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use crate::ethercat::{DcSysTime, EC_CYCLE_TIME_BASE_NANO_SEC};

use super::GPIOIn;

pub const TRANSITION_MODE_SYNC_IDX: u8 = 0x00;
pub const TRANSITION_MODE_SYS_TIME: u8 = 0x01;
pub const TRANSITION_MODE_GPIO: u8 = 0x02;
pub const TRANSITION_MODE_EXT: u8 = 0xF0;
pub const TRANSITION_MODE_NONE: u8 = 0xFE;
pub const TRANSITION_MODE_IMMEDIATE: u8 = 0xFF;

#[non_exhaustive]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub enum TransitionMode {
    SyncIdx,
    SysTime(DcSysTime),
    GPIO(GPIOIn),
    Ext,
    Immediate,
}

impl TransitionMode {
    pub fn mode(&self) -> u8 {
        match self {
            TransitionMode::SyncIdx => TRANSITION_MODE_SYNC_IDX,
            TransitionMode::SysTime(_) => TRANSITION_MODE_SYS_TIME,
            TransitionMode::GPIO(_) => TRANSITION_MODE_GPIO,
            TransitionMode::Ext => TRANSITION_MODE_EXT,
            TransitionMode::Immediate => TRANSITION_MODE_IMMEDIATE,
        }
    }

    pub fn value(&self) -> u64 {
        match self {
            TransitionMode::SyncIdx | TransitionMode::Ext | TransitionMode::Immediate => 0,
            TransitionMode::GPIO(gpio) => *gpio as u64,
            TransitionMode::SysTime(time) => {
                (((time.sys_time().max(1) - 1) / EC_CYCLE_TIME_BASE_NANO_SEC) + 1)
                    * EC_CYCLE_TIME_BASE_NANO_SEC
            }
        }
    }
}