/*
 * nanowasm, a tiny WebAssembly/Wasm interpreter
 * Copyright (C) 2023-2024  Xavier Del Campo Romero
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#include <nw/log.h>
#include <nw/ops.h>
#include <nanowasm/nw.h>
#include <nw/interp.h>
#include <nw/search.h>
#include <nw/sections.h>
#include <nw/types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

static int call(struct nw_interp *const i, const varuint32 function_index)
{
    FILE *const f = i->f;
    const struct nw_mod *const m = i->cfg.m;
    struct nw_frame fr = {0};
    struct search_fn fn;

    /* TODO: treat import functions. */
    if (search_fn(function_index, m, f, &fn))
    {
        LOG("%s: search_fn failed\n", __func__);
        return -1;
    }
    else if (section_type_push(f, m, fn.index, &fr))
    {
        LOG("%s: section_type_push failed\n", __func__);
        return -1;
    }
    else if (section_code_push(i, fn.start))
    {
        LOG("%s: section_code_push failed\n", __func__);
        return -1;
    }

    return 0;
}

static int op(struct nw_interp *const i, FILE *const f)
{
    varuint32 function_index;

    if (varuint32_read(f, &function_index))
    {
        LOG("%s: varuint32_read failed\n", __func__);
        return -1;
    }
    else if (i && call(i, function_index))
    {
        LOG("%s: call failed\n", __func__);
        return -1;
    }

    return 0;
}

int op_call(struct nw_interp *const i)
{
    return op(i, i->f);
}

int check_call(FILE *const f)
{
    return op(NULL, f);
}