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use arbitrary::{Arbitrary, Result, Unstructured};
use arrayvec::ArrayString;

use crate::{encode_unix_timestamp_millis, DynamicType, StaticType, TypeSafeId};

#[cfg_attr(docsrs, doc(cfg(feature = "arbitrary")))]
impl<'a, T: StaticType> Arbitrary<'a> for TypeSafeId<T> {
    fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
        let millis = u.arbitrary::<u64>()? & 0xFFFF_FFFF_FFFF; // 48 bits
        let data: [u8; 10] = u.arbitrary()?;

        Ok(Self::from_type_and_uuid(
            T::default(),
            encode_unix_timestamp_millis(millis, &data),
        ))
    }
}

#[cfg_attr(docsrs, doc(cfg(feature = "arbitrary")))]
impl<'a> Arbitrary<'a> for DynamicType {
    fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
        let size = u.arbitrary_len::<u8>()?;
        let mut str = ArrayString::<63>::new();
        while !str.is_full() && str.len() < size {
            match u.peek_bytes(1) {
                Some([b @ b'a'..=b'z']) => {
                    str.push(*b as char);
                    u.bytes(1)?;
                }
                _ => break,
            }
        }
        Ok(DynamicType(str))
    }
}

#[cfg_attr(docsrs, doc(cfg(feature = "arbitrary")))]
impl<'a> Arbitrary<'a> for TypeSafeId<DynamicType> {
    fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
        let tag: DynamicType = u.arbitrary()?;
        let millis = u.arbitrary::<u64>()? & 0xFFFF_FFFF_FFFF; // 48 bits
        let data: [u8; 10] = u.arbitrary()?;

        Ok(Self::from_type_and_uuid(
            tag,
            encode_unix_timestamp_millis(millis, &data),
        ))
    }
}