use fpga_lib_macros::include_font_plate;

pub const VGA_ADDRESS: *mut Color = 0x80000000 as *mut Color;
pub const WIDTH: usize = 320;
pub const HEIGHT: usize = 240;

#[repr(transparent)]
pub struct Color(pub(crate) u8);

impl Color {
    pub const fn from_rgb(r: u8, g: u8, b: u8) -> Self {
        Self(((r >> 6) << 6) | ((g >> 5) << 3) | (b >> 5))
    }
}

pub const WHITE: Color = Color::from_rgb(255, 255, 255);
pub const GRAY: Color = Color::from_rgb(128, 128, 128);
pub const LIGHT_GRAY: Color = Color::from_rgb(128, 64, 64);
pub const BLACK: Color = Color::from_rgb(0, 0, 0);
pub const RED: Color = Color::from_rgb(255, 0, 0);
pub const GREEN: Color = Color::from_rgb(0, 255, 0);
pub const BLUE: Color = Color::from_rgb(0, 0, 255);

pub struct VGA {}

impl VGA {
    /// # Safety
    /// `x` must be less than `WIDTH` and `y` must be less than `HEIGHT`
    pub unsafe fn write_pixel_unsafe(x: u16, y: u16, color: Color) {
        unsafe { *VGA_ADDRESS.add(x as usize + y as usize * WIDTH) = color }
    }

    pub unsafe fn draw_char(x: u16, y: u16, c: char) {
        let c = c as u8 - b' ';
        for i in 0..FONT_HEIGHT {
            for j in 0..FONT_WIDTH {
                
            }
        }
    }
}

pub const FONT_WIDTH: usize = 6;
pub const FONT_HEIGHT: usize = 13;
pub const FONTPLATE_WIDTH: usize = 32 * FONT_WIDTH;
pub const FONTPLATE_HEIGHT: usize = 3 * FONT_HEIGHT;
pub const FONTPLATE_SIZE: usize = FONTPLATE_WIDTH * FONTPLATE_HEIGHT / 8;
pub const FONTPLATE: [u8; FONTPLATE_SIZE] = include_font_plate! {"fontplate.png"};