// dirstate_map.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::dirstate_map` file provided by the

//! `hg-core` package.

use std::cell::RefCell;

use std::convert::TryInto;

use std::time::Duration;

use cpython::{

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

    PyResult, PyTuple, Python, PythonObject, ToPyObject,

};

use libc::c_char;

use crate::{

    dirstate::copymap::{CopyMap, CopyMapItemsIterator, CopyMapKeysIterator},

    dirstate::{decapsule_make_dirstate_tuple, dirs_multiset::Dirs},

    ref_sharing::PySharedState,

};

use hg::{

    DirstateMap as RustDirstateMap, DirstateParents, DirstateParseError,

    EntryState,

};

// TODO

//     This object needs to share references to multiple members of its Rust

//     inner struct, namely `copy_map`, `dirs` and `all_dirs`.

//     Right now `CopyMap` is done, but it needs to have an explicit reference

//     to `RustDirstateMap` which itself needs to have an encapsulation for

//     every method in `CopyMap` (copymapcopy, etc.).

//     This is ugly and hard to maintain.

//     The same logic applies to `dirs` and `all_dirs`, however the `Dirs`

//     `py_class!` is already implemented and does not mention

//     `RustDirstateMap`, rightfully so.

//     All attributes also have to have a separate refcount data attribute for

//     leaks, with all methods that go along for reference sharing.

py_class!(pub class DirstateMap |py| {

    data inner: RefCell<RustDirstateMap>;

    data py_shared_state: PySharedState;

    def __new__(_cls, _root: PyObject) -> PyResult<Self> {

        let inner = RustDirstateMap::default();

        Self::create_instance(

            py,

            RefCell::new(inner),

            PySharedState::default()

        )

    }

    def clear(&self) -> PyResult<PyObject> {

        self.borrow_mut(py)?.clear();

        Ok(py.None())

    }

    def get(

        &self,

        key: PyObject,

        default: Option<PyObject> = None

    ) -> PyResult<Option<PyObject>> {

        let key = key.extract::<PyBytes>(py)?;

        match self.inner(py).borrow().get(key.data(py)) {

            Some(entry) => {

                // Explicitly go through u8 first, then cast to

                // platform-specific `c_char`.

                let state: u8 = entry.state.into();

                Ok(Some(decapsule_make_dirstate_tuple(py)?(

                        state as c_char,

                        entry.mode,

                        entry.size,

                        entry.mtime,

                    )))

            },

            None => Ok(default)

        }

    }

    def addfile(

        &self,

        f: PyObject,

        oldstate: PyObject,

        state: PyObject,

        mode: PyObject,

        size: PyObject,

        mtime: PyObject

    ) -> PyResult<PyObject> {

        self.borrow_mut(py)?.add_file(

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

            oldstate.extract::<PyBytes>(py)?.data(py)[0]

                .try_into()

                .map_err(|e: DirstateParseError| {

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

                })?,

            DirstateEntry {

                state: state.extract::<PyBytes>(py)?.data(py)[0]

                    .try_into()

                    .map_err(|e: DirstateParseError| {

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

                    })?,

                mode: mode.extract(py)?,

                size: size.extract(py)?,

                mtime: mtime.extract(py)?,

            },

        );

        Ok(py.None())

    }

    def removefile(

        &self,

        f: PyObject,

        oldstate: PyObject,

        size: PyObject

    ) -> PyResult<PyObject> {

        self.borrow_mut(py)?

            .remove_file(

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

                oldstate.extract::<PyBytes>(py)?.data(py)[0]

                    .try_into()

                    .map_err(|e: DirstateParseError| {

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

                    })?,

                size.extract(py)?,

            )

            .or_else(|_| {

                Err(PyErr::new::<exc::OSError, _>(

                    py,

                    "Dirstate error".to_string(),

                ))

            })?;

        Ok(py.None())

    }

    def dropfile(

        &self,

        f: PyObject,

        oldstate: PyObject

    ) -> PyResult<PyBool> {

        self.borrow_mut(py)?

            .drop_file(

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

                oldstate.extract::<PyBytes>(py)?.data(py)[0]

                    .try_into()

                    .map_err(|e: DirstateParseError| {

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

                    })?,

            )

            .and_then(|b| Ok(b.to_py_object(py)))

            .or_else(|_| {

                Err(PyErr::new::<exc::OSError, _>(

                    py,

                    "Dirstate error".to_string(),

                ))

            })

    }

    def clearambiguoustimes(

        &self,

        files: PyObject,

        now: PyObject

    ) -> PyResult<PyObject> {

        let files: PyResult<Vec<Vec<u8>>> = files

            .iter(py)?

            .map(|filename| {

                Ok(filename?.extract::<PyBytes>(py)?.data(py).to_owned())

            })

            .collect();

        self.inner(py)

            .borrow_mut()

            .clear_ambiguous_times(files?, now.extract(py)?);

        Ok(py.None())

    }

    // TODO share the reference

    def nonnormalentries(&self) -> PyResult<PyObject> {

        let (non_normal, other_parent) =

            self.inner(py).borrow().non_normal_other_parent_entries();

        let locals = PyDict::new(py);

        locals.set_item(

            py,

            "non_normal",

            non_normal

                .iter()

                .map(|v| PyBytes::new(py, &v))

                .collect::<Vec<PyBytes>>()

                .to_py_object(py),

        )?;

        locals.set_item(

            py,

            "other_parent",

            other_parent

                .iter()

                .map(|v| PyBytes::new(py, &v))

                .collect::<Vec<PyBytes>>()

                .to_py_object(py),

        )?;

        py.eval("set(non_normal), set(other_parent)", None, Some(&locals))

    }

    def hastrackeddir(&self, d: PyObject) -> PyResult<PyBool> {

        let d = d.extract::<PyBytes>(py)?;

        Ok(self

            .inner(py)

            .borrow_mut()

            .has_tracked_dir(d.data(py))

            .to_py_object(py))

    }

    def hasdir(&self, d: PyObject) -> PyResult<PyBool> {

        let d = d.extract::<PyBytes>(py)?;

        Ok(self

            .inner(py)

            .borrow_mut()

            .has_dir(d.data(py))

            .to_py_object(py))

    }

    def parents(&self, st: PyObject) -> PyResult<PyTuple> {

        self.inner(py)

            .borrow_mut()

            .parents(st.extract::<PyBytes>(py)?.data(py))

            .and_then(|d| {

                Ok((PyBytes::new(py, &d.p1), PyBytes::new(py, &d.p2))

                    .to_py_object(py))

            })

            .or_else(|_| {

                Err(PyErr::new::<exc::OSError, _>(

                    py,

                    "Dirstate error".to_string(),

                ))

            })

    }

    def setparents(&self, p1: PyObject, p2: PyObject) -> PyResult<PyObject> {

        self.inner(py)

            .borrow_mut()

            .set_parents(DirstateParents { p1, p2 });

        Ok(py.None())

    }

    def read(&self, st: PyObject) -> PyResult<Option<PyObject>> {

        match self

            .inner(py)

            .borrow_mut()

            .read(st.extract::<PyBytes>(py)?.data(py))

        {

            Ok(Some(parents)) => Ok(Some(

                (PyBytes::new(py, &parents.p1), PyBytes::new(py, &parents.p2))

                    .to_py_object(py)

                    .into_object(),

            )),

            Ok(None) => Ok(Some(py.None())),

            Err(_) => Err(PyErr::new::<exc::OSError, _>(

                py,

                "Dirstate error".to_string(),

            )),

        }

    }

    def write(

        &self,

        p1: PyObject,

        p2: PyObject,

        now: PyObject

    ) -> PyResult<PyBytes> {

        let now = Duration::new(now.extract(py)?, 0);

        let parents = DirstateParents {

        };

        match self.borrow_mut(py)?.pack(parents, now) {

            Ok(packed) => Ok(PyBytes::new(py, &packed)),

            Err(_) => Err(PyErr::new::<exc::OSError, _>(

                py,

                "Dirstate error".to_string(),

            )),

        }

    }

    def filefoldmapasdict(&self) -> PyResult<PyDict> {

        let dict = PyDict::new(py);

        for (key, value) in

            self.borrow_mut(py)?.build_file_fold_map().iter()

        {

            dict.set_item(py, key, value)?;

        }

        Ok(dict)

    }

    def __len__(&self) -> PyResult<usize> {

        Ok(self.inner(py).borrow().len())

    }

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

        let key = key.extract::<PyBytes>(py)?;

        Ok(self.inner(py).borrow().contains_key(key.data(py)))

    }

    def __getitem__(&self, key: PyObject) -> PyResult<PyObject> {

        let key = key.extract::<PyBytes>(py)?;

        let key = key.data(py);

        match self.inner(py).borrow().get(key) {

            Some(entry) => {

                // Explicitly go through u8 first, then cast to

                // platform-specific `c_char`.

                let state: u8 = entry.state.into();

                Ok(decapsule_make_dirstate_tuple(py)?(

                        state as c_char,

                        entry.mode,

                        entry.size,

                        entry.mtime,

                    ))

            },

            None => Err(PyErr::new::<exc::KeyError, _>(

                py,

                String::from_utf8_lossy(key),

            )),

        }

    }

    def keys(&self) -> PyResult<DirstateMapKeysIterator> {

        DirstateMapKeysIterator::from_inner(

            py,

            Some(DirstateMapLeakedRef::new(py, &self)),

            Box::new(self.leak_immutable(py)?.iter()),

        )

    }

    def items(&self) -> PyResult<DirstateMapItemsIterator> {

        DirstateMapItemsIterator::from_inner(

            py,

            Some(DirstateMapLeakedRef::new(py, &self)),

            Box::new(self.leak_immutable(py)?.iter()),

        )

    }