// Copyright 2018 Georges Racinet <gracinet@anybox.fr>

//

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

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

mod ancestors;

pub mod dagops;

pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};

mod dirstate;

pub mod discovery;

pub mod testing; // unconditionally built, for use from integration tests

pub use dirstate::{

    dirs_multiset::DirsMultiset,

    parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},

    CopyMap, DirsIterable, DirstateEntry, DirstateParents, EntryState,

    StateMap,

};

mod filepatterns;

pub mod utils;

pub use filepatterns::{

    build_single_regex, read_pattern_file, PatternSyntax, PatternTuple,

};

/// Mercurial revision numbers

///

/// As noted in revlog.c, revision numbers are actually encoded in

/// 4 bytes, and are liberally converted to ints, whence the i32

pub type Revision = i32;

/// Marker expressing the absence of a parent

///

/// Independently of the actual representation, `NULL_REVISION` is guaranteed

/// to be smaller that all existing revisions.

pub const NULL_REVISION: Revision = -1;

/// Same as `mercurial.node.wdirrev`

///

/// This is also equal to `i32::max_value()`, but it's better to spell

/// it out explicitely, same as in `mercurial.node`

pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;

/// The simplest expression of what we need of Mercurial DAGs.

pub trait Graph {

    /// Return the two parents of the given `Revision`.

    ///

    /// Each of the parents can be independently `NULL_REVISION`

    fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;

}

pub type LineNumber = usize;

#[derive(Clone, Debug, PartialEq)]

pub enum GraphError {

    ParentOutOfRange(Revision),

    WorkingDirectoryUnsupported,

}

#[derive(Clone, Debug, PartialEq)]

pub enum DirstateParseError {

    TooLittleData,

    Overflow,

    CorruptedEntry(String),

    Damaged,

}

impl From<std::io::Error> for DirstateParseError {

    fn from(e: std::io::Error) -> Self {

        DirstateParseError::CorruptedEntry(e.to_string())

    }

}

impl ToString for DirstateParseError {

    fn to_string(&self) -> String {

        use crate::DirstateParseError::*;

        match self {

            TooLittleData => "Too little data for dirstate.".to_string(),

            Overflow => "Overflow in dirstate.".to_string(),

            CorruptedEntry(e) => format!("Corrupted entry: {:?}.", e),

            Damaged => "Dirstate appears to be damaged.".to_string(),

        }

    }

}

#[derive(Debug, PartialEq)]

pub enum DirstatePackError {

    CorruptedEntry(String),

    CorruptedParent,

    BadSize(usize, usize),

}

impl From<std::io::Error> for DirstatePackError {

    fn from(e: std::io::Error) -> Self {

        DirstatePackError::CorruptedEntry(e.to_string())

    }

}

#[derive(Debug, PartialEq)]

pub enum DirstateMapError {

    PathNotFound(Vec<u8>),

    EmptyPath,

}

pub enum DirstateError {

    Parse(DirstateParseError),

    Pack(DirstatePackError),

    Map(DirstateMapError),

    IO(std::io::Error),

}

impl From<DirstateParseError> for DirstateError {

    fn from(e: DirstateParseError) -> Self {

        DirstateError::Parse(e)

    }

}

impl From<DirstatePackError> for DirstateError {

    fn from(e: DirstatePackError) -> Self {

        DirstateError::Pack(e)

    }

}

#[derive(Debug)]

pub enum PatternError {

    UnsupportedSyntax(String),

}

#[derive(Debug)]

pub enum PatternFileError {

    IO(std::io::Error),

    Pattern(PatternError, LineNumber),

}

impl From<std::io::Error> for PatternFileError {

    fn from(e: std::io::Error) -> Self {

        PatternFileError::IO(e)

    }

}

impl From<DirstateMapError> for DirstateError {

    fn from(e: DirstateMapError) -> Self {

        DirstateError::Map(e)

    }

}

impl From<std::io::Error> for DirstateError {

    fn from(e: std::io::Error) -> Self {

        DirstateError::IO(e)

    }

}