/*
 * SPDX-FileCopyrightText: 2023 Inria
 * SPDX-FileCopyrightText: 2023 Sebastiano Vigna
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 */

//! Example of a zero-copy internal parameter, which is left untouched because
//! of the `#[epserde(force_full_copy)]` marker on the field, but needs
//! `ZeroCopy` to be implemented.
//!
//! Please compile with the "schema" feature to see the schema output.

use epserde::{deser::DeserType, prelude::*, ser::SerType};

#[derive(Epserde, Debug, PartialEq, Eq, Default, Clone)]
struct Data<A: ZeroCopy> {
    #[epserde(force_full_copy)]
    a: Vec<A>,
}

type Type = Data<i32>;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Serializing type: {}", core::any::type_name::<Type>());
    println!(
        "Associated serialization type: {}",
        core::any::type_name::<SerType<Type>>()
    );
    println!();

    // Create a new value to serialize
    let data = Data {
        a: vec![0, 1, 2, 3],
    };
    let mut cursor = <AlignedCursor<Aligned16>>::new();

    // Serialize
    #[cfg(feature = "schema")]
    {
        let schema = unsafe { data.serialize_with_schema(&mut cursor)? };
        println!("{}", schema.to_csv_with_data(cursor.as_bytes()));
        println!();
    }
    #[cfg(not(feature = "schema"))]
    let _bytes_written = unsafe { data.serialize(&mut cursor)? };

    // Do a full-copy deserialization
    cursor.set_position(0);
    let full = unsafe { <Type>::deserialize_full(&mut cursor)? };
    println!(
        "Full-copy deserialization: returns the deserializing type {}",
        core::any::type_name::<Type>(),
    );
    println!("Value: {:x?}", full);

    println!();

    // Do an ε-copy deserialization
    let eps = unsafe { <Type>::deserialize_eps(cursor.as_bytes())? };
    println!(
        "ε-copy deserialization: returns the associated deserialization type {}",
        core::any::type_name::<DeserType<'_, Type>>(),
    );
    println!("Value: {:x?}", eps);

    #[cfg(not(feature = "schema"))]
    println!("\nPlease compile with the \"schema\" feature to see the schema output");
    Ok(())
}
