#include "../kerep/src/kprint/kprintf.h"

// option help definition
#define HELP_OPT(ALIASES, PARAMS, DESCRIPTION...) \
    FWHI"    " ALIASES " " PARAMS FGRY "\n" DESCRIPTION

// option parameter help definition
#define HELP_PRM(PNAME) \
    FWHI"[" FCYN PNAME FWHI"]"

// option nullable parameter help definition
#define HELP_PRMN(PNAME) \
    FWHI"[" FCYN PNAME FWHI"?]"

// option parameter1/parameter2 help definition
#define HELP_PRM2(PNAME1, PNAME2) \
    FWHI"[" FCYN PNAME1 FWHI"/" FCYN PNAME2 FWHI"]"

#define HELP_PRM3(PNAME1, PNAME2, PNAME3) \
    FWHI"[" FCYN PNAME1 FWHI"/" FCYN PNAME2 FWHI"/" FCYN PNAME3 FWHI"]"

#define HELP_PRM4(PNAME1, PNAME2, PNAME3, PNAME4) \
    FWHI"[" FCYN PNAME1 FWHI"/" FCYN PNAME2 FWHI"/" FCYN PNAME3 FWHI"/" FCYN PNAME4 FWHI"]"

const char* help_message = (
    FWHI"Usage: port-tunnel " 
            HELP_PRM("protocol_options") " "
            HELP_PRM("input_options") " "
            HELP_PRM("output_options") " "
            HELP_PRMN("other_options") "\n"
    
    FWHI"  Help syntax:\n"
    "    " HELP_PRM("val") FGRY" - some value\n"
    "    " HELP_PRMN("val") FGRY" - value or nothing\n"
    "    " HELP_PRM2("variant1", "variant2") FGRY" - variant1 or variant2\n"

    FWHI"  Protocol options:\n"

    HELP_OPT("-p, --protocol",
        HELP_PRM2("tcp","udp"),
        "      Set tunnel protocol.\n")

    FWHI"  Input mode options:\n"

    HELP_OPT("-l, --listen",
       HELP_PRM("ip") ":" HELP_PRM("port"),
        "      Listen for incomming packets at the address (if provided) and the port\n")

    HELP_OPT("-c, --connect",
        HELP_PRM("ip") ":" HELP_PRM("port") " "
        HELP_PRM2(
            "-s " HELP_PRM("ip") ":" HELP_PRM("port"),
            "-b " HELP_PRM("ip") ":" HELP_PRM("port")
        ),
        "      Connect to a listening instance of port-tunnel.\n")

    FWHI"  Output mode options:\n"

    HELP_OPT("-s, --send-to",
        HELP_PRM("ip") ":" HELP_PRM("port"),
        "      Redirect packets from tunnel to "FCYN"ip:port"FWHI".\n"
        "      Use this flag if you need to create tunnel to an existing socket bound at "FCYN"ip:port"FWHI".\n")

    HELP_OPT("-b, --bind-to",
        HELP_PRM("ip") ":" HELP_PRM("port"),
        "      Bind new socket to "FCYN"ip:port"FWHI" and redirect packets from tunnel to it.\n"
        "      Use this flag if you want to connect something to "FCYN"ip:port"FWHI".\n")

    FWHI"  Other options:\n"

    HELP_OPT("-h, --help, /?", "",
        "      Show this message.\n")

    HELP_OPT("-d, --decrypt",
        HELP_PRM("key"),
        "      Decrypt incoming packets with a key.\n")

    HELP_OPT("-e, --encrypt",
        HELP_PRM("key"),
        "      Encrypt outgoing packets with a key.\n")

    HELP_OPT("-v, --verbosity, --log-level",
        HELP_PRM4("debug", "info", "warning", "error"),
        "      Sets log verbocity level (default=info).\n")
);