sdmmc-core 0.5.0

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

mod cd;

pub use cd::*;

lib_bitfield! {
    /// Argumentument for ACMD6.
    pub Argument(u32): u8 {
        raw_set_cd: 0;
    }
}

impl Argument {
    /// Represents the byte length of the [Argument].
    pub const LEN: usize = 4;
    /// Represents the raw default value of the [Argument].
    pub const DEFAULT: u32 = 0;

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

    /// Gets the `bus width` field for the [Argument].
    pub const fn set_cd(&self) -> CardDetect {
        CardDetect::from_bool(self.raw_set_cd())
    }

    /// Sets the `bus width` field for the [Argument].
    pub fn set_set_cd(&mut self, val: CardDetect) {
        self.set_raw_set_cd(val.into_bool());
    }

    /// Attempts to convert a [`u32`] into an [Argument].
    pub const fn try_from_bits(val: u32) -> Result<Self> {
        Ok(Self(val))
    }

    /// Converts the [Argument] into a byte array.
    pub const fn bytes(&self) -> [u8; Self::LEN] {
        self.0.to_be_bytes()
    }

    /// Attempts to convert a [`u32`] into an [Argument].
    pub const fn try_from_bytes(val: &[u8]) -> Result<Self> {
        match val.len() {
            len if len < Self::LEN => Err(Error::invalid_length(len, Self::LEN)),
            _ => Self::try_from_bits(u32::from_be_bytes([val[0], val[1], val[2], val[3]])),
        }
    }
}

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

impl TryFrom<u32> for Argument {
    type Error = Error;

    fn try_from(val: u32) -> Result<Self> {
        Self::try_from_bits(val)
    }
}

impl From<Argument> for u32 {
    fn from(val: Argument) -> Self {
        val.bits()
    }
}

impl From<Argument> for [u8; Argument::LEN] {
    fn from(val: Argument) -> Self {
        val.bytes()
    }
}

impl TryFrom<&[u8]> for Argument {
    type Error = Error;

    fn try_from(val: &[u8]) -> Result<Self> {
        Self::try_from_bytes(val)
    }
}

impl<const N: usize> TryFrom<&[u8; N]> for Argument {
    type Error = Error;

    fn try_from(val: &[u8; N]) -> Result<Self> {
        Self::try_from_bytes(val.as_ref())
    }
}

impl<const N: usize> TryFrom<[u8; N]> for Argument {
    type Error = Error;

    fn try_from(val: [u8; N]) -> Result<Self> {
        Self::try_from_bytes(val.as_ref())
    }
}

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

    #[test]
    fn test_fields() {
        let new_set_cd = CardDetect::new();

        (1..=u32::BITS)
            .map(|r| ((1u64 << r) - 1) as u32)
            .for_each(|raw_arg| {
                let raw = raw_arg.to_be_bytes();

                match Argument::try_from_bits(raw_arg) {
                    Ok(mut exp_arg) => {
                        let exp_set_cd = CardDetect::from_bool((raw_arg & 0b1) != 0);

                        assert_eq!(Argument::try_from_bits(raw_arg), Ok(exp_arg));
                        assert_eq!(Argument::try_from_bytes(&raw), Ok(exp_arg));
                        assert_eq!(Argument::try_from(raw_arg), Ok(exp_arg));
                        assert_eq!(Argument::try_from(raw), Ok(exp_arg));
                        assert_eq!(Argument::try_from(&raw), Ok(exp_arg));

                        assert_eq!(exp_arg.set_cd(), exp_set_cd);

                        exp_arg.set_set_cd(new_set_cd);
                        assert_eq!(exp_arg.set_cd(), new_set_cd);

                        exp_arg.set_set_cd(exp_set_cd);
                        assert_eq!(exp_arg.set_cd(), exp_set_cd);
                    }
                    Err(err) => {
                        let exp_err = Error::invalid_field_variant(
                            "command::argument::set_cd",
                            (raw_arg & 0b11) as usize,
                        );
                        assert_eq!(err, exp_err);
                        assert_eq!(Argument::try_from_bytes(&raw), Err(exp_err));
                        assert_eq!(Argument::try_from(raw_arg), Err(exp_err));
                        assert_eq!(Argument::try_from(raw), Err(exp_err));
                        assert_eq!(Argument::try_from(&raw), Err(exp_err));
                    }
                }
            });
    }
}