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#include "log.h"

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#include <stdio.h>

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#include <stdarg.h>

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#include <string.h>

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#include <stdlib.h>

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#include <errno.h>

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/**

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 * The global log level

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 */

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static enum log_level _log_level = LOG_LEVEL_DEFAULT;

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/**

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 * List of log level names

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 */

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const char *log_level_names[] = {

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    "DEBUG",

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    "INFO",

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    "WARN",

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    "ERROR",

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    "FATAL",

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    NULL

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};

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#define _LOG_LEVEL_NAME(ll) case LOG_ ## ll: return #ll;

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const char *log_level_name (enum log_level level)

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{

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    switch (level) {

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        _LOG_LEVEL_NAME(DEBUG)

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        _LOG_LEVEL_NAME(INFO)

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        _LOG_LEVEL_NAME(WARN)

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        _LOG_LEVEL_NAME(ERROR)

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        _LOG_LEVEL_NAME(FATAL)

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        default: return "???";

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    }

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}

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#undef _LOG_LEVEL_NAME

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void set_log_level (enum log_level level)

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{

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    // meep meep

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    _log_level = level;

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}

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size_t str_append_fmt_va (char *buf_ptr, size_t *buf_size, const char *fmt, va_list args)

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{

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    int ret;

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    if (*buf_size && (ret = vsnprintf(buf_ptr, *buf_size, fmt, args)) < 0)

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        return 0;

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    if (ret > *buf_size)

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        *buf_size = 0;

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    else

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        *buf_size -= ret;

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    return ret;

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}

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size_t str_append_fmt (char *buf_ptr, size_t *buf_size, const char *fmt, ...)

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{

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    va_list vargs;

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    size_t ret;

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    va_start(vargs, fmt);

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    ret = str_append_fmt_va(buf_ptr, buf_size, fmt, vargs);

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    va_end(vargs);

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    return ret;

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}

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void log_output_tag_va (enum log_level level, const char *tag, const char *func, const char *user_fmt, va_list user_fmtargs, const char *log_fmt, va_list log_fmtargs)

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{

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    char buf[LOG_MSG_MAX], *buf_ptr = buf;

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    size_t buf_size = sizeof(buf);

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    // filter out?

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    if (level < _log_level)

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        return;

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    buf_ptr += str_append_fmt(buf_ptr, &buf_size, "[%5s] %20s : ", tag, func);

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    // output the user data

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    if (user_fmt)

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        buf_ptr += str_append_fmt_va(buf_ptr, &buf_size, user_fmt, user_fmtargs);

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    // output the suffix

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    if (log_fmt)

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        buf_ptr += str_append_fmt_va(buf_ptr, &buf_size, log_fmt, log_fmtargs);

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    // display

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    // XXX: handle SIGINTR?

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    fprintf(stderr, "%s\n", buf);

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}

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void log_output_tag (enum log_level level, const char *tag, const char *func, const char *user_fmt, va_list user_fmtargs, const char *log_fmt, ...)

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{

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    va_list vargs;

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    va_start(vargs, log_fmt);

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    log_output_tag_va(level, tag, func, user_fmt, user_fmtargs, log_fmt, vargs);

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    va_end(vargs);

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}

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void _log_msg (enum log_level level, const char *func, const char *format, ...)

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{

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    va_list vargs;

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    // formatted output: no suffix

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    va_start(vargs, format);

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    log_output_tag(level, log_level_name(level), func, format, vargs, NULL);

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    va_end(vargs);

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}

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void _log_msg_va2 (enum log_level level, const char *func, const char *fmt1, va_list fmtargs1, const char *fmt2, va_list fmtargs2)

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{

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    log_output_tag_va(level, log_level_name(level), func, fmt1, fmtargs1, fmt2, fmtargs2);

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}

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void _log_errno (enum log_level level, const char *func, const char *format, ...)

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{

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    va_list vargs;

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    // formatted output: suffix strerror()

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    va_start(vargs, format);

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    log_output_tag(level, log_level_name(level), func, format, vargs, ": %s", strerror(errno));

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    va_end(vargs);

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}

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void _log_exit (enum log_level level, int exit_code, const char *func, const char *format, ...)

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{

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    va_list vargs;

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    // formatted output without any suffix

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    va_start(vargs, format);

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    log_output_tag(level, "EXIT", func, format, vargs, NULL);

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    va_end(vargs);

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    // exit

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    exit(exit_code);

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}

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