/*
MIT License

Copyright (c) 2019 - 2024 Advanced Micro Devices, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include "include_inliner.hpp"
#include <algorithm>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <memory>
#include <sstream>
#include <string>

void Bin2Hex(std::istream& source,
             std::ostream& target,
             const std::string& variable,
             bool nullTerminate,
             size_t bufferSize,
             size_t lineSize)
{
    source.seekg(0, std::ios::end);
    std::unique_ptr<unsigned char[]> buffer(new unsigned char[bufferSize]);
    std::streamoff sourceSize = source.tellg();
    std::streamoff blockStart = 0;

    if(variable.length() != 0)
    {
        target << "const size_t " << variable << "_SIZE = " << std::setbase(10) << sourceSize << ";"
               << std::endl;
        target << "const unsigned char " << variable << "[] = {" << std::endl;
    }

    target << std::setbase(16) << std::setfill('0');
    source.seekg(0, std::ios::beg);

    while(blockStart < sourceSize)
    {
        source.read(reinterpret_cast<char*>(buffer.get()), bufferSize);

        std::streamoff pos       = source.tellg();
        std::streamoff blockSize = (pos < 0 ? sourceSize : pos) - blockStart;
        std::streamoff i         = 0;

        while(i < blockSize)
        {
            size_t j   = i;
            size_t end = std::min<size_t>(i + lineSize, blockSize);

            for(; j < end; j++)
                target << "0x" << std::setw(2) << static_cast<unsigned>(buffer[j]) << ",";

            target << std::endl;
            i = end;
        }

        blockStart += blockSize;
    }

    if(nullTerminate)
        target << "0x00,";

    if(variable.length() != 0)
    {
        target << "};" << std::endl;
    }
}

void PrintHelp()
{
    std::cout << "Usage: bin2hex {<option>}" << std::endl;
    std::cout << "Option format: -<option name>[ <option value>]" << std::endl;
    std::cout << std::endl;
    std::cout << "Options:" << std::endl;
    std::cout
        << "[REQUIRED] -s[ource] {<path to file>}: files to be processed. Must be last argument."
        << std::endl;
    std::cout << "           -t[arget] <path>: target file. Default: std out." << std::endl;
    std::cout << "           -l[ine-size] <number>: bytes in one line. Default: 16." << std::endl;
    std::cout << "           -b[uffer] <number>: read buffer size. Default: 512." << std::endl;
    std::cout << "           -g[uard] <string>: guard name. Default: no guard" << std::endl;
    std::cout << "           -n[o-recurse] : dont expand include files recursively. Default: off"
              << std::endl;
}

[[gnu::noreturn]] void WrongUsage(const std::string& error)
{
    std::cout << "Wrong usage: " << error << std::endl;
    std::cout << std::endl;
    PrintHelp();
    std::exit(1);
}

[[gnu::noreturn]] void UnknownArgument(const std::string& arg)
{
    std::ostringstream ss;
    ss << "unknown argument - " << arg;
    WrongUsage(ss.str());
}

void Process(const std::string& sourcePath,
             std::ostream& target,
             size_t bufferSize,
             size_t lineSize,
             bool recurse)
{
    std::string fileName(sourcePath);
    std::string extension, root;
    std::stringstream inlinerTemp;
    auto extPos   = fileName.rfind('.');
    auto slashPos = fileName.rfind('/');

    if(extPos != std::string::npos)
    {
        extension = fileName.substr(extPos + 1);
        fileName  = fileName.substr(0, extPos);
    }

    if(slashPos != std::string::npos)
    {
        root     = fileName.substr(0, slashPos + 1);
        fileName = fileName.substr(slashPos + 1);
    }

    std::string variable(fileName);
    std::ifstream sourceFile(sourcePath, std::ios::in | std::ios::binary);
    std::istream* source = &sourceFile;

    if(!sourceFile.good())
    {
        std::cerr << "File not found: " << sourcePath << std::endl;
        std::exit(1);
    }

    const auto is_asm    = extension == "s";
    const auto is_cl     = extension == "cl";
    const auto is_hip    = extension == "cpp";
    const auto is_header = extension == "hpp";

    if(is_asm || is_cl || is_hip || is_header)
    {
        IncludeInliner inliner;

        try
        {
            if(is_asm)
                inliner.Process(
                    sourceFile, inlinerTemp, root, sourcePath, ".include", false, recurse);
            else if(is_cl || is_header)
                inliner.Process(
                    sourceFile, inlinerTemp, root, sourcePath, "#include", true, recurse);
            else if(is_hip)
                inliner.Process(
                    sourceFile, inlinerTemp, root, sourcePath, "<#not_include>", true, false);
        }
        catch(const InlineException& ex)
        {
            std::cerr << ex.What() << std::endl;
            std::cerr << ex.GetTrace() << std::endl;
            std::exit(1);
        }

        source = &inlinerTemp;
    }

    std::transform(variable.begin(), variable.end(), variable.begin(), ::toupper);
    Bin2Hex(*source, target, variable, true, bufferSize, lineSize);
}

int main(int argsn, char** args)
{
    if(argsn == 1)
    {
        PrintHelp();
        return 2;
    }

    std::string guard;
    size_t bufferSize = 512;
    size_t lineSize   = 16;

    std::ofstream targetFile;
    std::ostream* target = &std::cout;
    bool recurse         = true;

    int i = 0;
    while(++i < argsn && **args != '-')
    {
        std::string arg(args[i] + 1);
        std::transform(arg.begin(), arg.end(), arg.begin(), ::tolower);

        if(arg == "s" || arg == "source")
        {
            if(guard.length() > 0)
            {
                *target << "#ifndef " << guard << std::endl;
                *target << "#define " << guard << std::endl;
                *target << "#include <stddef.h>" << std::endl;
            }

            while(++i < argsn)
            {
                Process(args[i], *target, bufferSize, lineSize, recurse);
            }

            if(guard.length() > 0)
            {
                *target << "#endif" << std::endl;
            }

            return 0;
        }
        else if(arg == "t" || arg == "target")
        {
            targetFile.open(args[++i], std::ios::out);
            target = &targetFile;
        }
        else if(arg == "l" || arg == "line-size")
            lineSize = std::stol(args[++i]);
        else if(arg == "b" || arg == "buffer")
            bufferSize = std::stol(args[++i]);
        else if(arg == "g" || arg == "guard")
            guard = args[++i];
        else if(arg == "n" || arg == "no-recurse")
            recurse = false;
        else
            UnknownArgument(arg);
    }

    WrongUsage("source key is required");
}
