/*-
 * Copyright (c) 2015 Carsten Larsen
 * Copyright (c) 2014 Poul-Henning Kamp
 * 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 SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR CONTRIBUTORS 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.
 *
 * Operational Context STDIO
 * =========================
 *
 *	"The most effective debugging tool is still careful thought,
 *	 coupled with judiciously placed print statements."
 *		-- Brian Kernighan, "Unix for Beginners" (1979)
 *
 * The problem with print statements is where they end up.  For instance
 * in a server with a CLI interface, you want the print statements to go
 * to the CLI session which called the code.
 *
 * An "Operational Context" is a back-pointer to where the print statement
 * should end up.
 *
 * We operate with three "channels", DIAG, TRACE and DEBUG.
 *
 * DIAG is mandatory output, error messages, diagnostics etc.
 *	This should always end up where the action was initiated.
 *
 * DEBUG is optional output which may be supressed.
 *	This should go where DIAG goes, unless specifically redirected
 *	by the operator.
 *
 * TRACE is data collection, statistics etc.
 *	In general this goes nowhere unless configured to end up
 *	somewhere.
 *
 * About this implementation:
 *
 * This is a very naive implementation spitting things out to stdout/stderr,
 * knowing that we are a single threaded program.
 *
 * XXX: Pull in sbufs to do it right.
 */

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

#include "ntimed_platform.h"
#include "ntimed.h"

#ifdef AOS3
# include "clib/timezone_protos.h"
# include "inline/timezone.h"
#endif
#ifdef AROS
# include <time.h>
#endif

int repeat_trace = 0;

static FILE *debugfile = NULL;
static FILE *tracefile = NULL;

static FILE *
getdst(enum ocx_chan chan)
{
    if (chan == OCX_DIAG)
        return (stderr);
    if (chan == OCX_TRACE)
        return (tracefile);
    if (chan == OCX_DEBUG)
        return (debugfile);
    WRONG("Wrong ocx_chan");
    NEEDLESS_RETURN(NULL);
}

/**********************************************************************
 * XXX: take strftime format string to chop tracefiles in time.
 */

void
ArgTracefile(const char *fn)
{
    if (tracefile != NULL && tracefile != stdout) {
        AZ(fclose(tracefile));
        tracefile = NULL;
    }

    if (fn == NULL)
        return;

    tracefile = fopen(fn, "w");
    if (tracefile == NULL)
        Fail(NULL, 1, "Could not open '%s' for writing", fn);
}

void
EnableDebug()
{
    debugfile = stdout;
}

void
EnableTraceDebug()
{
    repeat_trace = 1;
}

/**********************************************************************
 * XXX: The stuff below is generic and really ought to be in ocx.c on
 * XXX: its own.
 */

void
Put(struct ocx *ocx, enum ocx_chan chan, const char *fmt, ...)
{
    FILE *dst;
    va_list ap;

    AZ(ocx);
    va_start(ap, fmt);

    dst = getdst(chan);
    if (dst != NULL) {
        (void)vfprintf(dst, fmt, ap);
        fflush(dst);
    }

    // Repeat trace in debug channel
    if (chan == OCX_TRACE && repeat_trace) {
        dst = getdst(OCX_DEBUG);
        if (dst != NULL) {
            (void)vfprintf(dst, fmt, ap);
            fflush(dst);
        }
    }

    va_end(ap);
}

void
PutHex(struct ocx *ocx, enum ocx_chan chan, const void *ptr, ssize_t len)
{
    const uint8_t *p = ptr;
    const char *s = "";

    AN(ptr);
    assert(len >= 0);

    while(len--) {
        Put(ocx, chan, "%s%x", s, *p++);
        s = " ";
    }
}

void
PutTime(struct ocx *ocx, enum ocx_chan chan, const char *fmt, const struct timestamp *ts)
{
#ifdef AMIGA
    FILE *dst;
    struct tm tm;
    static char buf[80];

    if (TimezoneBase) {
        const time_t t = (uint32_t)ts->sec;
        localtime_r((const time_t*)&t, &tm);
        strftime(buf, 80, "%+", &tm);

        dst = getdst(chan);
        if (dst != NULL && dst == stdout) {
            (void)fprintf(dst, fmt, buf);
            fflush(dst);
        }
    }
#endif
}

void
Fail(struct ocx *ocx, int err, const char *fmt, ...)
{
    FILE *dst;
    va_list ap;

    if (err)
        err = errno;
    Put(ocx, OCX_DIAG, "Failure: ");

    va_start(ap, fmt);
    dst = getdst(OCX_DIAG);
    if (dst != NULL) {
        (void)vfprintf(dst, fmt, ap);
        fflush(dst);
    }
    va_end(ap);

    Put(ocx, OCX_DIAG, "\n");
    if (err)
        Put(ocx, OCX_DIAG, "errno = %d (%s)\n", err, strerror(err));

    exit(1);
}