from pathlib import Path

import spacy
import typer
from spacy.tokens import DocBin
from wasabi import msg

DELIMITER = "-DOCSTART- -X- O O"


def spacy_to_iob(
    # fmt: off
    spacy_indir: Path = typer.Argument(..., help="Path to the directory containing the spaCy files."),
    iob_outdir: Path = typer.Argument(..., help="Path to the directory to save the IOB files."),
    lang: str = typer.Option("tl", "-l", "--lang", help="Language code for the spaCy vocab."),
    verbose: bool = typer.Option(False, "-v", "--verbose", help="Print additional information."),
    delimiter: str = typer.Option(DELIMITER, "-d", "--delimiter", help="Delimiter between examples.")
    # fmt: on
):
    """Convert spaCy files into IOB-formatted files."""
    nlp = spacy.blank(lang)
    for spacy_file in spacy_indir.glob(f"*.spacy"):
        msg.text(f"Converting {str(spacy_file)}", show=verbose)
        doc_bin = DocBin().from_disk(spacy_file)
        docs = doc_bin.get_docs(nlp.vocab)

        lines = []  # container for the IOB lines later on
        for doc in docs:
            lines.append(delimiter)
            lines.append("\n\n")
            for token in doc:
                label = (
                    f"{token.ent_iob_}-{token.ent_type_}"
                    if token.ent_iob_ != "O"
                    else "O"
                )
                line = f"{token.text}\t{label}"
                lines.append(line)
                lines.append("\n")
            lines.append("\n")

        iob_file = iob_outdir / f"{spacy_file.stem}.iob"
        with open(iob_file, "w", encoding="utf-8") as f:
            f.writelines(lines)

        msg.good(f"Saved to {iob_file}")


if __name__ == "__main__":
    typer.run(spacy_to_iob)