/*
 *      Driver for USB Audio Device Class devices.
 *      Copyright (c) 2009-13 S.Zharski <imker@gmx.li>
 *      Distributed under the terms of the MIT license.
 *
 */


#include "Settings.h"

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

#include <driver_settings.h>
#include <lock.h>

#include "Driver.h"


uint32 gTraceMask = ERR;
bool gTruncateLogFile = false;
bool gAddTimeStamp = true;
static char* gLogFilePath = NULL;
mutex gLogLock;

static
void create_log()
{
        if (gLogFilePath == NULL)
                return;

        int flags = O_WRONLY | O_CREAT | ((gTruncateLogFile) ? O_TRUNC : 0);
        int fd = open(gLogFilePath, flags, 0666);
        if (fd >= 0)
                close(fd);

        mutex_init(&gLogLock, DRIVER_NAME"-logging");
}


void load_settings()
{
        void* handle = load_driver_settings(DRIVER_NAME);
        if (handle == 0)
                return;

        gTraceMask = strtoul(get_driver_parameter(handle, "trace", "1", "0"), 0, 0);
        gTruncateLogFile = get_driver_boolean_parameter(handle, "truncate_logfile",
                                                gTruncateLogFile, true);
        gAddTimeStamp = get_driver_boolean_parameter(handle, "add_timestamp",
                                                gAddTimeStamp, true);
        const char* logFilePath = get_driver_parameter(handle, "logfile",
                                                NULL, "/var/log/" DRIVER_NAME ".log");
        if (logFilePath != NULL)
                gLogFilePath = strdup(logFilePath);

        unload_driver_settings(handle);

        create_log();
}


void release_settings()
{
        if (gLogFilePath != NULL) {
                mutex_destroy(&gLogLock);
                free(gLogFilePath);
        }
}


void usb_audio_trace(uint32 bits, const char* func, const char* fmt, ...)
{
        if ((gTraceMask & bits) == 0)
                return;

        va_list arg_list;
        static const char* prefix = DRIVER_NAME":";
        static char buffer[1024];
        char* buf_ptr = buffer;
        if (gLogFilePath == NULL) {
                strlcpy(buffer, prefix, sizeof(buffer));
                buf_ptr += strlen(prefix);
        }

        if (gAddTimeStamp) {
                bigtime_t time = system_time();
                uint32 msec = time / 1000;
                uint32 sec = msec / 1000;
                sprintf(buf_ptr, "%02" B_PRIu32 ".%02" B_PRIu32 ".%03" B_PRIu32 ":",
                                sec / 60, sec % 60, msec % 1000);
                buf_ptr += strlen(buf_ptr);
        }

        if (func        != NULL) {
                sprintf(buf_ptr, "%s::", func);
                buf_ptr += strlen(buf_ptr);
        }

        va_start(arg_list, fmt);
        vsprintf(buf_ptr, fmt, arg_list);
        va_end(arg_list);

        if (gLogFilePath == NULL) {
                dprintf("%s", buffer);
                return;
        }

        mutex_lock(&gLogLock);
        int fd = open(gLogFilePath, O_WRONLY | O_APPEND);
        if (fd >= 0) {
                write(fd, buffer, strlen(buffer));
                close(fd);
        }
        mutex_unlock(&gLogLock);
}