use serde::{Deserialize, Deserializer};
use lexica::{Blob, StrongRef};

// see https://deer.social/profile/did:plc:63y3oh7iakdueqhlj6trojbq/post/3ltuv4skhqs2h
pub fn safe_string<'de, D: Deserializer<'de>>(deserializer: D) -> Result<String, D::Error> {
    let str = String::deserialize(deserializer)?;

    Ok(str.replace('\u{0000}', ""))
}

pub fn blob_ref(blob: Option<Blob>) -> Option<String> {
    blob.map(|blob| blob.cid.to_string())
}

pub fn strongref_to_parts(
    strongref: Option<&StrongRef>,
) -> (Option<String>, Option<String>) {
    strongref
        .map(|sr| (sr.uri.clone(), sr.cid.to_string()))
        .unzip()
}

pub fn empty_str_as_none(input: String) -> Option<String> {
    match input.is_empty() {
        true => None,
        false => Some(input),
    }
}

pub fn u64_from_ivec(val: sled::IVec) -> Option<u64> {
    if val.len() == 8 {
        let bytes = val[0..8].try_into().ok()?;
        Some(u64::from_le_bytes(bytes))
    } else {
        None
    }
}