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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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ddi.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"
#include "main.h"
#include "../console/screenbuffer.h"

#define DEFAULT_BGCOLOR                0x000080
#define DEFAULT_FGCOLOR                0xffff00

/***************************************************************/
/* Pixel specific fuctions */

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

struct {
    __u8 *fbaddress ;

    unsigned int xres ;
    unsigned int yres ;
    unsigned int scanline ;
    unsigned int pixelbytes ;

    putpixel_fn_t putpixel;
    getpixel_fn_t getpixel;
} screen;

typedef struct {
    int initialized;
    unsigned int x, y;
    unsigned int width, height;

    /* Text support in window */
    unsigned int rows, cols;
    /* Style for text printing */
    int bgcolor, fgcolor;
    /* Auto-cursor position */
    int cursor_active, cur_col, cur_row;
    int cursor_shown;
} viewport_t;

#define MAX_VIEWPORTS 128
static viewport_t viewports[128];

/* Allow only 1 connection */
static int client_connected = 0;

#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 COL_WIDTH   8
#define ROW_BYTES   (screen.scanline * FONT_SCANLINES)

#define POINTPOS(x, y)  ((y) * screen.scanline + (x) * screen.pixelbytes)

/** Put pixel - 24-bit depth, 1 free byte */
static void putpixel_4byte(unsigned int x, unsigned int y, int color)
{
    *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) = color;
}

/** Return pixel color - 24-bit depth, 1 free byte */
static int getpixel_4byte(unsigned int x, unsigned int y)
{
    return *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) & 0xffffff;
}

/** Put pixel - 24-bit depth */
static void putpixel_3byte(unsigned int x, unsigned int y, int color)
{
    unsigned int startbyte = POINTPOS(x, y);

#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
    screen.fbaddress[startbyte] = RED(color, 8);
    screen.fbaddress[startbyte + 1] = GREEN(color, 8);
    screen.fbaddress[startbyte + 2] = BLUE(color, 8);
#else
    screen.fbaddress[startbyte + 2] = RED(color, 8);
    screen.fbaddress[startbyte + 1] = GREEN(color, 8);
    screen.fbaddress[startbyte + 0] = BLUE(color, 8);
#endif

}

/** Return pixel color - 24-bit depth */
static int getpixel_3byte(unsigned int x, unsigned int y)
{
    unsigned int startbyte = POINTPOS(x, y);



#if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
    return screen.fbaddress[startbyte] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 2];
#else
    return screen.fbaddress[startbyte + 2] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 0];
#endif
                                

}

/** Put pixel - 16-bit depth (5:6:5) */
static void putpixel_2byte(unsigned int x, unsigned int y, int color)
{
    /* 5-bit, 6-bits, 5-bits */ 
    *((__u16 *)(screen.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(unsigned int x, unsigned int y)
{
    int color = *((__u16 *)(screen.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(unsigned int x, unsigned int y, int color)
{
    screen.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(unsigned int x, unsigned int y)
{
    int color = screen.fbaddress[POINTPOS(x, y)];
    return (((color >> 5) & 0x7) << (16 + 5)) | (((color >> 3) & 0x3) << (8 + 6)) | ((color & 0x7) << 5);
}

/** Put pixel into viewport 
 *
 * @param vp Viewport identification
 * @param x X coord relative to viewport
 * @param y Y coord relative to viewport
 * @param color RGB color 
 */
static void putpixel(int vp, unsigned int x, unsigned int y, int color)
{
    screen.putpixel(viewports[vp].x + x, viewports[vp].y + y, color);
}
/** Get pixel from viewport */
static int getpixel(int vp, unsigned int x, unsigned int y)
{
    return screen.getpixel(viewports[vp].x + x, viewports[vp].y + y);
}

/** Fill line with color BGCOLOR */
static void clear_line(int vp, unsigned int y)
{
    unsigned int x;
    for (x = 0; x < viewports[vp].width; x++)
        putpixel(vp, x, y, viewports[vp].bgcolor);
}

/** Fill viewport with background color */
static void clear_port(int vp)
{
    unsigned int y;

    clear_line(vp, 0);
    for (y = viewports[vp].y+1; y < viewports[vp].y+viewports[vp].height; y++) {
        memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
               &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
               screen.pixelbytes * viewports[vp].width);
    }   
}

/** Scroll port up/down 
 *
 * @param vp Viewport to scroll
 * @param rows Positive number - scroll up, negative - scroll down
 */
static void scroll_port(int vp, int rows)
{
    int y;
    int startline;
    int endline;
    
    if (rows > 0) {
        for (y=viewports[vp].y; y < viewports[vp].y+viewports[vp].height - rows*FONT_SCANLINES; y++)
            memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                   &screen.fbaddress[POINTPOS(viewports[vp].x,y + rows*FONT_SCANLINES)],
                   screen.pixelbytes * viewports[vp].width);
        /* Clear last row */
        startline = viewports[vp].y+FONT_SCANLINES*(viewports[vp].rows-1);
        endline = viewports[vp].y + viewports[vp].height;
        clear_line(vp, startline);
        for (y=startline+1;y < endline; y++)
            memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                   &screen.fbaddress[POINTPOS(viewports[vp].x,startline)],
                   screen.pixelbytes * viewports[vp].width);
                  
    } else if (rows < 0) {
        rows = -rows;
        for (y=viewports[vp].y + viewports[vp].height-1; y >= viewports[vp].y + rows*FONT_SCANLINES; y--)
            memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
                &screen.fbaddress[POINTPOS(viewports[vp].x,y - rows*FONT_SCANLINES)],
                screen.pixelbytes * viewports[vp].width);
        /* Clear first row */
        clear_line(0, viewports[vp].bgcolor);
        for (y=1;y < rows*FONT_SCANLINES; y++)
            memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y+y)],
                   &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
                   screen.pixelbytes * viewports[vp].width);
    }
}

static void invert_pixel(int vp,unsigned int x, unsigned int y)
{
    putpixel(vp, x, y, ~getpixel(vp, x, y));
}


/** Draw one line of glyph at a given position */
static void draw_glyph_line(int vp,unsigned int glline, unsigned int x, unsigned int y)
{
    unsigned int i;

    for (i = 0; i < 8; i++)
        if (glline & (1 << (7 - i))) {
            putpixel(vp, x + i, y, viewports[vp].fgcolor);
        } else
            putpixel(vp, x + i, y, viewports[vp].bgcolor);
}

/***************************************************************/
/* Character-console functions */

/** Draw character at given position */
static void draw_glyph(int vp,__u8 glyph, unsigned int sx, unsigned int sy)
{
    unsigned int y;

    for (y = 0; y < FONT_SCANLINES; y++)
        draw_glyph_line(vp ,fb_font[glyph * FONT_SCANLINES + y], sx, sy + y);
}

/** Invert character at given position */
static void invert_char(int vp,unsigned int row, unsigned int col)
{
    unsigned int x;
    unsigned int y;

    for (x = 0; x < COL_WIDTH; x++)
        for (y = 0; y < FONT_SCANLINES; y++)
            invert_pixel(vp, col * COL_WIDTH + x, row * FONT_SCANLINES + y);
}

static void draw_logo(int vp,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)
                putpixel(vp ,startx + x, starty + y, viewports[vp].fgcolor);
        }
}

/***************************************************************/
/* Stdout specific functions */


/** Create new viewport
 *
 * @return New viewport number
 */
static int viewport_create(unsigned int x, unsigned int y,unsigned int width, 
               unsigned int height)
{
    int i;

for (i=0; i < MAX_VIEWPORTS; i++) {
        if (!viewports[i].initialized)
            break;
    }
    if (i == MAX_VIEWPORTS)
        return ELIMIT;

    if (width ==0 || height == 0 ||
        x+width > screen.xres || y+height > screen.yres)
        return EINVAL;
    if (width < FONT_SCANLINES || height < COL_WIDTH)
        return EINVAL;

    viewports[i].x = x;
    viewports[i].y = y;
    viewports[i].width = width;
    viewports[i].height = height;
    
    viewports[i].rows = height / FONT_SCANLINES;
    viewports[i].cols = width / COL_WIDTH;

    viewports[i].bgcolor = DEFAULT_BGCOLOR;
    viewports[i].fgcolor = DEFAULT_FGCOLOR;
    
    viewports[i].cur_col = 0;
    viewports[i].cur_row = 0;
    viewports[i].cursor_active = 0;

    viewports[i].initialized = 1;

    return i;
}


/** 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
 *
 */
static void screen_init(void *addr, unsigned int xres, unsigned int yres, unsigned int bpp, unsigned int scan)
{
    switch (bpp) {
        case 8:
            screen.putpixel = putpixel_1byte;
            screen.getpixel = getpixel_1byte;
            screen.pixelbytes = 1;
            break;
        case 16:
            screen.putpixel = putpixel_2byte;
            screen.getpixel = getpixel_2byte;
            screen.pixelbytes = 2;
            break;
        case 24:
            screen.putpixel = putpixel_3byte;
            screen.getpixel = getpixel_3byte;
            screen.pixelbytes = 3;
            break;
        case 32:
            screen.putpixel = putpixel_4byte;
            screen.getpixel = getpixel_4byte;
            screen.pixelbytes = 4;
            break;
    }

        
    screen.fbaddress = (unsigned char *) addr;
    screen.xres = xres;
    screen.yres = yres;
    screen.scanline = scan;
    
    /* Create first viewport */
    viewport_create(0,0,xres,yres);

    clear_port(0);
}

static void cursor_hide(int vp)
{
    viewport_t *vport = &viewports[vp];

    if (vport->cursor_active && vport->cursor_shown) {
        invert_char(vp, vport->cur_row, vport->cur_col);
        vport->cursor_shown = 0;
    }
}

static void cursor_print(int vp)
{
    viewport_t *vport = &viewports[vp];

    /* Do not check for cursor_shown */
    if (vport->cursor_active) {
        invert_char(vp, vport->cur_row, vport->cur_col);
        vport->cursor_shown = 1;
    }
}

static void cursor_blink(int vp)
{
    viewport_t *vport = &viewports[vp];

    if (vport->cursor_shown)
        cursor_hide(vp);
    else
        cursor_print(vp);
}

/** Draw character at given position relative to viewport 
 * 
 * @param vp Viewport identification
 * @param c Character to print
 * @param row Screen position relative to viewport
 * @param col Screen position relative to viewport
 */
static void draw_char(int vp, char c, unsigned int row, unsigned int col)
{
    viewport_t *vport = &viewports[vp];

    /* Optimize - do not hide cursor if we are going to overwrite it */
    if (vport->cursor_active && vport->cursor_shown && 
        (vport->cur_col != col || vport->cur_row != row))
        invert_char(vp, vport->cur_row, vport->cur_col);
    
    draw_glyph(vp, c, col * COL_WIDTH, row * FONT_SCANLINES);

    vport->cur_col = col;
    vport->cur_row = row;

    vport->cur_col++;
    if (vport->cur_col>= vport->cols) {
        vport->cur_col = 0;
        vport->cur_row++;
        if (vport->cur_row >= vport->rows)
            vport->cur_row--;
    }
    cursor_print(vp);
}

static void draw_text_data(int vp, keyfield_t *data)
{
    viewport_t *vport = &viewports[vp];
    int i;
    char c;

    clear_port(vp);
    for (i=0; i < vport->cols * vport->rows; i++) {
        if (data[i].character == ' ') /* TODO: && data[i].style==vport->style */
            continue;
        draw_char(vp, data[i].character, i/vport->rows, i % vport->cols);
    }
    cursor_print(vp);
}


/** Function for handling connections to FB
 *
 */
static void fb_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
    ipc_callid_t callid;
    ipc_call_t call;
    int retval;
    int i;
    unsigned int row,col;
    char c;
    keyfield_t *interbuffer = NULL;
    size_t intersize = 0;

    int vp = 0;
    viewport_t *vport = &viewports[0];

    if (client_connected) {
        ipc_answer_fast(iid, ELIMIT, 0,0);
        return;
    }
    client_connected = 1;
    ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */

    while (1) {
        callid = async_get_call_timeout(&call,250000);
        if (!callid) {
            cursor_blink(vp);
            continue;
        }
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            client_connected = 0;
            /* cleanup other viewports */
            for (i=1; i < MAX_VIEWPORTS; i++)
                vport->initialized = 0;
            ipc_answer_fast(callid,0,0,0);
            return; /* Exit thread */
        case IPC_M_AS_AREA_SEND:
            /* We accept one area for data interchange */
            intersize = IPC_GET_ARG2(call);
            receive_comm_area(callid,&call,(void **)&interbuffer,
                      sizeof(*interbuffer)*viewports[0].cols*viewports[0].rows);
            continue;

        case FB_DRAW_TEXT_DATA:
            if (!interbuffer) {
                retval = EINVAL;
                break;
            }
            if (intersize < vport->cols*vport->rows*sizeof(*interbuffer)) {
                retval = EINVAL;
                break;
            }
            draw_text_data(vp, interbuffer);
            retval = 0;
            break;
        case FB_PUTCHAR:
            c = IPC_GET_ARG1(call);
            row = IPC_GET_ARG2(call);
            col = IPC_GET_ARG3(call);
            if (row >= vport->rows || col >= vport->cols) {
                retval = EINVAL;
                break;
            }
            ipc_answer_fast(callid,0,0,0);

            draw_char(vp, c, row, col);
            continue; /* msg already answered */
        case FB_CLEAR:
            clear_port(vp);
            cursor_print(vp);
            retval = 0;
            break;
        case FB_CURSOR_GOTO:
            row = IPC_GET_ARG1(call);
            col = IPC_GET_ARG2(call);
            if (row >= vport->rows || col >= vport->cols) {
                retval = EINVAL;
                break;
            }
            retval = 0;
            cursor_hide(vp);
            vport->cur_col = col;
            vport->cur_row = row;
            cursor_print(vp);
            break;
        case FB_CURSOR_VISIBILITY:
            cursor_hide(vp);
            vport->cursor_active = IPC_GET_ARG1(call);
            cursor_print(vp);
            retval = 0;
            break;
        case FB_GET_CSIZE:
            ipc_answer_fast(callid, 0, vport->rows, vport->cols);
            continue;
        case FB_SCROLL:
            i = IPC_GET_ARG1(call);
            if (i > vport->rows || i < (- (int)vport->rows)) {
                retval = EINVAL;
                break;
            }
            cursor_hide(vp);
            scroll_port(vp, i);
            cursor_print(vp);
            retval = 0;
            break;
        case FB_VIEWPORT_SWITCH:
            i = IPC_GET_ARG1(call);
            if (i < 0 || i >= MAX_VIEWPORTS) {
                retval = EINVAL;
                break;
            }
            if (! viewports[i].initialized ) {
                retval = EADDRNOTAVAIL;
                break;
            }
            cursor_hide(vp);
            vp = i;
            vport = &viewports[vp];
            cursor_print(vp);
            retval = 0;
            break;
        case FB_VIEWPORT_CREATE:
            retval = viewport_create(IPC_GET_ARG1(call) >> 16,
                         IPC_GET_ARG1(call) & 0xffff,
                         IPC_GET_ARG2(call) >> 16,
                         IPC_GET_ARG2(call) & 0xffff);
            break;
        case FB_VIEWPORT_DELETE:
            i = IPC_GET_ARG1(call);
            if (i < 0 || i >= MAX_VIEWPORTS) {
                retval = EINVAL;
                break;
            }
            if (! viewports[i].initialized ) {
                retval = EADDRNOTAVAIL;
                break;
            }
            viewports[i].initialized = 0;
            retval = 0;
            break;
        case FB_SET_STYLE:
            vport->fgcolor = IPC_GET_ARG1(call);
            vport->bgcolor = IPC_GET_ARG2(call);
            retval = 0;
            break;
        case FB_GET_RESOLUTION:
            ipc_answer_fast(callid, 0, screen.xres,screen.yres);
            continue;
        default:
            retval = ENOENT;
        }
        ipc_answer_fast(callid,retval,0,0);
    }
}

/** Initialization of framebuffer */
int fb_init(void)
{
    void *fb_ph_addr;
    unsigned int fb_width;
    unsigned int fb_height;
    unsigned int fb_bpp;
    unsigned int fb_scanline;
    void *fb_addr;
    size_t asz;

    async_set_client_connection(fb_client_connection);

    fb_ph_addr=(void *)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");

    asz = fb_scanline*fb_height;
    fb_addr = as_get_mappable_page(asz);
    
    map_physmem(fb_ph_addr, fb_addr, ALIGN_UP(asz,PAGE_SIZE) >>PAGE_WIDTH,
            AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE);
    
    screen_init(fb_addr, fb_width, fb_height, fb_bpp, fb_scanline);

    return 0;
}