sdmmc-core 0.5.0

use crate::result::{Error, Result};

/// The base value for [Month].
pub const MONTH_BASE: u8 = 1;
/// The maximum value for [Month].
pub const MONTH_MAX: u8 = 12;

/// Represents the month field in a [ManufacturingDate](super::ManufacturingDate).
#[repr(C)]
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct Month(u8);

impl Month {
    /// Creates a new [Month].
    pub const fn new() -> Self {
        Self(0)
    }

    /// Gets the bit value of the [Month].
    pub const fn bits(&self) -> u8 {
        self.0
    }

    /// Converts a [`u8`] into a [Month].
    pub const fn try_from_bits(val: u8) -> Result<Self> {
        match val {
            v if v < MONTH_BASE || v > MONTH_MAX => Err(Error::InvalidVariant(val as usize)),
            _ => Ok(Self(val)),
        }
    }
}

impl Default for Month {
    fn default() -> Self {
        Self::new()
    }
}

impl TryFrom<u8> for Month {
    type Error = Error;

    fn try_from(val: u8) -> Result<Self> {
        Self::try_from_bits(val)
    }
}

impl From<Month> for u8 {
    fn from(val: Month) -> Self {
        val.bits()
    }
}

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

    #[test]
    fn test_valid() {
        (MONTH_BASE..=MONTH_MAX).for_each(|month| {
            let exp_month = Month(month);

            assert_eq!(Month::try_from_bits(month), Ok(exp_month));
            assert_eq!(exp_month.bits(), month);
        });
    }

    #[test]
    fn test_invalid() {
        (0..=u8::MAX)
            .filter(|y| !(MONTH_BASE..=MONTH_MAX).contains(y))
            .for_each(|month| {
                assert_eq!(
                    Month::try_from_bits(month),
                    Err(Error::InvalidVariant(month as usize))
                );
            });
    }
}