// Set this if you don't want MIME types
//#define NO_MIME
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <sys/stat.h>
#include <cstring>
#include <unistd.h>
#ifndef NO_MIME
#include <magic.h>
#endif
#include <string>
#include <vector>
#include <sys/types.h>
#include <dirent.h>

enum FileType {
    Unknown,
    File, Folder,
#ifndef NO_MIME
    Archive, Audio,
    Application,
    Video, Binary,
    Text
#endif
};

std::vector<int> get_files_in_directory(const std::string& path)
{
    DIR* dp = opendir(path.c_str());
    // int normal, hidden;
    int normal[2] = {0,0};
    int hidden[2] = {0,0};
    if (dp != nullptr) {
        struct dirent* ep;
        while((ep = readdir(dp))) {
            // if (ep->d_name[0] != '.') i++;
            if (strcmp(ep->d_name, ".") != 0 && strcmp(ep->d_name, "..") != 0) {
                if (ep->d_name[0] == '.') {
                    hidden[(ep->d_type == DT_DIR) ? 1 : 0]++;
                }else {
                    normal[(ep->d_type == DT_DIR) ? 1 : 0]++;
                }
            }
        }

        (void)closedir(dp);
    }
    else
        perror("Couldn't open the directory");
    std::vector<int> result;
    result.insert(result.end(), normal[0]);
    result.insert(result.end(), normal[1]);
    result.insert(result.end(), hidden[0]);
    result.insert(result.end(), hidden[1]);
    return result;
}

bool starts_with(const std::string& prefix, const std::string& string) {
    return string.rfind(prefix, 0) == 0;
}

bool is_archive(const std::string& mime_type)
{
    const std::string archives[] = {
        "application/x-archive",
        "application/x-cpio",
        "application/x-shar",
        "application/x-iso9660-image",
        "application/x-sbx",
        "application/x-tar",
        "application/x-brotli",
        "application/x-bzip2",
        "application/vnd.genozip",
        "application/gzip",
        "application/x-lzip",
        "application/x-lzma",
        "application/x-lzop",
        "application/x-snappy-framed",
        "application/x-xz",
        "application/x-compress",
        "application/x-compress",
        "application/zstd",
        "application/x-7z-compressed",
        "application/x-ace-compressed",
        "application/x-astrotite-afa",
        "application/x-alz-compressed",
        "application/vnd.android.package-archive",
        "application/x-freearc",
        "application/x-arj",
        "application/x-b1",
        "application/vnd.ms-cab-compressed",
        "application/x-cfs-compressed",
        "application/x-dar",
        "application/x-dgc-compressed",
        "application/x-apple-diskimage",
        "application/x-gca-compressed",
        "application/java-archive",
        "application/x-lzh",
        "application/x-lzx",
        "application/x-rar-compressed",
        "application/x-stuffit",
        "application/x-stuffitx",
        "application/x-gtar",
        "application/x-ms-wim",
        "application/x-xar",
        "application/zip",
        "application/x-zoo"
    };
    int len = sizeof(archives)/sizeof(archives[0]);

    for(int i = 0; i < len; ++i)
    {
        if(starts_with(archives[i], mime_type))
        {
            return true;
        }
    }
    return false;
}

std::string get_name_from_filetype(const enum FileType fs)
{
    switch (fs) {
    #ifndef NO_MIME
    case FileType::Application:
        return "Application";
    case FileType::Archive:
        return "Archive";
    case FileType::Audio:
        return "Audio";
    case FileType::Binary:
        return "Binary";
    #endif
    case FileType::File:
        return "File";
    case FileType::Folder:
        return "Folder";
    #ifndef NO_MIME
    case FileType::Text:
        return "Text";
    case FileType::Video:
        return "Video";
    #endif
    default:
        return "Unknown";
    }
}
std::string get_emoji_from_filetype(const enum FileType fs)
{
    switch (fs) {
    #ifndef NO_MIME
    case FileType::Application:
        return "⚙️";
    case FileType::Archive:
        return "🗜️";
    case FileType::Audio:
        return "🎵";
    case FileType::Binary:
        return "⚙️";
    #endif
    case FileType::File:
        return "📄";
    case FileType::Folder:
        return "📁";
    #ifndef NO_MIME
    case FileType::Text:
        return "📝";
    case FileType::Video:
        return "🎥";
    #endif
    default:
        return "?";
    }
}

std::string readable_fs(const long int size /*in bytes*/, const double divide_by = 1024, const std::string& suffix = "B")
{
    if(size < 1024) {
        char buffer[128];
        sprintf(buffer, "%i B", static_cast<int>(size));
        std::string result(buffer);
        return buffer;
    }
    auto result = static_cast<double>(size);
    int i = 0;
    const std::string units[] = {"", "K", "M", "G", "T", "P", "E", "Z", "Y"};
    while (result > divide_by) {
        result /= divide_by;
        i++;
    }
    char buffer[128];
    sprintf(buffer, "%.*f %s%s", i, result, units[i].c_str(), suffix.c_str());
    std::string str_result(buffer);
    return str_result;
}

#ifndef NO_MIME
std::string get_mime(const std::string& filename)
{
    const char* file_path = filename.c_str();
    const auto magic_cookie = static_cast<const magic_t>(magic_open(MAGIC_MIME_TYPE));
    if (magic_cookie == nullptr) {
        std::cerr << "Unable to initialize libmagic\n";
        return "";
    }

    // Load definitions from the mime types database
    if (magic_load(magic_cookie, nullptr) != 0) {
        std::cerr << "Unable to load database definitions\n";
        magic_close(magic_cookie);
        return "";
    }

    // Determines the MIME type of the file
    const char *mime_type = magic_file(magic_cookie, file_path);
    if (mime_type == nullptr) {
        std::cerr << "Unable to determine the MIME type of the file\n";
        magic_close(magic_cookie);
        return "";
    }

    std::string result(mime_type);

    // Close libmagic
    magic_close(magic_cookie);

    return result;
}
#endif

std::string print_permissions(mode_t mode, bool is_dir) {
    std::string user;
    user += (mode & S_IRUSR) ? "r" : "-";
    user += (mode & S_IWUSR) ? "w" : "-",
    user += (mode & S_IXUSR) ? "x" : "-";

    std::string group;
    group += (mode & S_IRGRP) ? "r" : "-";
    group += (mode & S_IWGRP) ? "w" : "-";
    group += (mode & S_IXGRP) ? "x" : "-";

    std::string other;
    other += (mode & S_IROTH) ? "r" : "-";
    other += (mode & S_IWOTH) ? "w" : "-";
    other += (mode & S_IXOTH) ? "x" : "-";

    
    return (is_dir ? "d" : "-") + user + group + other;
}

std::string basename(const std::string& filepath) {
    return filepath.substr(filepath.find_last_of("/\\") + 1);
}

int main(int argc, char *argv[])
{
    bool absolute = false;
    bool emojis = true;
    // char* filename = "/home/pavlik/Desktop/twrp-3.7.0_9-0-starlte.img";
    if (argc < 2) {
        std::cerr << "Usage:\n\t" << argv[0] << " [args] filename ...\n";
        std::cerr << "Args:" << std::endl;
        std::cerr << "\t-A  Output absolute path" << std::endl;
        std::cerr << "\t-E  Do not show emojis" << std::endl;
        return 255;
    }
    std::vector<std::string> files;
    for (int i = 1; i < argc; ++i) {
        if (argv[i][0] != '-') {
            std::string temp(argv[i]);
            files.insert(files.end(), temp);
        } else {
            std::string arg(argv[i]);
            if(arg == "-A") {
                absolute = true;
            }
            if (arg == "-E") {
                emojis = false;
            }
        }
    }

    size_t last = files.size();
    for (size_t i = 0; i < last; ++i) {
        const std::string& filename = files[i];
        char* c_filename = const_cast<char*>(filename.c_str());

        struct stat file_stat = {};

        if (stat(filename.c_str(), &file_stat) != 0) {
            perror("stat");
            return 1;
        }
        // start
        int is_file = S_ISREG(file_stat.st_mode);
        char temp[4097] = {'\0'};
        if (realpath(c_filename, temp) == nullptr) {
            perror("realpath");
            return 1;
        }
        std::string full_name(temp); // = malloc(4097);
        // delete[] temp;
        std::string name = basename(full_name);
        if(!is_file) name += "/";
        #ifndef NO_MIME
        std::string mime_type = get_mime(full_name);
        #endif
        FileType file;
        #ifdef NO_MIME
        file = (is_file) ? FileType::File : FileType::Folder;
        #else
        if (starts_with("inode/directory", mime_type) || !is_file) {
            file = FileType::Folder;
        } else if (is_archive(mime_type)) {
            file = FileType::Archive;
        } else if (starts_with("application/octet-stream", mime_type)) {
            file = FileType::Binary;
        } else if (starts_with("application", mime_type)) {
            file = FileType::Application;
        } else if (starts_with("audio", mime_type)) {
            file = FileType::Audio;
        } else if (starts_with("video", mime_type)) {
            file = FileType::Video;
        } else if (starts_with("text", mime_type)) {
            file = FileType::Text;
        } else {
            file = FileType::Unknown;
        }
        #endif
        std::string type = get_name_from_filetype(file);
        std::string emoji = get_emoji_from_filetype(file);
        if (emojis) printf("%s  ", emoji.c_str());
        printf("\033[1m%s\033[0m:\n", name.c_str());
        printf("\tName: %s\n", name.c_str());
        printf("\tType: %s\n", type.c_str());
        if (absolute) printf("\tAbsolute path: %s\n", full_name.c_str());
        #ifndef NO_MIME
        printf("\tMIME: %s\n", mime_type.c_str());
        #endif
        if (is_file) {
            std::string _1024 = readable_fs(file_stat.st_size, 1000, "B");
            std::string _1000 = readable_fs(file_stat.st_size, 1024, "iB");
            if (file_stat.st_size >= 1000) printf("\tFile size: %s or %s (%li bytes)\n", _1024.c_str(), _1000.c_str(), file_stat.st_size);
            else printf("\tFile size: %li bytes\n", file_stat.st_size);
        } else {
            auto insides = get_files_in_directory(full_name);
            printf("\tContents:\n");
            printf("\t\tNormal: %i files and %i folders.\n", insides[0], insides[1]);
            printf("\t\tHidden: %i files and %i folders.\n", insides[2], insides[3]);
        }
        printf("\tPermissions: %s\n", print_permissions(file_stat.st_mode, !is_file).c_str());
        if (i != last-1) {
            printf("\n");
        }
    }
    
    return 0;
}