/*
 Copyright 2015 IoT.bzh

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/

#define _GNU_SOURCE

#include <errno.h>
#include <syslog.h>
#include <string.h>
#include <ctype.h>

#include "verbose.h"
#include "wgtpkg.h"
#include "wgt.h"
#include "wgt-info.h"
#include "secmgr-wrap.h"

static int check_defined(const void *data, const char *name)
{
	if (data)
		return 0;
	syslog(LOG_ERR, "widget has no defined '%s' (temporary constraints)", name);
	errno = EINVAL;
	return -1;
}

static int check_valid_string(const char *value, const char *name)
{
	int pos;
	char c;

	if (check_defined(value, name))
		return -1;
	pos = 0;
	c = value[pos];
	while(c) {
		if (!isalnum(c) && !strchr(".-_", c)) {
			syslog(LOG_ERR, "forbidden char %c in '%s' -> '%s' (temporary constraints)", c, name, value);
			errno = EINVAL;
			return -1;			
		}
		c = value[++pos];
	}
	return 0;
}

static int check_temporary_constraints(const struct wgt_desc *desc)
{
	int result = check_valid_string(desc->id, "id");
	result |= check_valid_string(desc->version, "version");
	result |= check_defined(desc->icons, "icon");
	result |= check_defined(desc->content_src, "content");
	if (result)
		return result;
	if (desc->icons->next) {
		syslog(LOG_ERR, "widget has more than one icon defined (temporary constraints)");
		errno = EINVAL;
		result = -1;
	}
	return 0;
}

static int check_permissions(const char *name, int required)
{
	if (permission_exists(name)) {
		if (request_permission(name)) {
			debug("granted permission: %s", name);
		} else if (required) {
			syslog(LOG_ERR, "ungranted permission required: %s", name);
			errno = EPERM;
			return 0;
		} else {
			notice("ungranted permission optional: %s", name);
		}
	}
	return 1;
}

static int check_widget(const struct wgt_desc *desc)
{
	int result;
	const struct wgt_desc_feature *feature;

	result = check_temporary_constraints(desc);
	feature = desc->features;
	while(feature) {
		if (!check_permissions(feature->name, feature->required))
			result = -1;
		feature = feature->next;
	}
	return result;
}

static int move_widget(const char *root, const struct wgt_desc *desc, int force)
{
	char newdir[PATH_MAX];
	int rc;

	rc = snprintf(newdir, sizeof newdir, "%s/%s/%s", root, desc->id, desc->version);
	if (rc >= sizeof newdir) {
		syslog(LOG_ERR, "path to long: %s/%s/%s", root, desc->id, desc->version);
		errno = EINVAL;
		return -1;
	}

	return move_workdir(newdir, 1, force);
}

static int install_security(struct wgt_info *ifo)
{
	int rc;

	rc = secmgr_init(wgt_info_desc(ifo)->
}

/* install the widget of the file */
void install_widget(const char *wgtfile, const char *root, int force)
{
	struct wgt_info *ifo;
	const struct wgt_desc *desc;

	notice("-- INSTALLING widget %s --", wgtfile);

	/* workdir */
	if (make_workdir_base(root, "UNPACK", 0)) {
		syslog(LOG_ERR, "failed to create a working directory");
		goto error1;
	}

	if (zread(wgtfile, 0))
		goto error2;

	if (check_all_signatures())
		goto error2;

	ifo = wgt_info_createat(workdirfd, NULL, 1, 1, 1);
	if (!ifo)
		goto error2;

	desc = wgt_info_desc(ifo);
	if (check_widget(desc))
		goto error3;

	if (move_widget(root, desc, force))
		goto error3;

	
	
	return;

error3:
	wgt_info_unref(ifo);

error2:
	remove_workdir();

error1:
	return;
}