/**
 * \file src/debug.h
 * MegRay is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2020 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

#pragma once

#include <cstdio>
#include <stdexcept>
#include <string>

namespace MegRay {

typedef enum {
    DEBUG = 0,
    INFO = 1,
    WARN = 2,
    ERROR = 3
} LogLevel;

#ifndef MEGRAY_LOG_LEVEL
#define MEGRAY_LOG_LEVEL 2
#endif

void MEGRAY_LOG(const char* level, const char* file, int line, const char* fmt, ...);

#define MEGRAY_DEBUG(fmt...)                                         \
    do {                                                             \
        if (MegRay::LogLevel::DEBUG >= MEGRAY_LOG_LEVEL) {           \
            MegRay::MEGRAY_LOG("DEBUG", __FILE__, __LINE__, fmt);    \
        }                                                            \
    } while (0)

#define MEGRAY_INFO(fmt...)                                          \
    do {                                                             \
        if (MegRay::LogLevel::INFO >= MEGRAY_LOG_LEVEL) {            \
            MegRay::MEGRAY_LOG("INFO", __FILE__, __LINE__, fmt);     \
        }                                                            \
    } while (0)

#define MEGRAY_WARN(fmt...)                                          \
    do {                                                             \
        if (MegRay::LogLevel::WARN >= MEGRAY_LOG_LEVEL) {            \
            MegRay::MEGRAY_LOG("WARN", __FILE__, __LINE__, fmt);     \
        }                                                            \
    } while (0)

#define MEGRAY_ERROR(fmt...)                                         \
    do {                                                             \
        if (MegRay::LogLevel::ERROR >= MEGRAY_LOG_LEVEL) {           \
            MegRay::MEGRAY_LOG("ERROR", __FILE__, __LINE__, fmt);    \
        }                                                            \
    } while (0)

class Exception : public std::runtime_error {
    public:
        Exception() = default;
        explicit Exception(const std::string& msg) : std::runtime_error(msg) {}
};

#define MEGRAY_THROW(message) throw MegRay::Exception(message)

#define MEGRAY_ASSERT(expr, fmt...)                         \
    do {                                                    \
        if (!(expr)) {                                      \
            MEGRAY_ERROR("assertion failed: %s", #expr);    \
            MEGRAY_ERROR(fmt);                              \
            MEGRAY_THROW("assertion failed");               \
        }                                                   \
    } while (0)

} // namespace MegRay