mod cartridge_header;
mod enums;

use crate::cartridge_header::CartridgeHeader;
use crate::enums::DestinationCode;
use std::fs::File;
use std::io::Read;

// https://github.com/ISSOtm/gb-bootroms/blob/2dce25910043ce2ad1d1d3691436f2c7aabbda00/src/dmg.asm#L259-L269
// Each tile is encoded using 2 (!) bytes
// The tiles are represented below
// XX.. .XX. XX.. .... .... .... .... .... .... ...X X... ....
// XXX. .XX. XX.. .... ..XX .... .... .... .... ...X X... ....
// XXX. .XX. .... .... .XXX X... .... .... .... ...X X... ....
// XX.X .XX. XX.X X.XX ..XX ..XX XX.. XX.X X... XXXX X..X XXX.
// XX.X .XX. XX.X XX.X X.XX .XX. .XX. XXX. XX.X X..X X.XX ..XX
// XX.. XXX. XX.X X..X X.XX .XXX XXX. XX.. XX.X X..X X.XX ..XX
// XX.. XXX. XX.X X..X X.XX .XX. .... XX.. XX.X X..X X.XX ..XX
// XX.. .XX. XX.X X..X X.XX ..XX XXX. XX.. XX.. XXXX X..X XXX.
const NINTENDO_LOGO: [u8; 48] = [
    0x0CE, 0x0ED, 0x066, 0x066, 0x0CC, 0x00D, 0x000, 0x00B, 0x003, 0x073, 0x000, 0x083, 0x000,
    0x00C, 0x000, 0x00D, 0x000, 0x008, 0x011, 0x01F, 0x088, 0x089, 0x000, 0x00E, 0x0DC, 0x0CC,
    0x06E, 0x0E6, 0x0DD, 0x0DD, 0x0D9, 0x099, 0x0BB, 0x0BB, 0x067, 0x063, 0x06E, 0x00E, 0x0EC,
    0x0CC, 0x0DD, 0x0DC, 0x099, 0x09F, 0x0BB, 0x0B9, 0x033, 0x03E,
];

// const ROM_NAME: &str = "OtherLegallyObtainedRom.gb";
const ROM_NAME: &str = "LegallyObtainedRom.gb";

fn main() -> std::io::Result<()> {
    let mut rom_file = File::open(ROM_NAME)?;
    let mut rom_buffer: Vec<u8> = Vec::new();
    rom_file.read_to_end(&mut rom_buffer)?;
    let cart_header = match CartridgeHeader::parse(&*rom_buffer) {
        Ok(header) => header,
        Err(_err) => {
            return Err(std::io::Error::new(
                std::io::ErrorKind::Other,
                "Rom failed to parse",
            ));
        }
    };

    let title: String = String::from_iter(cart_header.title);
    println!("Title: {}", title);
    let manufacturer_code = String::from_iter(cart_header.manufacturer_code);
    println!("Manufacturer Code: {}", manufacturer_code);

    match cart_header.old_licensee_code {
        Some(code) => println!("Uses Old Licensee Code: {:#X}", code),
        None => println!(
            "Uses New Licensee Code: {}",
            String::from_iter(cart_header.license_code)
        ),
    }

    println!("CGB Flag: {:?}", cart_header.cgb_flag);
    println!("Supports SGB: {:?}", cart_header.support_gb);
    println!("Cartridge Type: {:?}", cart_header.cart_type);
    println!("ROM Size: {:?}", cart_header.rom_size);
    println!("RAM Size: {:?}", cart_header.ram_size);
    match cart_header.destination_code {
        DestinationCode::Japan => println!("Destination Code: Japan"),
        DestinationCode::NotJapan => println!("Destination Code: Not Japan"),
    }
    println!("Version: {:?}", cart_header.version);
    println!("Header Checksum: {:#X}", cart_header.header_checksum);
    println!("Global Checksum: {:#X}", cart_header.global_checksum);

    Ok(())
}