/* list of projection system errno values */

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

#include "proj.h"
#include "proj_config.h"
#include "proj_internal.h"


const char* proj_errno_string(int err) {
    return proj_context_errno_string(pj_get_default_ctx(), err);
}

static const struct
{
    int num;
    const char *str;
} error_strings[] = {

    { PROJ_ERR_INVALID_OP_WRONG_SYNTAX,                  _("Invalid PROJ string syntax") },
    { PROJ_ERR_INVALID_OP_MISSING_ARG,                   _("Missing argument") },
    { PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE,             _("Invalid value for an argument") },
    { PROJ_ERR_INVALID_OP_MUTUALLY_EXCLUSIVE_ARGS,       _("Mutually exclusive arguments") },
    { PROJ_ERR_INVALID_OP_FILE_NOT_FOUND_OR_INVALID,     _("File not found or invalid") },
    { PROJ_ERR_COORD_TRANSFM_INVALID_COORD,              _("Invalid coordinate") },
    { PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN,  _("Point outside of projection domain") },
    { PROJ_ERR_COORD_TRANSFM_NO_OPERATION,               _("No operation matching criteria found for coordinate") },
    { PROJ_ERR_COORD_TRANSFM_OUTSIDE_GRID,               _("Coordinate to transform falls outside grid") },
    { PROJ_ERR_COORD_TRANSFM_GRID_AT_NODATA,             _("Coordinate to transform falls into a grid cell that evaluates to nodata") },
    { PROJ_ERR_OTHER_API_MISUSE,                         _("API misuse") },
    { PROJ_ERR_OTHER_NO_INVERSE_OP,                      _("No inverse operation") },
    { PROJ_ERR_OTHER_NETWORK_ERROR,                      _("Network error when accessing a remote resource") },
};

const char PROJ_DLL * proj_context_errno_string(PJ_CONTEXT* ctx, int err)
{
    if( ctx == nullptr )
        ctx = pj_get_default_ctx();

    if (0==err)
        return nullptr;

    const char* str = nullptr;
    for( const auto& num_str_pair: error_strings )
    {
        if( err == num_str_pair.num )
        {
            str = num_str_pair.str;
            break;
        }
    }

    if( str == nullptr && err > 0 && (err & PROJ_ERR_INVALID_OP) != 0 )
    {
        str = _("Unspecified error related to coordinate operation initialization");
    }
    if( str == nullptr && err > 0 && (err & PROJ_ERR_COORD_TRANSFM) != 0 )
    {
        str = _("Unspecified error related to coordinate transformation");
    }

    if (str) {
        ctx->lastFullErrorMessage = str;
    }
    else
    {
        ctx->lastFullErrorMessage.resize(50);
        snprintf(&ctx->lastFullErrorMessage[0], ctx->lastFullErrorMessage.size(),
                _("Unknown error (code %d)"), err);
        ctx->lastFullErrorMessage.resize(strlen(ctx->lastFullErrorMessage.data()));
    }
    return ctx->lastFullErrorMessage.c_str();
}