mod mbc1;
mod mbc2;
mod mbc3;
mod mbc5;

pub use mbc1::MBC1;
pub use mbc2::MBC2;
pub use mbc3::MBC3;
pub use mbc5::MBC5;

pub trait MBC {
    fn read_byte(&self, addr: u16) -> u8;
    fn write_byte(&mut self, addr: u16, val: u8);

    fn dump_ram(&self, file: &str);
}

pub struct NoMBC {
    rom: Box<[u8]>,
    ram: Box<[u8]>,
}

impl NoMBC {
    pub fn new(rom: Box<[u8]>, ram: Box<[u8]>) -> NoMBC {
        NoMBC { rom, ram }
    }
}

impl MBC for NoMBC {
    fn dump_ram(&self, file: &str) {
        super::write_file(&file, &self.ram).expect("Saving failed");
    }

    fn write_byte(&mut self, addr: u16, val: u8) {
        println!(
            "Writing not supported for cartridges without MBC. (Tried to set {:04X} to {:02X})",
            addr, val
        );
    }

    fn read_byte(&self, addr: u16) -> u8 {
        match addr {
            0x0000..=0x7FFF => self.rom[addr as usize],
            0xA000..=0xBFFF => {
                // TODO: Check for ram
                let addr = (addr as usize) - 0xA000;

                if addr >= self.ram.len() {
                    println!(
                        "Tried to access {:04X}, however the memory is not present.",
                        addr + 0xA000
                    );
                    0
                } else {
                    self.ram[addr]
                }
            }
            _ => {
                panic!("Cartride: Unable to read from {:04X}", addr);
            }
        }
    }
}