use crate::CHIP8_MEMORY_SIZE;


pub mod text_rendering;

pub const CHIP8FONT_0: [u8; 5] = [0xF0, 0x90, 0x90, 0x90, 0xF0];
pub const CHIP8FONT_1: [u8; 5] = [0x20, 0x60, 0x20, 0x20, 0x70];
pub const CHIP8FONT_2: [u8; 5] = [0xF0, 0x10, 0xF0, 0x80, 0xF0];
pub const CHIP8FONT_3: [u8; 5] = [0xF0, 0x10, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_4: [u8; 5] = [0x90, 0x90, 0xF0, 0x10, 0x10];
pub const CHIP8FONT_5: [u8; 5] = [0xF0, 0x80, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_6: [u8; 5] = [0xF0, 0x80, 0xF0, 0x90, 0xF0];
pub const CHIP8FONT_7: [u8; 5] = [0xF0, 0x10, 0x20, 0x40, 0x40];
pub const CHIP8FONT_8: [u8; 5] = [0xF0, 0x90, 0xF0, 0x90, 0xF0];
pub const CHIP8FONT_9: [u8; 5] = [0xF0, 0x90, 0xF0, 0x10, 0xF0];
pub const CHIP8FONT_A: [u8; 5] = [0xF0, 0x90, 0xF0, 0x90, 0x90];
pub const CHIP8FONT_B: [u8; 5] = [0xE0, 0x90, 0xE0, 0x90, 0xE0];
pub const CHIP8FONT_C: [u8; 5] = [0xF0, 0x80, 0x80, 0x80, 0xF0];
pub const CHIP8FONT_D: [u8; 5] = [0xE0, 0x90, 0x90, 0x90, 0xE0];
pub const CHIP8FONT_E: [u8; 5] = [0xF0, 0x80, 0xF0, 0x80, 0xF0];
pub const CHIP8FONT_F: [u8; 5] = [0xF0, 0x80, 0xF0, 0x80, 0x80];

pub fn load_fonts_into_memory(to_add_fonts_to: [u8; CHIP8_MEMORY_SIZE as usize])
    -> [u8; CHIP8_MEMORY_SIZE as usize] {

        let mut memory = to_add_fonts_to.clone();
       
        let all_font_characters = [
            CHIP8FONT_0,
            CHIP8FONT_1,
            CHIP8FONT_2,
            CHIP8FONT_3,
            CHIP8FONT_4,
            CHIP8FONT_5,
            CHIP8FONT_6,
            CHIP8FONT_7,
            CHIP8FONT_8,
            CHIP8FONT_9,
            CHIP8FONT_A,
            CHIP8FONT_B,
            CHIP8FONT_C,
            CHIP8FONT_D,
            CHIP8FONT_E,
            CHIP8FONT_F,
        ];

        for (font_index, current_font) in all_font_characters.iter().enumerate() {
            for font_mem_offset in 0..=4 {
                let real_offset = font_index * 5 + font_mem_offset;
                memory[real_offset] = current_font[font_mem_offset];
            }
        }

        memory
    }