// 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, RefMut};

use std::convert::TryInto;

use cpython::{

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

    PyObject, PyResult, PySet, PyString, Python, PythonObject, ToPyObject,

    UnsafePyLeaked,

};

use crate::{

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

    dirstate::non_normal_entries::{

        NonNormalEntries, NonNormalEntriesIterator,

    },

    dirstate::owning::OwningDirstateMap,

    dirstate::{dirs_multiset::Dirs, make_dirstate_tuple},

    parsers::dirstate_parents_to_pytuple,

};

use hg::{

    dirstate::parsers::Timestamp,

    dirstate_tree::dispatch::DirstateMapMethods,

    errors::HgError,

    revlog::Node,

    utils::files::normalize_case,

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

    DirsMultiset, DirstateEntry, DirstateError,

    DirstateMap as RustDirstateMap, DirstateMapError, DirstateParents,

    EntryState, StateMapIter,

};

// 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| {

    @shared data inner: Box<dyn DirstateMapMethods + Send>;

    /// Returns a `(dirstate_map, parents)` tuple

    @staticmethod

    def new(

        use_dirstate_tree: bool,

        use_dirstate_v2: bool,

        on_disk: PyBytes,

    ) -> PyResult<PyObject> {

        let dirstate_error = |e: DirstateError| {

            PyErr::new::<exc::OSError, _>(py, format!("Dirstate error: {:?}", e))

        };

        let (inner, parents) = if use_dirstate_tree || use_dirstate_v2 {

            let (map, parents) =

                OwningDirstateMap::new(py, on_disk, use_dirstate_v2)

                .map_err(dirstate_error)?;

            (Box::new(map) as _, parents)

        } else {

            let bytes = on_disk.data(py);

            let mut map = RustDirstateMap::default();

            let parents = map.read(bytes).map_err(dirstate_error)?;

            (Box::new(map) as _, parents)

        };

        let map = Self::create_instance(py, inner)?;

        let parents = parents.map(|p| dirstate_parents_to_pytuple(py, &p));

        Ok((map, parents).to_py_object(py).into_object())

    }

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

        self.inner(py).borrow_mut().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(HgPath::new(key.data(py))) {

            Some(entry) => {

            },

            None => Ok(default)

        }

    }

    def addfile(

        &self,

        f: PyObject,

        oldstate: PyObject,

        state: PyObject,

        mode: PyObject,

        size: PyObject,

        mtime: PyObject

    ) -> PyResult<PyObject> {

        self.inner(py).borrow_mut().add_file(

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

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

                .try_into()

                .map_err(|e: HgError| {

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

                })?,

            DirstateEntry {

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

                    .try_into()

                    .map_err(|e: HgError| {

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

                    })?,

                mode: mode.extract(py)?,

                size: size.extract(py)?,

                mtime: mtime.extract(py)?,

            },

        ).and(Ok(py.None())).or_else(|e: DirstateMapError| {

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

        })

    }

    def removefile(

        &self,

        f: PyObject,

        oldstate: PyObject,

        size: PyObject

    ) -> PyResult<PyObject> {

        self.inner(py).borrow_mut()

            .remove_file(

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

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

                    .try_into()

                    .map_err(|e: HgError| {

                        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.inner(py).borrow_mut()

            .drop_file(

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

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

                    .try_into()

                    .map_err(|e: HgError| {

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

                    })?,

            )

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

            .or_else(|e| {

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

                    py,

                    format!("Dirstate error: {}", e.to_string()),

                ))

            })

    }

    def clearambiguoustimes(

        &self,

        files: PyObject,

        now: PyObject

    ) -> PyResult<PyObject> {

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

            .iter(py)?

            .map(|filename| {

                Ok(HgPathBuf::from_bytes(

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

                ))

            })

            .collect();

        self.inner(py).borrow_mut()

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

        Ok(py.None())

    }

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

        let mut inner_shared = self.inner(py).borrow_mut();

        let set = PySet::empty(py)?;

        for path in inner_shared.iter_other_parent_paths() {

            set.add(py, PyBytes::new(py, path.as_bytes()))?;

        }

        Ok(set.into_object())

    }

    def non_normal_entries(&self) -> PyResult<NonNormalEntries> {

        NonNormalEntries::from_inner(py, self.clone_ref(py))

    }

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

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

        Ok(self

            .inner(py)

            .borrow_mut()

            .non_normal_entries_contains(HgPath::new(key.data(py))))

    }

    def non_normal_entries_display(&self) -> PyResult<PyString> {

        Ok(

            PyString::new(

                py,

                &format!(

                    "NonNormalEntries: {}",

                    hg::utils::join_display(

                        self

                            .inner(py)

                            .borrow_mut()

                            .iter_non_normal_paths(),

                        ", "

                    )

                )

            )

        )

    }

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

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

        self

            .inner(py)

            .borrow_mut()

            .non_normal_entries_remove(HgPath::new(key.data(py)));

        Ok(py.None())

    }

    def non_normal_or_other_parent_paths(&self) -> PyResult<PyList> {

        let mut inner = self.inner(py).borrow_mut();

        let ret = PyList::new(py, &[]);

        for filename in inner.non_normal_or_other_parent_paths() {

            let as_pystring = PyBytes::new(py, filename.as_bytes());

            ret.append(py, as_pystring.into_object());

        }

        Ok(ret)

    }

    def non_normal_entries_iter(&self) -> PyResult<NonNormalEntriesIterator> {

        // Make sure the sets are defined before we no longer have a mutable

        // reference to the dmap.

        self.inner(py)

            .borrow_mut()

            .set_non_normal_other_parent_entries(false);

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

        NonNormalEntriesIterator::from_inner(py, unsafe {

            leaked_ref.map(py, |o| {

                o.iter_non_normal_paths_panic()

            })

        })

    }

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

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

        Ok(self.inner(py).borrow_mut()

            .has_tracked_dir(HgPath::new(d.data(py)))

            .map_err(|e| {

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

            })?

            .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(HgPath::new(d.data(py)))

            .map_err(|e| {

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

            })?

            .to_py_object(py))

    }

    def write(

        &self,

        use_dirstate_v2: bool,

        p1: PyObject,

        p2: PyObject,

        now: PyObject

    ) -> PyResult<PyBytes> {

        let now = Timestamp(now.extract(py)?);

        let parents = DirstateParents {

            p1: extract_node_id(py, &p1)?,

            p2: extract_node_id(py, &p2)?,

        };

        let mut inner = self.inner(py).borrow_mut();

        let result = if use_dirstate_v2 {

            inner.pack_v2(parents, now)

        } else {

            inner.pack_v1(parents, now)

        };

        match result {

            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 (path, entry) in self.inner(py).borrow_mut().iter() {

            if entry.state != EntryState::Removed {

                let key = normalize_case(path);

                let value = path;

                dict.set_item(

                    py,

                    PyBytes::new(py, key.as_bytes()).into_object(),

                    PyBytes::new(py, value.as_bytes()).into_object(),

                )?;