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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>

#include <sys/mman.h>

#include "gcons.h"

#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "CONSOLE"

/** Index of currently used virtual console.

 */

int active_console = 0;

/** Information about framebuffer

 */

struct {

    int phone;      /**< Framebuffer phone */

    ipcarg_t rows;      /**< Framebuffer rows */

    ipcarg_t cols;      /**< Framebuffer columns */

} fb_info;

typedef struct {

    keybuffer_t keybuffer;      /**< Buffer for incoming keys. */

    FIFO_CREATE_STATIC(keyrequests, ipc_callid_t , MAX_KEYREQUESTS_BUFFERED);   /**< Buffer for unsatisfied request for keys. */

    int keyrequest_counter;     /**< Number of requests in buffer. */

    int client_phone;       /**< Phone to connected client. */

    int used;           /**< 1 if this virtual console is connected to some client.*/

    screenbuffer_t screenbuffer;    /**< Screenbuffer for saving screen contents and related settings. */

} connection_t;

static connection_t connections[CONSOLE_COUNT]; /**< Array of data for virtual consoles */

static keyfield_t *interbuffer = NULL;          /**< Pointer to memory shared with framebufer used for faster virt. console switching */

static int kernel_pixmap = -1;      /**< Number of fb pixmap, where kernel console is stored */

/** Find unused virtual console.

 *

 */

static int find_free_connection(void)

{

    int i = 0;

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

        if (!connections[i].used)

            return i;

    }

    return -1;

}

static void clrscr(void)

{

    nsend_call(fb_info.phone, FB_CLEAR, 0);

}

static void curs_visibility(int v)

{

    send_call(fb_info.phone, FB_CURSOR_VISIBILITY, v);

}

static void curs_goto(int row, int col)

{

    nsend_call_2(fb_info.phone, FB_CURSOR_GOTO, row, col);

}

static void set_style(style_t *style)

{

    nsend_call_2(fb_info.phone, FB_SET_STYLE, style->fg_color, style->bg_color);

}

static void set_style_col(int fgcolor, int bgcolor)

{

    nsend_call_2(fb_info.phone, FB_SET_STYLE, fgcolor, bgcolor);

}

static void prtchr(char c, int row, int col)

{

    nsend_call_3(fb_info.phone, FB_PUTCHAR, c, row, col);

}

/** 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)

                prtchr(' ', scr->position_y, scr->position_x);

            screenbuffer_putchar(scr, ' ');

            break;

        default:   

            if (console == active_console)

                prtchr(key, scr->position_y, scr->position_x);

            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++);

        if (console == active_console)

            nsend_call(fb_info.phone, FB_SCROLL, 1);

    }

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

    if (console == active_console)

        curs_goto(scr->position_y, scr->position_x);

}

/** Save current screen to pixmap, draw old pixmap

 *

 * @param oldpixmap Old pixmap

 * @return ID of pixmap of current screen

 */

static int switch_screens(int oldpixmap)

{

    int newpmap;

    /* Save screen */

    newpmap = sync_send(fb_info.phone, FB_VP2PIXMAP, 0, NULL);

    if (newpmap < 0)

        return -1;

    if (oldpixmap != -1) {

        /* Show old screen */

        nsend_call_2(fb_info.phone, FB_VP_DRAW_PIXMAP, 0, oldpixmap);

        /* Drop old pixmap */

        nsend_call(fb_info.phone, FB_DROP_PIXMAP, oldpixmap);

    }

    return newpmap;

}

/** Switch to new console */

static void change_console(int newcons)

{

    connection_t *conn;

    static int console_pixmap = -1;

    int i, j;

    keyfield_t *field;

    style_t *style;

    char c;

    if (newcons == active_console)

        return;

    if (newcons == KERNEL_CONSOLE) {

        if (active_console == KERNEL_CONSOLE)

            return;

        active_console = KERNEL_CONSOLE;

        curs_visibility(0);

        if (kernel_pixmap == -1) {

            /* store/restore unsupported */

            set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);

            clrscr();

        } else {

            gcons_in_kernel();

            console_pixmap = switch_screens(kernel_pixmap);

            kernel_pixmap = -1;

        }

        __SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE);

        return;

    }

    if (console_pixmap != -1) {

        kernel_pixmap = switch_screens(console_pixmap);

        console_pixmap = -1;

    }

    active_console = newcons;

    gcons_change_console(newcons);

    conn = &connections[active_console];

    set_style(&conn->screenbuffer.style);

    curs_goto(conn->screenbuffer.position_y, conn->screenbuffer.position_x);

    curs_visibility(0);

    if (interbuffer) {

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

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

                interbuffer[i + j*conn->screenbuffer.size_x] = *get_field_at(&(conn->screenbuffer),i, j);

        /* This call can preempt, but we are already at the end */

        j = sync_send_2(fb_info.phone, FB_DRAW_TEXT_DATA, 0, 0, NULL, NULL);       

    };

    if ((!interbuffer) || (j != 0)){

        set_style(&conn->screenbuffer.style);

        clrscr();

        style = &conn->screenbuffer.style;

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

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

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

                if (!style_same(*style, field->style))

                    set_style(&field->style);

                style = &field->style;

                if ((field->character == ' ') && (style_same(field->style, conn->screenbuffer.style)))

                    continue;

                prtchr(field->character, j, i);

            }

    }

    curs_visibility(conn->screenbuffer.is_cursor_visible);

}

/** 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 c;

    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 >= 0x101) && (c < 0x101 + CONSOLE_COUNT)) {

                if (c == 0x112)

                    change_console(KERNEL_CONSOLE);

                else

                    change_console(c - 0x101);

                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 */

static void client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    ipc_callid_t callid;

    ipc_call_t call;

    int consnum;

    ipcarg_t arg1, arg2;

    connection_t *conn;

    if ((consnum = find_free_connection()) == -1) {

        ipc_answer_fast(iid,ELIMIT,0,0);

        return;

    }

    conn = &connections[consnum];

    gcons_notify_connect(consnum);

    conn->used = 1;

    conn->client_phone = IPC_GET_ARG3(call);

    screenbuffer_clear(&conn->screenbuffer);

    /* Accept the connection */

    ipc_answer_fast(iid,0,0,0);

    while (1) {

        callid = async_get_call(&call);

        arg1 = arg2 = 0;

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            gcons_notify_disconnect(consnum);

            /* Answer all pending requests */

            while (conn->keyrequest_counter > 0) {     

                conn->keyrequest_counter--;

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

                break;

            }

            /* Commit hangup */

            ipc_answer_fast(callid, 0,0,0);

            return;

        case CONSOLE_PUTCHAR:

            write_char(consnum, IPC_GET_ARG1(call));

            gcons_notify_char(consnum);

            break;

        case CONSOLE_CLEAR:

            /* Send message to fb */

            if (consnum == active_console) {

                send_call(fb_info.phone, FB_CLEAR, 0);

            }

            screenbuffer_clear(&conn->screenbuffer);

            break;

        case CONSOLE_GOTO:

            screenbuffer_goto(&conn->screenbuffer, IPC_GET_ARG2(call), IPC_GET_ARG1(call));

            if (consnum == active_console)

                curs_goto(IPC_GET_ARG1(call),IPC_GET_ARG2(call));

            break;

        case CONSOLE_GETSIZE:

            arg1 = fb_info.rows;

            arg2 = fb_info.cols;

            break;

        case CONSOLE_FLUSH:

            sync_send_2(fb_info.phone, FB_FLUSH, 0, 0, NULL, NULL);    

            break;

        case CONSOLE_SET_STYLE:

            arg1 = IPC_GET_ARG1(call);

            arg2 = IPC_GET_ARG2(call);

            screenbuffer_set_style(&conn->screenbuffer,arg1, arg2);

            if (consnum == active_console)

                set_style_col(arg1, arg2);

            break;

        case CONSOLE_CURSOR_VISIBILITY:

            arg1 = IPC_GET_ARG1(call);

            conn->screenbuffer.is_cursor_visible = arg1;

            if (consnum == active_console)

                curs_visibility(arg1);

            break;

        case CONSOLE_GETCHAR:

            if (keybuffer_empty(&conn->keybuffer)) {

                /* buffer is empty -> store request */

                if (conn->keyrequest_counter < MAX_KEYREQUESTS_BUFFERED) {     

                    fifo_push(conn->keyrequests, callid);

                    conn->keyrequest_counter++;

                } else {

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

                    ipc_answer_fast(callid, ELIMIT, 0, 0);

                }

                continue;

            };

            keybuffer_pop(&conn->keybuffer, (int *)&arg1);

            break;

        }

        ipc_answer_fast(callid, 0, arg1, arg2);

    }

}

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;

    };

    /* Connect to framebuffer driver */

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

        usleep(10000);

    }

    /* Save old kernel screen */

    kernel_pixmap = switch_screens(-1);

    /* Initialize gcons */

    gcons_init(fb_info.phone);

    /* Synchronize, the gcons can have something in queue */

    sync_send(fb_info.phone, FB_FLUSH, 0, NULL);

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

    set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);

    clrscr();

    /* 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;

        }

    }

    connections[KERNEL_CONSOLE].used = 1;

    if ((interbuffer = mmap(NULL, sizeof(keyfield_t) * fb_info.cols * fb_info.rows , PROTO_READ|PROTO_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, 0 ,0 )) != NULL) {

        if (ipc_call_sync_3(fb_info.phone, IPC_M_AS_AREA_SEND, (ipcarg_t)interbuffer, 0, AS_AREA_READ, NULL, NULL, NULL) != 0) {

            munmap(interbuffer, sizeof(keyfield_t) * fb_info.cols * fb_info.rows);

            interbuffer = NULL;

        }

    }

    async_new_connection(phonehash, 0, NULL, keyboard_events);

    curs_goto(0,0);

    curs_visibility(connections[active_console].screenbuffer.is_cursor_visible);

    /* Register at NS */

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

        return -1;

    };

    async_manager();

    return 0;  

}