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use crate::error::Error;
use alloc::{format, vec::Vec};
use core::marker::PhantomData;
use serde::{Deserialize, Serialize};

/// Serialized plain-text to hold determine lifetime of `serde::Deserialize<'de>`.
#[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct SerializedPlain<T> {
    serialized_plain: Vec<u8>,
    _type: PhantomData<T>,
}

impl<T> SerializedPlain<T> {
    pub(in crate::traits) fn new(serialized_plain: Vec<u8>) -> Self {
        Self {
            serialized_plain,
            _type: PhantomData::default(),
        }
    }

    /// Deserialize to get plain message.
    ///
    /// # Failures
    ///
    /// - [DeserializationError](crate::error::ErrorKind::DeserializationError) when failed to deserialize decrypted message.
    pub fn deserialize<'de>(&'de self) -> Result<T, Error>
    where
        T: Sized + Deserialize<'de>,
    {
        serde_cbor::from_slice(&self.serialized_plain).map_err(|e| {
            Error::deserialization_error(&format!(
                "error on serde_cbor deserialization after decryption: {:?}",
                e
            ))
        })
    }
}

/// # Failures
///
/// - [SerializationError](crate::error::ErrorKind::SerializationError) when failed to serialize message.
pub(in crate::traits) fn serialize<T>(v: &T) -> Result<Vec<u8>, Error>
where
    T: Serialize,
{
    serde_cbor::to_vec(v).map_err(|e| {
        Error::serialization_error(&format!("failed to serialize data by serde_cbor: {:?}", e))
    })
}