/*-
 Author: Brian Tiffin
 Dedicated to the public domain
 
 Date: October 2016
 Modified: 2016-12-09/06:37-0500

 Ficl License and Disclaimer:
     Copyright (c) 1997-2001 John Sadler (john_sadler@alum.mit.edu)
     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 THE 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. 
+*/
/*
 unificl-v1.c a Forth interpreter in Unicon with loadfunc

 tectonics:
     gcc -o unificl.so -shared -fpic unificl-v1.c -lficl
                
*/
#include <stdio.h>
#include <stdlib.h>

#include "ficl.h"
#include "icall.h"

/* Global variables to track VM across calls */
int unificlLoaded = 0;
ficlVm *unificlVm = NULL;
ficlSystem *unificlSystem = NULL;

/* Unicon calling ficl */
int
unificl(int argc, descriptor *argv)
{
    int returnValue = 0;
    char buffer[256];

    /* Need a string of code parameter */
    if (argc < 1) Error(103);
    ArgString(1);

    /* start up the ficl VM */
    if (!unificlLoaded) {
        unificlSystem = ficlSystemCreate(NULL);
        ficlSystemCompileExtras(unificlSystem);
        unificlVm = ficlSystemCreateVm(unificlSystem);
        //returnValue = ficlVmEvaluate(unificlVm,
        //                             ".ver .( " __DATE__ " ) cr quit");
        unificlLoaded = 1;
    }

    /* Run the Forth code and get an integer status */
    returnValue = ficlVmEvaluate(unificlVm, StringVal(argv[1]));

    /* return to Unicon */
    RetInteger(returnValue);
}

/* run down the ficl VM, return a 0 to Unicon */
int
unificlRundown(int argc, descriptor *argv)
{
    ficlSystemDestroy(unificlSystem);
    unificlVm = NULL;
    unificlSystem = NULL;
    unificlLoaded = 0;
    RetInteger(0);
}

/* Return the stack */
int
unificlStack(int argc, descriptor *argv)
{
    int depth;
    int i;
    listblock *list;

    if (!unificlLoaded) {
        Error(117); /* report engine not loaded, missing main procedure */
    }

    depth = ficlStackDepth(unificlVm->dataStack);
    int *integers = malloc(sizeof(int) * depth);
    for (i = 0; i < depth; i++) {
        integers[i] = ficlStackFetch(unificlVm->dataStack, i).i;
    }
    list = mkIlist(integers, depth);

    /* return to Unicon */
    free(integers);
    RetList(list);
}

/* Return the floating point stack */
int
unificlFloatStack(int argc, descriptor *argv)
{
    int depth;
    int i;
    listblock *list;

    if (!unificlLoaded) {
        Error(117); /* report engine not loaded, missing main procedure */
    }

    depth = ficlStackDepth(unificlVm->floatStack);
    double *doubles = malloc(sizeof(double) * depth);
    for (i = 0; i < depth; i++) {
        doubles[i] = ficlStackFetch(unificlVm->floatStack, i).f;
    }
    list = mkRlist(doubles, depth);

    /* return to Unicon */
    free(doubles);
    RetList(list);
}