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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;
    
    if (console == active_console)  
        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;
        }
    }
    
    ipc_call_async_2(fb_info.phone, FB_CURSOR_GOTO, 0, 0, NULL, NULL); 

    if (ipc_connect_to_me(PHONE_NS, SERVICE_CONSOLE, 0, &phonehash) != 0) {
        return -1;
    };
    
    async_manager();

    return 0;   
}