEBUG_ONLY (                                                            \
        const auto &__check_mod_v = (V);                                    \
        const auto &__check_mod_m = (M);                                    \
                                                                            \
        if (!::cruft::exactly_zero (__check_mod_v % __check_mod_m)) {        \
            std::cerr << "expected zero modulus\n"                          \
                          "__v: " << #V << " is " << __check_mod_v << "\n"  \
                          "__m: " << #M << " is " << __check_mod_m << "\n"; \
            breakpoint ();                                                  \
        }                                                                   \
    );                                                                      \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#if defined(ENABLE_DEBUGGING)
#define CHECK_ENUM(C, ...) do {                                 \
    const auto &__c = (C);                                      \
    const auto &__e = { __VA_ARGS__ };                          \
                                                                \
    if (std::find (std::cbegin (__e),                           \
                   std::cend   (__e),                           \
                  __c) == std::end (__e)) {                     \
        std::cerr << "expect enum\n"                            \
                     "__c: " << #C << " is " << __c << '\n';    \
        breakpoint ();                                          \
    }                                                           \
} while (0)
#else
#define CHECK_ENUM(C,...)
#endif


#if !defined(NDEBUG)
#define CHECK_FINITE(V) do {                                    \
        const auto &__v = (V);                                      \
        if (!std::isfinite (__v)) {                                 \
            std::cerr << "expected finite value\n"                  \
                          "__v: " << #V << " is " << __v << '\n';   \
            breakpoint ();                                          \
        }                                                           \
    } while (0)
#else
#define CHECK_FINITE(V,...)
#endif




///////////////////////////////////////////////////////////////////////////////
#define CHECK_THROWS(E,C) do {                                  \
    DEBUG_ONLY (                                                \
        bool caught = false;                                    \
                                                                \
        try                                                     \
            { C; }                                              \
        catch (E const&)                                        \
            { caught = true; }                                  \
                                                                \
        if (!caught) {                                          \
            std::cerr << "expected exception: " << #E << '\n'   \
            breakpoint ();                                      \
        }                                                       \
    );                                                          \
} while (0)


///////////////////////////////////////////////////////////////////////////////
#define CHECK_NOTHROW(C) do {                                           \
    DEBUG_ONLY (                                                        \
        try {                                                           \
            C;                                                          \
        } catch (const std::exception &e) {                             \
            std::cerr << "unexpected exception: " << e.what () << '\n'; \
            breakpoint ();                                              \
        } catch (...) {                                                 \
            std::cerr << "unexpected exception: unknown\n";             \
            breakpoint ();                                              \
        }                                                               \
    );                                                                  \
} while (0)