// Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net>

//           and Mercurial contributors

//

// 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, DirsMultisetIter},

    dirstate_map::DirstateMap,

    parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},

    CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,

    StateMap, StateMapIter,

};

mod filepatterns;

pub mod matchers;

pub mod revlog;

pub use revlog::*;

#[cfg(feature = "with-re2")]

pub mod re2;

pub mod utils;

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

pub use filepatterns::{

    parse_pattern_syntax, read_pattern_file, IgnorePattern,

    PatternFileWarning, PatternSyntax,

};

use std::collections::HashMap;

use twox_hash::RandomXxHashBuilder64;

pub type LineNumber = usize;

/// Rust's default hasher is too slow because it tries to prevent collision

/// attacks. We are not concerned about those: if an ill-minded person has

/// write access to your repository, you have other issues.

pub type FastHashMap<K, V> = HashMap<K, V, RandomXxHashBuilder64>;

#[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(HgPathBuf),

    EmptyPath,

    InvalidPath(HgPathError),

}

impl ToString for DirstateMapError {

    fn to_string(&self) -> String {

        match self {

            DirstateMapError::PathNotFound(_) => {

                "expected a value, found none".to_string()

            }

            DirstateMapError::EmptyPath => "Overflow in dirstate.".to_string(),

            DirstateMapError::InvalidPath(e) => e.to_string(),

        }

    }

}

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 {

    Path(HgPathError),

    UnsupportedSyntax(String),

    UnsupportedSyntaxInFile(String, String, usize),

    TooLong(usize),

    IO(std::io::Error),

    /// Needed a pattern that can be turned into a regex but got one that

    /// can't. This should only happen through programmer error.

    NonRegexPattern(IgnorePattern),

    /// This is temporary, see `re2/mod.rs`.

    /// This will cause a fallback to Python.

    Re2NotInstalled,

}

impl ToString for PatternError {

    fn to_string(&self) -> String {

        match self {

            PatternError::UnsupportedSyntax(syntax) => {

                format!("Unsupported syntax {}", syntax)

            }

            PatternError::UnsupportedSyntaxInFile(syntax, file_path, line) => {

                format!(

                    "{}:{}: unsupported syntax {}",

                    file_path, line, syntax

                )

            }

            PatternError::TooLong(size) => {

                format!("matcher pattern is too long ({} bytes)", size)

            }

            PatternError::IO(e) => e.to_string(),

            PatternError::Path(e) => e.to_string(),

            PatternError::NonRegexPattern(pattern) => {

                format!("'{:?}' cannot be turned into a regex", pattern)

            }

            PatternError::Re2NotInstalled => {

                "Re2 is not installed, cannot use regex functionality."

                    .to_string()

            }

        }

    }

}

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)

    }

}

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

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

        PatternError::IO(e)

    }

}

impl From<HgPathError> for PatternError {

    fn from(e: HgPathError) -> Self {

        PatternError::Path(e)

    }

}