nautilus-model 0.62.0

// -------------------------------------------------------------------------------------------------
//  Copyright (C) 2015-2026 Nautech Systems Pty Ltd. All rights reserved.
//  https://nautechsystems.io
//
//  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
//  You may not use this file except in compliance with the License.
//  You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
// -------------------------------------------------------------------------------------------------

use std::{
    collections::{HashMap, hash_map::DefaultHasher},
    hash::{Hash, Hasher},
};

use nautilus_core::{
    python::{
        IntoPyObjectNautilusExt,
        serialization::{from_dict_pyo3, to_dict_pyo3},
        to_pyvalue_err,
    },
    serialization::{
        Serializable,
        msgpack::{FromMsgPack, ToMsgPack},
    },
};
use pyo3::{IntoPyObjectExt, basic::CompareOp, prelude::*, types::PyDict};

use crate::{
    data::{BookOrder, OrderBookDelta},
    enums::BookAction,
    identifiers::InstrumentId,
    python::common::PY_MODULE_MODEL,
};

#[pymethods]
#[pyo3_stub_gen::derive::gen_stub_pymethods]
impl OrderBookDelta {
    /// Represents a single change/delta in an order book.
    #[new]
    fn py_new(
        instrument_id: InstrumentId,
        action: BookAction,
        order: BookOrder,
        flags: u8,
        sequence: u64,
        ts_event: u64,
        ts_init: u64,
    ) -> PyResult<Self> {
        Self::new_checked(
            instrument_id,
            action,
            order,
            flags,
            sequence,
            ts_event.into(),
            ts_init.into(),
        )
        .map_err(to_pyvalue_err)
    }

    fn __richcmp__(&self, other: &Self, op: CompareOp, py: Python<'_>) -> Py<PyAny> {
        match op {
            CompareOp::Eq => self.eq(other).into_py_any_unwrap(py),
            CompareOp::Ne => self.ne(other).into_py_any_unwrap(py),
            _ => py.NotImplemented(),
        }
    }

    fn __hash__(&self) -> isize {
        let mut h = DefaultHasher::new();
        self.hash(&mut h);
        h.finish() as isize
    }

    fn __repr__(&self) -> String {
        format!("{self:?}")
    }

    fn __str__(&self) -> String {
        self.to_string()
    }

    #[getter]
    #[pyo3(name = "instrument_id")]
    fn py_instrument_id(&self) -> InstrumentId {
        self.instrument_id
    }

    #[getter]
    #[pyo3(name = "action")]
    fn py_action(&self) -> BookAction {
        self.action
    }

    #[getter]
    #[pyo3(name = "order")]
    fn py_order(&self) -> BookOrder {
        self.order
    }

    #[getter]
    #[pyo3(name = "flags")]
    fn py_flags(&self) -> u8 {
        self.flags
    }

    #[getter]
    #[pyo3(name = "sequence")]
    fn py_sequence(&self) -> u64 {
        self.sequence
    }

    #[getter]
    #[pyo3(name = "ts_event")]
    fn py_ts_event(&self) -> u64 {
        self.ts_event.as_u64()
    }

    #[getter]
    #[pyo3(name = "ts_init")]
    fn py_ts_init(&self) -> u64 {
        self.ts_init.as_u64()
    }

    #[staticmethod]
    #[pyo3(name = "fully_qualified_name")]
    fn py_fully_qualified_name() -> String {
        format!("{}:{}", PY_MODULE_MODEL, stringify!(OrderBookDelta))
    }

    /// Returns the metadata for the type, for use with serialization formats.
    #[staticmethod]
    #[pyo3(name = "get_metadata")]
    fn py_get_metadata(
        instrument_id: &InstrumentId,
        price_precision: u8,
        size_precision: u8,
    ) -> HashMap<String, String> {
        Self::get_metadata(instrument_id, price_precision, size_precision)
    }

    /// Returns the field map for the type, for use with Arrow schemas.
    #[staticmethod]
    #[pyo3(name = "get_fields")]
    fn py_get_fields(py: Python<'_>) -> PyResult<Bound<'_, PyDict>> {
        let py_dict = PyDict::new(py);
        for (k, v) in Self::get_fields() {
            py_dict.set_item(k, v)?;
        }

        Ok(py_dict)
    }

    /// Returns a new object from the given dictionary representation.
    #[staticmethod]
    #[pyo3(name = "from_dict")]
    fn py_from_dict(py: Python<'_>, values: Py<PyDict>) -> PyResult<Self> {
        from_dict_pyo3(py, values)
    }

    /// Return a dictionary representation of the object.
    #[pyo3(name = "to_dict")]
    fn py_to_dict(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
        to_dict_pyo3(py, self)
    }

    /// Return JSON encoded bytes representation of the object.
    #[pyo3(name = "to_json_bytes")]
    fn py_to_json_bytes(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
        self.to_json_bytes()
            .map_err(to_pyvalue_err)?
            .into_py_any(py)
    }

    /// Return `MsgPack` encoded bytes representation of the object.
    #[pyo3(name = "to_msgpack_bytes")]
    fn py_to_msgpack_bytes(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
        self.to_msgpack_bytes()
            .map_err(to_pyvalue_err)?
            .into_py_any(py)
    }

    fn __reduce__(&self, py: Python) -> PyResult<Py<PyAny>> {
        let from_dict = py.get_type::<Self>().getattr("from_dict")?;
        let dict = self.py_to_dict(py)?;
        (from_dict, (dict,)).into_py_any(py)
    }
}

#[pymethods]
impl OrderBookDelta {
    #[staticmethod]
    #[pyo3(name = "from_json")]
    fn py_from_json(data: &[u8]) -> PyResult<Self> {
        Self::from_json_bytes(data).map_err(to_pyvalue_err)
    }

    #[staticmethod]
    #[pyo3(name = "from_msgpack")]
    fn py_from_msgpack(data: &[u8]) -> PyResult<Self> {
        Self::from_msgpack_bytes(data).map_err(to_pyvalue_err)
    }
}

#[cfg(test)]
mod tests {

    use rstest::rstest;

    use super::*;
    use crate::{
        data::stubs::*,
        enums::OrderSide,
        types::{Price, Quantity},
    };

    #[rstest]
    fn test_order_book_delta_py_new_with_zero_size_returns_error() {
        Python::initialize();
        Python::attach(|_py| {
            let instrument_id = InstrumentId::from("AAPL.XNAS");
            let action = BookAction::Add;
            let zero_size = Quantity::from(0);
            let price = Price::from("100.00");
            let side = OrderSide::Buy;
            let order_id = 123_456;
            let flags = 0;
            let sequence = 1;
            let ts_event = 1;
            let ts_init = 2;

            let order = BookOrder::new(side, price, zero_size, order_id);

            let result = OrderBookDelta::py_new(
                instrument_id,
                action,
                order,
                flags,
                sequence,
                ts_event,
                ts_init,
            );
            assert!(result.is_err());
        });
    }

    #[rstest]
    fn test_to_dict(stub_delta: OrderBookDelta) {
        let delta = stub_delta;

        Python::initialize();
        Python::attach(|py| {
            let dict_string = delta.py_to_dict(py).unwrap().to_string();
            let expected_string = "{'type': 'OrderBookDelta', 'instrument_id': 'AAPL.XNAS', 'action': 'ADD', 'order': {'side': 'BUY', 'price': '100.00', 'size': '10', 'order_id': 123456}, 'flags': 0, 'sequence': 1, 'ts_event': 1, 'ts_init': 2}";
            assert_eq!(dict_string, expected_string);
        });
    }

    #[rstest]
    fn test_from_dict(stub_delta: OrderBookDelta) {
        let delta = stub_delta;

        Python::initialize();
        Python::attach(|py| {
            let dict = delta.py_to_dict(py).unwrap();
            let parsed = OrderBookDelta::py_from_dict(py, dict).unwrap();
            assert_eq!(parsed, delta);
        });
    }
}