/*
 * Copyright 2017-2018 Leonid Yuriev <leo@yuriev.ru>
 * and other libmdbx authors: please see AUTHORS file.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "test.h"

static void fflushall() { fflush(nullptr); }

void failure(const char *fmt, ...) {
  va_list ap;
  va_start(ap, fmt);
  fflushall();
  logging::output(logging::failure, fmt, ap);
  va_end(ap);
  fflushall();
  exit(EXIT_FAILURE);
}

const char *test_strerror(int errnum) {
  static __thread char buf[1024];
  return mdbx_strerror_r(errnum, buf, sizeof(buf));
}

void __noreturn failure_perror(const char *what, int errnum) {
  failure("%s failed: %s (%d)\n", what, test_strerror(errnum), errnum);
}

//-----------------------------------------------------------------------------

static void mdbx_logger(int type, const char *function, int line,
                        const char *msg, va_list args) {
  logging::loglevel level = logging::info;
  if (type & MDBX_DBG_EXTRA)
    level = logging::extra;
  if (type & MDBX_DBG_TRACE)
    level = logging::trace;
  if (type & MDBX_DBG_PRINT)
    level = logging::verbose;

  if (!function)
    function = "unknown";
  if (type & MDBX_DBG_ASSERT) {
    log_error("mdbx: assertion failure: %s, %d", function, line);
    level = logging::failure;
  }

  if (logging::output(
          level,
          strncmp(function, "mdbx_", 5) == 0 ? "%s: " : "mdbx: %s: ", function))
    logging::feed_ap(msg, args);
  if (type & MDBX_DBG_ASSERT)
    abort();
}

namespace logging {

static std::string prefix;
static std::string suffix;
static loglevel level;
static FILE *last;

void setlevel(loglevel _level) {
  level = (_level > error) ? failure : _level;
  int mdbx_dbg_opts = MDBX_DBG_ASSERT | MDBX_DBG_JITTER | MDBX_DBG_DUMP;
  if (level <= trace)
    mdbx_dbg_opts |= MDBX_DBG_TRACE;
  if (level <= verbose)
    mdbx_dbg_opts |= MDBX_DBG_PRINT;
  int rc = mdbx_setup_debug(mdbx_dbg_opts, mdbx_logger);
  log_trace("set mdbx debug-opts: 0x%02x", rc);
}

void setup(loglevel _level, const std::string &_prefix) {
  setlevel(_level);
  prefix = _prefix;
}

void setup(const std::string &_prefix) { prefix = _prefix; }

const char *level2str(const loglevel alevel) {
  switch (alevel) {
  default:
    return "invalid/unknown";
  case extra:
    return "extra";
  case trace:
    return "trace";
  case verbose:
    return "verbose";
  case info:
    return "info";
  case notice:
    return "notice";
  case warning:
    return "warning";
  case error:
    return "error";
  case failure:
    return "failure";
  }
}

bool output(const loglevel priority, const char *format, ...) {
  if (priority < level)
    return false;

  va_list ap;
  va_start(ap, format);
  output(priority, format, ap);
  va_end(ap);
  return true;
}

bool output(const logging::loglevel priority, const char *format, va_list ap) {
  if (last) {
    putc('\n', last);
    fflush(last);
    last = nullptr;
  }

  if (priority < level)
    return false;

  chrono::time now = chrono::now_realtime();
  struct tm tm;
#ifdef _MSC_VER
  int rc = _localtime32_s(&tm, (const __time32_t *)&now.utc);
#else
  time_t time = now.utc;
  int rc = localtime_r(&time, &tm) ? MDBX_SUCCESS : errno;
#endif
  if (rc != MDBX_SUCCESS)
    failure_perror("localtime_r()", rc);

  last = stdout;
  fprintf(last,
          "[ %02d%02d%02d-%02d:%02d:%02d.%06d_%05u %-10s %.4s ] %s" /* TODO */,
          tm.tm_year - 100, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min,
          tm.tm_sec, chrono::fractional2us(now.fractional), osal_getpid(),
          prefix.c_str(), level2str(priority), suffix.c_str());

  va_list ones;
  memset(&ones, 0, sizeof(ones)) /* zap MSVC and other stupid compilers */;
  if (priority >= error)
    va_copy(ones, ap);
  vfprintf(last, format, ap);

  size_t len = strlen(format);
  char end = len ? format[len - 1] : '\0';

  switch (end) {
  default:
    putc('\n', last);
  // fall through
  case '\n':
    fflush(last);
    last = nullptr;
  // fall through
  case ' ':
  case '_':
  case ':':
  case '|':
  case ',':
  case '\t':
  case '\b':
  case '\r':
  case '\0':
    break;
  }

  if (priority >= error) {
    if (last != stderr) {
      fprintf(stderr, "[ %05u %-10s %.4s ] %s", osal_getpid(), prefix.c_str(),
              level2str(priority), suffix.c_str());
      vfprintf(stderr, format, ones);
      if (end != '\n')
        putc('\n', stderr);
      fflush(stderr);
    }
    va_end(ones);
  }

  return true;
}

bool feed_ap(const char *format, va_list ap) {
  if (!last)
    return false;

  vfprintf(last, format, ap);
  size_t len = strlen(format);
  if (len && format[len - 1] == '\n') {
    fflush(last);
    last = nullptr;
  }
  return true;
}

bool feed(const char *format, ...) {
  if (!last)
    return false;

  va_list ap;
  va_start(ap, format);
  feed_ap(format, ap);
  va_end(ap);
  return true;
}

local_suffix::local_suffix(const char *c_str)
    : trim_pos(suffix.size()), indent(0) {
  suffix.append(c_str);
}

local_suffix::local_suffix(const std::string &str)
    : trim_pos(suffix.size()), indent(0) {
  suffix.append(str);
}

void local_suffix::push() {
  indent += 1;
  suffix.push_back('\t');
}

void local_suffix::pop() {
  assert(indent > 0);
  if (indent > 0) {
    indent -= 1;
    suffix.pop_back();
  }
}

local_suffix::~local_suffix() { suffix.erase(trim_pos); }

} // namespace logging

void log_extra(const char *msg, ...) {
  if (logging::extra >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::extra, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_trace(const char *msg, ...) {
  if (logging::trace >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::trace, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_verbose(const char *msg, ...) {
  if (logging::verbose >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::verbose, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_info(const char *msg, ...) {
  if (logging::info >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::info, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_notice(const char *msg, ...) {
  if (logging::notice >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::notice, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_warning(const char *msg, ...) {
  if (logging::warning >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::warning, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_error(const char *msg, ...) {
  if (logging::error >= logging::level) {
    va_list ap;
    va_start(ap, msg);
    logging::output(logging::error, msg, ap);
    va_end(ap);
  } else
    logging::last = nullptr;
}

void log_trouble(const char *where, const char *what, int errnum) {
  log_error("%s: %s %s", where, what, test_strerror(errnum));
}

bool log_enabled(const logging::loglevel priority) {
  return (priority >= logging::level);
}

void log_flush(void) { fflushall(); }