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//! This crate contains types implementing the Serializer trait of fuzzcheck.
//! There are currently two implementations:
//!
//! * SerdeSerializer uses the `serde` and `serde_json` crate to serialize
//! the test inputs (of arbitrary Serializable type) to a `.json` file.
//! It is available under the “serde” feature
//!
//! * [ByteSerializer] encodes and decodes values of type `Vec<u8>` by simply
//! copy/pasting the bytes from/to the files. The extension is customizable.
//!

extern crate fuzzcheck_traits;

#[cfg(feature = "serde_serializer")]
extern crate serde;
#[cfg(feature = "serde_serializer")]
extern crate serde_json;

#[cfg(feature = "serde_serializer")]
use std::marker::PhantomData;

/// `SerdeSerializer<T>` uses `serde` and `serde_json` to serialize the test
/// inputs (of arbitrary type `T: Serializable+ for<'e> Deserializable<'e>`)
/// to a json file.
#[cfg(feature = "serde_serializer")]
pub struct SerdeSerializer<S> {
    phantom: PhantomData<S>,
}

#[cfg(feature = "serde_serializer")]
impl<S> Default for SerdeSerializer<S> {
    fn default() -> Self {
        Self { phantom: PhantomData }
    }
}

#[cfg(feature = "serde_serializer")]
impl<S> fuzzcheck_traits::Serializer for SerdeSerializer<S>
where
    S: serde::Serialize + for<'e> serde::Deserialize<'e>,
{
    type Value = S;
    fn extension(&self) -> &str {
        "json"
    }
    fn from_data(&self, data: &[u8]) -> Option<S> {
        serde_json::from_slice(data).ok()
    }
    fn to_data(&self, value: &Self::Value) -> Vec<u8> {
        serde_json::to_vec(value).unwrap()
    }
}

/**
A Serializer for Vec<u8> that simply copies the bytes from/to the files.

```ignore
fn parse(data: &[u8]) -> bool {
    // ...
}
let mutator = VecMutator<U8Mutator>::default();

// pass the desired extension of the file as argument
let serializer = ByteSerializer::new("png");

fuzzcheck::launch(parse, mutator, serializer)
```
*/
pub struct ByteSerializer {
    ext: &'static str,
}

impl ByteSerializer {
    pub fn new(ext: &'static str) -> Self {
        Self { ext }
    }
}

impl fuzzcheck_traits::Serializer for ByteSerializer {
    type Value = Vec<u8>;
    fn extension(&self) -> &str {
        self.ext
    }
    fn from_data(&self, data: &[u8]) -> Option<Self::Value> {
        Some(data.into())
    }
    fn to_data(&self, value: &Self::Value) -> Vec<u8> {
        value.clone()
    }
}