/**************************************************************************
 *
 * Copyright 2008 VMware, Inc.
 * Copyright (c) 2008 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "util/u_atomic.h"
#include "util/u_debug.h"
#include "util/u_string.h"
#include "util/u_math.h"
#include "c11/threads.h"
#include <inttypes.h>

#include <stdio.h>
#include <limits.h> /* CHAR_BIT */
#include <ctype.h> /* isalnum */

#ifdef _WIN32
#include <windows.h>
#include <stdlib.h>
#endif


void
_debug_vprintf(const char *format, va_list ap)
{
   static char buf[4096] = {'\0'};
#if DETECT_OS_WINDOWS
   /* We buffer until we find a newline. */
   size_t len = strlen(buf);
   int ret = vsnprintf(buf + len, sizeof(buf) - len, format, ap);
   if (ret > (int)(sizeof(buf) - len - 1) || strchr(buf + len, '\n')) {
      os_log_message(buf);
      buf[0] = '\0';
   }
#else
   vsnprintf(buf, sizeof(buf), format, ap);
   os_log_message(buf);
#endif
}


void
_util_debug_message(struct util_debug_callback *cb,
                    unsigned *id,
                    enum util_debug_type type,
                    const char *fmt, ...)
{
   if (!cb || !cb->debug_message)
      return;
   va_list args;
   va_start(args, fmt);
   cb->debug_message(cb->data, id, type, fmt, args);
   va_end(args);
}


#ifdef _WIN32
void
debug_disable_win32_error_dialogs(void)
{
   /* When Windows' error message boxes are disabled for this process (as is
    * typically the case when running tests in an automated fashion) we disable
    * CRT message boxes too.
    */
   UINT uMode = SetErrorMode(0);
   SetErrorMode(uMode);
#ifndef _GAMING_XBOX
   if (uMode & SEM_FAILCRITICALERRORS) {
      /* Disable assertion failure message box.
       * http://msdn.microsoft.com/en-us/library/sas1dkb2.aspx
       */
      _set_error_mode(_OUT_TO_STDERR);
#ifdef _MSC_VER
      /* Disable abort message box.
       * http://msdn.microsoft.com/en-us/library/e631wekh.aspx
       */
      _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
#endif
   }
#endif /* _GAMING_XBOX */
}
#endif /* _WIN32 */

bool
debug_parse_bool_option(const char *str, bool dfault)
{
   bool result;

   if (str == NULL)
      result = dfault;
   else if (!strcmp(str, "0"))
      result = false;
   else if (!strcasecmp(str, "n"))
      result = false;
   else if (!strcasecmp(str, "no"))
      result = false;
   else if (!strcasecmp(str, "f"))
      result = false;
   else if (!strcasecmp(str, "false"))
      result = false;
   else if (!strcmp(str, "1"))
      result = true;
   else if (!strcasecmp(str, "y"))
      result = true;
   else if (!strcasecmp(str, "yes"))
      result = true;
   else if (!strcasecmp(str, "t"))
      result = true;
   else if (!strcasecmp(str, "true"))
      result = true;
   else
      result = dfault;
   return result;
}

static bool
debug_get_option_should_print(void)
{
   static bool initialized = false;
   static bool value = false;

   if (unlikely(!p_atomic_read_relaxed(&initialized))) {
      bool parsed_value = debug_parse_bool_option(os_get_option("GALLIUM_PRINT_OPTIONS"), false);
      p_atomic_set(&value, parsed_value);
      p_atomic_set(&initialized, true);
   }

   /* We do not print value of GALLIUM_PRINT_OPTIONS intentionally. */
   return value;
}


const char *
debug_get_option(const char *name, const char *dfault)
{
   const char *result;

   result = os_get_option(name);
   if (!result)
      result = dfault;

   if (debug_get_option_should_print())
      debug_printf("%s: %s = %s\n", __func__, name,
                   result ? result : "(null)");

   return result;
}


const char *
debug_get_option_cached(const char *name, const char *dfault)
{
   const char *result;

   result = os_get_option_cached(name);
   if (!result)
      result = dfault;

   if (debug_get_option_should_print())
      debug_printf("%s: %s = %s\n", __FUNCTION__, name,
                   result ? result : "(null)");

   return result;
}


/**
 * Reads an environment variable and interprets its value as a boolean.
 * Recognizes 0/n/no/f/false case insensitive as false.
 * Recognizes 1/y/yes/t/true case insensitive as true.
 * Other values result in the default value.
 */
bool
debug_get_bool_option(const char *name, bool dfault)
{
   bool result = debug_parse_bool_option(os_get_option(name), dfault);
   if (debug_get_option_should_print())
      debug_printf("%s: %s = %s\n", __func__, name,
                   result ? "TRUE" : "FALSE");

   return result;
}


int64_t
debug_parse_num_option(const char *str, int64_t dfault)
{
   int64_t result;
   if (!str) {
      result = dfault;
   } else {
      char *endptr;

      result = strtoll(str, &endptr, 0);
      if (str == endptr) {
         /* Restore the default value when no digits were found. */
         result = dfault;
      }
   }
   return result;
}

int64_t
debug_get_num_option(const char *name, int64_t dfault)
{
   int64_t result = debug_parse_num_option(os_get_option(name), dfault);

   if (debug_get_option_should_print())
      debug_printf("%s: %s = %"PRId64"\n", __func__, name, result);

   return result;
}

void
debug_get_version_option(const char *name, unsigned *major, unsigned *minor)
{
   const char *str;

   str = os_get_option(name);
   if (str) {
      unsigned v_maj, v_min;
      int n;

      n = sscanf(str, "%u.%u", &v_maj, &v_min);
      if (n != 2) {
         debug_printf("Illegal version specified for %s : %s\n", name, str);
         return;
      }
      *major = v_maj;
      *minor = v_min;
   }

   if (debug_get_option_should_print())
      debug_printf("%s: %s = %u.%u\n", __func__, name, *major, *minor);

   return;
}

static bool
str_has_option(const char *str, const char *name)
{
   /* Empty string. */
   if (!*str) {
      return false;
   }

   /* OPTION=all */
   if (!strcmp(str, "all")) {
      return true;
   }

   /* Find 'name' in 'str' surrounded by non-alphanumeric characters. */
   {
      const char *start = str;
      unsigned name_len = strlen(name);

      /* 'start' is the beginning of the currently-parsed word,
       * we increment 'str' each iteration.
       * if we find either the end of string or a non-alphanumeric character,
       * we compare 'start' up to 'str-1' with 'name'. */

      while (1) {
         if (!*str || !(isalnum(*str) || *str == '_')) {
            if (str-start == name_len &&
                !memcmp(start, name, name_len)) {
               return true;
            }

            if (!*str) {
               return false;
            }

            start = str+1;
         }

         str++;
      }
   }

   return false;
}


uint64_t
debug_parse_flags_option(const char *name,
                         const char *str,
                         const struct debug_named_value *flags,
                         uint64_t dfault)
{
   uint64_t result;
   const struct debug_named_value *orig = flags;
   unsigned namealign = 0;

   if (!str)
      result = dfault;
   else if (!strcmp(str, "help")) {
      result = dfault;
      _debug_printf("%s: help for %s:\n", __func__, name);
      for (; flags->name; ++flags)
         namealign = MAX2(namealign, strlen(flags->name));
      for (flags = orig; flags->name; ++flags)
         _debug_printf("| %*s [0x%0*"PRIx64"]%s%s\n", namealign, flags->name,
                      (int)sizeof(uint64_t)*CHAR_BIT/4, flags->value,
                      flags->desc ? " " : "", flags->desc ? flags->desc : "");
   }
   else {
      result = 0;
      while (flags->name) {
         if (str_has_option(str, flags->name))
            result |= flags->value;
         ++flags;
      }
   }

   return result;
}

uint64_t
debug_get_flags_option(const char *name,
                       const struct debug_named_value *flags,
                       uint64_t dfault)
{
   const char *str = os_get_option(name);
   uint64_t result = debug_parse_flags_option(name, str, flags, dfault);

   if (debug_get_option_should_print()) {
      if (str) {
         debug_printf("%s: %s = 0x%"PRIx64" (%s)\n",
                      __func__, name, result, str);
      } else {
         debug_printf("%s: %s = 0x%"PRIx64"\n", __func__, name, result);
      }
   }

   return result;
}


const char *
debug_dump_enum(const struct debug_named_value *names,
                uint64_t value)
{
   static char rest[64];

   while (names->name) {
      if (names->value == value)
         return names->name;
      ++names;
   }

   snprintf(rest, sizeof(rest), "0x%08"PRIx64, value);
   return rest;
}


const char *
debug_dump_flags(const struct debug_named_value *names, uint64_t value)
{
   static thread_local char output[4096];
   static thread_local char rest[256];
   int first = 1;

   output[0] = '\0';

   while (names->name) {
      if ((names->value & value) == names->value) {
         if (!first)
            strncat(output, "|", sizeof(output) - strlen(output) - 1);
         else
            first = 0;
         strncat(output, names->name, sizeof(output) - strlen(output) - 1);
         output[sizeof(output) - 1] = '\0';
         value &= ~names->value;
      }
      ++names;
   }

   if (value) {
      if (!first)
         strncat(output, "|", sizeof(output) - strlen(output) - 1);
      else
         first = 0;

      snprintf(rest, sizeof(rest), "0x%08"PRIx64, value);
      strncat(output, rest, sizeof(output) - strlen(output) - 1);
      output[sizeof(output) - 1] = '\0';
   }

   if (first)
      return "0";

   return output;
}


uint64_t
parse_debug_string(const char *debug,
                   const struct debug_control *control)
{
   uint64_t flag = 0;

   if (debug != NULL) {
      for (; control->string != NULL; control++) {
         const char *s = debug;
         unsigned n;

         for (; n = strcspn(s, ", \n"), *s; s += MAX2(1, n)) {
            if (!n)
               continue;

            if (!strncmp("all", s, n) ||
                (strlen(control->string) == n &&
                !strncmp(control->string, s, n)))
               flag |= control->flag;
         }
      }
   }

   return flag;
}


uint64_t
parse_enable_string(const char *debug,
                    uint64_t default_value,
                    const struct debug_control *control)
{
   uint64_t flag = default_value;

   if (debug != NULL) {
      const char *s = debug;
      unsigned n;

      for (; n = strcspn(s, ", \n"), *s; s += MAX2(1, n)) {
         bool enable;
         if (s[0] == '+') {
            enable = true;
            s++; n--;
         } else if (s[0] == '-') {
            enable = false;
            s++; n--;
         } else {
            enable = true;
         }
         if (!strncmp(s, "all", 3)) {
            if (enable)
               flag = ~0ull;
            else
               flag = 0;
         } else {
            for (const struct debug_control *c = control; c->string != NULL; c++) {
               if (strlen(c->string) == n &&
                   !strncmp(c->string, s, n)) {
                  if (enable)
                     flag |= c->flag;
                  else
                     flag &= ~c->flag;
               }
            }
         }
      }
   }

   return flag;
}


bool
comma_separated_list_contains(const char *list, const char *s)
{
   assert(list);
   const size_t len = strlen(s);

   for (unsigned n; n = strcspn(list, ","), *list; list += MAX2(1, n)) {
      if (n == len && !strncmp(list, s, n))
         return true;
   }

   return false;
}

void
dump_debug_control_string(char *output,
                          size_t max_size,
                          const struct debug_control *control,
                          uint64_t flags)
{
   size_t pos = 0;
   int ret;
   bool first = true;

   for (const struct debug_control *c = control; c->string != NULL; c++) {
      if (!(flags & c->flag))
         continue;
      ret = snprintf(output + pos, max_size - pos,
                     first ? "%s" : "|%s", c->string);
      if (ret < 0 || ret >= max_size - pos) {
         output[max_size-3] = output[max_size-2] = '.';
         output[max_size-1] = '\0';
         return;
      }

      pos += ret;
      first = false;
      flags &= ~(c->flag);
   }

   if (flags) {
      ret = snprintf(output + pos, max_size - pos,
                     first ? "0x%" PRIx64 : "|0x%" PRIx64, flags);
      if (ret < 0 || ret >= max_size - pos) {
         output[max_size-3] = output[max_size-2] = '.';
         output[max_size-1] = '\0';
      }
   }
}