#include <stdio.h>
#include <inttypes.h>
#include <string.h>
#include <raylib.h>

#define overload _Generic

#define WIDTH 640
#define HEIGHT 480
#define VMEM WIDTH * HEIGHT

Color video_memory[VMEM] = {};
Image charset[26];

void draw_frame() {
    for (int i = 0; i < WIDTH; i++) {
        for (int j = 0; j < HEIGHT; j++) {
            DrawPixel(i, j, video_memory[i + (j * WIDTH)]);
        }
    }
}

void red_line(Color *vmem) {
    static int i = 0;
    for (; i < 70; i++) {
        video_memory[i] = RED;
    }
}

void write_image(Color *vmem, Image image, uint32_t x, uint32_t y) {
    for (int i = 0; i < 16; i++) {
        int image_size = image.width * sizeof(uint32_t); //16 pixels, 4 bytes per pixel
        memcpy(vmem + (i * WIDTH) + (y * WIDTH * 16) + (x * 16),  &image.data[i * image_size], image_size);
    }
}

void load_charset() {    
    char filenames[][26] = {
        "resources/A.png", 
        "resources/B.png",
        "resources/C.png", 
        "resources/D.png",
        "resources/E.png", 
        "resources/F.png",
        "resources/G.png", 
        "resources/H.png",
        "resources/I.png", 
        "resources/J.png",
        "resources/K.png", 
        "resources/L.png",
        "resources/M.png", 
        "resources/N.png",
        "resources/O.png", 
        "resources/P.png",
        "resources/Q.png", 
        "resources/R.png",
        "resources/S.png", 
        "resources/T.png",
        "resources/U.png", 
        "resources/V.png",
        "resources/W.png", 
        "resources/X.png",
        "resources/Y.png", 
        "resources/Z.png"        
    };

    for (int i = 0; i < 26; i++) {
        charset[i] = LoadImage(filenames[i]);
    }
}

int main(void) {
    InitWindow(WIDTH, HEIGHT, "Computer :3");
    SetTargetFPS(60);

    load_charset();

    int i = 0;

    while (!WindowShouldClose()) {
        BeginDrawing();
        ClearBackground(BLUE);

        draw_frame();
        //red_line(video_memory);
        write_image(&video_memory, charset[i++ % 26], 0, 0);
        //tc_putchar(video_memory, &checkers, 1, 2);

        EndDrawing();
    }

    return 0;
}