use crate::periph::hm62256::Hm62256;

impl Hm62256 {
    fn tick(&mut self, address_bus: u16, data_bus: u8, read_mode: bool) -> (u16, u8) {
        let new_data_bus = if read_mode {
            // reading from ram
            self.data[address_bus as usize]
        } else {
            // writing to ram
            self.data[address_bus as usize] = data_bus.into();
            data_bus
        };
        (address_bus, new_data_bus)
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn smoke() { assert!(true); }

    #[test]
    fn write_to_memory_read_back_works_at_0() {
        let mut ram = Hm62256::default();

        // load the data to ram
        ram.tick(0x0000, 0xab, false);
        // read the data back
        let (_, new_data) = ram.tick(0x0000, 0x00, true);

        assert_eq!(new_data, 0xab);
    }
}