import std.stdio;
import core.thread;

enum CONFIG_PATH = "mikoto.cfg";

__gshared bool hasCancelled;

void main() {
    import std.file : exists;
    import std.range : padLeft;
    import std.string : format;

    version(Windows) {
        import core.sys.windows.windows : SetConsoleCtrlHandler, TRUE;
        if(!SetConsoleCtrlHandler(&ctrlHandler, TRUE))
            stderr.writeln("Failed to register Windows CTRL handler.");
    }

    version(Posix) {
        import core.stdc.signal : signal, SIGINT;
        signal(SIGINT, &signalHander);
    }

    if(hasCancelled) return;

    writeln(r"    __  ____ __         __      ");
    writeln(r"   /  |/  (_) /______  / /_____ ");
    writeln(r"  / /|_/ / / //_/ __ \/ __/ __ \");
    writeln(r" / /  / / / ,< / /_/ / /_/ /_/ /");
    writeln(r"/_/  /_/_/_/|_|\____/\__/\____/ ");

    debug writeln("== %s ========= DEBUG ==".format("aabbccddee"));
    else writeln("v0.0.0".padLeft(' ', 30));

    if(hasCancelled) return;

    string configPath = CONFIG_PATH;

    if(!configPath.exists && configPath == CONFIG_PATH)
        createExampleConfig(configPath);

    if(hasCancelled) return;

    for(;;) {
        Thread.sleep(1.seconds);
        if(hasCancelled)
            break;
    }

    writeln("Exiting!");
}

void createExampleConfig(string path) {
    auto cfg = File(path, "wb+");
    cfg.writeln("# and ; can be used at the start of a line for comments.");

    cfg.writeln();
    cfg.writeln("# General Configuration");
    cfg.writeln(";chat:port            {SockChatServer.DEFAULT_PORT}");
    cfg.writeln(";chat:msgMaxLength    {SockChatServer.DEFAULT_MSG_LENGTH_MAX}");
    cfg.writeln(";chat:connMaxCount    {SockChatServer.DEFAULT_MAX_CONNECTIONS}");
    cfg.writeln(";chat:floodKickLength {SockChatServer.DEFAULT_FLOOD_KICK_LENGTH}");

    cfg.writeln();
    cfg.writeln("# Channels");
    cfg.writeln("chat:channels lounge staff");

    cfg.writeln();
    cfg.writeln("# Lounge channel settings");
    cfg.writeln("chat:channels:lounge:name Lounge");
    cfg.writeln("chat:channels:lounge:autoJoin true");

    cfg.writeln();
    cfg.writeln("# Staff channel settings");
    cfg.writeln("chat:channels:staff:name Staff");
    cfg.writeln("chat:channels:staff:minRank 5");

    cfg.writeln();
    cfg.writeln("# Misuzu integration settings");
    cfg.writeln(";msz:secret woomy");
    cfg.writeln(";msz:url    https://flashii.net/_sockchat");

    cfg.writeln();
    cfg.writeln("# MariaDB configuration");
    cfg.writeln(";mariadb:host <host>");
    cfg.writeln(";mariadb:user <username>");
    cfg.writeln(";mariadb:pass <password>");
    cfg.writeln(";mariadb:db   <database>");
}

version(Posix) {
    extern(C) void signalHander(int num) nothrow @nogc @system {
        import core.stdc.signal : SIGINT;

        if(num == SIGINT)
            hasCancelled = true;
    }
}

version(Windows) {
    import core.sys.windows.windows : BOOL, DWORD;

    extern(Windows) BOOL ctrlHandler(DWORD fdwCtrlType) nothrow @nogc @system {
        import core.sys.windows.windows : CTRL_C_EVENT, CTRL_CLOSE_EVENT, TRUE, FALSE;

        switch(fdwCtrlType) {
            case CTRL_C_EVENT:
            case CTRL_CLOSE_EVENT:
                hasCancelled = true;
                return TRUE;

            default:
                return FALSE;
        }
    }
}