// -------------------------------------------------------------------------------------------------
//  Copyright (C) 2015-2025 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::hash_map::DefaultHasher,
    ffi::CString,
    hash::{Hash, Hasher},
};

use nautilus_core::python::{IntoPyObjectNautilusExt, to_pyvalue_err};
use pyo3::{
    IntoPyObjectExt,
    prelude::*,
    pyclass::CompareOp,
    types::{PyString, PyTuple},
};

use crate::identifiers::trade_id::{TRADE_ID_LEN, TradeId};

#[pymethods]
impl TradeId {
    #[new]
    fn py_new(value: &str) -> PyResult<Self> {
        Self::new_checked(value).map_err(to_pyvalue_err)
    }

    fn __setstate__(&mut self, state: &Bound<'_, PyAny>) -> PyResult<()> {
        let py_tuple: &Bound<'_, PyTuple> = state.downcast::<PyTuple>()?;
        let binding = py_tuple.get_item(0)?;
        let value_str = binding.downcast::<PyString>()?.extract::<&str>()?;

        // TODO: Extract this to single function
        let c_string = CString::new(value_str).expect("`CString` conversion failed");
        let bytes = c_string.as_bytes_with_nul();
        let mut value = [0; TRADE_ID_LEN];
        value[..bytes.len()].copy_from_slice(bytes);
        self.value = value;

        Ok(())
    }

    fn __getstate__(&self, py: Python) -> PyResult<Py<PyAny>> {
        (self.to_string(),).into_py_any(py)
    }

    fn __reduce__(&self, py: Python) -> PyResult<Py<PyAny>> {
        let safe_constructor = py.get_type::<Self>().getattr("_safe_constructor")?;
        let state = self.__getstate__(py)?;
        (safe_constructor, PyTuple::empty(py), state).into_py_any(py)
    }

    #[staticmethod]
    fn _safe_constructor() -> Self {
        Self::from("NULL")
    }

    fn __richcmp__(&self, other: Py<PyAny>, op: CompareOp, py: Python<'_>) -> Py<PyAny> {
        if let Ok(other) = other.extract::<Self>(py) {
            match op {
                CompareOp::Eq => self.eq(&other).into_py_any_unwrap(py),
                CompareOp::Ne => self.ne(&other).into_py_any_unwrap(py),
                CompareOp::Ge => self.ge(&other).into_py_any_unwrap(py),
                CompareOp::Gt => self.gt(&other).into_py_any_unwrap(py),
                CompareOp::Le => self.le(&other).into_py_any_unwrap(py),
                CompareOp::Lt => self.lt(&other).into_py_any_unwrap(py),
            }
        } else {
            py.NotImplemented()
        }
    }

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

    fn __repr__(&self) -> String {
        format!("{}('{}')", stringify!(TradeId), self)
    }

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

    #[getter]
    fn value(&self) -> String {
        self.to_string()
    }

    #[staticmethod]
    #[pyo3(name = "from_str")]
    fn py_from_str(value: &str) -> PyResult<Self> {
        Self::new_checked(value).map_err(to_pyvalue_err)
    }
}
