/*****************************************************************************
 *
 * grail - Gesture Recognition And Instantiation Library
 *
 * Copyright (C) 2010 Canonical Ltd.
 *
 * 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/>.
 *
 * Authors:
 *      Henrik Rydberg <rydberg@bitmath.org>
 *
 ****************************************************************************/

#include <grail-gesture.h>
#include <malloc.h>
#include <string.h>
#include <errno.h>
#include "gebuf.h"

#define GESTURE_GAP (1000 * 60 * 60)

struct client_impl {
	enum gesture_state state;
	touch_time_t begin, end;
	struct gebuf buf;
};

int client_init(struct gesture_client *client, void *priv)
{
	struct client_impl *x;
	memset(client, 0, sizeof(*client));
	x = calloc(DIM_GESTURE_TYPE, sizeof(*x));
	if (!x)
		return -ENOMEM;
	client->impl = x;
	client->priv = priv;
	return 0;
}

void client_flag(struct gesture_client *client,
		 const struct gesture_flag *flag)
{
	if (client->priority[flag->type]) {
		struct client_impl *x = &client->impl[flag->type];
		switch(flag->state) {
		case GS_BEGIN:
			x->begin = flag->time;
			x->end = flag->time + GESTURE_GAP;
			break;
		case GS_CANCEL:
			x->end = x->begin;
			break;
		case GS_END:
			x->end = flag->time;
			break;
		}
		x->state = flag->state;
	}
}

void client_event(struct gesture_client *client,
		  const struct gesture_event *ev)
{
	if (client->priority[ev->type]) {
		struct client_impl *x = &client->impl[ev->type];
		gebuf_put(&x->buf, ev);
	}
}

void client_sync(struct gesture_client *client)
{
	struct gesture_event ev;
	struct client_impl *x = client->impl;
	int i, prio = 0;
	for (i = 0; i < DIM_GESTURE_TYPE; i++) {
		if (x[i].begin != x[i].end) {
			if (client->priority[i] > prio)
				prio = client->priority[i];
		}
	}
	for (i = 0; i < DIM_GESTURE_TYPE; i++) {
		if (client->priority[i] < prio) {
			gebuf_clear(&x[i].buf);
		} else if (prio && client->gesture) {
			if (x[i].state == GS_END) {
				while (!gebuf_empty(&x[i].buf)) {
					gebuf_get(&x[i].buf, &ev);
					client->gesture(client, &ev);
				}
			}
		}
	}
	for (i = 0; i < DIM_GESTURE_TYPE; i++)
		if (x[i].state == GS_END)
			x[i].begin = x[i].end;
}

void client_destroy(struct gesture_client *client)
{
	free(client->impl);
	memset(client, 0, sizeof(*client));
}