/*
 * fbdash.c
 *
 * Adapted by Florian Klemenz for use in the fb_dash project
 *
 * Source and all credit goes to 
 * http://raspberrycompote.blogspot.com/
 * -------------------------------------------------------------------------------------------- 
 *
 * http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
 *
 * Original work by J-P Rosti (a.k.a -rst- and 'Raspberry Compote')
 *
 * Licensed under the Creative Commons Attribution 3.0 Unported License
 * (http://creativecommons.org/licenses/by/3.0/deed.en_US)
 *
 * Distributed in the hope that this will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

#include "fblib.h"
#include "fbfonts.h"

// 'global' variables to store screen info
char *fbp = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;


#define FONTW 8
#define FONTH 8

// helper function for drawing - no more need to go mess with
// the main function when just want to change what to draw...
void draw() {
   
    clear_screen(fbp);

    // horizontal spacersint x_space = 10;
    int y_step_width = vinfo.yres / 4;
    for (int i = 1; i < 4; i++) {
        int x0 = 15;
        int x1 = vinfo.xres - x0;
        int y = y_step_width * i;

        int r = 200;
        int g = 32;
        int b = 32;
        
        draw_line(fbp, x0, y-1, x1, y-1, r, g, b);
        draw_line(fbp, x0, y  , x1, y  , r, g, b);
        draw_line(fbp, x0, y+1, x1, y+1, r, g, b);
    }




	char *text = "HUHU!";
    int text_length =  strlen(text);
    int i, x, y;

	// see https://www.geeksforgeeks.org/pointer-array-array-pointer/
	//char *fontImg = font8x8_basic;

    for (i = 0; i < text_length; i++) { // each character
        int ix = text[i];
		//printf("%c --> %d\n", text[i], ix);

        char *img = font8x8_basic[ix];
        // loop through pixel rows (8 rows with 8 pixels/bits or 1 bytes each)
        for (y = 0; y < FONTH; y++) { // each line
			
            // loop through pixel/bit columns
			char row = img[y];

            for (x = 0; x < FONTW; x++) { // each column
			    unsigned char mask = 1 << x;
				if(row & mask) {
					printf("x");
                    // plot the pixel
					put_pixel(fbp, i * FONTW + x, y, 255, 255, 255);
		 		}
				else {
					printf(" ");
					// leave empty (or maybe plot 'text backgr color')
				}
            } // end "for x"
			printf("\n");

        } // end "for y"
    } // end "for i"

}

// application entry point
int main(int argc, char* argv[])
{

    int fbfd = 0;
    //struct fb_var_screeninfo orig_vinfo;
    long int screensize = 0;

    // Open the framebuffer file for reading and writing
    fbfd = open("/dev/fb1", O_RDWR);
    if (fbfd == -1) {
        printf("Error: cannot open framebuffer device.\n");
        return(1);
    }
    printf("The framebuffer device was opened successfully.\n");

    // Get variable screen information
    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
        printf("Error reading variable information.\n");
    }
    printf("Variable info: %dx%d, %dbpp\n", 
            vinfo.xres, vinfo.yres, 
            vinfo.bits_per_pixel );

    // Get fixed screen information
    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
        printf("Error reading fixed information.\n");
    }
    printf("Fixed info: smem_len %d, line_length %d\n", finfo.smem_len, finfo.line_length);

    // map fb to user mem 
    screensize = finfo.smem_len;
    fbp = (char*)mmap(0, 
              screensize, 
              PROT_READ | PROT_WRITE, 
              MAP_SHARED, 
              fbfd, 
              0);

    if ((int)fbp == -1) {
        printf("Failed to mmap.\n");
    }
    else {
        // draw...
        draw();
    }

    // cleanup
    //clear_screen(fbp);
    // unmap fb file from memory
    munmap(fbp, screensize);
    // close fb file    
    close(fbfd);

    return 0;
  
}