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use crate::Bytes;
use core::fmt;
use core::marker::PhantomData;
use serde::de::{Error, Visitor};
use serde::Deserializer;

#[cfg(any(feature = "std", feature = "alloc"))]
use crate::ByteBuf;

#[cfg(feature = "alloc")]
use alloc::borrow::Cow;
#[cfg(all(feature = "std", not(feature = "alloc")))]
use std::borrow::Cow;

#[cfg(feature = "alloc")]
use alloc::boxed::Box;

#[cfg(feature = "alloc")]
use alloc::vec::Vec;

/// Types that can be deserialized via `#[serde(with = "serde_bytes")]`.
pub trait Deserialize<'de>: Sized {
    #[allow(missing_docs)]
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>;
}

impl<'de: 'a, 'a> Deserialize<'de> for &'a [u8] {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        // Via the serde::Deserialize impl for &[u8].
        serde::Deserialize::deserialize(deserializer)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de> Deserialize<'de> for Vec<u8> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        Deserialize::deserialize(deserializer).map(ByteBuf::into_vec)
    }
}

impl<'de: 'a, 'a> Deserialize<'de> for &'a Bytes {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        Deserialize::deserialize(deserializer).map(Bytes::new)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de> Deserialize<'de> for ByteBuf {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        // Via the serde::Deserialize impl for ByteBuf.
        serde::Deserialize::deserialize(deserializer)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, [u8]> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        Deserialize::deserialize(deserializer).map(Cow::Borrowed)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, Bytes> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        Deserialize::deserialize(deserializer).map(Cow::Borrowed)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de> Deserialize<'de> for Box<[u8]> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        Deserialize::deserialize(deserializer).map(Vec::into_boxed_slice)
    }
}

#[cfg(any(feature = "std", feature = "alloc"))]
impl<'de> Deserialize<'de> for Box<Bytes> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let bytes: Box<[u8]> = Deserialize::deserialize(deserializer)?;
        Ok(bytes.into())
    }
}

impl<'de, T> Deserialize<'de> for Option<T>
where
    T: Deserialize<'de>,
{
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct BytesVisitor<T> {
            out: PhantomData<T>,
        }

        impl<'de, T> Visitor<'de> for BytesVisitor<T>
        where
            T: Deserialize<'de>,
        {
            type Value = Option<T>;

            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.write_str("optional byte array")
            }

            fn visit_unit<E: Error>(self) -> Result<Self::Value, E> {
                Ok(None)
            }

            fn visit_none<E: Error>(self) -> Result<Self::Value, E> {
                Ok(None)
            }

            fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
            where
                D: Deserializer<'de>,
            {
                T::deserialize(deserializer).map(Some)
            }
        }

        let visitor = BytesVisitor { out: PhantomData };
        deserializer.deserialize_option(visitor)
    }
}