/**

 * WinPR: Windows Portable Runtime

 * WinPR Logger

 *

 * Copyright 2013 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed 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.

 */

#include <winpr/config.h>

#include <stdio.h>

#include <string.h>

#include <stdarg.h>

#include <winpr/crt.h>

#include <winpr/assert.h>

#include <winpr/print.h>

#include <winpr/sysinfo.h>

#include <winpr/environment.h>

#include "wlog.h"

#include "Layout.h"

#if defined __linux__ && !defined ANDROID

#include <unistd.h>

#include <sys/syscall.h>

#endif

#ifndef MIN

#define MIN(x, y) (((x) < (y)) ? (x) : (y))

#endif

struct format_option_recurse;

struct format_tid_arg

{

  char tid[32];

};

struct format_option

{

  const char* fmt;

  size_t fmtlen;

  const char* replace;

  size_t replacelen;

  const char* (*fkt)(void*);

  union

  {

    void* pv;

    const void* cpv;

    size_t s;

  } arg;

  const char* (*ext)(const struct format_option* opt, const char* str, size_t* preplacelen,

                     size_t* pskiplen);

  struct format_option_recurse* recurse;

};

struct format_option_recurse

{

  struct format_option* options;

  size_t nroptions;

  wLog* log;

  wLogLayout* layout;

  const wLogMessage* message;

  char buffer[WLOG_MAX_PREFIX_SIZE];

};

/**

 * Log Layout

 */

WINPR_ATTR_FORMAT_ARG(3, 0)

static void WLog_PrintMessagePrefixVA(char* prefix, size_t prefixlen,

                                      WINPR_FORMAT_ARG const char* format, va_list args)

{

  (void)vsnprintf(prefix, prefixlen, format, args);

}

WINPR_ATTR_FORMAT_ARG(3, 4)

static void WLog_PrintMessagePrefix(char* prefix, size_t prefixlen,

                                    WINPR_FORMAT_ARG const char* format, ...)

{

  va_list args;

  va_start(args, format);

  WLog_PrintMessagePrefixVA(prefix, prefixlen, format, args);

  va_end(args);

}

static const char* get_tid(void* arg)

{

  struct format_tid_arg* targ = arg;

  WINPR_ASSERT(targ);

  size_t tid = 0;

#if defined __linux__ && !defined ANDROID

  /* On Linux we prefer to see the LWP id */

  tid = (size_t)syscall(SYS_gettid);

#else

  tid = (size_t)GetCurrentThreadId();

#endif

  (void)_snprintf(targ->tid, sizeof(targ->tid), "%08" PRIxz, tid);

  return targ->tid;

}

static BOOL log_invalid_fmt(const char* what)

{

  (void)fprintf(stderr, "Invalid format string '%s'\n", what);

  return FALSE;

}

static BOOL check_and_log_format_size(char* format, size_t size, size_t index, size_t add)

{

  /* format string must be '\0' terminated, so abort at size - 1 */

  if (index + add + 1 >= size)

  {

    (void)fprintf(stderr,

                  "Format string too long ['%s', max %" PRIuz ", used %" PRIuz

                  ", adding %" PRIuz "]\n",

                  format, size, index, add);

    return FALSE;

  }

  return TRUE;

}

static int opt_compare_fn(const void* a, const void* b)

{

  const char* what = a;

  const struct format_option* opt = b;

  if (!opt)

    return -1;

  return strncmp(what, opt->fmt, opt->fmtlen);

}

static BOOL replace_format_string(const char* FormatString, struct format_option_recurse* recurse,

                                  char* format, size_t formatlen);

static const char* skip_if_null(const struct format_option* opt, const char* fmt,

                                size_t* preplacelen, size_t* pskiplen)

{

  WINPR_ASSERT(opt);

  WINPR_ASSERT(fmt);

  WINPR_ASSERT(preplacelen);

  WINPR_ASSERT(pskiplen);

  *preplacelen = 0;

  *pskiplen = 0;

  const char* str = &fmt[opt->fmtlen]; /* Skip first %{ from string */

  const char* end = strstr(str, opt->replace);

  if (!end)

    return NULL;

  *pskiplen = WINPR_ASSERTING_INT_CAST(size_t, end - fmt) + opt->replacelen;

  if (!opt->arg.cpv)

    return NULL;

  const size_t replacelen = WINPR_ASSERTING_INT_CAST(size_t, end - str);

  char buffer[WLOG_MAX_PREFIX_SIZE] = { 0 };

  memcpy(buffer, str, MIN(replacelen, ARRAYSIZE(buffer) - 1));

  if (!replace_format_string(buffer, opt->recurse, opt->recurse->buffer,

                             ARRAYSIZE(opt->recurse->buffer)))

    return NULL;

  *preplacelen = strnlen(opt->recurse->buffer, ARRAYSIZE(opt->recurse->buffer));

  return opt->recurse->buffer;

}

static BOOL replace_format_string(const char* FormatString, struct format_option_recurse* recurse,

                                  char* format, size_t formatlen)

{

  WINPR_ASSERT(FormatString);

  WINPR_ASSERT(recurse);

  size_t index = 0;

  while (*FormatString)

  {

    const struct format_option* opt =

        bsearch(FormatString, recurse->options, recurse->nroptions,

                sizeof(struct format_option), opt_compare_fn);

    if (opt)

    {

      size_t replacelen = opt->replacelen;

      size_t fmtlen = opt->fmtlen;

      const char* replace = opt->replace;

      const void* arg = opt->arg.cpv;

      if (opt->ext)

        replace = opt->ext(opt, FormatString, &replacelen, &fmtlen);

      if (opt->fkt)

        arg = opt->fkt(opt->arg.pv);

      if (replace && (replacelen > 0))

      {

        WINPR_PRAGMA_DIAG_PUSH

        WINPR_PRAGMA_DIAG_IGNORED_FORMAT_NONLITERAL

        const int rc = _snprintf(&format[index], formatlen - index, replace, arg);

        WINPR_PRAGMA_DIAG_POP

        if (rc < 0)

          return FALSE;

        if (!check_and_log_format_size(format, formatlen, index,

                                       WINPR_ASSERTING_INT_CAST(size_t, rc)))

          return FALSE;

        index += WINPR_ASSERTING_INT_CAST(size_t, rc);

      }

      FormatString += fmtlen;

    }

    else

    {

      /* Unknown format string */

      if (*FormatString == '%')

        return log_invalid_fmt(FormatString);

      if (!check_and_log_format_size(format, formatlen, index, 1))

        return FALSE;

      format[index++] = *FormatString++;

    }

  }

  if (!check_and_log_format_size(format, formatlen, index, 0))

    return FALSE;

  return TRUE;

}

BOOL WLog_Layout_GetMessagePrefix(wLog* log, wLogLayout* layout, const wLogMessage* message,

                                  char* prefix, size_t prefixlen)

{

  char format[WLOG_MAX_PREFIX_SIZE] = { 0 };

  WINPR_ASSERT(layout);

  WINPR_ASSERT(message);

  WINPR_ASSERT(prefix);

  struct format_tid_arg targ = { 0 };

  SYSTEMTIME localTime = { 0 };

  GetLocalTime(&localTime);

  struct format_option_recurse recurse = {

    .options = NULL, .nroptions = 0, .log = log, .layout = layout, .message = message

  };

#define ENTRY(x) x, sizeof(x) - 1

  struct format_option options[] = {

    { ENTRY("%ctx"),

      ENTRY("%s"),

      log->custom,

      { .pv = log->context },

      NULL,

      &recurse }, /* log context */

    { ENTRY("%dw"),

      ENTRY("%u"),

      NULL,

      { .s = localTime.wDayOfWeek },

      NULL,

      &recurse }, /* day of week */

    { ENTRY("%dy"), ENTRY("%u"), NULL, { .s = localTime.wDay }, NULL, &recurse }, /* day of year

                                                                                   */

    { ENTRY("%fl"), ENTRY("%s"), NULL, { .cpv = message->FileName }, NULL, &recurse }, /* file

                                                                                        */

    { ENTRY("%fn"),

      ENTRY("%s"),

      NULL,

      { .cpv = message->FunctionName },

      NULL,

      &recurse },                                                                    /* function

                                                                                      */

    { ENTRY("%hr"), ENTRY("%02u"), NULL, { .s = localTime.wHour }, NULL, &recurse }, /* hours */

    { ENTRY("%ln"),

      ENTRY("%" PRIuz),

      NULL,

      { .s = message->LineNumber },

      NULL,

      &recurse }, /* line number */

    { ENTRY("%lv"),

      ENTRY("%s"),

      NULL,

      { .cpv = WLOG_LEVELS[message->Level] },

      NULL,

      &recurse }, /* log level */

    { ENTRY("%mi"),

      ENTRY("%02u"),

      NULL,

      { .s = localTime.wMinute },

      NULL,

      &recurse }, /* minutes

                   */

    { ENTRY("%ml"),

      ENTRY("%03u"),

      NULL,

      { .s = localTime.wMilliseconds },

      NULL,

      &recurse }, /* milliseconds */

    { ENTRY("%mn"), ENTRY("%s"), NULL, { .cpv = log->Name }, NULL, &recurse }, /* module name */

    { ENTRY("%mo"), ENTRY("%u"), NULL, { .s = localTime.wMonth }, NULL, &recurse }, /* month */

    { ENTRY("%pid"),

      ENTRY("%u"),

      NULL,

      { .s = GetCurrentProcessId() },

      NULL,

      &recurse }, /* process id */

    { ENTRY("%se"),

      ENTRY("%02u"),

      NULL,

      { .s = localTime.wSecond },

      NULL,

      &recurse },                                                             /* seconds

                                                                               */

    { ENTRY("%tid"), ENTRY("%s"), get_tid, { .pv = &targ }, NULL, &recurse }, /* thread id */

    { ENTRY("%yr"), ENTRY("%u"), NULL, { .s = localTime.wYear }, NULL, &recurse }, /* year */

    { ENTRY("%{"),

      ENTRY("%}"),

      NULL,

      { .pv = log->context },

      skip_if_null,

      &recurse }, /* skip if no context */

  };

  recurse.options = options;

  recurse.nroptions = ARRAYSIZE(options);

  if (!replace_format_string(layout->FormatString, &recurse, format, ARRAYSIZE(format)))

    return FALSE;

  WINPR_PRAGMA_DIAG_PUSH

  WINPR_PRAGMA_DIAG_IGNORED_FORMAT_SECURITY

  WLog_PrintMessagePrefix(prefix, prefixlen, format);

  WINPR_PRAGMA_DIAG_POP

  return TRUE;

}

wLogLayout* WLog_GetLogLayout(wLog* log)

{

  wLogAppender* appender = NULL;

  appender = WLog_GetLogAppender(log);

  return appender->Layout;

}

BOOL WLog_Layout_SetPrefixFormat(WINPR_ATTR_UNUSED wLog* log, wLogLayout* layout,

                                 const char* format)

{

  free(layout->FormatString);

  layout->FormatString = NULL;

  if (format)

  {

    layout->FormatString = _strdup(format);

    if (!layout->FormatString)

      return FALSE;

  }

  return TRUE;

}

wLogLayout* WLog_Layout_New(WINPR_ATTR_UNUSED wLog* log)

{

  LPCSTR prefix = "WLOG_PREFIX";

  DWORD nSize = 0;

  char* env = NULL;

  wLogLayout* layout = NULL;

  layout = (wLogLayout*)calloc(1, sizeof(wLogLayout));

  if (!layout)

    return NULL;

  nSize = GetEnvironmentVariableA(prefix, NULL, 0);

  if (nSize)

  {

    env = (LPSTR)malloc(nSize);

    if (!env)

    {

      free(layout);

      return NULL;

    }

    if (GetEnvironmentVariableA(prefix, env, nSize) != nSize - 1)

    {

      free(env);

      free(layout);

      return NULL;

    }

  }

  if (env)

    layout->FormatString = env;

  else

  {

#ifdef ANDROID

    layout->FormatString = _strdup("[pid=%pid:tid=%tid] - [%fn]%{[%ctx]%}: ");

#else

    layout->FormatString =

        _strdup("[%hr:%mi:%se:%ml] [%pid:%tid] [%lv][%mn] - [%fn]%{[%ctx]%}: ");

#endif

    if (!layout->FormatString)

    {

      free(layout);

      return NULL;

    }

  }

  return layout;

}

void WLog_Layout_Free(WINPR_ATTR_UNUSED wLog* log, wLogLayout* layout)

{

  if (layout)

  {

    if (layout->FormatString)

    {

      free(layout->FormatString);

      layout->FormatString = NULL;

    }

    free(layout);

  }

}