#include "ResourceFile.h"
#include "BinaryIO.h"

#include <boost/filesystem.hpp>
#include "boost/filesystem/fstream.hpp"
#include <chrono>
#include <ctime>
#include <sstream>
#include <iostream>

#ifdef __APPLE__
#include <sys/xattr.h>
#endif
extern "C" {
#include "hfs.h"
}

namespace fs = boost::filesystem;

// CRC 16 table lookup array
static unsigned short CRC16Table[256] =
    {0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
    0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
    0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
    0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
    0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
    0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
    0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
    0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
    0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
    0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
    0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
    0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
    0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
    0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
    0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
    0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
    0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
    0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
    0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
    0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
    0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
    0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0};

// CalculateCRC
static unsigned short CalculateCRC(unsigned short CRC, const char* dataBlock, int dataSize)
{
    while (dataSize)
    {
        CRC = (CRC << 8) ^ CRC16Table[((*dataBlock) ^ (CRC >> 8)) & 0x00FF];
        dataBlock++;
        dataSize--;
    }

    return CRC;
}

static void writeMacBinary(std::ostream& out, std::string filename,
                           ResType type, ResType creator,
                           const Resources& rsrc, const std::string& data)
{

    std::ostringstream resstream;
    rsrc.writeFork(resstream);

    const std::string& rsrcBytes = resstream.str();

    // MacBinary files contain mandatory timestamps (creation date and modification date)
    // We set both of them, but to make reproducible builds possible, this optionally
    // takes the time from the $SOURCE_DATE_EPOCH environment variable instead of the system clock.
    // When building under `nix`, this is automatically set to the modification date of the newest source
    // file.
    auto timestamp = std::invoke([&] -> std::chrono::system_clock::time_point {
        const char *sourceDateEpochEnvVar = getenv("SOURCE_DATE_EPOCH");
        if (sourceDateEpochEnvVar && *sourceDateEpochEnvVar)
            return std::chrono::system_clock::from_time_t((time_t)std::atoll(sourceDateEpochEnvVar));
        else
            return std::chrono::system_clock::now();
    });

    // Calculate Mac-style timestamp (seconds since 1 January 1904 00:00:00)
    std::tm mac_epoch_tm = {
        0, 0, 0, // 00:00:00
        1, 0, 4  // 1 January 1904
    };
    auto mac_epoch = std::chrono::system_clock::from_time_t(std::mktime(&mac_epoch_tm));
    uint32_t mac_time = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now() - mac_epoch).count();

    std::ostringstream header;
    byte(header, 0);
    byte(header, filename.size());
    header << filename;
    while((int)header.tellp() < 65)
        byte(header,0);
    ostype(header, type);
    ostype(header, creator);
    byte(header, 0); // flags
    byte(header, 0);
    word(header, 0);  // position.v
    word(header, 0); // position.h
    word(header, 0); // folder id
    byte(header, 0); // protected flag
    byte(header, 0);
    longword(header, (int)data.size());
    longword(header, (int)rsrcBytes.size());
    longword(header, mac_time); // creation date
    longword(header, mac_time); // modification date
    while((int)header.tellp() < 124)
        byte(header,0);
    std::string headerData = header.str();
    out << headerData;
    word(out, CalculateCRC(0, &headerData[0], headerData.size()));
    word(out, 0);
    out << data;
    while((int)out.tellp() % 128)
        byte(out,0);
    rsrc.writeFork(out);
    while((int)out.tellp() % 128)
        byte(out,0);
}

bool ResourceFile::read(std::string path, Format f)
{
    if(!assign(path, f))
        return false;
    return read();
}

bool ResourceFile::write(std::string path, Format f)
{
    if(!assign(path, f))
        return false;
    return write();
}

static bool CheckAppleDouble(fs::path path, std::string prefix)
{
    fs::path adPath = path.parent_path() / (prefix  + path.filename().string());
    fs::ifstream in(adPath);
    if(in)
    {
        int magic1 = longword(in);

        if(in && magic1 == 0x00051607)
        {
            int magic2 = longword(in);
            if(in && magic2 == 0x00020000)
                return true;
        }
    }
    return false;
}

bool ResourceFile::assign(std::string pathstring, ResourceFile::Format f)
{
    this->pathstring = pathstring;
    fs::path path(pathstring);

    this->filename = path.stem().string();
    fs::path rsrcPath = path.parent_path() / ".rsrc" / path.filename();
    fs::path finfPath = path.parent_path() / ".finf" / path.filename();

    format = f;
    if(format == Format::autodetect)
    {
        if(path.extension() == ".bin")
            format = Format::macbin;
        else if(path.extension() == ".as")
            format = Format::applesingle;
        else if(path.extension() == ".dsk")
            format = Format::diskimage;
        else if(path.filename().string().substr(0,2) == "._")
        {
            path = path.parent_path() / path.filename().string().substr(2);
            format = Format::underscore_appledouble;
            this->pathstring = path.string();
        }
        else if(path.filename().string()[0] == '%')
        {
            path = path.parent_path() / path.filename().string().substr(1);
            format = Format::percent_appledouble;
            this->pathstring = path.string();
        }
        //else if(fs::exists(rsrcPath))
        //    format = Format::basilisk;
    }
    if(format == Format::autodetect)
    {
        if(CheckAppleDouble(path, "._"))
            format = Format::underscore_appledouble;
        if(CheckAppleDouble(path, "%"))
            format = Format::percent_appledouble;
    }
    if(format == Format::autodetect)
    {
        fs::ifstream in(path);
        if(in)
        {
            int magic1 = longword(in);
            if(in && magic1 == 0x00051600)
            {
                int magic2 = longword(in);
                if(in && magic2 == 0x00020000)
                    format = Format::applesingle;
            }
        }
    }
    if(format == Format::autodetect)
    {
#ifdef __APPLE__
        format = Format::real;
#else
        format = Format::basilisk;
#endif
    }
//    std::cout << "assigned: " << pathstring << " format " << (int)format << "\n";
    return true;
}

bool ResourceFile::read(std::istream& in, Format f)
{
    switch(f)
    {
        case Format::applesingle:
            {
                if(longword(in) != 0x00051600)
                    return false;
                if(longword(in) != 0x00020000)
                    return false;
                in.seekg(24);
                int n = word(in);
                for(int i = 0; i < n; i++)
                {
                    in.seekg(26 + i * 12);
                    int what = longword(in);
                    int off = longword(in);
                    int len = longword(in);
                    in.seekg(off);
                    switch(what)
                    {
                        case 1:
                            {
                                std::vector<char> buf(len);
                                in.read(buf.data(), len);
                                data = std::string(buf.begin(), buf.end());
                            }
                            break;
                        case 2:
                            resources = Resources(in);
                            break;
                        case 9:
                            type = ostype(in);
                            creator = ostype(in);
                            break;
                    }
                }
            }
            break;
        case Format::macbin:
            {
                if(byte(in) != 0)
                    return false;
                if(byte(in) > 63)
                    return false;
                in.seekg(65);
                type = ostype(in);
                creator = ostype(in);
                in.seekg(83);
                int datasize = longword(in);
                //int rsrcsize = longword(in);

                in.seekg(0);
                char header[124];
                in.read(header, 124);
                unsigned short crc = CalculateCRC(0,header,124);
                if(word(in) != crc)
                    return false;
                in.seekg(128);
                std::vector<char> buf(datasize);
                in.read(buf.data(), datasize);
                data = std::string(buf.begin(), buf.end());
                datasize = ((int)datasize + 0x7F) & ~0x7F;
                in.seekg(128 + datasize);
                resources = Resources(in);
            }
            break;
        default:
            return false;
    }
    return true;
}

bool ResourceFile::read()
{
    fs::path path(pathstring);

    type = creator = 0x3F3F3F3F;

    if(isSingleFork(format))
    {
        fs::ifstream in(path);
        return read(in, format);
    }

    switch(format)
    {
        case Format::basilisk:
            {
                fs::ifstream dataIn(path);
                if(!dataIn)
                    return false;
                data = std::string(std::istreambuf_iterator<char>(dataIn),
                                   std::istreambuf_iterator<char>());

                fs::ifstream rsrcIn(path.parent_path() / ".rsrc" / path.filename());
                if(rsrcIn)
                    resources = Resources(rsrcIn);
                fs::ifstream finfIn(path.parent_path() / ".finf" / path.filename());
                if(finfIn)
                {
                    type = ostype(finfIn);
                    creator = ostype(finfIn);
                }
            }
            break;
#ifdef __APPLE__
        case Format::real:
            {
                fs::ifstream dataIn(path);
                if(!dataIn)
                    return false;
                data = std::string(std::istreambuf_iterator<char>(dataIn),
                                   std::istreambuf_iterator<char>());
                fs::ifstream rsrcIn(path / "..namedfork" / "rsrc");
                if(rsrcIn)
                    resources = Resources(rsrcIn);

                char finf[32];
                int n = getxattr(path.c_str(), XATTR_FINDERINFO_NAME,
                        finf, 32, 0, 0);
                if(n > 0)
                {
                    std::istringstream finfIn(std::string(finf, finf+n));
                    type = ostype(finfIn);
                    creator = ostype(finfIn);
                }
            }
            break;
#endif

        case Format::underscore_appledouble:
        case Format::percent_appledouble:
            {
                fs::ifstream dataIn(path);
                data = std::string(std::istreambuf_iterator<char>(dataIn),
                                   std::istreambuf_iterator<char>());

                std::string prefix = format == Format::underscore_appledouble ?
                                        "._" : "%";

                fs::path adPath = path.parent_path() / (prefix  + path.filename().string());
                fs::ifstream in(adPath);
                if(longword(in) != 0x00051607)
                    return false;
                if(longword(in) != 0x00020000)
                    return false;
                in.seekg(24);
                int n = word(in);
                for(int i = 0; i < n; i++)
                {
                    in.seekg(26 + i * 12);
                    int what = longword(in);
                    int off = longword(in);
                    //int len = longword(in);
                    in.seekg(off);
                    switch(what)
                    {
                        case 2:
                            resources = Resources(in);
                            break;
                        case 9:
                            type = ostype(in);
                            creator = ostype(in);
                            break;
                    }
                }
            }
            break;
        default:
            return false;
    }
    return true;
}

bool ResourceFile::write(std::ostream& out, Format f)
{
    switch(f)
    {
        case Format::macbin:
            {
                writeMacBinary(out, filename, type, creator, resources, data);
            }
            break;
        case Format::applesingle:
            {
                longword(out, 0x00051600);
                longword(out, 0x00020000);
                for(int i = 0; i < 16; i++)
                    byte(out, 0);
                word(out, 3);
                std::streampos entries = out.tellp();
                for(int i = 0; i < 3*3; i++)
                    longword(out, 0);
                std::streampos dataStart = out.tellp();
                out << data;
                std::streampos rsrcStart = out.tellp();
                resources.writeFork(out);
                std::streampos finfStart = out.tellp();
                ostype(out, type);
                ostype(out, creator);
                for(int i = 8; i < 32; i++)
                    byte(out, 0);
                out.seekp(entries);
                longword(out, 1);
                longword(out, dataStart);
                longword(out, rsrcStart - dataStart);
                longword(out, 2);
                longword(out, rsrcStart);
                longword(out, finfStart - rsrcStart);
                longword(out, 9);
                longword(out, finfStart);
                longword(out, 32);
            }
            break;
        default:
            return false;
    }
    return true;
}

bool ResourceFile::write()
{
    fs::path path(pathstring);

    if(isSingleFork(format))
    {
        fs::ofstream out(path);
        return write(out, format);
    }

    switch(format)
    {
        case Format::basilisk:
            {
                fs::create_directory(path.parent_path() / ".rsrc");
                fs::create_directory(path.parent_path() / ".finf");

                fs::ofstream dataOut(path);
                fs::ofstream rsrcOut(path.parent_path() / ".rsrc" / path.filename());
                fs::ofstream finfOut(path.parent_path() / ".finf" / path.filename());

                dataOut << data;
                resources.writeFork(rsrcOut);

                ostype(finfOut, type);
                ostype(finfOut, creator);
                for(int i = 8; i < 32; i++)
                    byte(finfOut, 0);
            }
            break;
#ifdef __APPLE__
        case Format::real:
            {
                fs::ofstream dataOut(path);
                fs::ofstream rsrcOut(path / "..namedfork" / "rsrc");
                std::ostringstream finfOut;

                dataOut << data;
                resources.writeFork(rsrcOut);

                ostype(finfOut, type);
                ostype(finfOut, creator);
                for(int i = 8; i < 32; i++)
                    byte(finfOut, 0);
                setxattr(path.c_str(), XATTR_FINDERINFO_NAME,
                        finfOut.str().data(), 32, 0, 0);
            }
            break;
#endif

        case Format::underscore_appledouble:
        case Format::percent_appledouble:
            {
                fs::ofstream dataOut(path);

                dataOut << data;

                std::string prefix = format == Format::underscore_appledouble ?
                                        "._" : "%";

                fs::path adPath = path.parent_path() / (prefix  + path.filename().string());

                fs::ofstream out(adPath);

                longword(out, 0x00051607);
                longword(out, 0x00020000);

                for(int i = 0; i < 16; i++)
                    byte(out, 0);
                word(out, 2);
                std::streampos entries = out.tellp();
                for(int i = 0; i < 2*3; i++)
                    longword(out, 0);
                std::streampos rsrcStart = out.tellp();
                resources.writeFork(out);
                std::streampos finfStart = out.tellp();
                ostype(out, type);
                ostype(out, creator);
                for(int i = 8; i < 32; i++)
                    byte(out, 0);
                out.seekp(entries);
                longword(out, 2);
                longword(out, rsrcStart);
                longword(out, finfStart - rsrcStart);
                longword(out, 9);
                longword(out, finfStart);
                longword(out, 32);
            }
            break;

        case Format::diskimage:
            {
                std::ostringstream rsrcOut;
                resources.writeFork(rsrcOut);
                std::string rsrc = rsrcOut.str();
                int size = rsrc.size() + data.size();

                size += 20 * 1024;
                size += 800*1024 - size % (800*1024);

                fs::ofstream(path, std::ios::binary | std::ios::trunc).seekp(size-1).put(0);

                hfs_format(pathstring.c_str(), 0, 0, path.stem().string().substr(0,27).c_str(), 0, NULL);
                hfsvol *vol = hfs_mount(pathstring.c_str(), 0, HFS_MODE_RDWR);
                if(!vol)
                    return false;
                //hfs_setvol(vol, )
                hfsfile *file = hfs_create(vol, (path.stem().string().substr(0,31)).c_str(),
                                           ((std::string)type).c_str(), ((std::string)creator).c_str());
                hfs_setfork(file, 0);
                hfs_write(file, data.data(), data.size());
                hfs_setfork(file, 1);
                hfs_write(file, rsrc.data(), rsrc.size());

                hfs_close(file);
                hfs_umount(vol);

            }
            break;

        default:
            return false;
    }
    return true;
}

bool ResourceFile::hasPlainDataFork(ResourceFile::Format f)
{
    switch(f)
    {
#ifdef __APPLE__
        case Format::real:
#endif
        case Format::basilisk:
        case Format::underscore_appledouble:
        case Format::percent_appledouble:
            return true;
        default:
            return false;
    }
}

bool ResourceFile::hasPlainDataFork()
{
    return hasPlainDataFork(format);
}

bool ResourceFile::isSingleFork(Format f)
{
    switch(f)
    {
        case Format::macbin:
        case Format::applesingle:
            return true;
        default:
            return false;
    }
}