/*
* Copyright 2017-2024 NVIDIA Corporation.  All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/

/**
*  This sample application illustrates encoding of frames stored in OpenGL
*  textures. The application reads frames from the input file and uploads them
*  to the textures obtained from the encoder using NvEncoder::GetNextInputFrame().
*  The encoder subsequently maps the textures for encoder using NvEncodeAPI and
*  submits them to NVENC hardware for encoding as part of NvEncoder::EncodeFrame().
*
*  The X server must be running and the DISPLAY environment variable must be
*  set when attempting to run this application.
*/

#include <iostream>
#include <memory>
#include <stdint.h>
#include <cuda.h>
#include "../Utils/Logger.h"
#include "NvEncoder/NvEncoderGL.h"
#include "../Utils/NvEncoderCLIOptions.h"
#include "../Utils/NvCodecUtils.h"
#include "../Common/AppEncUtils.h"
#include "GraphicsUtils.h"

simplelogger::Logger *logger = simplelogger::LoggerFactory::CreateConsoleLogger();

void ShowEncoderGLBriefHelp()
{
    std::ostringstream oss;
    oss << "NVIDIA Video Encoder AppEncGL Sample Application\n";
    oss << "==========================================\n\n";

    oss << "Usage: AppEncGL -i <input_file> [options]\n\n";

    // Brief table of core arguments
    oss << "Common Arguments:\n";
    oss << std::left << std::setw(25) << "Argument"
        << std::setw(12) << "Type"
        << "Default Value\n";
    oss << std::string(50, '-') << "\n";

    oss << std::left << std::setw(25) << "-i <path>"
        << std::setw(12) << "Required"
        << "N/A\n";
    oss << std::left << std::setw(25) << "-o <path>"
        << std::setw(12) << "Optional"
        << "codec-based (out.h264/hevc/av1)\n";
    oss << std::left << std::setw(25) << "-s <WxH>"
        << std::setw(12) << "Required"
        << "N/A\n";
    oss << std::left << std::setw(25) << "-if <format>"
        << std::setw(12) << "Optional"
        << "iyuv\n";

    oss << "\nFor detailed help, use -A/--advanced-options\n";
    oss << "To view encoder capabilities, use -ec/--encode-caps\n";
    std::cout << oss.str();
    exit(0);
}

void ShowEncoderGLDetailedHelp()
{
    std::ostringstream oss;
    oss << "NVIDIA Video Encoder AppEncGL Sample Application - Detailed Help\n";
    oss << "=====================================================\n\n";

    oss << "Usage: AppEncGL -i <input_file> [options]\n\n";

    // Full table of all arguments
    oss << "All Arguments:\n";
    oss << std::left << std::setw(25) << "Argument"
        << std::setw(12) << "Type"
        << std::setw(20) << "Default Value"
        << "Example\n";
    oss << std::string(80, '-') << "\n";

    // Required arguments
    oss << std::left << std::setw(25) << "-i <path>"
        << std::setw(12) << "Required"
        << std::setw(20) << "N/A"
        << "-i input.yuv\n";
    oss << std::left << std::setw(25) << "-s <WxH>"
        << std::setw(12) << "Required"
        << std::setw(20) << "N/A"
        << "-s 1920x1080\n";

    // Optional arguments
    oss << std::left << std::setw(25) << "-o <path>"
        << std::setw(12) << "Optional"
        << std::setw(20) << "codec-based"
        << "-o output.h264\n";
    oss << std::left << std::setw(25) << "-if <format>"
        << std::setw(12) << "Optional"
        << std::setw(20) << "iyuv"
        << "-if iyuv\n";
    oss << std::left << std::setw(25) << "-c <context>"
        << std::setw(12) << "Optional"
        << std::setw(20) << "glx"
        << "-c egl\n";

    // Detailed descriptions
    oss << "\nDetailed Descriptions:\n";
    oss << "-------------------\n";
    oss << std::left << std::setw(25) << "-i" << ": Input file path\n";
    oss << std::left << std::setw(25) << "-o" << ": Output file path\n";
    oss << std::left << std::setw(25) << "-s" << ": Input resolution in WxH format\n";
    oss << std::left << std::setw(25) << "-if" << ": Input format (iyuv/nv12)\n";
    oss << std::left << std::setw(25) << "-c" << ": GL context type (glx/egl)\n";
    oss << std::left << std::setw(25) << "-h/--help" << ": Print basic usage information\n";
    oss << std::left << std::setw(25) << "-A/--advanced-options" << ": Print detailed usage information\n";
    oss << std::left << std::setw(25) << "-ec/--encode-caps" << ": Print encode capabilities of GPU\n";

    // Important notes
    oss << "\nNotes:\n";
    oss << "------\n";
    oss << "* Width and height must be specified for encoding\n";
    oss << "* Default context type is glx\n";
    oss << std::endl;

    oss << NvEncoderInitParam().GetHelpMessage(false, false, true, false, false, true, false, false) << std::endl;
    oss << "\nTo view encode capabilities, use -ec/--encode-caps\n";
    std::cout << oss.str();
    exit(0);
}

void ShowHelpAndExit(const char *szBadOption = NULL)
{
    if (szBadOption)
    {
        std::ostringstream oss;
        oss << "Error parsing \"" << szBadOption << "\"\n";
        oss << "Use -h/--help for basic usage or -A/--advanced-options for detailed information\n";
        throw std::invalid_argument(oss.str());
    }
}

void ParseCommandLine(int argc, char *argv[], char *szInputFileName, int &nWidth, int &nHeight,
    NV_ENC_BUFFER_FORMAT &eFormat, char *szOutputFileName, NvEncoderInitParam &initParam, char* contextType)
{
    std::ostringstream oss;
    int i;

    if (argc == 1) {
        std::cout << "No Arguments provided! Please refer to the following for options:\n";
        ShowEncoderGLBriefHelp();
    }

    for (i = 1; i < argc; i++)
    {
        if (!_stricmp(argv[i], "-h") || !_stricmp(argv[i], "--help")) {
            ShowEncoderGLBriefHelp();
        }
        if (!_stricmp(argv[i], "-A") || !_stricmp(argv[i], "--advanced-options")) {
            ShowEncoderGLDetailedHelp();
        }
        if (!_stricmp(argv[i], "-ec") || !_stricmp(argv[i], "--encode-caps")) {
            ShowEncoderCapability();
        }
        if (!_stricmp(argv[i], "-i"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-i");
            }
            sprintf(szInputFileName, "%s", argv[i]);
            continue;
        }
        if (!_stricmp(argv[i], "-o"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-o");
            }
            sprintf(szOutputFileName, "%s", argv[i]);
            continue;
        }
        if (!_stricmp(argv[i], "-s"))
        {
            if (++i == argc || 2 != sscanf(argv[i], "%dx%d", &nWidth, &nHeight))
            {
                ShowHelpAndExit("-s");
            }
            continue;
        }
        if (!_stricmp(argv[i], "-c"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-c");
            }
            snprintf(contextType, 4, "%s", argv[i]);
            continue;
        }

        std::vector<std::string> vszFileFormatName = { "iyuv", "nv12" };

        NV_ENC_BUFFER_FORMAT aFormat[] =
        {
            NV_ENC_BUFFER_FORMAT_IYUV,
            NV_ENC_BUFFER_FORMAT_NV12,
        };

        if (!_stricmp(argv[i], "-if"))
        {
            if (++i == argc)
            {
                ShowHelpAndExit("-if");
            }
            auto it = std::find(vszFileFormatName.begin(), vszFileFormatName.end(), argv[i]);
            if (it == vszFileFormatName.end())
            {
                ShowHelpAndExit("-if");
            }
            eFormat = aFormat[it - vszFileFormatName.begin()];
            continue;
        }
        // Regard as encoder parameter
        if (argv[i][0] != '-')
        {
            ShowHelpAndExit(argv[i]);
        }
        oss << argv[i] << " ";
        while (i + 1 < argc && argv[i + 1][0] != '-')
        {
            oss << argv[++i] << " ";
        }
    }
    initParam = NvEncoderInitParam(oss.str().c_str());
}

void EncodeGL(char *szInFilePath, char *szOutFilePath, int nWidth, int nHeight,
    NV_ENC_BUFFER_FORMAT eFormat, NvEncoderInitParam *encodeCLIOptions)
{
    std::ifstream fpIn(szInFilePath, std::ifstream::in | std::ifstream::binary);
    if (!fpIn)
    {
        std::ostringstream err;
        err << "Unable to open input file: " << szInFilePath << std::endl;
        throw std::invalid_argument(err.str());
    }

    std::ofstream fpOut(szOutFilePath, std::ios::out | std::ios::binary);
    if (!fpOut)
    {
        std::ostringstream err;
        err << "Unable to open output file: " << szOutFilePath << std::endl;
        throw std::invalid_argument(err.str());
    }

    NvEncoderGL enc(nWidth, nHeight, eFormat);

    NV_ENC_INITIALIZE_PARAMS initializeParams = { NV_ENC_INITIALIZE_PARAMS_VER };
    NV_ENC_CONFIG encodeConfig = { NV_ENC_CONFIG_VER };
    initializeParams.encodeConfig = &encodeConfig;
    enc.CreateDefaultEncoderParams(&initializeParams, encodeCLIOptions->GetEncodeGUID(),
        encodeCLIOptions->GetPresetGUID(),encodeCLIOptions->GetTuningInfo());

    encodeCLIOptions->SetInitParams(&initializeParams, eFormat);

    enc.CreateEncoder(&initializeParams);

    int nFrameSize = enc.GetFrameSize();
    std::unique_ptr<uint8_t[]> pHostFrame(new uint8_t[nFrameSize]);
    int nFrame = 0;
    while (true)
    {
        std::streamsize nRead = fpIn.read(reinterpret_cast<char*>(pHostFrame.get()), nFrameSize).gcount();

        const NvEncInputFrame* encoderInputFrame = enc.GetNextInputFrame();
        NV_ENC_INPUT_RESOURCE_OPENGL_TEX *pResource = (NV_ENC_INPUT_RESOURCE_OPENGL_TEX *)encoderInputFrame->inputPtr;

        glBindTexture(pResource->target, pResource->texture);
        glTexSubImage2D(pResource->target, 0, 0, 0,
            nWidth, nHeight * 3 / 2,
            GL_RED, GL_UNSIGNED_BYTE, pHostFrame.get());
        glBindTexture(pResource->target, 0);

        std::vector<NvEncOutputFrame> vPacket;
        if (nRead == nFrameSize)
        {
            enc.EncodeFrame(vPacket);
        }
        else
        {
            enc.EndEncode(vPacket);
        }
        nFrame += (int)vPacket.size();
        for (NvEncOutputFrame &packet : vPacket)
        {
            fpOut.write(reinterpret_cast<char*>(packet.frame.data()), packet.frame.size());
        }
        if (nRead != nFrameSize) break;
    }

    enc.DestroyEncoder();

    fpOut.close();
    fpIn.close();

    std::cout << "Total frames encoded: " << nFrame << std::endl;
    std::cout << "Saved in file " << szOutFilePath << std::endl;
}

int main(int argc, char **argv)
{
    char szInFilePath[256] = "",
        szOutFilePath[256] = "",
        contextType[4] = "glx";

    int nWidth = 0, nHeight = 0;
    NV_ENC_BUFFER_FORMAT eFormat = NV_ENC_BUFFER_FORMAT_IYUV;
    NvEncoderInitParam encodeCLIOptions;

    try
    {
        ParseCommandLine(argc, argv, szInFilePath, nWidth, nHeight, eFormat,
            szOutFilePath, encodeCLIOptions, contextType);

        GraphicsSetupWindow(contextType);

        CheckInputFile(szInFilePath);
        ValidateResolution(nWidth, nHeight);

        if (!*szOutFilePath)
        {
            sprintf(szOutFilePath, encodeCLIOptions.IsCodecH264() ? "out.h264" : encodeCLIOptions.IsCodecHEVC() ? "out.hevc" : "out.av1");
        }

        EncodeGL(szInFilePath, szOutFilePath, nWidth, nHeight, eFormat, &encodeCLIOptions);
    }
    catch (const std::exception &e)
    {
        std::cout << e.what();
        return 1;
    }

    GraphicsCloseWindow(contextType);

    return 0;
}