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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;
}


/**
 * @}
 */