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/*

 * Copyright (C) 2006 Josef Cejka

 * 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.

 */

#include <ipc/ipc.h>

#include <ipc/services.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <ipc/ns.h>

#include <errno.h>

#include <arch/kbd.h>

#include <kbd.h>

#include <key_buffer.h>

#include <fifo.h>

#define NAME "KBD"

#define KBD_REQUEST_MAX 32 /**< Maximum requests buffered until keypress */

int main(int argc, char **argv)

{

	ipc_call_t call;

	ipc_callid_t callid;

	char connected = 0;

	int res;

	int c;

	ipcarg_t phonead;

	ipcarg_t retval, arg1, arg2;

	/* Counter of unsatisfied calls */

	fifo_count_t callers_counter = 0;

	/* Fifo with callid's of unsatisfied calls requred for answer */

	FIFO_INITIALIZE_STATIC(callers_buffer, ipc_callid_t, KBD_REQUEST_MAX);

	printf("Uspace kbd service started.\n");

	/* Initialize arch dependent parts */

	if (!(res = kbd_arch_init())) {

			printf("Kbd registration failed with retval %d.\n", res);

			return -1;

			};

	/* Initialize key buffer */

	key_buffer_init();

	/* Register service at nameserver */

	printf("%s: Registering at naming service.\n", NAME);

	if ((res = ipc_connect_to_me(PHONE_NS, SERVICE_KEYBOARD, 0, &phonead)) != 0) {

		printf("%s: Error: Registering at naming service failed.\n", NAME);

		return -1;

	};

	while (1) {

		callid = ipc_wait_for_call(&call, 0);

	//	printf("%s:Call phone=%lX..", NAME, call.in_phone_hash);

		switch (IPC_GET_METHOD(call)) {

			case IPC_M_PHONE_HUNGUP:

				if (connected) {

					/* If nobody's connected, clear keybuffer and dont store new keys */

					if (--connected == 0) {

						callers_counter = 0;

						callers_buffer.head = callers_buffer.tail = 0;

						key_buffer_free();	

					}

					printf("%s: Phone hung up.\n", NAME);

				} else {

					printf("%s: Oops, got phone hung up, but nobody connected.\n", NAME);

				}

				retval = 0;

				break;

			case IPC_M_CONNECT_ME_TO:

			//	printf("%s: Connect me (%P) to: %zd\n",NAME, IPC_GET_ARG3(call), IPC_GET_ARG1(call));

				/* Only one connected client allowed */

				if (connected) {

					retval = ELIMIT;

				} else {

					retval = 0;

					connected = 1;

				}

				break;

			case IPC_M_INTERRUPT:

				if (connected) {

					/* recode scancode and store it into key buffer */

					kbd_arch_process(IPC_GET_ARG2(call));

					//printf("%s: GOT INTERRUPT: %c\n", NAME, IPC_GET_ARG2(call));

					/* Some callers could awaiting keypress - if its true, we have to send keys to them.

					 * One interrupt can store more than one key into buffer. */

					retval = 0;

					arg2 = 0xbeef;

					while ((callers_counter) && (!key_buffer_empty())) {

						callers_counter--;

						if (!key_buffer_pop((char *)&arg1)) {

							printf("%s: KeyBuffer empty but it should not be.\n");

							break;

						}

						ipc_answer_fast(fifo_pop(callers_buffer), retval, arg1, arg2);

					}

				}

				break;

			case KBD_GETCHAR:

	//			printf("%s: Getchar: ", NAME);

				retval = 0;

				arg1 = 0;	

				if (!key_buffer_pop((char *)&arg1)) {

					if (callers_counter < KBD_REQUEST_MAX) {

						callers_counter++;

						fifo_push(callers_buffer, callid);

					} else {

						retval = ELIMIT;

					}

					continue;

				};

				arg2 = 0xbeef;

			//	printf("GetChar return %c\n", arg1);

				break;

			default:

				printf("%s: Unknown method: %zd\n", NAME, IPC_GET_METHOD(call));

				retval = ENOENT;

				break;

		}

		if (! (callid & IPC_CALLID_NOTIFICATION)) {

			ipc_answer_fast(callid, retval, arg1, arg2);

		}

	}

}