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//! IO operations for pattern and exception data provided by `hyph-UTF8`
//! and stored in the `patterns` folder.

use std::error;
use std::fmt;
use std::fs::File;
use std::io;
use std::path::{Path, PathBuf};
use std::sync::{RwLock};

use serde_json::{self as json};

use klpair::KLPair;
use language::{Corpus, Language, mins, tag};
use exception::{Exceptions};
use pattern::{Patterns};


lazy_static! {
    static ref PATTERN_FOLDER: RwLock<PathBuf> = RwLock::new(PathBuf::new());
}

/// Sets the folder where pattern and exception data are stored.
pub fn set_pattern_folder(path: &Path) {
    let mut folder = PATTERN_FOLDER.write().unwrap();

    folder.push(path);
}


pub fn data_file(lang: Language, suffix: &str) -> io::Result<File> {
    let fname = format!("hyph-{}.{}.json", tag(lang), suffix);
    let as_set = PATTERN_FOLDER.read().unwrap();
    let mut fpath = PathBuf::new();
    fpath.push(&*as_set);
    fpath.push(fname);

    File::open(fpath)
}


pub fn patterns(lang: Language) -> Result<Vec<KLPair>, Error> {
    let f = try!(data_file(lang, "pat"));
    let pairs: Vec<(String, Vec<u32>)> = try!(json::from_reader(f));

    Ok(pairs)
}

pub fn exceptions(lang: Language) -> Result<Vec<KLPair>, Error> {
    let f = try!(data_file(lang, "hyp"));
    let pairs: Vec<(String, Vec<u32>)> = try!(json::from_reader(f));

    Ok(pairs)
}

/// Constructs the default `Corpus` for a given language.
pub fn language(lang: Language) -> Result<Corpus, Error> {
    let (l, r) = mins(lang);
    let pat_pairs = try!(patterns(lang));
    let ex_pairs = try!(exceptions(lang));

    let mut ps = Patterns::empty();
    for p in pat_pairs {
        ps.insert(p);
    }

    let mut exs = Exceptions::empty();
    for ex in ex_pairs {
        exs.insert(ex);
    }

    Ok(Corpus {
        language: lang,
        patterns: ps,
        exceptions: if !exs.0.is_empty() { Some(exs) } else { None },
        left_min: l,
        right_min: r
    })
}


/// Failure modes of pattern loading.
#[derive(Debug)]
pub enum Error {
    IO(io::Error),
    Deserialization(json::Error)
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::IO(ref e) => e.fmt(f),
            Error::Deserialization(ref e) => e.fmt(f)
        }
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        match *self {
            Error::IO(ref e) => e.description(),
            Error::Deserialization(ref e) => e.description(),
        }
    }
}

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Error {
        Error::IO(err)
    }
}

impl From<json::Error> for Error {
    fn from(err: json::Error) -> Error {
        Error::Deserialization(err)
    }
}