/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 1999-2004 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * This work was supported in part by funding from the Defense Advanced
 * Research Projects Agency and the National Science Foundation of the
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 *
 */
/**
 * @file err.c
 * @brief Somewhat antiquated logging and error interface.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include <pocketsphinx.h>

#include "util/filename.h"
#include "util/ckd_alloc.h"

static FILE*  logfp = NULL;
static int    logfp_disabled = FALSE;

#if defined(__ANDROID__)
#include <android/log.h>
static void
err_logcat_cb(void* user_data, err_lvl_t level, const char *fmt, ...);
#elif defined(_WIN32_WCE)
#include <windows.h>
#define vsnprintf _vsnprintf
static void
err_wince_cb(void* user_data, err_lvl_t level, const char *fmt, ...);
#endif

#if defined(__ANDROID__)
static err_cb_f err_cb = err_logcat_cb;
#elif defined(_WIN32_WCE)
static err_cb_f err_cb = err_wince_cb;
#else
static err_cb_f err_cb = err_logfp_cb;
#endif
static void* err_user_data;
static err_lvl_t min_loglevel = ERR_WARN;
static const char *err_level[ERR_MAX] =
    {
     "DEBUG", "INFO", "WARN", "ERROR", "FATAL"
    };

int
err_set_loglevel(err_lvl_t lvl)
{
    int rv = min_loglevel;
    min_loglevel = lvl;
    return rv;
}

const char *
err_set_loglevel_str(char const *lvl)
{
    const char *rv = err_level[min_loglevel];
    int i;

    if (lvl == NULL)
        return NULL;
    if (!strncmp(lvl, "ERR_", 4))
        lvl += 4;
    for (i = 0; i < ERR_MAX; ++i) {
        if (!strcmp(lvl, err_level[i])) {
            min_loglevel = i;
            return rv;
        }
    }
    return NULL;
}

void
err_msg(err_lvl_t lvl, const char *path, long ln, const char *fmt, ...)
{

    char msg[1024];
    va_list ap;

    if (!err_cb)
        return;
    if (lvl < min_loglevel)
        return;

    va_start(ap, fmt);
    vsnprintf(msg, sizeof(msg), fmt, ap);
    va_end(ap);

    if (path) {
        const char *fname = path2basename(path);
        if (lvl == ERR_INFO)
            err_cb(err_user_data, lvl, "%s: %s(%ld): %s", err_level[lvl], fname, ln, msg);
        else
    	    err_cb(err_user_data, lvl, "%s: \"%s\", line %ld: %s", err_level[lvl], fname, ln, msg);
    } else {
        err_cb(err_user_data, lvl, "%s", msg);
    }
}

#ifdef _WIN32_WCE /* No strerror for WinCE, so a separate implementation */
void
err_msg_system(err_lvl_t lvl, const char *path, long ln, const char *fmt, ...)
{
    va_list ap;
    LPVOID error_wstring;
    DWORD error;
    char msg[1024];
    char error_string[1024];

    if (!err_cb)
        return;
    if (lvl < min_loglevel)
        return;

    error = GetLastError();
    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 
                  FORMAT_MESSAGE_FROM_SYSTEM | 
                  FORMAT_MESSAGE_IGNORE_INSERTS,
                  NULL,
                  error,
                  0, // Default language
                  (LPTSTR) &error_wstring,
                  0,
                  NULL);
    wcstombs(error_string, error_wstring, 1023);
    LocalFree(error_wstring);

    va_start(ap, fmt);
    vsnprintf(msg, sizeof(msg), fmt, ap);
    va_end(ap);

    if (path) {
        const char *fname = path2basename(path);
        if (lvl == ERR_INFO)
            err_cb(err_user_data, lvl, "%s: %s(%ld): %s: %s\n", err_prefix[lvl], fname, ln, msg, error_string);
        else
    	    err_cb(err_user_data, lvl, "%s: \"%s\", line %ld: %s: %s\n", err_prefix[lvl], fname, ln, msg, error_string);
    } else {
        err_cb(err_user_data, lvl, "%s: %s\n", msg, error_string);
    }
}
#else
void
err_msg_system(err_lvl_t lvl, const char *path, long ln, const char *fmt, ...)
{
    int local_errno = errno;
    
    char msg[1024];
    va_list ap;

    if (!err_cb)
        return;
    if (lvl < min_loglevel)
        return;

    va_start(ap, fmt);
    vsnprintf(msg, sizeof(msg), fmt, ap);
    va_end(ap);

    if (path) {
        const char *fname = path2basename(path);
        if (lvl == ERR_INFO)
            err_cb(err_user_data, lvl, "%s: %s(%ld): %s: %s\n", err_level[lvl], fname, ln, msg, strerror(local_errno));
        else
    	    err_cb(err_user_data, lvl, "%s: \"%s\", line %ld: %s: %s\n", err_level[lvl], fname, ln, msg, strerror(local_errno));
    } else {
        err_cb(err_user_data, lvl, "%s: %s\n", msg, strerror(local_errno));
    }
}
#endif

#if defined(__ANDROID__)
static void
err_logcat_cb(void *user_data, err_lvl_t lvl, const char *fmt, ...)
{
    static const int android_level[ERR_MAX] = {ANDROID_LOG_DEBUG, ANDROID_LOG_INFO,
         ANDROID_LOG_INFO, ANDROID_LOG_WARN, ANDROID_LOG_ERROR, ANDROID_LOG_ERROR};

    va_list ap;
    va_start(ap, fmt);
    __android_log_vprint(android_level[lvl], "cmusphinx", fmt, ap);
    va_end(ap);
}
#elif defined(_WIN32_WCE)
static void
err_wince_cb(void *user_data, err_lvl_t lvl, const char *fmt, ...)
{
    char msg[1024];
    WCHAR *wmsg;
    size_t size;
    va_list ap;

    va_start(ap, fmt);
    _vsnprintf(msg, sizeof(msg), fmt, ap);
    va_end(ap);

    size = mbstowcs(NULL, msg, 0) + 1;
    wmsg = ckd_calloc(size, sizeof(*wmsg));
    mbstowcs(wmsg, msg, size);

    OutputDebugStringW(wmsg);
    ckd_free(wmsg);
}
#else
void
err_logfp_cb(void *user_data, err_lvl_t lvl, const char *fmt, ...)
{
    va_list ap;
    FILE *fp = err_get_logfp();

    (void)user_data;
    (void)lvl; /* FIXME?!?! */
    
    if (!fp)
        return;
    
    va_start(ap, fmt);
    vfprintf(fp, fmt, ap);
    va_end(ap);
    fflush(fp);
}
#endif

int
err_set_logfile(const char *path)
{
    FILE *newfp;

    if ((newfp = fopen(path, "a")) == NULL)
        return -1;
    err_set_logfp(newfp);
    return 0;
}

void
err_set_logfp(FILE *stream)
{
    if (logfp != NULL && logfp != stdout && logfp != stderr)
        fclose(logfp);
    if (stream == NULL) {
	logfp_disabled = TRUE;
	logfp = NULL;
	return;
    }    
    logfp_disabled = FALSE;
    logfp = stream;
    return;
}

FILE *
err_get_logfp(void)
{
    if (logfp_disabled)
	return NULL;
    if (logfp == NULL)
	return stderr;

    return logfp;
}

void
err_set_callback(err_cb_f cb, void* user_data)
{
    err_cb = cb;
    err_user_data= user_data;
}