/*-
 * Copyright (c) 2017-2021 Carsten Sonne Larsen <cs@innolan.net>
 * 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 ``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 THE AUTHOR 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.
 *
 */

#include <stddef.h>
#include <stdarg.h>
#include <stdbool.h>

#include <proto/dos.h>
#include <proto/exec.h>
#include <proto/intuition.h>
#include <exec/ports.h>
#include <exec/memory.h>

#include "message.h"
#include "global.h"
#include "string.h"

#ifndef INTUITIONNAME
#define INTUITIONNAME "intuition.library"
#endif
#ifndef UTILITYNAME
#define UTILITYNAME "utility.library"
#endif

#define TIMELOGGER "TimeLogger 1.12 (31.01.2021)"
#define ARGSFORMAT "D=DEBUG/K/N,M=MODULEOFF/S,S=SEVERITYOFF/S,H=HELP/S"
#define MODULENAME "Logger"

struct progargs
{
    LONG level;
    LONG module;
    LONG severity;
    LONG help;
};

static void LogMessage(enum LogSeverity, struct timeval *, const char *, const char *);
static void MsgLoop(void);
static void ShowHelp(void);

struct IntuitionBase *IntuitionBase = NULL;
struct UtilityBase *UtilityBase = NULL;
static struct MsgPort *LoggerPort = NULL;
static struct RDArgs *rdargs = NULL;
static struct progargs args = {0, 0, 0, 0};
static long SeverityLevel;
static char LogTemplate[50];

const char *vers = "\0$VER: " TIMELOGGER;

static void Listen(void)
{
    LogMessage(InfoMessage, NULL, MODULENAME, "Starting " TIMELOGGER);

    LoggerPort->mp_Node.ln_Name = LOGGER_PORT_NAME;
    LoggerPort->mp_Node.ln_Pri = 0;

    AddPort(LoggerPort);
    MsgLoop();
    RemPort(LoggerPort);
}

static void ProcessArgs(void)
{
    if (args.level != 0)
        SeverityLevel = *((LONG *)args.level);
    else
        SeverityLevel = 15;

    char *p = LogTemplate;
    p = AppendText(p, "%02ld:%02ld:%02ld.%03ld ");

    if (!args.module)
        p = AppendText(p, "[%-8s]");
    else
        p = AppendText(p, "%s");

    if (!args.severity)
        p = AppendText(p, "[%-5s]");
    else
        p = AppendText(p, "%s");

    if (!(args.severity && args.module))
        p = AppendChar(p, ' ', 1);

    AppendText(p, "%s");
}

bool Init(void)
{
    rdargs = ReadArgs((STRPTR)ARGSFORMAT, (APTR)&args, NULL);
    if (!rdargs)
        return false;

    LoggerPort = CreateMsgPort();
    if (LoggerPort == NULL)
        return false;

    if (!(UtilityBase = (struct UtilityBase *)OpenLibrary((STRPTR)UTILITYNAME, 0)))
        return false;

    if (!(IntuitionBase = (struct IntuitionBase *)OpenLibrary((STRPTR)INTUITIONNAME, 0)))
        return false;

    return true;
}

void Cleanup(void)
{
    if (LoggerPort != NULL)
        DeleteMsgPort(LoggerPort);

    if (rdargs != NULL)
        FreeArgs(rdargs);

    if (IntuitionBase != NULL)
        CloseLibrary((struct Library *)IntuitionBase);

    if (UtilityBase != NULL)
        CloseLibrary((struct Library *)UtilityBase);
}

int main(int argc, char **argv)
{
    if (!Init())
    {
        Cleanup();
        return RETURN_FAIL;
    }

    if (args.help)
    {
        ShowHelp();
    }
    else
    {
        ProcessArgs();
        Listen();
    }

    Cleanup();
    return RETURN_OK;
}

static const char *SeverityText(enum LogSeverity level)
{
    switch (level)
    {
    case ErrorMessage:
        return "Error";
    case WarningMessage:
        return "Warn";
    case NoticeMessage:
        return "Notice";
    case InfoMessage:
        return "Info";
    case DebugMessage:
        return "Debug";
    case TraceMessage:
    case MemTraceMessage:
        return "Trace";
    default:
        return "Unspec";
    }
}

static void LogMessage(enum LogSeverity level, struct timeval *tv, const char *module, const char *log)
{
    if (SeverityLevel >= (long)level)
    {
        ULONG secs;
        ULONG micro;
        if (tv == NULL)
        {
            CurrentTime(&secs, &micro);
        }
        else
        {
            secs = tv->tv_secs;
            micro = tv->tv_micro;
        }

        micro /= 1000;

        struct ClockData cd;
        Amiga2Date(secs, &cd);

        char line[MAXLOGLINESIZE + 32];
        const char *severity = SeverityText(level);
        SNPrintf(line, MAXLOGLINESIZE + 32, LogTemplate,
                 (long)cd.hour,
                 (long)cd.min,
                 (long)cd.sec,
                 (long)micro,
                 (args.module ? "" : module),
                 (args.severity ? "" : severity),
                 log);
        TrimRight(line);

        // TODO: Option to log using a file
        // TODO: Handle outout errors
        if (Output() != (BPTR)0)
        {
            Printf((STRPTR)line);
            Printf((STRPTR) "\n");
        }
    }
}

static void MsgLoop(void)
{
    bool loop = true;
    ULONG loggerSigMask = (1 << LoggerPort->mp_SigBit);
    ULONG sigMask = loggerSigMask | SIGBREAKF_CTRL_C;

    LogMessage(NoticeMessage, NULL, MODULENAME, "Waiting for log messages ...");

    do
    {
        ULONG sigrcvd = Wait(sigMask);
        if (sigrcvd & sigMask)
        {
            struct LogMessage *msg;
            while ((msg = (struct LogMessage *)GetMsg(LoggerPort)))
            {
                struct timeval tv;
                struct LogMessage copy;
                CurrentTime(&tv.tv_secs, &tv.tv_micro);
                CopyMem(msg, &copy, sizeof(struct LogMessage));
                ReplyMsg((struct Message *)msg);
                LogMessage(copy.Severity, &tv, copy.Module, copy.Text);
            }
        }

        if (sigrcvd & SIGBREAKF_CTRL_C)
        {
            LogMessage(WarningMessage, NULL, MODULENAME, "Shutting down");
            loop = false;
        }
    } while (loop);
}

static void ShowHelp(void)
{
    Printf((STRPTR)TIMELOGGER "\n");
    Printf((STRPTR) "Shows log messages from " APP_SHORT_NAME ".\n");
    Printf((STRPTR) "Use arguments to control output.\n");
    Printf((STRPTR) "Debug level (D or DEBUG):\n");
    Printf((STRPTR) "   5 = Error conditions\n");
    Printf((STRPTR) "  10 = Warning conditions\n");
    Printf((STRPTR) "  15 = Normal but significant conditions\n");
    Printf((STRPTR) "  20 = Informational messages\n");
    Printf((STRPTR) "  30 = Debug-level messages\n");
    Printf((STRPTR) "  40 = Trace program flow\n");
    Printf((STRPTR) "  90 = Trace memory exceptions\n");
    Printf((STRPTR) "MODULEOFF: Hide module name\n");
    Printf((STRPTR) "SEVERITYOFF: Hide severity level\n");
    Printf((STRPTR) "HELP: Show help text\n");
}