// dirs_multiset.rs

//

// Copyright 2019 Raphaël Gomès <rgomes@octobus.net>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

//! Bindings for the `hg::dirstate::dirs_multiset` file provided by the

//! `hg-core` package.

use std::cell::RefCell;

use cpython::{

    exc, ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyObject, PyResult,

    Python, UnsafePyLeaked,

};

use hg::{

    utils::hg_path::{HgPath, HgPathBuf},

    DirsMultiset, DirsMultisetIter,

};

py_class!(pub class Dirs |py| {

    @shared data inner: DirsMultiset;

    // `map` is either a `dict` or a flat iterator (usually a `set`, sometimes

    // a `list`)

    def __new__(

        _cls,

        map: PyObject,

    ) -> PyResult<Self> {

        let inner = if map.cast_as::<PyDict>(py).is_ok() {

            let err = "pathutil.dirs() with a dict should only be used by the Python dirstatemap \

                and should not be used when Rust is enabled";

            return Err(PyErr::new::<exc::TypeError, _>(py, err.to_string()))

        } else {

            let map: Result<Vec<HgPathBuf>, PyErr> = map

                .iter(py)?

                .map(|o| {

                    Ok(HgPathBuf::from_bytes(

                        o?.extract::<PyBytes>(py)?.data(py),

                    ))

                })

                .collect();

            DirsMultiset::from_manifest(&map?)

                .map_err(|e| {

                    PyErr::new::<exc::ValueError, _>(py, e.to_string())

                })?

        };

        Self::create_instance(py, inner)

    }

    def addpath(&self, path: PyObject) -> PyResult<PyObject> {

        self.inner(py).borrow_mut().add_path(

            HgPath::new(path.extract::<PyBytes>(py)?.data(py)),

                        py,

                        e.to_string(),

    }

    def delpath(&self, path: PyObject) -> PyResult<PyObject> {

        self.inner(py).borrow_mut().delete_path(

            HgPath::new(path.extract::<PyBytes>(py)?.data(py)),

        )

            .and(Ok(py.None()))

                            py,

                            e.to_string(),

    }

    def __iter__(&self) -> PyResult<DirsMultisetKeysIterator> {

        let leaked_ref = self.inner(py).leak_immutable();

        DirsMultisetKeysIterator::from_inner(

            py,

            unsafe { leaked_ref.map(py, |o| o.iter()) },

        )

    }

    def __contains__(&self, item: PyObject) -> PyResult<bool> {

        Ok(self.inner(py).borrow().contains(HgPath::new(

            item.extract::<PyBytes>(py)?.data(py),

        )))

    }

});

impl Dirs {

    pub fn from_inner(py: Python, d: DirsMultiset) -> PyResult<Self> {

        Self::create_instance(py, d)

    }

    fn translate_key(

        py: Python,

        res: &HgPathBuf,

    ) -> PyResult<Option<PyBytes>> {

        Ok(Some(PyBytes::new(py, res.as_bytes())))

    }

}

py_shared_iterator!(

    DirsMultisetKeysIterator,

    UnsafePyLeaked<DirsMultisetIter<'static>>,

    Dirs::translate_key,

    Option<PyBytes>

);