/*
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *   Copyright (C) 2008 John Crispin <blogic@openwrt.org> 
 */

#include <stdbool.h>
#include <string.h>
#include <stdlib.h>

#include <uci_config.h>
#include <uci.h>
#include "ucix.h"
/*#include "log.h" */

static struct uci_ptr ptr;

static inline int ucix_get_ptr(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o,
    const char *t)
{
    memset(&ptr, 0, sizeof(ptr));
    ptr.package = p;
    ptr.section = s;
    ptr.option = o;
    ptr.value = t;
    return uci_lookup_ptr(ctx, &ptr, NULL, true);
}

struct uci_context *ucix_init(
    const char *config_file)
{
    struct uci_context *ctx = uci_alloc_context();
/*      uci_add_history_path(ctx, "/var/state"); */
    uci_add_delta_path(ctx, "/var/state");
    if (uci_load(ctx, config_file, NULL) != UCI_OK) {
        fprintf(stderr, "%s/%s is missing or corrupt\n", ctx->savedir,
            config_file);
        return NULL;
    }
    return ctx;
}

struct uci_context *ucix_init_path(
    const char *path,
    const char *config_file)
{
    struct uci_context *ctx = uci_alloc_context();
    if (path)
        uci_set_confdir(ctx, path);
    if (uci_load(ctx, config_file, NULL) != UCI_OK) {
        fprintf(stderr, "%s/%s is missing or corrupt\n", ctx->savedir,
            config_file);
        return NULL;
    }
    return ctx;
}

void ucix_cleanup(
    struct uci_context *ctx)
{
    uci_free_context(ctx);
}

void ucix_save(
    struct uci_context *ctx)
{
    uci_set_savedir(ctx, "/tmp/.uci/");
    uci_save(ctx, NULL);
}

void ucix_save_state(
    struct uci_context *ctx)
{
    uci_set_savedir(ctx, "/var/state/");
    uci_save(ctx, NULL);
}

const char *ucix_get_option(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o)
{
    struct uci_element *e = NULL;
    const char *value = NULL;
    if (ucix_get_ptr(ctx, p, s, o, NULL))
        return NULL;
    if (!(ptr.flags & UCI_LOOKUP_COMPLETE))
        return NULL;
    e = ptr.last;
    switch (e->type) {
        case UCI_TYPE_SECTION:
            value = uci_to_section(e)->type;
            break;
        case UCI_TYPE_OPTION:
            switch (ptr.o->type) {
                case UCI_TYPE_STRING:
                    value = ptr.o->v.string;
                    break;
                default:
                    value = NULL;
                    break;
            }
            break;
        default:
            return 0;
    }

    return value;
}

int ucix_get_option_int(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o,
    int def)
{
    const char *tmp = ucix_get_option(ctx, p, s, o);
    int ret = def;

    if (tmp)
        ret = atoi(tmp);
    return ret;
}

void ucix_add_section(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *t)
{
    if (ucix_get_ptr(ctx, p, s, NULL, t))
        return;
    uci_set(ctx, &ptr);
}

void ucix_add_option(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o,
    const char *t)
{
    if (ucix_get_ptr(ctx, p, s, o, (t) ? (t) : ("")))
        return;
    uci_set(ctx, &ptr);
}

void ucix_add_option_int(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o,
    int t)
{
    char tmp[64];
    snprintf(tmp, 64, "%d", t);
    ucix_add_option(ctx, p, s, o, tmp);
}

void ucix_del(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o)
{
    if (!ucix_get_ptr(ctx, p, s, o, NULL))
        uci_delete(ctx, &ptr);
}

void ucix_revert(
    struct uci_context *ctx,
    const char *p,
    const char *s,
    const char *o)
{
    if (!ucix_get_ptr(ctx, p, s, o, NULL))
        uci_revert(ctx, &ptr);
}

void ucix_for_each_section_type(
    struct uci_context *ctx,
    const char *p,
    const char *t,
    void (*cb) (const char *,
        void *),
    void *priv)
{
    struct uci_element *e;
    if (ucix_get_ptr(ctx, p, NULL, NULL, NULL))
        return;
    uci_foreach_element(&ptr.p->sections, e)
        if (!strcmp(t, uci_to_section(e)->type))
        cb(e->name, priv);
}

int ucix_commit(
    struct uci_context *ctx,
    const char *p)
{
    if (ucix_get_ptr(ctx, p, NULL, NULL, NULL))
        return 1;
    return uci_commit(ctx, &ptr.p, false);
}
