/*
 * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Alex Hornung <ahornung@gmail.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 */
#include <sys/types.h>
#include <sys/device.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/queue.h>
#include <sys/un.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include <libprop/proplib.h>
#include <sys/udev.h>
#define LIBDEVATTR_INTERNAL
#include "devattr.h"

struct udev_enumerate {
        struct udev     *udev_ctx;
        prop_array_t    ev_filt;
        prop_array_t    pa;
        int     refs;
        TAILQ_HEAD(, udev_list_entry)   list_entries;
};

struct udev_list_entry {
        struct udev     *udev_ctx;
        prop_dictionary_t       dict;
        TAILQ_ENTRY(udev_list_entry)    link;
};

struct udev_enumerate *
udev_enumerate_new(struct udev *udev_ctx)
{
        struct udev_enumerate *udev_enum;

        udev_enum = malloc(sizeof(struct udev_enumerate));

        udev_enum->refs = 1;
        udev_enum->ev_filt = NULL;
        udev_enum->pa = NULL;
        TAILQ_INIT(&udev_enum->list_entries);
        udev_enum->udev_ctx = udev_ref(udev_ctx);

        return udev_enum;
}

struct udev_enumerate *
udev_enumerate_ref(struct udev_enumerate *udev_enum)
{
        atomic_add_int(&udev_enum->refs, 1);

        return udev_enum;
}

void
udev_enumerate_unref(struct udev_enumerate *udev_enum)
{
        struct udev_list_entry  *le;
        int refcount;

        refcount = atomic_fetchadd_int(&udev_enum->refs, -1);

        if (refcount == 1) {
                atomic_subtract_int(&udev_enum->refs, 0x400); /* in destruction */
                if (udev_enum->pa != NULL)
                        prop_object_release(udev_enum->pa);
                if (udev_enum->ev_filt != NULL)
                        prop_object_release(udev_enum->ev_filt);

                while (!TAILQ_EMPTY(&udev_enum->list_entries)) {
                        le = TAILQ_FIRST(&udev_enum->list_entries);
                        TAILQ_REMOVE(&udev_enum->list_entries, le, link);
                        prop_object_release(le->dict);
                        free(le);
                }
                udev_unref(udev_enum->udev_ctx);
                free(udev_enum);
        }
}

struct udev *
udev_enumerate_get_udev(struct udev_enumerate *udev_enum)
{
        return udev_enum->udev_ctx;
}

int
udev_enumerate_scan_devices(struct udev_enumerate *udev_enum)
{
        prop_array_t    pa;

        if (udev_get_fd(udev_enum->udev_ctx) == -1)
                return -1;

        pa = udevd_request_devs(udev_get_fd(udev_enum->udev_ctx), udev_enum->ev_filt);
        if (pa == NULL)
                return -1;

        prop_object_retain(pa);

        if (udev_enum->pa != NULL)
                prop_object_release(udev_enum->pa);

        udev_enum->pa = pa;

        return 0;
}

struct udev_list_entry *
udev_enumerate_get_list_entry(struct udev_enumerate *udev_enum)
{
        struct udev_list_entry *le;
        prop_object_iterator_t  iter;
        prop_dictionary_t       dict;

        /* If the list is not empty, assume it was populated in an earlier call */
        if (!TAILQ_EMPTY(&udev_enum->list_entries))
                return TAILQ_FIRST(&udev_enum->list_entries);

        iter = prop_array_iterator(udev_enum->pa);
        if (iter == NULL)
                return NULL;

        while ((dict = prop_object_iterator_next(iter)) != NULL) {
                le = malloc(sizeof(struct udev_list_entry));
                if (le == NULL)
                        goto out;

                prop_object_retain(dict);
                le->dict = dict;
                le->udev_ctx = udev_enum->udev_ctx;
                TAILQ_INSERT_TAIL(&udev_enum->list_entries, le, link);
        }

        le = TAILQ_FIRST(&udev_enum->list_entries);

out:
        prop_object_iterator_release(iter);
        return le;
}

prop_array_t
udev_enumerate_get_array(struct udev_enumerate *udev_enum)
{
        return udev_enum->pa;
}

struct udev_list_entry *
udev_list_entry_get_next(struct udev_list_entry *list_entry)
{
        return TAILQ_NEXT(list_entry, link);
}

prop_dictionary_t
udev_list_entry_get_dictionary(struct udev_list_entry *list_entry)
{
        return list_entry->dict;
}

struct udev_device *
udev_list_entry_get_device(struct udev_list_entry *list_entry)
{
        struct udev_device *udev_dev;

        udev_dev = udev_device_new_from_dictionary(list_entry->udev_ctx,
                                                   list_entry->dict);

        return udev_dev;
}

int
udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enum,
                                                const char *subsystem)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_WILDCARD,
                                                 0,
                                                 "subsystem",
                                                 __DECONST(char *, subsystem));

        return ret;
}

int
udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enum,
                                                const char *subsystem)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_WILDCARD,
                                                 1,
                                                 "subsystem",
                                                 __DECONST(char *, subsystem));

        return ret;
}

int
udev_enumerate_add_match_expr(struct udev_enumerate *udev_enum,
                              const char *key,
                              char *expr)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_WILDCARD,
                                                 0,
                                                 key,
                                                 expr);

        return ret;
}

int
udev_enumerate_add_nomatch_expr(struct udev_enumerate *udev_enum,
                                const char *key,
                                char *expr)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_WILDCARD,
                                                 1,
                                                 key,
                                                 expr);

        return ret;
}

int
udev_enumerate_add_match_regex(struct udev_enumerate *udev_enum,
                              const char *key,
                              char *expr)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_REGEX,
                                                 0,
                                                 key,
                                                 expr);

        return ret;
}

int
udev_enumerate_add_nomatch_regex(struct udev_enumerate *udev_enum,
                                const char *key,
                                char *expr)
{
        int ret;

        ret = _udev_enumerate_filter_add_match_gen(udev_enum,
                                                 EVENT_FILTER_TYPE_REGEX,
                                                 1,
                                                 key,
                                                 expr);

        return ret;
}

int
_udev_enumerate_filter_add_match_gen(struct udev_enumerate *udev_enum,
                                     int type,
                                     int neg,
                                     const char *key,
                                     char *expr)
{
        prop_array_t            pa;
        int error;

        if (udev_enum->ev_filt == NULL) {
                pa = prop_array_create_with_capacity(5);
                if (pa == NULL)
                        return -1;

                udev_enum->ev_filt = pa;
        }

        error = _udev_filter_add_match_gen(udev_enum->ev_filt, type, neg, key, expr);

        return error;
}