import csv
from pathlib import Path
from typing import List, Dict, Tuple, Optional

from .constants import *
from .pytex_formatter import PyTeXFormatter
from ..logger import logger
from .formatting_config import FormattingConfig


class DictFormatter(PyTeXFormatter):
    def __init__(self, *args, **kwargs):
        super(DictFormatter, self).__init__(*args, **kwargs)
        with open(self.input_file, 'r') as file:
            line = file.readline()
            parts = [entry.strip() for entry in line.split(',')]
            if not len(parts) >= 1:
                raise NotImplementedError
            if not parts[0] == DICTIONARY_KEY_COLUMN_NAME:
                raise NotImplementedError
            self._languages = parts[1:]
        self._dict_name = self.input_file.name.split('.')[0]
        self._translations = None

    @property
    def dependencies(self) -> List[str]:
        return []  # No dependencies for dictionaries

    @property
    def translations(self) -> Dict:
        if self._translations is None:
            self._translations = self.parse()
        return self._translations

    @property
    def output_files(self) -> List[str]:
        return [
            DICTIONARY_NAMING_PATTERN.format(
                dict_name=self._dict_name,
                language=language
            )
            for language in self._languages
        ]

    def parse(self) -> Dict:
        with open(self.input_file, newline='') as csvfile:
            spamreader = csv.reader(csvfile, delimiter=',', quotechar='|')
            next(spamreader)  # Skip languages line
            translations: Dict = {}
            for language in self._languages:
                translations[language] = {}
            for line in spamreader:
                if not len(line) == len(self._languages) + 1:
                    raise NotImplementedError  # Invalid file format
                for n in range(1, len(line)):
                    translations[self._languages[n-1]][line[0]] = line[n]
        return translations

    def format(self, build_dir: Path, overwrite: bool = False) -> List[Tuple[str, FormattingConfig]]:
        build_dir.mkdir(parents=True, exist_ok=True)
        self.make_header()  # TODO: add kwargs
        for language in self._languages:
            lines: List[str] = [self.make_header(), '']
            lines += r'\ProvidesDictionary{{{dict_name}}}{{{language}}}'.format(
                dict_name=self._dict_name,
                language=language
            )
            lines += ['\n'] * 2
            for key in self.translations[language].keys():
                if self.translations[language][key].strip() != '':
                    lines += r'\providetranslation{{{key}}}{{{translation}}}'.format(
                        key=key.strip(),
                        translation=self.translations[language][key].strip()
                    )
                    lines += '\n'
                else:
                    logger.warning(
                        'Empty translation key found in {filename}'.format(
                            filename=self.input_file.name
                        )
                    )
            output_file = build_dir / DICTIONARY_NAMING_PATTERN.format(
                language=language,
                dict_name=self._dict_name
            )
            if not overwrite and output_file.exists():
                raise NotImplementedError
            else:
                output_file.write_text(
                    ''.join(lines)
                )
                logger.info(
                    f'Successfully wrote dictionary file {output_file.name}.'
                )
        return []  # No future configuration needed