from abc import ABC, abstractmethod
import configparser
import pathlib

class ToolchainProcessor(ABC):

    INDEX_FILENAME = "index.txt"
    CUSTOM_CHARACTER_SUBSTITUTIONS = [
        ("\u0080", "€"),
        ("\u0091", "‘"),
        ("\u0092", "’"),
        ("\u0093", "“"),
        ("\u0094", "”"),
        ("\u0095", "•"),
        ("\u0096", "–"),
        ("\u0097", "—"),
    ]

    def __init__(self, config_path, additional_tmx_args={}):
        config = configparser.ConfigParser(interpolation=configparser.ExtendedInterpolation())
        config.read(config_path)

        self.lang_src = config["Languages"]["srclang"]
        self.lang_tgt = config["Languages"]["tgtlang"]
        self.keep_unmatched_src = config.getboolean("Languages", "keep_unmatched_src", fallback=False)
        self.keep_unmatched_tgt = config.getboolean("Languages", "keep_unmatched_tgt", fallback=False)

        self.monolingual_filename_template_source = config.get("Output", "monolingual_filename_template_source")
        self.monolingual_filename_template_target = config.get("Output", "monolingual_filename_template_target")
        self.tmx_filename_template = config.get("Output", "parallel_filename_template")
        self.tmx_template = pathlib.Path(config["TMX"]["template"]).resolve()
        self.global_tmx_args = {
            "srclang" : self.lang_src,
            "tgtlang" : self.lang_tgt,
            "adminlang" : config["Languages"]["adminlang"],
            "datatype" : config["TMX"]["datatype"],
            "disclaimer" : config["TMX"]["disclaimer"],
            "distributor" : config["Common"]["project_name"],
            "segtype" : config["TMX"]["segtype"],
        }
        self.global_tmx_args.update(additional_tmx_args)

        self.abbreviations_paths = {}
        for lang, abbreviations_path in config["Abbreviations"].items():
            self.abbreviations_paths[lang] = abbreviations_path

        self.langdetect_config = config["Langdetect"]
        self.docalign_config = config["Docalign"]
        self.sentalign_config = config["Sentalign"]
        self.cleaner_config = config["TextCleaning"]
        self.extractor_config = config["TextExtraction"]


    @abstractmethod
    def process(self, id, input_dir, artefact_dir, output_dir):
        pass


    def create_directory(self, basedir, name):
        dir = basedir.joinpath(name)
        dir.mkdir(parents=True, exist_ok=True)
        return dir


    def create_file_info(self, linguality_type, languages, size, size_unit):
        file_info = {
            "linguality_type" : linguality_type,
            "languages" : languages,
            "size" : size,
            "size_unit" : size_unit,
            "encoding" : "utf8",
        }

        if linguality_type == "bilingual":
            file_info["multilinguality_type"] = "parallel"
            file_info["format"] = "application/x-tmx+xml"
        elif linguality_type == "monolingual":
            file_info["multilinguality_type"] = "not_applicable"
            file_info["format"] = "text/plain"

        return file_info