//

// 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.

//! `hg-core` package.

//!

use cpython::{

};

use hg::{

    pack_dirstate, parse_dirstate, CopyVecEntry, DirstateEntry,

};

use std::collections::HashMap;

fn parse_dirstate_wrapper(

    py: Python,

    dmap: PyDict,

    copymap: PyDict,

    st: PyBytes,

) -> PyResult<PyTuple> {

    match parse_dirstate(st.data(py)) {

        Ok((parents, dirstate_vec, copies)) => {

            for (filename, entry) in dirstate_vec {

                dmap.set_item(

                    py,

                    PyBytes::new(py, &filename[..]),

                    decapsule_make_dirstate_tuple(py)?(

                        entry.state as c_char,

                        entry.mode,

                        entry.size,

                        entry.mtime,

                    ),

                )?;

            }

            for CopyVecEntry { path, copy_path } in copies {

                copymap.set_item(

                    py,

                    PyBytes::new(py, path),

                    PyBytes::new(py, copy_path),

                )?;

            }

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

                .to_py_object(py))

        }

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

            py,

            match e {

                DirstateParseError::TooLittleData => {

                    "too little data for parents".to_string()

                }

                DirstateParseError::Overflow => {

                    "overflow in dirstate".to_string()

                }

                DirstateParseError::CorruptedEntry(e) => e,

            },

        )),

    }

}

fn pack_dirstate_wrapper(

    py: Python,

    dmap: PyDict,

    copymap: PyDict,

    pl: PyTuple,

    now: PyInt,

) -> PyResult<PyBytes> {

    let p1 = pl.get_item(py, 0).extract::<PyBytes>(py)?;

    let p1: &[u8] = p1.data(py);

    let p2 = pl.get_item(py, 1).extract::<PyBytes>(py)?;

    let p2: &[u8] = p2.data(py);

    let dirstate_vec = extract_dirstate_vec(py, &dmap)?;

    let copies: Result<HashMap<Vec<u8>, Vec<u8>>, PyErr> = copymap

        .items(py)

        .iter()

        .map(|(key, value)| {

            Ok((

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

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

            ))

        })

        .collect();

    match pack_dirstate(

        &dirstate_vec,

        &copies?,

        DirstateParents { p1, p2 },

        now.as_object().extract::<i32>(py)?,

    ) {

        Ok((packed, new_dirstate_vec)) => {

            for (

                filename,

                DirstateEntry {

                    state,

                    mode,

                    size,

                    mtime,

                },

            ) in new_dirstate_vec

            {

                dmap.set_item(

                    py,

                    PyBytes::new(py, &filename[..]),

                    decapsule_make_dirstate_tuple(py)?(

                        state as c_char,

                        mode,

                        size,

                        mtime,

                    ),

                )?;

            }

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

        }

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

            py,

            match error {

                DirstatePackError::CorruptedParent => {

                    "expected a 20-byte hash".to_string()

                }

                DirstatePackError::CorruptedEntry(e) => e,

                DirstatePackError::BadSize(expected, actual) => {

                    format!("bad dirstate size: {} != {}", actual, expected)

                }

            },

        )),

    }

}

/// Create the module, with `__package__` given from parent

    let m = PyModule::new(py, dotted_name)?;

    m.add(py, "__package__", package)?;

    m.add(

        py,

        "parse_dirstate",

        py_fn!(

            py,

            parse_dirstate_wrapper(dmap: PyDict, copymap: PyDict, st: PyBytes)

        ),

    )?;

    m.add(

        py,

        "pack_dirstate",

        py_fn!(

            py,

            pack_dirstate_wrapper(

                dmap: PyDict,

                copymap: PyDict,

                pl: PyTuple,

                now: PyInt

            )

        ),

    )?;

    let sys = PyModule::import(py, "sys")?;

    let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;

    sys_modules.set_item(py, dotted_name, &m)?;

    Ok(m)

}