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/*

 * Copyright (c) 2006 Ondrej Palkovsky

 * 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.

 */

/** @defgroup egafb EGA framebuffer

 * @brief   HelenOS EGA framebuffer.

 * @ingroup fbs

 * @{

 */

/** @file

 */

#include <stdlib.h>

#include <unistd.h>

#include <align.h>

#include <async.h>

#include <ipc/ipc.h>

#include <errno.h>

#include <stdio.h>

#include <ddi.h>

#include <sysinfo.h>

#include <as.h>

#include <ipc/fb.h>

#include <ipc/ipc.h>

#include <ipc/ns.h>

#include <ipc/services.h>

#include <libarch/ddi.h>

#include <io/style.h>

#include <io/color.h>

#include <sys/types.h>

#include "ega.h"

#include "../console/screenbuffer.h"

#include "main.h"

#define MAX_SAVED_SCREENS 256

typedef struct saved_screen {

    short *data;

} saved_screen;

saved_screen saved_screens[MAX_SAVED_SCREENS];

#define EGA_IO_BASE ((ioport8_t *) 0x3d4)

#define EGA_IO_SIZE 2

int ega_normal_color = 0x0f;

int ega_inverted_color = 0xf0;

#define NORMAL_COLOR        ega_normal_color

#define INVERTED_COLOR      ega_inverted_color

/* Allow only 1 connection */

static int client_connected = 0;

static unsigned int scr_width;

static unsigned int scr_height;

static uint8_t *scr_addr;

static unsigned int style;

static unsigned attr_to_ega_style(const attrs_t *a);

static uint8_t ega_glyph(wchar_t ch);

static void clrscr(void)

{

    unsigned i;

    for (i = 0; i < scr_width * scr_height; i++) {

        scr_addr[i * 2] = ' ';

        scr_addr[i * 2 + 1] = style;

    }

}

static void cursor_goto(unsigned int col, unsigned int row)

{

    int ega_cursor;

    ega_cursor = col + scr_width * row;

    pio_write_8(EGA_IO_BASE, 0xe);

    pio_write_8(EGA_IO_BASE + 1, (ega_cursor >> 8) & 0xff);

    pio_write_8(EGA_IO_BASE, 0xf);

    pio_write_8(EGA_IO_BASE + 1, ega_cursor & 0xff);

}

static void cursor_disable(void)

{

    uint8_t stat;

    pio_write_8(EGA_IO_BASE, 0xa);

    stat = pio_read_8(EGA_IO_BASE + 1);

    pio_write_8(EGA_IO_BASE, 0xa);

    pio_write_8(EGA_IO_BASE + 1, stat | (1 << 5));

}

static void cursor_enable(void)

{

    uint8_t stat;

    pio_write_8(EGA_IO_BASE, 0xa);

    stat = pio_read_8(EGA_IO_BASE + 1);

    pio_write_8(EGA_IO_BASE, 0xa);

    pio_write_8(EGA_IO_BASE + 1, stat & (~(1 << 5)));

}

static void scroll(int rows)

{

    unsigned i;

    if (rows > 0) {

        memmove(scr_addr, ((char *) scr_addr) + rows * scr_width * 2,

            scr_width * scr_height * 2 - rows * scr_width * 2);

        for (i = 0; i < rows * scr_width; i++)

            (((short *) scr_addr) + scr_width * scr_height - rows *

                scr_width)[i] = ((style << 8) + ' ');

    } else if (rows < 0) {

        memmove(((char *)scr_addr) - rows * scr_width * 2, scr_addr,

            scr_width * scr_height * 2 + rows * scr_width * 2);

        for (i = 0; i < -rows * scr_width; i++)

            ((short *)scr_addr)[i] = ((style << 8 ) + ' ');

    }

}

static void printchar(wchar_t c, unsigned int col, unsigned int row)

{

    scr_addr[(row * scr_width + col) * 2] = ega_glyph(c);

    scr_addr[(row * scr_width + col) * 2 + 1] = style;

    cursor_goto(col + 1, row);

}

/** Draw text data to viewport.

 *

 * @param vport Viewport id

 * @param data  Text data.

 * @param x Leftmost column of the area.

 * @param y Topmost row of the area.

 * @param w Number of rows.

 * @param h Number of columns.

 */

static void draw_text_data(keyfield_t *data, unsigned int x,

    unsigned int y, unsigned int w, unsigned int h)

{

    unsigned int i, j;

    keyfield_t *field;

    uint8_t *dp;

    for (j = 0; j < h; j++) {

        for (i = 0; i < w; i++) {

            field = &data[j * w + i];

            dp = &scr_addr[2 * ((y + j) * scr_width + (x + i))];

            dp[0] = ega_glyph(field->character);

            dp[1] = attr_to_ega_style(&field->attrs);

        }

    }

}

static int save_screen(void)

{

    int i;

    for (i = 0; (i < MAX_SAVED_SCREENS) && (saved_screens[i].data); i++)

        ;

    if (i == MAX_SAVED_SCREENS)

        return EINVAL;

    if (!(saved_screens[i].data = malloc(2 * scr_width * scr_height)))

        return ENOMEM;

    memcpy(saved_screens[i].data, scr_addr, 2 * scr_width * scr_height);

    return i;

}

static int print_screen(int i)

{

    if (saved_screens[i].data)

        memcpy(scr_addr, saved_screens[i].data, 2 * scr_width *

            scr_height);

    else

        return EINVAL;

    return i;

}

static int style_to_ega_style(int style)

{

    unsigned int ega_style;

    switch (style) {

    case STYLE_NORMAL:

        ega_style = INVERTED_COLOR;

        break;

    case STYLE_EMPHASIS:

        ega_style = INVERTED_COLOR | 4;

        break;

    default:

        return INVERTED_COLOR;

    }

    return ega_style;

}

static unsigned int color_to_ega_style(int fg_color, int bg_color, int attr)

{

    unsigned int style;

    style = (fg_color & 7) | ((bg_color & 7) << 4);

    if (attr & CATTR_BRIGHT)

        style = style | 0x08;

    return style;

}

static unsigned int rgb_to_ega_style(uint32_t fg, uint32_t bg)

{

    return (fg > bg) ? NORMAL_COLOR : INVERTED_COLOR;

}

static unsigned attr_to_ega_style(const attrs_t *a)

{

    switch (a->t) {

    case at_style:

        return style_to_ega_style(a->a.s.style);

    case at_rgb:

        return rgb_to_ega_style(a->a.r.fg_color, a->a.r.bg_color);

    case at_idx:

        return color_to_ega_style(a->a.i.fg_color,

            a->a.i.bg_color, a->a.i.flags);

    default:

        return INVERTED_COLOR;

    }

}

static uint8_t ega_glyph(wchar_t ch)

{

    if (ch >= 0 && ch < 128)

        return ch;

    return '?';

}

static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    int retval;

    ipc_callid_t callid;

    ipc_call_t call;

    wchar_t c;

    unsigned int row, col, w, h;

    int bg_color, fg_color, attr;

    uint32_t bg_rgb, fg_rgb;

    keyfield_t *interbuf = NULL;

    size_t intersize = 0;

    int i;

    if (client_connected) {

        ipc_answer_0(iid, ELIMIT);

        return;

    }

    client_connected = 1;

    ipc_answer_0(iid, EOK); /* Accept connection */

    while (1) {

        callid = async_get_call(&call);

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            client_connected = 0;

            ipc_answer_0(callid, EOK);

            return; /* Exit thread */

        case IPC_M_SHARE_OUT:

            /* We accept one area for data interchange */

            intersize = IPC_GET_ARG2(call);

            if (intersize >= scr_width * scr_height *

                sizeof(*interbuf)) {

                receive_comm_area(callid, &call,

                    (void *) &interbuf);

                continue;

            }

            retval = EINVAL;

            break;

        case FB_DRAW_TEXT_DATA:

            col = IPC_GET_ARG1(call);

            row = IPC_GET_ARG2(call);

            w = IPC_GET_ARG3(call);

            h = IPC_GET_ARG4(call);

            if (!interbuf) {

                retval = EINVAL;

                break;

            }

            if (col + w > scr_width || row + h > scr_height) {

                retval = EINVAL;

                break;

            }

            draw_text_data(interbuf, col, row, w, h);

            retval = 0;

            break;

        case FB_GET_CSIZE:

            ipc_answer_2(callid, EOK, scr_width, scr_height);

            continue;

        case FB_GET_COLOR_CAP:

            ipc_answer_1(callid, EOK, FB_CCAP_INDEXED);

            continue;

        case FB_CLEAR:

            clrscr();

            retval = 0;

            break;

        case FB_PUTCHAR:

            c = IPC_GET_ARG1(call);

            col = IPC_GET_ARG2(call);

            row = IPC_GET_ARG3(call);

            if (col >= scr_width || row >= scr_height) {

                retval = EINVAL;

                break;

            }

            printchar(c, col, row);

            retval = 0;

            break;

        case FB_CURSOR_GOTO:

            col = IPC_GET_ARG1(call);

            row = IPC_GET_ARG2(call);

            if (row >= scr_height || col >= scr_width) {

                retval = EINVAL;

                break;

            }

            cursor_goto(col, row);

            retval = 0;

            break;

        case FB_SCROLL:

            i = IPC_GET_ARG1(call);

            if (i > (int) scr_height || i < -((int) scr_height)) {

                retval = EINVAL;

                break;

            }

            scroll(i);

            retval = 0;

            break;

        case FB_CURSOR_VISIBILITY:

            if (IPC_GET_ARG1(call))

                cursor_enable();

            else

                cursor_disable();

            retval = 0;

            break;

        case FB_SET_STYLE:

            style = style_to_ega_style(IPC_GET_ARG1(call));

            retval = 0;

            break;

        case FB_SET_COLOR:

            fg_color = IPC_GET_ARG1(call);

            bg_color = IPC_GET_ARG2(call);

            attr = IPC_GET_ARG3(call);

            style = color_to_ega_style(fg_color, bg_color, attr);

            retval = 0;

            break;

        case FB_SET_RGB_COLOR:

            fg_rgb = IPC_GET_ARG1(call);

            bg_rgb = IPC_GET_ARG2(call);

            style = rgb_to_ega_style(fg_rgb, bg_rgb);

            retval = 0;

            break;

        case FB_VP_DRAW_PIXMAP:

            i = IPC_GET_ARG2(call);

            retval = print_screen(i);

            break;

        case FB_VP2PIXMAP:

            retval = save_screen();

            break;

        case FB_DROP_PIXMAP:

            i = IPC_GET_ARG1(call);

            if (i >= MAX_SAVED_SCREENS) {

                retval = EINVAL;

                break;

            }

            if (saved_screens[i].data) {

                free(saved_screens[i].data);

                saved_screens[i].data = NULL;

            }

            retval = 0;

            break;

        case FB_SCREEN_YIELD:

        case FB_SCREEN_RECLAIM:

            retval = EOK;

            break;

        default:

            retval = EINVAL;

        }

        ipc_answer_0(callid, retval);

    }

}

int ega_init(void)

{

    void *ega_ph_addr;

    size_t sz;

    ega_ph_addr = (void *) sysinfo_value("fb.address.physical");

    scr_width = sysinfo_value("fb.width");

    scr_height = sysinfo_value("fb.height");

    if (sysinfo_value("fb.blinking")) {

        ega_normal_color &= 0x77;

        ega_inverted_color &= 0x77;

    }

    style = NORMAL_COLOR;

    iospace_enable(task_get_id(), (void *) EGA_IO_BASE, 2);

    sz = scr_width * scr_height * 2;

    scr_addr = as_get_mappable_page(sz);

    if (physmem_map(ega_ph_addr, scr_addr, ALIGN_UP(sz, PAGE_SIZE) >>

        PAGE_WIDTH, AS_AREA_READ | AS_AREA_WRITE) != 0)

        return -1;

    async_set_client_connection(ega_client_connection);

    return 0;

}

/**

 * @}

 */