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use crate::xdr::ScHostValErrorCode;
use stellar_xdr::ScObjectType;

use crate::{
    ConversionError, Env, Object, RawVal, RawValConvertible, Status, TryFromVal, TryIntoVal,
};

impl<E: Env, const N: usize> TryFromVal<E, RawVal> for [u8; N] {
    type Error = Status;

    fn try_from_val(env: &E, val: &RawVal) -> Result<Self, Self::Error> {
        let val = *val;
        if !Object::val_is_obj_type(val, ScObjectType::Bytes) {
            return Err(ScHostValErrorCode::UnexpectedValType.into());
        }
        let bytes = unsafe { Object::unchecked_from_val(val) };
        let len =
            unsafe { u32::unchecked_from_val(env.bytes_len(bytes).map_err(|_| ConversionError)?) }
                as usize;
        if len != N {
            return Err(ConversionError.into());
        }
        let mut arr = [0u8; N];
        env.bytes_copy_to_slice(bytes, RawVal::U32_ZERO, &mut arr)
            .map_err(|_| ConversionError)?;
        Ok(arr)
    }
}

#[cfg(feature = "std")]
impl<E: Env> TryFromVal<E, RawVal> for Vec<u8> {
    type Error = Status;

    fn try_from_val(env: &E, val: &RawVal) -> Result<Self, Self::Error> {
        let val = *val;
        if !Object::val_is_obj_type(val, ScObjectType::Bytes) {
            return Err(ScHostValErrorCode::UnexpectedValType.into());
        }
        let bytes = unsafe { Object::unchecked_from_val(val) };
        let len =
            unsafe { u32::unchecked_from_val(env.bytes_len(bytes).map_err(|_| ConversionError)?) }
                as usize;
        let mut vec = vec![0u8; len];
        env.bytes_copy_to_slice(bytes, RawVal::U32_ZERO, &mut vec)
            .map_err(|_| ConversionError)?;
        Ok(vec)
    }
}

impl<E: Env> TryFromVal<E, &[u8]> for RawVal {
    type Error = Status;
    #[inline(always)]
    fn try_from_val(env: &E, v: &&[u8]) -> Result<RawVal, Self::Error> {
        Ok(env
            .bytes_new_from_slice(v)
            .map_err(|_| ConversionError)?
            .to_raw())
    }
}

impl<E: Env, const N: usize> TryFromVal<E, [u8; N]> for RawVal {
    type Error = Status;

    fn try_from_val(env: &E, v: &[u8; N]) -> Result<Self, Self::Error> {
        v.as_slice().try_into_val(env)
    }
}

#[cfg(feature = "std")]
impl<E: Env> TryFromVal<E, Vec<u8>> for RawVal {
    type Error = Status;

    fn try_from_val(env: &E, v: &Vec<u8>) -> Result<Self, Self::Error> {
        v.as_slice().try_into_val(env)
    }
}