/*

 * Copyright (c) 2020, Alliance for Open Media. All rights reserved.

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

 */

#include "common/args_helper.h"

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#define SET_ERR_STRING(...) \

  if (err_msg) snprintf(err_msg, ARG_ERR_MSG_MAX_LEN, __VA_ARGS__)

static struct arg arg_init(char **argv) {

  struct arg a;

  a.argv = argv;

  a.argv_step = 1;

  a.name = NULL;

  a.val = NULL;

  a.def = NULL;

  return a;

}

int arg_match_helper(struct arg *arg_, const struct arg_def *def, char **argv,

                     char *err_msg) {

  struct arg arg;

  if (err_msg) err_msg[0] = '\0';

  assert(def->has_val == 0 || def->has_val == 1 || def->has_val == -1);

  if (!argv[0] || argv[0][0] != '-') return 0;

  arg = arg_init(argv);

  if (def->short_name && !strcmp(arg.argv[0] + 1, def->short_name)) {

    arg.name = arg.argv[0] + 1;

    arg.val = def->has_val ? arg.argv[1] : NULL;

    arg.argv_step = def->has_val ? 2 : 1;

  } else if (def->long_name) {

    const size_t name_len = strlen(def->long_name);

    if (arg.argv[0][1] == '-' &&

        !strncmp(arg.argv[0] + 2, def->long_name, name_len) &&

        (arg.argv[0][name_len + 2] == '=' ||

         arg.argv[0][name_len + 2] == '\0')) {

      arg.name = arg.argv[0] + 2;

      arg.val = arg.name[name_len] == '=' ? arg.name + name_len + 1 : NULL;

      arg.argv_step = 1;

    }

  }

  if (arg.name) {

    if (def->has_val == -1) {

      arg.def = def;

      *arg_ = arg;

      return 1;

    }

    if (!arg.val && def->has_val) {

      SET_ERR_STRING("Error: option %s requires argument.\n", arg.name);

      return 0;

    }

    if (arg.val && !def->has_val) {

      SET_ERR_STRING("Error: option %s requires no argument.\n", arg.name);

      return 0;

    }

    arg.def = def;

    *arg_ = arg;

    return 1;

  }

  return 0;

}

unsigned int arg_parse_uint_helper(const struct arg *arg, char *err_msg) {

  char *endptr;

  const unsigned long rawval = strtoul(arg->val, &endptr, 10);  // NOLINT

  if (err_msg) err_msg[0] = '\0';

  if (arg->val[0] != '\0' && endptr[0] == '\0') {

    if (rawval <= UINT_MAX) return (unsigned int)rawval;

    SET_ERR_STRING("Option %s: Value %lu out of range for unsigned int\n",

                   arg->name, rawval);

    return 0;

  }

  SET_ERR_STRING("Option %s: Invalid character '%c'\n", arg->name, *endptr);

  return 0;

}

int arg_parse_int_helper(const struct arg *arg, char *err_msg) {

  char *endptr;

  const long rawval = strtol(arg->val, &endptr, 10);  // NOLINT

  if (err_msg) err_msg[0] = '\0';

  if (arg->val[0] != '\0' && endptr[0] == '\0') {

    if (rawval >= INT_MIN && rawval <= INT_MAX) return (int)rawval;

    SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",

                   arg->name, rawval);

    return 0;

  }

  SET_ERR_STRING("Option %s: Invalid character '%c'\n", arg->name, *endptr);

  return 0;

}

struct aom_rational arg_parse_rational_helper(const struct arg *arg,

                                              char *err_msg) {

  long rawval;  // NOLINT

  char *endptr;

  struct aom_rational rat = { 0, 1 };

  if (err_msg) err_msg[0] = '\0';

  /* parse numerator */

  rawval = strtol(arg->val, &endptr, 10);

  if (arg->val[0] != '\0' && endptr[0] == '/') {

    if (rawval >= INT_MIN && rawval <= INT_MAX) {

      rat.num = (int)rawval;

    } else {

      SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",

                     arg->name, rawval);

      return rat;

    }

  } else {

    SET_ERR_STRING("Option %s: Expected / at '%c'\n", arg->name, *endptr);

    return rat;

  }

  /* parse denominator */

  rawval = strtol(endptr + 1, &endptr, 10);

  if (arg->val[0] != '\0' && endptr[0] == '\0') {

    if (rawval >= INT_MIN && rawval <= INT_MAX) {

      rat.den = (int)rawval;

    } else {

      SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",

                     arg->name, rawval);

      return rat;

    }

  } else {

    SET_ERR_STRING("Option %s: Invalid character '%c'\n", arg->name, *endptr);

    return rat;

  }

  return rat;

}

int arg_parse_enum_helper(const struct arg *arg, char *err_msg) {

  const struct arg_enum_list *listptr;

  long rawval;  // NOLINT

  char *endptr;

  if (err_msg) err_msg[0] = '\0';

  /* First see if the value can be parsed as a raw value */

  rawval = strtol(arg->val, &endptr, 10);

  if (arg->val[0] != '\0' && endptr[0] == '\0') {

    /* Got a raw value, make sure it's valid */

    for (listptr = arg->def->enums; listptr->name; listptr++)

      if (listptr->val == rawval) return (int)rawval;

  }

  /* Next see if it can be parsed as a string */

  for (listptr = arg->def->enums; listptr->name; listptr++)

    if (!strcmp(arg->val, listptr->name)) return listptr->val;

  SET_ERR_STRING("Option %s: Invalid value '%s'\n", arg->name, arg->val);

  return 0;

}

int arg_parse_enum_or_int_helper(const struct arg *arg, char *err_msg) {

  if (arg->def->enums) return arg_parse_enum_helper(arg, err_msg);

  return arg_parse_int_helper(arg, err_msg);

}

// parse a comma separated list of at most n integers

// return the number of elements in the list

int arg_parse_list_helper(const struct arg *arg, int *list, int n,

                          char *err_msg) {

  const char *ptr = arg->val;

  char *endptr;

  int i = 0;

  if (err_msg) err_msg[0] = '\0';

  while (ptr[0] != '\0') {

    long rawval = strtol(ptr, &endptr, 10);  // NOLINT

    if (rawval < INT_MIN || rawval > INT_MAX) {

      SET_ERR_STRING("Option %s: Value %ld out of range for signed int\n",

                     arg->name, rawval);

      return 0;

    } else if (i >= n) {

      SET_ERR_STRING("Option %s: List has more than %d entries\n", arg->name,

                     n);

      return 0;

    } else if (*endptr == ',') {

      endptr++;

    } else if (*endptr != '\0') {

      SET_ERR_STRING("Option %s: Bad list separator '%c'\n", arg->name,

                     *endptr);

      return 0;

    }

    list[i++] = (int)rawval;

    ptr = endptr;

  }

  return i;

}