/*
 * Copyright (c) 2022-2024, NVIDIA CORPORATION.  All rights reserved.
 *
 * 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.
 */

#pragma once

#include "tensorrt_llm/common/stringUtils.h"

#include <array>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <stdexcept>
#include <string>

#define TLLM_THROW(...)                                                                                                \
    do                                                                                                                 \
    {                                                                                                                  \
        throw NEW_TLLM_EXCEPTION(__VA_ARGS__);                                                                         \
    } while (0)

#define TLLM_WRAP(ex)                                                                                                  \
    NEW_TLLM_EXCEPTION("%s: %s", tensorrt_llm::common::TllmException::demangle(typeid(ex).name()).c_str(), ex.what())

#define NEW_TLLM_EXCEPTION(...)                                                                                        \
    tensorrt_llm::common::TllmException(__FILE__, __LINE__, tensorrt_llm::common::fmtstr(__VA_ARGS__).c_str())

#define TLLM_REQUEST_EXCEPTION(requestID, errorCode, ...)                                                              \
    tensorrt_llm::common::RequestSpecificException(                                                                    \
        __FILE__, __LINE__, tensorrt_llm::common::fmtstr(__VA_ARGS__).c_str(), requestID, errorCode)

namespace tensorrt_llm::common
{

/// @brief Enumeration of different error codes for request-specific exceptions
enum class RequestErrorCode : uint32_t
{
    // General errors (0-999)
    kUNKNOWN_ERROR = 0,

    // Network and communication errors (1000-1999)
    kNETWORK_ERROR = 1000,
};

/// @brief Constant for unknown request ID
static constexpr uint64_t kUNKNOWN_REQUEST_ID = std::numeric_limits<uint64_t>::max();

class TllmException : public std::runtime_error
{
public:
    static auto constexpr MAX_FRAMES = 128;

    explicit TllmException(char const* file, std::size_t line, char const* msg);

    ~TllmException() noexcept override;

    [[nodiscard]] std::string getTrace() const;

    static std::string demangle(char const* name);

private:
    std::array<void*, MAX_FRAMES> mCallstack{};
    int mNbFrames;
};

[[noreturn]] inline void throwRuntimeError(char const* const file, int const line, char const* info)
{
    throw TllmException(file, line, fmtstr("[TensorRT-LLM][ERROR] Assertion failed: %s", info).c_str());
}

[[noreturn]] inline void throwRuntimeError(char const* const file, int const line, std::string const& info = "")
{
    throw TllmException(file, line, fmtstr("[TensorRT-LLM][ERROR] Assertion failed: %s", info.c_str()).c_str());
}

class RequestSpecificException : public std::runtime_error
{
public:
    explicit RequestSpecificException(
        std::string const& file, std::size_t line, char const* msg, uint64_t requestID, RequestErrorCode errorCode);

    ~RequestSpecificException() noexcept override;

    [[nodiscard]] uint64_t getRequestId() const noexcept;

    [[nodiscard]] RequestErrorCode getErrorCode() const noexcept;

private:
    uint64_t mRequestID;
    RequestErrorCode mErrorCode;
};

} // namespace tensorrt_llm::common