#include "usage.h"

const char server_callstring[] = "server [-h] [-u] [-a] <path>";
const char server_helpstring[] =
  "    <path>: filesystem path at which to create server Unix domain socket\n"
  "    -u, --username: include username in request output\n"
  "    -a,     --auth: run server in auth mode (implies --username)\n"
  "    -h,     --help: show usage message\n";

const char client_callstring[] = "client [-h] <path> [<message>]";
const char client_helpstring[] =
  "    <path>: filesystem path of target server’s socket\n"
  "    <message>: string to send to server\n"
  "    -h, --help: show usage message\n";

const char *my_name = NULL;

void set_exe_name(char *argv0) {
  my_name = basename(argv0);
  if (my_name == NULL) {
    my_name = "localserv";
  }
}

usage_type usage_context = usage_both;

void set_usage_context(usage_type usage) {
  usage_context = usage;
}

void show_usage(int is_error) {
  if (my_name == NULL) {
    my_name = "localserv";
  }

  FILE *file = is_error ? stderr : stdout;

  if (usage_context == usage_server) {
    fprintf(
      file,
      "usage: %s %s\n\n%s\n",
      my_name,
      server_callstring,
      server_helpstring
    );
  } else if (usage_context == usage_client) {
    fprintf(
      file,
      "usage: %s %s\n\n%s\n",
      my_name,
      client_callstring,
      client_helpstring
    );

  } else { // usage_context == usage_both
    fprintf(
      file,
      "usage:\n"
      "  %s %s\n"
      "  %s %s\n"
      "\n"
      "  server:\n%s\n"
      "  client:\n%s",
      my_name,
      server_callstring,
      my_name,
      client_callstring,
      server_helpstring,
      client_helpstring
    );
  }
}