# coding: utf8
from __future__ import unicode_literals

import plac
from pathlib import Path

from .converters import conllu2json, iob2json
from ..util import prints

# Converters are matched by file extension. To add a converter, add a new entry
# to this dict with the file extension mapped to the converter function imported
# from /converters.

CONVERTERS = {
    '.conllu': conllu2json,
    '.conll': conllu2json,
    '.iob': iob2json
}


@plac.annotations(
    input_file=("input file", "positional", None, str),
    output_dir=("output directory for converted file", "positional", None, str),
    n_sents=("Number of sentences per doc", "option", "n", float),
    morphology=("Enable appending morphology to tags", "flag", "m", bool)
)
def convert(_, input_file, output_dir, n_sents, morphology):
    """Convert files into JSON format for use with train command and other
    experiment management functions.
    """
    input_path = Path(input_file)
    output_path = Path(output_dir)
    if not input_path.exists():
        prints(input_path, title="Input file not found", exits=1)
    if not output_path.exists():
        prints(output_path, title="Output directory not found", exits=1)
    file_ext = input_path.suffix
    if not file_ext in CONVERTERS:
        prints("Can't find converter for %s" % input_path.parts[-1],
               title="Unknown format", exits=1)
    CONVERTERS[file_ext](input_path, output_path,
            n_sents=n_sents, morphology=morphology)