/**
 * vimb - a webkit based vim like browser.
 *
 * Copyright (C) 2012-2018 Daniel Carl
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses/.
 */

#include <glib.h>
#include <string.h>
#include <unistd.h>
#include "../config.h"
#include "ext-util.h"

/**
 * Evaluates given string as script and return if this call succeed or not.
 */
gboolean ext_util_js_eval(JSContextRef ctx, const char *script, JSValueRef *result)
{
    JSStringRef js_str;
    JSValueRef exc = NULL, res = NULL;

    js_str = JSStringCreateWithUTF8CString(script);
    res = JSEvaluateScript(ctx, js_str, JSContextGetGlobalObject(ctx), NULL, 0, &exc);
    JSStringRelease(js_str);

    if (exc) {
        *result = exc;
        return FALSE;
    }

    *result = res;
    return TRUE;
}

/**
 * Creates a temporary file with given content.
 *
 * Upon success, and if file is non-NULL, the actual file path used is
 * returned in file. This string should be freed with g_free() when not
 * needed any longer.
 */
gboolean ext_util_create_tmp_file(const char *content, char **file)
{
    int fp;
    ssize_t bytes, len;

    fp = g_file_open_tmp(PROJECT "-XXXXXX", file, NULL);
    if (fp == -1) {
        g_critical("Could not create temp file %s", *file);
        g_free(*file);
        return FALSE;
    }

    len = strlen(content);

    /* write content into temporary file */
    bytes = write(fp, content, len);
    if (bytes < len) {
        close(fp);
        unlink(*file);
        g_critical("Could not write temp file %s", *file);
        g_free(*file);

        return FALSE;
    }
    close(fp);

    return TRUE;
}

/**
 * Returns a new allocates string for given value reference.
 * String must be freed if not used anymore.
 */
char* ext_util_js_ref_to_string(JSContextRef ctx, JSValueRef ref)
{
    char *string;
    size_t len;
    JSStringRef str_ref;

    g_return_val_if_fail(ref != NULL, NULL);

    str_ref = JSValueToStringCopy(ctx, ref, NULL);
    len     = JSStringGetMaximumUTF8CStringSize(str_ref);

    string = g_new0(char, len);
    JSStringGetUTF8CString(str_ref, string, len);
    JSStringRelease(str_ref);

    return string;
}