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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 <libadt/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);
    //  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);
        }
    }
}