/*
 * Copyright (c) 2011 Matej Klonfar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup libusbhid
 * @{
 */
/** @file
 * HID report descriptor and report data parser implementation.
 */
#include <usb/hid/hidparser.h>
#include <errno.h>
#include <stdio.h>
#include <mem.h>
#include <stdlib.h>
#include <usb/debug.h>
#include <assert.h>


/**
 * Compares two usages if they are same or not or one of the usages is not
 * set.
 *
 * @param usage1
 * @param usage2
 * @return boolean
 */
#define USB_HID_SAME_USAGE(usage1, usage2)		\
	((usage1 == usage2) || (usage1 == 0) || (usage2 == 0))

/**
 * Compares two usage pages if they are same or not or one of them is not set.
 *
 * @param page1
 * @param page2
 * @return boolean
 */
#define USB_HID_SAME_USAGE_PAGE(page1, page2)	\
	((page1 == page2) || (page1 == 0) || (page2 == 0))


/**
 * Appends one item (couple of usage_path and usage) into the usage path
 * structure
 *
 * @param usage_path Usage path structure
 * @param usage_page Usage page constant
 * @param usage Usage constant
 * @return Error code
 */
errno_t usb_hid_report_path_append_item(usb_hid_report_path_t *usage_path, 
                                    int32_t usage_page, int32_t usage)
{	
	usb_hid_report_usage_path_t *item
		= malloc(sizeof(usb_hid_report_usage_path_t));

	if (item == NULL) {
		return ENOMEM;
	}
	link_initialize(&item->rpath_items_link);

	item->usage = usage;
	item->usage_page = usage_page;
	item->flags = 0;
	
	list_append (&item->rpath_items_link, &usage_path->items);
	usage_path->depth++;
	return EOK;
}


/**
 * Removes last item from the usage path structure
 * @param usage_path 
 * @return void
 */
void usb_hid_report_remove_last_item(usb_hid_report_path_t *usage_path)
{
	link_t *item_link;
	usb_hid_report_usage_path_t *item;
	
	if(!list_empty(&usage_path->items)){
		item_link = list_last(&usage_path->items);
		item = list_get_instance(item_link,
		    usb_hid_report_usage_path_t, rpath_items_link);
		list_remove(item_link);
		usage_path->depth--;
		free(item);
	}
}


/**
 * Nulls last item of the usage path structure.
 *
 * @param usage_path
 * @return void
 */
void usb_hid_report_null_last_item(usb_hid_report_path_t *usage_path)
{
	usb_hid_report_usage_path_t *item;
	
	if(!list_empty(&usage_path->items)){
		item = list_get_instance(list_last(&usage_path->items),
			usb_hid_report_usage_path_t, rpath_items_link);

		memset(item, 0, sizeof(usb_hid_report_usage_path_t));
	}
}


/**
 * Modifies last item of usage path structure by given usage page or usage
 *
 * @param usage_path Opaque usage path structure
 * @param tag Class of currently processed tag (Usage page tag falls into Global
 * class but Usage tag into the Local)
 * @param data Value of the processed tag
 * @return void
 */
void usb_hid_report_set_last_item(usb_hid_report_path_t *usage_path, 
                                  int32_t tag, int32_t data)
{
	usb_hid_report_usage_path_t *item;
	
	if(!list_empty(&usage_path->items)){
		item = list_get_instance(list_last(&usage_path->items),
		     usb_hid_report_usage_path_t, rpath_items_link);

		switch(tag) {
			case USB_HID_TAG_CLASS_GLOBAL:
				item->usage_page = data;
				break;
			case USB_HID_TAG_CLASS_LOCAL:
				item->usage = data;
				break;
		}
	}
	
}


/**
 *
 *
 *
 *
 */
void usb_hid_print_usage_path(usb_hid_report_path_t *path)
{
	usb_log_debug("USAGE_PATH FOR RId(%d):", path->report_id);
	usb_log_debug("\tLENGTH: %d", path->depth);

	list_foreach(path->items, rpath_items_link,
	    usb_hid_report_usage_path_t, path_item) {

		usb_log_debug("\tUSAGE_PAGE: %X", path_item->usage_page);
		usb_log_debug("\tUSAGE: %X", path_item->usage);
		usb_log_debug("\tFLAGS: %d", path_item->flags);
	}
}

/** Compare two usage paths structures
 *
 * @param report_path Usage path structure to compare with @path
 * @param path        Usage patrh structure to compare
 * @param flags       Flags determining the mode of comparison
 *
 * @return 0 if both paths are identical, non zero number otherwise
 *
 */
int usb_hid_report_compare_usage_path(usb_hid_report_path_t *report_path,
    usb_hid_report_path_t *path, int flags)
{
	usb_hid_report_usage_path_t *report_item;
	usb_hid_report_usage_path_t *path_item;
	
	link_t *report_link;
	link_t *path_link;
	
	int only_page;
	
	if (report_path->report_id != path->report_id) {
		if (path->report_id != 0) {
			return 1;
		}
	}
	
	// Empty path match all others
	if (path->depth == 0) {
		return 0;
	}
	
	if ((only_page = flags & USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY) != 0) {
		flags -= USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY;
	}
	
	switch (flags) {
	/* Path is somewhere in report_path */
	case USB_HID_PATH_COMPARE_ANYWHERE:
		if (path->depth != 1) {
			return 1;
		}
		
		path_link = list_first(&path->items);
		path_item = list_get_instance(path_link,
		    usb_hid_report_usage_path_t, rpath_items_link);
		
		list_foreach(report_path->items, rpath_items_link,
		    usb_hid_report_usage_path_t, report_item) {
			if (USB_HID_SAME_USAGE_PAGE(report_item->usage_page,
			    path_item->usage_page)) {
				
				if (only_page == 0) {
					if (USB_HID_SAME_USAGE(report_item->usage,
					    path_item->usage))
						return 0;
				} else {
					return 0;
				}
			}
		}
		
		return 1;
		break;
	
	/* The paths must be identical */
	case USB_HID_PATH_COMPARE_STRICT:
		if (report_path->depth != path->depth) {
			return 1;
		}
		/* Fallthrough */
	
	/* Path is prefix of the report_path */
	case USB_HID_PATH_COMPARE_BEGIN:
		report_link = report_path->items.head.next;
		path_link = path->items.head.next;
		
		while ((report_link != &report_path->items.head) &&
		    (path_link != &path->items.head)) {
			
			report_item = list_get_instance(report_link,
			    usb_hid_report_usage_path_t, rpath_items_link);
			
			path_item = list_get_instance(path_link,
			    usb_hid_report_usage_path_t, rpath_items_link);
			
			if (!USB_HID_SAME_USAGE_PAGE(report_item->usage_page,
			    path_item->usage_page) || ((only_page == 0) &&
			    !USB_HID_SAME_USAGE(report_item->usage,
			    path_item->usage))) {
				return 1;
			} else {
				report_link = report_link->next;
				path_link = path_link->next;
			}
		}
		
		if ((((flags & USB_HID_PATH_COMPARE_BEGIN) != 0) &&
		    (path_link == &path->items.head)) ||
		    ((report_link == &report_path->items.head) &&
		    (path_link == &path->items.head))) {
			return 0;
		} else {
			return 1;
		}
		break;
	
	/* Path is suffix of report_path */
	case USB_HID_PATH_COMPARE_END:
		report_link = report_path->items.head.prev;
		path_link = path->items.head.prev;
		
		if (list_empty(&path->items)) {
			return 0;
		}
		
		while ((report_link != &report_path->items.head) &&
		      (path_link != &path->items.head)) {
			report_item = list_get_instance(report_link,
			    usb_hid_report_usage_path_t, rpath_items_link);
			
			path_item = list_get_instance(path_link,
			    usb_hid_report_usage_path_t, rpath_items_link);
			
			if (!USB_HID_SAME_USAGE_PAGE(report_item->usage_page,
			    path_item->usage_page) || ((only_page == 0) &&
			    !USB_HID_SAME_USAGE(report_item->usage,
			    path_item->usage))) {
				return 1;
			} else {
				report_link = report_link->prev;
				path_link = path_link->prev;
			}
		}
		
		if (path_link == &path->items.head) {
			return 0;
		} else {
			return 1;
		}
		break;
	
	default:
		return -1;
	}
}

/**
 * Allocates and initializes new usage path structure.
 *
 * @return Initialized usage path structure
 */
usb_hid_report_path_t *usb_hid_report_path(void)
{
	usb_hid_report_path_t *path;
	path = malloc(sizeof(usb_hid_report_path_t));
	if(path == NULL){
		return NULL;
	}
	else {
		path->depth = 0;
		path->report_id = 0;
		link_initialize(&path->cpath_link);
		list_initialize(&path->items);
		return path;
	}
}


/**
 * Releases given usage path structure.
 *
 * @param path usage path structure to release
 * @return void
 */
void usb_hid_report_path_free(usb_hid_report_path_t *path)
{
	if (path == NULL)
		return;
	while(!list_empty(&path->items)){
		usb_hid_report_remove_last_item(path);
	}

	assert_link_not_used(&path->cpath_link);
	free(path);
}


/**
 * Clone content of given usage path to the new one
 *
 * @param usage_path Usage path structure to clone
 * @return New copy of given usage path structure
 */
usb_hid_report_path_t *usb_hid_report_path_clone(
	usb_hid_report_path_t *usage_path)
{
	usb_hid_report_usage_path_t *new_path_item;
	usb_hid_report_path_t *new_usage_path = usb_hid_report_path ();

	if(new_usage_path == NULL){
		return NULL;
	}

	new_usage_path->report_id = usage_path->report_id;
	
	if(list_empty(&usage_path->items)){
		return new_usage_path;
	}

	list_foreach(usage_path->items, rpath_items_link,
	    usb_hid_report_usage_path_t, path_item) {

		new_path_item = malloc(sizeof(usb_hid_report_usage_path_t));
		if(new_path_item == NULL) {
			return NULL;
		}
		
		link_initialize(&new_path_item->rpath_items_link);
		new_path_item->usage_page = path_item->usage_page;
		new_path_item->usage = path_item->usage;		
		new_path_item->flags = path_item->flags;		
		
		list_append(&new_path_item->rpath_items_link,
		    &new_usage_path->items);
		new_usage_path->depth++;
	}

	return new_usage_path;
}


/**
 * Sets report id in usage path structure
 *
 * @param path Usage path structure
 * @param report_id Report id to set
 * @return Error code
 */
errno_t usb_hid_report_path_set_report_id(usb_hid_report_path_t *path, 
	uint8_t report_id)
{
	if(path == NULL){
		return EINVAL;
	}

	path->report_id = report_id;
	return EOK;
}

/**
 * @}
 */
