/******************************************************************************

 * Project:  PROJ.4

 * Purpose:  Implementation of pj_log() function.

 * Author:   Frank Warmerdam, warmerdam@pobox.com

 *

 ******************************************************************************

 * Copyright (c) 2010, Frank Warmerdam

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 *****************************************************************************/

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "proj.h"

#include "proj_internal.h"

/************************************************************************/

/*                          pj_stderr_logger()                          */

/************************************************************************/

void pj_stderr_logger(void *app_data, int level, const char *msg)

{

    (void)app_data;

    (void)level;

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

}

/************************************************************************/

/*                           pj_log_active()                            */

/************************************************************************/

bool pj_log_active(PJ_CONTEXT *ctx, int level) {

    int debug_level = ctx->debug_level;

    int shutup_unless_errno_set = debug_level < 0;

    /* For negative debug levels, we first start logging when errno is set */

    if (ctx->last_errno == 0 && shutup_unless_errno_set)

        return false;

    if (debug_level < 0)

        debug_level = -debug_level;

    if (level > debug_level)

        return false;

    return true;

}

/************************************************************************/

/*                               pj_vlog()                              */

/************************************************************************/

static void pj_vlog(PJ_CONTEXT *ctx, int level, const PJ *P, const char *fmt,

                    va_list args)

{

    char *msg_buf;

    if (!pj_log_active(ctx, level))

        return;

    constexpr size_t BUF_SIZE = 100000;

    msg_buf = (char *)malloc(BUF_SIZE);

    if (msg_buf == nullptr)

        return;

    if (P == nullptr || P->short_name == nullptr)

        vsnprintf(msg_buf, BUF_SIZE, fmt, args);

    else {

        std::string fmt_with_P_short_name(P->short_name);

        fmt_with_P_short_name += ": ";

        fmt_with_P_short_name += fmt;

        vsnprintf(msg_buf, BUF_SIZE, fmt_with_P_short_name.c_str(), args);

    }

    msg_buf[BUF_SIZE - 1] = '\0';

    ctx->logger(ctx->logger_app_data, level, msg_buf);

    free(msg_buf);

}

/************************************************************************/

/*                               pj_log()                               */

/************************************************************************/

void pj_log(PJ_CONTEXT *ctx, int level, const char *fmt, ...)

{

    va_list args;

    if (level > ctx->debug_level)

        return;

    va_start(args, fmt);

    pj_vlog(ctx, level, nullptr, fmt, args);

    va_end(args);

}

/***************************************************************************************/

PJ_LOG_LEVEL proj_log_level(PJ_CONTEXT *ctx, PJ_LOG_LEVEL log_level) {

    /****************************************************************************************

       Set logging level 0-3. Higher number means more debug info. 0 turns it

    off

    ****************************************************************************************/

    PJ_LOG_LEVEL previous;

    if (nullptr == ctx)

        ctx = pj_get_default_ctx();

    if (nullptr == ctx)

        return PJ_LOG_TELL;

    previous = static_cast<PJ_LOG_LEVEL>(abs(ctx->debug_level));

    if (PJ_LOG_TELL == log_level)

        return previous;

    ctx->debug_level = log_level;

    return previous;

}

/*****************************************************************************/

void proj_log_error(const PJ *P, const char *fmt, ...) {

    /******************************************************************************

       For reporting the most severe events.

    ******************************************************************************/

    va_list args;

    va_start(args, fmt);

    pj_vlog(pj_get_ctx((PJ *)P), PJ_LOG_ERROR, P, fmt, args);

    va_end(args);

}

/*****************************************************************************/

void proj_log_debug(PJ *P, const char *fmt, ...) {

    /******************************************************************************

       For reporting debugging information.

    ******************************************************************************/

    va_list args;

    va_start(args, fmt);

    pj_vlog(pj_get_ctx(P), PJ_LOG_DEBUG, P, fmt, args);

    va_end(args);

}

/*****************************************************************************/

void proj_context_log_debug(PJ_CONTEXT *ctx, const char *fmt, ...) {

    /******************************************************************************

       For reporting debugging information.

    ******************************************************************************/

    va_list args;

    va_start(args, fmt);

    pj_vlog(ctx, PJ_LOG_DEBUG, nullptr, fmt, args);

    va_end(args);

}

/*****************************************************************************/

void proj_log_trace(PJ *P, const char *fmt, ...) {

    /******************************************************************************

       For reporting embarrassingly detailed debugging information.

    ******************************************************************************/

    va_list args;

    va_start(args, fmt);

    pj_vlog(pj_get_ctx(P), PJ_LOG_TRACE, P, fmt, args);

    va_end(args);

}

/*****************************************************************************/

void proj_log_func(PJ_CONTEXT *ctx, void *app_data, PJ_LOG_FUNCTION logf) {

    /******************************************************************************

        Put a new logging function into P's context. The opaque object app_data

    is passed as first arg at each call to the logger

    ******************************************************************************/

    if (nullptr == ctx)

        ctx = pj_get_default_ctx();

    ctx->logger_app_data = app_data;

    if (nullptr != logf)

        ctx->logger = logf;

}