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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 <kbd.h>

#include <fb.h>

#include <ipc/ipc.h>

#include <ipc/fb.h>

#include <ipc/services.h>

#include <errno.h>

#include <key_buffer.h>

#include <console.h>

#include <unistd.h>

#include <async.h>

#include <libadt/fifo.h>

#include <screenbuffer.h>

#define CONSOLE_COUNT 12 

#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "CONSOLE"

int active_console = 1;

struct {

    int phone;      /**< Framebuffer phone */

    int rows;       /**< Framebuffer rows */

    int cols;       /**< Framebuffer columns */

} fb_info;

typedef struct {

    keybuffer_t keybuffer;

    FIFO_CREATE_STATIC(keyrequests, ipc_callid_t , MAX_KEYREQUESTS_BUFFERED);

    int keyrequest_counter;

    int client_phone;

    int used;

    screenbuffer_t screenbuffer;

} connection_t;

connection_t connections[CONSOLE_COUNT];

static int find_free_connection()

{

    int i = 0;

    while (i < CONSOLE_COUNT) {

        if (connections[i].used == 0)

            return i;

        ++i;

    }

    return CONSOLE_COUNT;

}

static int find_connection(int client_phone)

{

    int i = 0;

    while (i < CONSOLE_COUNT) {

        if (connections[i].client_phone == client_phone)

            return i;

        ++i;

    }

    return  CONSOLE_COUNT;

}

/** Check key and process special keys.

 *

 * */

static void write_char(int console, char key)

{

    screenbuffer_t *scr = &(connections[console].screenbuffer);

    switch (key) {

        case '\n':

            scr->position_y += 1;

            scr->position_x =  0;

            break;

        case '\r':

            break;

        case '\t':

            scr->position_x += 8;

            scr->position_x -= scr->position_x % 8;

            break;

        case '\b':

            if (scr->position_x == 0)

                break;

            scr->position_x--;

            if (console == active_console) {

                ipc_call_async_3(fb_info.phone, FB_PUTCHAR, ' ', scr->position_y, scr->position_x, NULL, NULL);

            }

            screenbuffer_putchar(scr, ' ');

            break;

        default:   

            if (console == active_console) {

                ipc_call_async_3(fb_info.phone, FB_PUTCHAR, key, scr->position_y, scr->position_x, NULL, NULL);

            }

            screenbuffer_putchar(scr, key);

            scr->position_x++;

    }

    scr->position_y += (scr->position_x >= scr->size_x);

    if (scr->position_y >= scr->size_y) {

        scr->position_y = scr->size_y - 1;

        screenbuffer_clear_line(scr, scr->top_line++);

        ipc_call_async(fb_info.phone, FB_SCROLL, 1, NULL, NULL);

    }

    scr->position_x = scr->position_x % scr->size_x;

    scr->position_y = scr->position_y  % scr->size_y;

    ipc_call_async_2(fb_info.phone, FB_CURSOR_GOTO, scr->position_y, scr->position_x, NULL, NULL);

}

/* Handler for keyboard */

static void keyboard_events(ipc_callid_t iid, ipc_call_t *icall)

{

    ipc_callid_t callid;

    ipc_call_t call;

    int retval;

    int i, j;

    char c,d;

    connection_t *conn;

    /* Ignore parameters, the connection is alread opened */

    while (1) {

        callid = async_get_call(&call);

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            ipc_answer_fast(callid,0,0,0);

            /* TODO: Handle hangup */

            return;

        case KBD_PUSHCHAR:

            /* got key from keyboard driver */

            retval = 0;

            c = IPC_GET_ARG1(call);

            /* switch to another virtual console */

            conn = &connections[active_console];

//          if ((c >= KBD_KEY_F1) && (c < KBD_KEY_F1 + CONSOLE_COUNT)) {

            if ((c >= '1') && (c < '1' + CONSOLE_COUNT)) {

                /*FIXME: draw another console content from buffer */

                if (c - '1' == active_console)

                        break;

                active_console = c - '1';

                conn = &connections[active_console];

                ipc_call_async(fb_info.phone, FB_CURSOR_VISIBILITY, 0, NULL, NULL);

                ipc_call_async_2(fb_info.phone, FB_CLEAR, 0, 0, NULL, NULL);

                for (i = 0; i < conn->screenbuffer.size_x; i++)

                    for (j = 0; j < conn->screenbuffer.size_y; j++) {

                        d = get_field_at(&(conn->screenbuffer),i, j)->character;

                        if (d && d != ' ')

                            ipc_call_async_3(fb_info.phone, FB_PUTCHAR, d, j, i, NULL, NULL);

                    }

                ipc_call_async_2(fb_info.phone, FB_CURSOR_GOTO, conn->screenbuffer.position_y, conn->screenbuffer.position_x, NULL, NULL);

                ipc_call_async(fb_info.phone, FB_CURSOR_VISIBILITY, 1, NULL, NULL);

                break;

            }

            /* if client is awaiting key, send it */

            if (conn->keyrequest_counter > 0) {    

                conn->keyrequest_counter--;

                ipc_answer_fast(fifo_pop(conn->keyrequests), 0, c, 0);

                break;

            }

            /*FIXME: else store key to its buffer */

            keybuffer_push(&conn->keybuffer, c);

            break;

        default:

            retval = ENOENT;

        }      

        ipc_answer_fast(callid, retval, 0, 0);

    }

}

/** Default thread for new connections */

void client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    ipc_callid_t callid;

    ipc_call_t call;

    int consnum;

    ipcarg_t arg1;

    if ((consnum = find_free_connection()) == CONSOLE_COUNT) {

        ipc_answer_fast(iid,ELIMIT,0,0);

        return;

    }

    connections[consnum].used = 1;

    connections[consnum].client_phone = IPC_GET_ARG3(call);

    screenbuffer_clear(&(connections[consnum].screenbuffer));

    /* Accept the connection */

    ipc_answer_fast(iid,0,0,0);

    while (1) {

        callid = async_get_call(&call);

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            /* TODO */

            ipc_answer_fast(callid, 0,0,0);

            return;

        case CONSOLE_PUTCHAR:

            write_char(consnum, IPC_GET_ARG1(call));

            break;

        case CONSOLE_CLEAR:

            /* Send message to fb */

            if (consnum == active_console) {

                ipc_call_async_2(fb_info.phone, FB_CLEAR, 0, 0, NULL, NULL);

            }

            screenbuffer_clear(&(connections[consnum].screenbuffer));

            break;

        case CONSOLE_GOTO:

            screenbuffer_goto(&(connections[consnum].screenbuffer), IPC_GET_ARG1(call), IPC_GET_ARG2(call));

            break;

        case CONSOLE_GETCHAR:

            if (keybuffer_empty(&(connections[consnum].keybuffer))) {

                /* buffer is empty -> store request */

                if (connections[consnum].keyrequest_counter < MAX_KEYREQUESTS_BUFFERED) {      

                    fifo_push(connections[consnum].keyrequests, callid);

                    connections[consnum].keyrequest_counter++;

                } else {

                    /* no key available and too many requests => fail */

                    ipc_answer_fast(callid, ELIMIT, 0, 0);

                }

                continue;

            };

            keybuffer_pop(&(connections[consnum].keybuffer), (char *)&arg1);

            break;

        }

        ipc_answer_fast(callid, 0, arg1, 0);

    }

}

int main(int argc, char *argv[])

{

    ipcarg_t phonehash;

    int kbd_phone, fb_phone;

    ipcarg_t retval, arg1 = 0xdead, arg2 = 0xbeef;

    int i;

    async_set_client_connection(client_connection);

    /* Connect to keyboard driver */

    while ((kbd_phone = ipc_connect_me_to(PHONE_NS, SERVICE_KEYBOARD, 0)) < 0) {

        usleep(10000);

    };

    if (ipc_connect_to_me(kbd_phone, SERVICE_CONSOLE, 0, &phonehash) != 0) {

        return -1;

    };

    async_new_connection(phonehash, 0, NULL, keyboard_events);

    /* Connect to framebuffer driver */

    while ((fb_info.phone = ipc_connect_me_to(PHONE_NS, SERVICE_VIDEO, 0)) < 0) {

        usleep(10000);

    }

    ipc_call_sync_2(fb_info.phone, FB_GET_CSIZE, 0, 0, &(fb_info.rows), &(fb_info.cols));

    ipc_call_sync(fb_info.phone, FB_CURSOR_VISIBILITY, 1, NULL);

    /* Init virtual consoles */

    for (i = 0; i < CONSOLE_COUNT; i++) {

        connections[i].used = 0;

        keybuffer_init(&(connections[i].keybuffer));

        connections[i].keyrequests.head = connections[i].keyrequests.tail = 0;

        connections[i].keyrequests.items = MAX_KEYREQUESTS_BUFFERED;

        connections[i].keyrequest_counter = 0;

        if (screenbuffer_init(&(connections[i].screenbuffer), fb_info.cols, fb_info.rows ) == NULL) {

            /*FIXME: handle error */

            return -1;

        }

    }

    if (ipc_connect_to_me(PHONE_NS, SERVICE_CONSOLE, 0, &phonehash) != 0) {

        return -1;

    };

    async_manager();

    return 0;  

}