// dirstate module

//

// 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.

use std::fmt;

use crate::dirstate::on_disk::DirstateV2ParseError;

use crate::errors;

use crate::revlog::node::NULL_NODE;

use crate::revlog::Node;

use crate::utils::hg_path::{HgPath, HgPathBuf, HgPathError};

use bytes_cast::BytesCast;

use entry::DirstateEntry;

pub mod dirs_multiset;

pub mod dirstate_map;

pub mod entry;

pub mod on_disk;

pub mod owning;

pub mod parsers;

pub mod path_with_basename;

pub mod status;

#[derive(Debug, PartialEq, Copy, Clone, BytesCast)]

#[repr(C)]

pub struct DirstateParents {

    pub p1: Node,

    pub p2: Node,

}

impl DirstateParents {

    pub const NULL: Self = Self {

        p1: NULL_NODE,

        p2: NULL_NODE,

    };

    pub fn is_merge(&self) -> bool {

        !(self.p2 == NULL_NODE)

    }

}

pub type StateMapIter<'a> = Box<

    dyn Iterator<

            Item = Result<(&'a HgPath, DirstateEntry), DirstateV2ParseError>,

        > + Send

        + 'a,

>;

pub type CopyMapIter<'a> = Box<

    dyn Iterator<Item = Result<(&'a HgPath, &'a HgPath), DirstateV2ParseError>>

        + Send

        + 'a,

>;

#[derive(Debug, PartialEq)]

pub enum DirstateMapError {

    PathNotFound(HgPathBuf),

    InvalidPath(HgPathError),

}

impl From<HgPathError> for DirstateMapError {

    fn from(error: HgPathError) -> Self {

        Self::InvalidPath(error)

    }

}

impl fmt::Display for DirstateMapError {

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

        match self {

            DirstateMapError::PathNotFound(_) => {

                f.write_str("expected a value, found none")

            }

            DirstateMapError::InvalidPath(path_error) => path_error.fmt(f),

        }

    }

}

#[derive(Debug, derive_more::From)]

pub enum DirstateError {

    Map(DirstateMapError),

    Common(errors::HgError),

}

impl From<HgPathError> for DirstateError {

    fn from(error: HgPathError) -> Self {

        Self::Map(DirstateMapError::InvalidPath(error))

    }

}

impl fmt::Display for DirstateError {

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

        match self {

            DirstateError::Map(error) => error.fmt(f),

            DirstateError::Common(error) => error.fmt(f),

        }

    }

}