/** @file

  A brief file description

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */

/****************************************************************************
Process arguments

****************************************************************************/

#include "tscore/ink_platform.h"
#include "tscore/ink_args.h"
#include "tscore/Diags.h"
#include "tscore/I_Version.h"
#include "tscore/ink_file.h"
#include "tscore/ink_memory.h"
#include "tscore/ink_string.h"

//
//  Global variables
//

const char *file_arguments[MAX_FILE_ARGUMENTS] = {nullptr};
const char *program_name                       = (char *)"Traffic Server";
unsigned n_file_arguments                      = 0;
int cmd_disable_pfreelist                      = 0;

//
//  Local variables
//

static const char *argument_types_keys           = (char *)"ISDfFTL";
static const char *argument_types_descriptions[] = {(char *)"int  ", (char *)"str  ", (char *)"dbl  ", (char *)"off  ",
                                                    (char *)"on   ", (char *)"tog  ", (char *)"i64  ", (char *)"     "};

//
// Functions
//

static bool
arg_is_version_flag(const ArgumentDescription *arg)
{
  return strcmp(arg->name, "version") == 0 && arg->key == 'V';
}

static void
append_file_argument(const char *arg)
{
  if (n_file_arguments >= countof(file_arguments)) {
    ink_fatal("too many files");
  }

  file_arguments[n_file_arguments++] = arg;
}

static bool
process_arg(const AppVersionInfo *appinfo, const ArgumentDescription *argument_descriptions, unsigned n_argument_descriptions,
            int i, const char ***argv)
{
  const char *arg = nullptr;

  if (arg_is_version_flag(&argument_descriptions[i])) {
    ink_fputln(stdout, appinfo->FullVersionInfoStr);
    exit(0);
  }

  if (argument_descriptions[i].type) {
    char type = argument_descriptions[i].type[0];
    if (type == 'F' || type == 'f') {
      *static_cast<int *>(argument_descriptions[i].location) = type == 'F' ? 1 : 0;
    } else if (type == 'T') {
      *static_cast<int *>(argument_descriptions[i].location) = !*static_cast<int *>(argument_descriptions[i].location);
    } else {
      arg = *++(**argv) ? **argv : *++(*argv);
      if (!arg) {
        return false;
      }
      switch (type) {
      case 'I':
        *static_cast<int *>(argument_descriptions[i].location) = atoi(arg);
        break;
      case 'D':
        *static_cast<double *>(argument_descriptions[i].location) = atof(arg);
        break;
      case 'L':
        *static_cast<int64_t *>(argument_descriptions[i].location) = ink_atoi64(arg);
        break;
      case 'S':
        if (argument_descriptions[i].type[1] == '*') {
          char **out = static_cast<char **>(argument_descriptions[i].location);
          *out       = ats_strdup(arg);
        } else {
          ink_strlcpy(static_cast<char *>(argument_descriptions[i].location), arg, atoi(argument_descriptions[i].type + 1));
        }
        break;
      default:
        ink_fatal("bad argument description");
        break;
      }
      **argv += strlen(**argv) - 1;
    }
  }

  if (argument_descriptions[i].pfn) {
    argument_descriptions[i].pfn(argument_descriptions, n_argument_descriptions, arg);
  }

  return true;
}

void
show_argument_configuration(const ArgumentDescription *argument_descriptions, unsigned n_argument_descriptions)
{
  printf("Argument Configuration\n");
  for (unsigned i = 0; i < n_argument_descriptions; i++) {
    if (argument_descriptions[i].type) {
      printf("  %-34s ", argument_descriptions[i].description);
      switch (argument_descriptions[i].type[0]) {
      case 'F':
      case 'f':
      case 'T':
        printf(*static_cast<int *>(argument_descriptions[i].location) ? "TRUE" : "FALSE");
        break;
      case 'I':
        printf("%d", *static_cast<int *>(argument_descriptions[i].location));
        break;
      case 'D':
        printf("%f", *static_cast<double *>(argument_descriptions[i].location));
        break;
      case 'L':
        printf("%" PRId64 "", *static_cast<int64_t *>(argument_descriptions[i].location));
        break;
      case 'S':
        printf("%s", static_cast<char *>(argument_descriptions[i].location));
        break;
      default:
        ink_fatal("bad argument description");
        break;
      }
      printf("\n");
    }
  }
}

void
process_args(const AppVersionInfo *appinfo, const ArgumentDescription *argument_descriptions, unsigned n_argument_descriptions,
             const char **argv, const char *usage_string)
{
  if (!process_args_ex(appinfo, argument_descriptions, n_argument_descriptions, argv)) {
    usage(argument_descriptions, n_argument_descriptions, usage_string);
  }
}

bool
process_args_ex(const AppVersionInfo *appinfo, const ArgumentDescription *argument_descriptions, unsigned n_argument_descriptions,
                const char **argv)
{
  unsigned i = 0;
  //
  // Grab Environment Variables
  //
  for (i = 0; i < n_argument_descriptions; i++) {
    if (argument_descriptions[i].env) {
      char type = argument_descriptions[i].type[0];
      char *env = getenv(argument_descriptions[i].env);
      if (!env) {
        continue;
      }
      switch (type) {
      case 'f':
      case 'F':
      case 'I':
        *static_cast<int *>(argument_descriptions[i].location) = atoi(env);
        break;
      case 'D':
        *static_cast<double *>(argument_descriptions[i].location) = atof(env);
        break;
      case 'L':
        *static_cast<int64_t *>(argument_descriptions[i].location) = atoll(env);
        break;
      case 'S':
        ink_strlcpy(static_cast<char *>(argument_descriptions[i].location), env, atoi(argument_descriptions[i].type + 1));
        break;
      }
    }
  }
  //
  // Grab Command Line Arguments
  //
  program_name = appinfo->AppStr;
  while (*++argv) {
    // Hack for supporting '-' as a file argument.
    if (strcmp(*argv, "-") == 0) {
      append_file_argument(*argv);
      break;
    }

    // No leading '-', this is the start of the file arguments.
    if ((*argv)[0] != '-') {
      append_file_argument(*argv);
      break;
    }

    if ((*argv)[1] == '-') {
      // Deal with long options ...
      for (i = 0; i < n_argument_descriptions; i++) {
        // handle the runroot arg
        std::string_view cur_argv = *argv + 2;
        if (cur_argv.size() >= 8 && cur_argv.substr(0, 8) == "run-root") {
          break;
        }
        // handle the args
        if (!strcmp(argument_descriptions[i].name, (*argv) + 2)) {
          *argv += strlen(*argv) - 1;
          if (!process_arg(appinfo, argument_descriptions, n_argument_descriptions, i, &argv)) {
            return false;
          }
          break;
        }
      }
      if (i >= n_argument_descriptions) {
        return false;
      }
    } else {
      // Deal with (possibly combined) short options ...
      while (*++(*argv)) {
        for (i = 0; i < n_argument_descriptions; i++) {
          if (argument_descriptions[i].key == **argv) {
            if (!process_arg(appinfo, argument_descriptions, n_argument_descriptions, i, &argv)) {
              return false;
            }
            break;
          }
        }

        if (i >= n_argument_descriptions) {
          return false;
        }
      }
    }
  }

  // If we have any arguments left, slurp them up into file_arguments.
  if (*argv) {
    while (*++argv) {
      append_file_argument(*argv);
    }
  }

  return true;
}

void
usage(const ArgumentDescription *argument_descriptions, unsigned n_argument_descriptions, const char *usage_string)
{
  (void)argument_descriptions;
  (void)n_argument_descriptions;
  (void)usage_string;
  if (usage_string) {
    fprintf(stderr, "%s\n", usage_string);
  } else {
    fprintf(stderr, "Usage: %s [--SWITCH [ARG]]\n", program_name);
  }
  fprintf(stderr, "  switch__________________type__default___description\n");
  for (unsigned i = 0; i < n_argument_descriptions; i++) {
    if (!argument_descriptions[i].description) {
      continue;
    }

    fprintf(stderr, "  ");

    if ('-' == argument_descriptions[i].key) {
      fprintf(stderr, "   ");
    } else {
      fprintf(stderr, "-%c,", argument_descriptions[i].key);
    }

    fprintf(stderr, " --%-17s %s", argument_descriptions[i].name,
            argument_types_descriptions[argument_descriptions[i].type ?
                                          strchr(argument_types_keys, argument_descriptions[i].type[0]) - argument_types_keys :
                                          strlen(argument_types_keys)]);
    switch (argument_descriptions[i].type ? argument_descriptions[i].type[0] : 0) {
    case 0:
      fprintf(stderr, "          ");
      break;
    case 'L':
      fprintf(stderr, " %-9" PRId64 "", *static_cast<int64_t *>(argument_descriptions[i].location));
      break;
    case 'S': {
      char *location;
      if (argument_descriptions[i].type[1] == '*') {
        location = *static_cast<char **>(argument_descriptions[i].location);
      } else {
        location = static_cast<char *>(argument_descriptions[i].location);
      }

      if (location) {
        if (strlen(location) < 10) {
          fprintf(stderr, " %-9s", location);
        } else {
          fprintf(stderr, " %-7.7s..", location);
        }
      } else {
        fprintf(stderr, " (null)   ");
      }
      break;
    }
    case 'D':
      fprintf(stderr, " %-9.3f", *static_cast<double *>(argument_descriptions[i].location));
      break;
    case 'I':
      fprintf(stderr, " %-9d", *static_cast<int *>(argument_descriptions[i].location));
      break;
    case 'T':
    case 'f':
    case 'F':
      if (argument_descriptions[i].location) {
        fprintf(stderr, " %-9s", *static_cast<int *>(argument_descriptions[i].location) ? "true " : "false");
      } else {
        fprintf(stderr, " %-9s", "false");
      }
      break;
    }
    fprintf(stderr, " %s\n", argument_descriptions[i].description);
  }
  ::exit(EX_USAGE);
}