pub mod log;
use std::fmt::Display;

use anyhow::{anyhow, Result};
pub use log::init_logger;
use shared_memory::{Shmem, ShmemConf, ShmemError};

// #[repr(C)]
// struct YubideckInput {
//     pub ir_value: u8,
//     pub buttons: u8,
//     pub touch_data: [u8; 32],
//     pub card_status: u8,
//     pub card_id: [u8; 10],
// }
pub const INPUT_SHMEM_SIZE: usize = 45;

// #[repr(C)]
// struct YubideckOutputGaosan {
//     // Always 0
//     pub packet_type: u8,
//     pub slider_led_data: [u8; 60],
// }
//
// #[repr(C)]
// struct YubideckOutputDasi {
//     // Always 1
//     pub packet_type: u8,
//     pub slider_led_data: [u8; 33],
//     pub left_air_led: [u8; 3],
//     pub right_air_led: [u8; 3],
//     pub card_reader_led: [u8; 3],
//     pub padding: [u8; 18],
// }
//
// There's an extra byte (byte 122) for AimeIO to communicate to ChuniIO 
// that reader LED has changed and ChuniIO should update it.
pub const OUTPUT_SHMEM_SIZE: usize = 123;

pub fn create_shared_memory<S>(os_id: S, size: usize, is_owner: bool) -> Result<Shmem>
where
    S: AsRef<str> + Display + Copy,
{
    let shmem_conf = ShmemConf::new().size(size).os_id(os_id);
    let shmem_result = match shmem_conf.clone().create() {
        Ok(s) => Ok(s),
        Err(ShmemError::MappingIdExists) => shmem_conf.open(),
        Err(e) => {
            return Err(anyhow!(
                "Failed to create/open shared memory {os_id}: {e:#}"
            ));
        }
    };

    shmem_result
        .map(|mut m| {
            m.set_owner(is_owner);
            m
        })
        .map_err(|e| anyhow!("Failed to create/open shared memory {os_id}: {e:#}"))
}