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/*

 * Copyright (C) 2006 Jakub Vana

 * 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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <ddi.h>

#include <task.h>

#include <sysinfo.h>

#include <align.h>

#include <as.h>

#include <ipc/fb.h>

#include <ipc/ipc.h>

#include <ipc/ns.h>

#include <ipc/services.h>

#include <kernel/errno.h>

#include <async.h>

#include "font-8x16.h"

#include "helenos.xbm"

#include "fb.h"

#define EFB (-1)

#define DEFAULT_BGCOLOR     0x000080

#define DEFAULT_FGCOLOR     0xffff00

#define DEFAULT_LOGOCOLOR   0x0000ff

#define MAIN_BGCOLOR        0x404000

#define MAIN_FGCOLOR        0x000000

#define MAIN_LOGOCOLOR  0x404000

#define SPACING (2)

#define H_NO_VFBS 3

#define V_NO_VFBS 3

static void fb_putchar(int item,char ch);

int create_window(int item,unsigned int x, unsigned int y,unsigned int x_size, unsigned int y_size,

    unsigned int BGCOLOR,unsigned int FGCOLOR,unsigned int LOGOCOLOR);

void fb_init(int item,__address addr, unsigned int x, unsigned int y, unsigned int bpp, unsigned int scan,

    unsigned int BGCOLOR,unsigned int FGCOLOR,unsigned int LOGOCOLOR);

unsigned int mod_col(unsigned int col,int mod);

static int init_fb(void)

{

    __address fb_ph_addr;

    unsigned int fb_width;

    unsigned int fb_height;

    unsigned int fb_bpp;

    unsigned int fb_scanline;

    __address fb_addr;

    int a=0;

    int i,j,k;

    int w;

    char text[]="HelenOS Framebuffer driver\non Virtual Framebuffer\nVFB ";

    fb_ph_addr=sysinfo_value("fb.address.physical");

    fb_width=sysinfo_value("fb.width");

    fb_height=sysinfo_value("fb.height");

    fb_bpp=sysinfo_value("fb.bpp");

    fb_scanline=sysinfo_value("fb.scanline");

    fb_addr=ALIGN_UP(((__address)set_maxheapsize(USER_ADDRESS_SPACE_SIZE_ARCH>>1)),PAGE_SIZE);

    map_physmem(task_get_id(),(void *)((__address)fb_ph_addr),(void *)fb_addr,

            (fb_scanline*fb_height+PAGE_SIZE-1)>>PAGE_WIDTH,

            AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE);

    fb_init(0,fb_addr, fb_width, fb_height, fb_bpp, fb_scanline,

        MAIN_BGCOLOR,MAIN_FGCOLOR,MAIN_LOGOCOLOR);

    fb_putchar(0,'\n');

    fb_putchar(0,' ');

    for(i=0;i<H_NO_VFBS;i++)

        for(j=0;j<V_NO_VFBS;j++) {

            w = create_window(0,(fb_width/H_NO_VFBS)*i+SPACING,

                      (fb_height/V_NO_VFBS)*j+SPACING,(fb_width/H_NO_VFBS)-2*SPACING ,

                      (fb_height/V_NO_VFBS)-2*SPACING,mod_col(DEFAULT_BGCOLOR,/*i+j*H_NO_VFBS*/0),

                      mod_col(DEFAULT_FGCOLOR,/*i+j*H_NO_VFBS*/0),

                      mod_col(DEFAULT_LOGOCOLOR,/*i+j*H_NO_VFBS)*/0));

            if( w== EFB)

                return -1;

            for(k=0;text[k];k++)

                fb_putchar(w,text[k]);

            fb_putchar(w,w+'0');

            fb_putchar(w,'\n');

        }

    return 0;

}

int vfb_no = 1;

void client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    ipc_callid_t callid;

    ipc_call_t call;

    int vfb = vfb_no++;

    if (vfb > VFB_CONNECTIONS) {

        ipc_answer_fast(iid, ELIMIT, 0,0);

        return;

    }

    ipc_answer_fast(iid, 0, 0, 0);

    while (1) {

        callid = async_get_call(&call);

        switch (IPC_GET_METHOD(call)) {

        case IPC_M_PHONE_HUNGUP:

            ipc_answer_fast(callid,0,0,0);

            return; /* Exit thread */

        case FB_PUTCHAR:

            fb_putchar(vfb,IPC_GET_ARG2(call));

            ipc_answer_fast(callid,0,0,0);

            break;

/*     

 *      case FB_CLEAR:

            ipc_answer_fast(callid,0,0,0);

            fb_putchar(vfb,IPC_GET_ARG2(call));

            break;

 *      case FB_GOTO:

            ipc_answer_fast(callid,0,0,0);

            fb_putchar(vfb,IPC_GET_ARG2(call));

            break;

*/

        default:

            ipc_answer_fast(callid,ENOENT,0,0);

        }

    }

}

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

{

    ipc_call_t call;

    ipc_callid_t callid;

    char connected = 0;

    int res;

    int c;

    ipcarg_t phonead;

    ipcarg_t retval, arg1, arg2;

    if(!sysinfo_value("fb"))

        return -1;

    if ((res = ipc_connect_to_me(PHONE_NS, SERVICE_VIDEO, 0, &phonead)) != 0)

        return -1;

    if (init_fb() != 0)

        return -1;

    async_manager();

    /* Never reached */

    return 0;

}

#define GRAPHICS_ITEMS 1024

/***************************************************************/

/* Pixel specific fuctions */

typedef void (*putpixel_fn_t)(int item,unsigned int x, unsigned int y, int color);

typedef int (*getpixel_fn_t)(int item,unsigned int x, unsigned int y);

typedef struct framebuffer_descriptor

{

    __u8 *fbaddress ;

    unsigned int xres ;

    unsigned int yres ;

    unsigned int scanline ;

    unsigned int pixelbytes ;

    unsigned int position ;

    unsigned int columns ;

    unsigned int rows ;

    unsigned int BGCOLOR;

    unsigned int FGCOLOR;

    unsigned int LOGOCOLOR;

    putpixel_fn_t putpixel;

    getpixel_fn_t getpixel;

}framebuffer_descriptor_t;

void * graphics_items[GRAPHICS_ITEMS+1]={NULL};

#define FB(__a__,__b__) (((framebuffer_descriptor_t*)(graphics_items[__a__]))->__b__)

#define COL_WIDTH   8

#define ROW_BYTES   (FB(item,scanline) * FONT_SCANLINES)

#define RED(x, bits)    ((x >> (16 + 8 - bits)) & ((1 << bits) - 1))

#define GREEN(x, bits)  ((x >> (8 + 8 - bits)) & ((1 << bits) - 1))

#define BLUE(x, bits)   ((x >> (8 - bits)) & ((1 << bits) - 1))

#define POINTPOS(x, y)  (y * FB(item,scanline) + x * FB(item,pixelbytes))

/** Put pixel - 24-bit depth, 1 free byte */

static void putpixel_4byte(int item,unsigned int x, unsigned int y, int color)

{

    *((__u32 *)(FB(item,fbaddress) + POINTPOS(x, y))) = color;

}

/** Return pixel color - 24-bit depth, 1 free byte */

static int getpixel_4byte(int item,unsigned int x, unsigned int y)

{

    return *((__u32 *)(FB(item,fbaddress) + POINTPOS(x, y))) & 0xffffff;

}

/** Put pixel - 24-bit depth */

static void putpixel_3byte(int item,unsigned int x, unsigned int y, int color)

{

    unsigned int startbyte = POINTPOS(x, y);

#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))

    FB(item,fbaddress)[startbyte] = RED(color, 8);

    FB(item,fbaddress)[startbyte + 1] = GREEN(color, 8);

    FB(item,fbaddress)[startbyte + 2] = BLUE(color, 8);

#else

    FB(item,fbaddress)[startbyte + 2] = RED(color, 8);

    FB(item,fbaddress)[startbyte + 1] = GREEN(color, 8);

    FB(item,fbaddress)[startbyte + 0] = BLUE(color, 8);

#endif

}

/** Return pixel color - 24-bit depth */

static int getpixel_3byte(int item,unsigned int x, unsigned int y)

{

    unsigned int startbyte = POINTPOS(x, y);

#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))

    return FB(item,fbaddress)[startbyte] << 16 | FB(item,fbaddress)[startbyte + 1] << 8 | FB(item,fbaddress)[startbyte + 2];

#else

    return FB(item,fbaddress)[startbyte + 2] << 16 | FB(item,fbaddress)[startbyte + 1] << 8 | FB(item,fbaddress)[startbyte + 0];

#endif

}

/** Put pixel - 16-bit depth (5:6:5) */

static void putpixel_2byte(int item,unsigned int x, unsigned int y, int color)

{

    /* 5-bit, 6-bits, 5-bits */

    *((__u16 *)(FB(item,fbaddress) + POINTPOS(x, y))) = RED(color, 5) << 11 | GREEN(color, 6) << 5 | BLUE(color, 5);

}

/** Return pixel color - 16-bit depth (5:6:5) */

static int getpixel_2byte(int item,unsigned int x, unsigned int y)

{

    int color = *((__u16 *)(FB(item,fbaddress) + POINTPOS(x, y)));

    return (((color >> 11) & 0x1f) << (16 + 3)) | (((color >> 5) & 0x3f) << (8 + 2)) | ((color & 0x1f) << 3);

}

/** Put pixel - 8-bit depth (3:2:3) */

static void putpixel_1byte(int item,unsigned int x, unsigned int y, int color)

{

    FB(item,fbaddress)[POINTPOS(x, y)] = RED(color, 3) << 5 | GREEN(color, 2) << 3 | BLUE(color, 3);

}

/** Return pixel color - 8-bit depth (3:2:3) */

static int getpixel_1byte(int item,unsigned int x, unsigned int y)

{

    int color = FB(item,fbaddress)[POINTPOS(x, y)];

    return (((color >> 5) & 0x7) << (16 + 5)) | (((color >> 3) & 0x3) << (8 + 6)) | ((color & 0x7) << 5);

}

/** Fill line with color BGCOLOR */

static void clear_line(int item,unsigned int y)

{

    unsigned int x;

    for (x = 0; x < FB(item,xres); x++)

        FB(item,putpixel)(item,x, y, FB(item,BGCOLOR));

}

/** Fill screen with background color */

static void clear_screen(int item)

{

    unsigned int y;

    for (y = 0; y < FB(item,yres); y++)

    {

        clear_line(item,y);

    }  

}

/** Scroll screen one row up */

static void scroll_screen(int item)

{

    unsigned int i;

    unsigned int j;

    for(j=0;j<FB(item,yres)-FONT_SCANLINES;j++)

        memcpy((void *) FB(item,fbaddress)+j*FB(item,scanline),

            (void *) &FB(item,fbaddress)[ROW_BYTES+j*FB(item,scanline)], FB(item,pixelbytes)*FB(item,xres));

    //memcpy((void *) FB(item,fbaddress), (void *) &FB(item,fbaddress)[ROW_BYTES], FB(item,scanline) * FB(item,yres) - ROW_BYTES);

    /* Clear last row */

    for (i = 0; i < FONT_SCANLINES; i++)

        clear_line(item,(FB(item,rows) - 1) * FONT_SCANLINES + i);

}

static void invert_pixel(int item,unsigned int x, unsigned int y)

{

    FB(item,putpixel)(item, x, y, ~FB(item,getpixel)(item, x, y));

}

/** Draw one line of glyph at a given position */

static void draw_glyph_line(int item,unsigned int glline, unsigned int x, unsigned int y)

{

    unsigned int i;

    for (i = 0; i < 8; i++)

        if (glline & (1 << (7 - i))) {

            FB(item,putpixel)(item,x + i, y, FB(item,FGCOLOR));

        } else

            FB(item,putpixel)(item,x + i, y, FB(item,BGCOLOR));

}

/***************************************************************/

/* Character-console functions */

/** Draw character at given position */

static void draw_glyph(int item,__u8 glyph, unsigned int col, unsigned int row)

{

    unsigned int y;

    for (y = 0; y < FONT_SCANLINES; y++)

        draw_glyph_line(item ,fb_font[glyph * FONT_SCANLINES + y], col * COL_WIDTH, row * FONT_SCANLINES + y);

}

/** Invert character at given position */

static void invert_char(int item,unsigned int col, unsigned int row)

{

    unsigned int x;

    unsigned int y;

    for (x = 0; x < COL_WIDTH; x++)

        for (y = 0; y < FONT_SCANLINES; y++)

            invert_pixel(item,col * COL_WIDTH + x, row * FONT_SCANLINES + y);

}

/** Draw character at default position */

static void draw_char(int item,char chr)

{

    draw_glyph(item ,chr, FB(item,position) % FB(item,columns), FB(item,position) / FB(item,columns));

}

static void draw_logo(int item,unsigned int startx, unsigned int starty)

{

    unsigned int x;

    unsigned int y;

    unsigned int byte;

    unsigned int rowbytes;

    rowbytes = (helenos_width - 1) / 8 + 1;

    for (y = 0; y < helenos_height; y++)

        for (x = 0; x < helenos_width; x++) {

            byte = helenos_bits[rowbytes * y + x / 8];

            byte >>= x % 8;

            if (byte & 1)

                FB(item,putpixel)(item,startx + x, starty + y, FB(item,LOGOCOLOR));

        }

}

/***************************************************************/

/* Stdout specific functions */

static void invert_cursor(int item)

{

    invert_char(item,FB(item,position) % FB(item,columns), FB(item,position) / FB(item,columns));

}

/** Print character to screen

 *

 *  Emulate basic terminal commands

 */

static void fb_putchar(int item,char ch)

{

    switch (ch) {

        case '\n':

            invert_cursor(item);

            FB(item,position) += FB(item,columns);

            FB(item,position) -= FB(item,position) % FB(item,columns);

            break;

        case '\r':

            invert_cursor(item);

            FB(item,position) -= FB(item,position) % FB(item,columns);

            break;

        case '\b':

            invert_cursor(item);

            if (FB(item,position) % FB(item,columns))

                FB(item,position)--;

            break;

        case '\t':

            invert_cursor(item);

            do {

                draw_char(item,' ');

                FB(item,position)++;

            } while (FB(item,position) % 8);

            break;

        default:

            draw_char(item,ch);

            FB(item,position)++;

    }

    if (FB(item,position) >= FB(item,columns) * FB(item,rows)) {

        FB(item,position) -= FB(item,columns);

        scroll_screen(item);

    }

    invert_cursor(item);

}

/** Initialize framebuffer as a chardev output device

 *

 * @param addr Address of theframebuffer

 * @param x    Screen width in pixels

 * @param y    Screen height in pixels

 * @param bpp  Bits per pixel (8, 16, 24, 32)

 * @param scan Bytes per one scanline

 *

 */

void fb_init(int item,__address addr, unsigned int x, unsigned int y, unsigned int bpp, unsigned int scan,

    unsigned int BGCOLOR,unsigned int FGCOLOR,unsigned int LOGOCOLOR)

{

    if( (graphics_items[item]=malloc(sizeof(framebuffer_descriptor_t))) ==NULL)

    {

        return;

    }

    switch (bpp) {

        case 8:

            FB(item,putpixel) = putpixel_1byte;

            FB(item,getpixel) = getpixel_1byte;

            FB(item,pixelbytes) = 1;

            break;

        case 16:

            FB(item,putpixel) = putpixel_2byte;

            FB(item,getpixel) = getpixel_2byte;

            FB(item,pixelbytes) = 2;

            break;

        case 24:

            FB(item,putpixel) = putpixel_3byte;

            FB(item,getpixel) = getpixel_3byte;

            FB(item,pixelbytes) = 3;

            break;

        case 32:

            FB(item,putpixel) = putpixel_4byte;

            FB(item,getpixel) = getpixel_4byte;

            FB(item,pixelbytes) = 4;

            break;

    }

    FB(item,fbaddress) = (unsigned char *) addr;

    FB(item,xres) = x;

    FB(item,yres) = y;

    FB(item,scanline) = scan;

    FB(item,rows) = y / FONT_SCANLINES;

    FB(item,columns) = x / COL_WIDTH;

    FB(item,BGCOLOR)=BGCOLOR;

    FB(item,FGCOLOR)=FGCOLOR;

    FB(item,LOGOCOLOR)=LOGOCOLOR;

    clear_screen(item);

    draw_logo(item,FB(item,xres) - helenos_width, 0);

    invert_cursor(item);

}

static int get_free_item()

{

    int item;

    for(item=0;graphics_items[item]!=NULL;item++);

    return (item==GRAPHICS_ITEMS)?EFB:item;

}

unsigned int mod_col(unsigned int col,int mod)

{

    if(mod & 1) col^=0xff;

    if(mod & 2) col^=0xff00;

    if(mod & 4) col^=0xff0000;

    return col;

}

int create_window(int item,unsigned int x, unsigned int y,unsigned int x_size, unsigned int y_size,

    unsigned int BGCOLOR,unsigned int FGCOLOR,unsigned int LOGOCOLOR)

{

    int item_new;

    if(EFB==(item_new=get_free_item()))return EFB;

    if( (graphics_items[item_new]=malloc(sizeof(framebuffer_descriptor_t))) == NULL)

    {

        return EFB;

    }

    FB(item_new,putpixel) = FB(item,putpixel);

    FB(item_new,getpixel) = FB(item,getpixel);

    FB(item_new,pixelbytes) = FB(item,pixelbytes);

    FB(item_new,fbaddress) = FB(item,fbaddress) + POINTPOS(x, y) ;

    FB(item_new,xres) = x_size;

    FB(item_new,yres) = y_size;

    FB(item_new,scanline) =  FB(item,scanline);

    FB(item_new,rows) = y_size / FONT_SCANLINES;

    FB(item_new,columns) = x_size / COL_WIDTH;

    FB(item_new,BGCOLOR)=BGCOLOR;

    FB(item_new,FGCOLOR)=FGCOLOR;

    FB(item_new,LOGOCOLOR)=LOGOCOLOR;

    clear_screen(item_new);

    draw_logo(item_new,FB(item_new,xres) - helenos_width, 0);

    invert_cursor(item_new);

    return item_new;

}