// Copyright 2013 Google Inc. All Rights Reserved.
//
// Log - implemented using stdout.

#include "log.h"

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

namespace {

FILE* const kOutputFile = stdout;

}  // namespace

namespace wvutil {

LogPriority g_cutoff = CDM_LOG_WARN;

void InitLogging() {
  // Note: The default log level is CDM_LOG_WARN, above.  If you set the
  // environment variable VERBOSE_LOG, you will get verbose logging.  This is
  // set by jenkins (http://go/wvbuild), so that we have more details when the
  // build breaks.
  const char* verbose_env = getenv("VERBOSE_LOG");
  if (verbose_env && strncmp(verbose_env, "yes", 3) == 0) {
    g_cutoff = CDM_LOG_VERBOSE;
  }
}

void Log(const char* file, const char* function, int line, LogPriority level,
         const char* fmt, ...) {
  const char* severities[] = {"ERROR", "WARN", "INFO", "DEBUG", "VERBOSE"};
  if (level < 0 || static_cast<size_t>(level) >=
                       sizeof(severities) / sizeof(severities[0])) {
    fprintf(kOutputFile, "[FATAL:%s(%d):%s] Invalid log priority level: %d\n",
            file, line, function, level);
    return;
  }
  if (level > g_cutoff) return;

  // Strip off the leading "../" that clutters the logs.
  const char* up_dir = "../";
  const size_t up_dir_size = strlen(up_dir);
  while (strncmp(up_dir, file, up_dir_size) == 0) file += up_dir_size;

  fprintf(kOutputFile, "[%s:%s(%d):%s] ", severities[level], file, line,
          function);

  va_list ap;
  va_start(ap, fmt);
  vfprintf(kOutputFile, fmt, ap);
  va_end(ap);

  putc('\n', kOutputFile);
  fflush(kOutputFile);
}

}  // namespace wvutil