/* Copyright (C) 2014 Daniel Dressler and contributors
 *
 * 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. */

#pragma once

#include <libusb.h>
#include <semaphore.h>

/* In seconds */
#define PRINTER_CRASH_TIMEOUT_RECEIVE (60 * 60 * 6)
#define PRINTER_CRASH_TIMEOUT_ANSWER 5
#define CONN_STALE_THRESHHOLD 5

struct usb_interface {
  uint8_t interface_number;
  uint8_t libusb_interface_index;
  int interface_alt;
  uint8_t endpoint_in;
  uint8_t endpoint_out;
  sem_t lock;
};

struct usb_sock_t {
  libusb_context *context;
  libusb_device_handle *printer;
  char *device_id;
  int max_packet_size;

  uint32_t num_interfaces;
  struct usb_interface *interfaces;

  uint32_t num_staled;
  sem_t num_staled_lock;

  sem_t pool_manage_lock;
  uint32_t num_avail;
  uint32_t num_taken;

  uint32_t *interface_pool;
};

struct usb_conn_t {
  struct usb_sock_t *parent;
  struct usb_interface *interface;
  uint32_t interface_index;
  int is_staled;
};

struct usb_sock_t *usb_open(void);
void usb_close(struct usb_sock_t *);

int usb_can_callback(struct usb_sock_t *);
void usb_register_callback(struct usb_sock_t *);

struct usb_conn_t *usb_conn_acquire(struct usb_sock_t *);
void usb_conn_release(struct usb_conn_t *);

int usb_conn_packet_send(struct usb_conn_t *, struct http_packet_t *);
struct http_packet_t *usb_conn_packet_get(struct usb_conn_t *, struct http_message_t *);