import json
import os
import shutil
from collections import OrderedDict

import regex as re
from ruamel.yaml import RoundTripLoader

from dateparser_scripts.order_languages import avoid_languages
from dateparser_scripts.utils import combine_dicts

cldr_date_directory = '../dateparser_data/cldr_language_data/date_translation_data/'
supplementary_directory = '../dateparser_data/supplementary_language_data/'
supplementary_date_directory = '../dateparser_data/supplementary_language_data/date_translation_data/'
translation_data_directory = '../dateparser/data/'
date_translation_directory = '../dateparser/data/date_translation_data/'

os.chdir(os.path.dirname(os.path.abspath(__file__)))

cldr_languages = list(set(map(lambda x: x[:-5], os.listdir(cldr_date_directory))) - avoid_languages)
supplementary_languages = [x[:-5] for x in os.listdir(supplementary_date_directory)]
all_languages = set(cldr_languages).union(set(supplementary_languages))

RELATIVE_PATTERN = re.compile(r'\{0\}')


def _modify_relative_data(relative_data):
    modified_relative_data = OrderedDict()
    for key, value in relative_data.items():
        for i, string in enumerate(value):
            string = RELATIVE_PATTERN.sub(r'(\\d+)', string)
            value[i] = string
        modified_relative_data[key] = value
    return modified_relative_data


def _modify_data(language_data):
    relative_data = language_data.get("relative-type-regex", {})
    relative_data = _modify_relative_data(relative_data)
    locale_specific_data = language_data.get("locale_specific", {})
    for _, info in locale_specific_data.items():
        locale_relative_data = info.get("relative-type-regex", {})
        locale_relative_data = _modify_relative_data(locale_relative_data)


def _get_complete_date_translation_data(language):
    cldr_data = {}
    supplementary_data = {}
    if language in cldr_languages:
        with open(cldr_date_directory + language + '.json') as f:
            cldr_data = json.load(f, object_pairs_hook=OrderedDict)
    if language in supplementary_languages:
        with open(supplementary_date_directory + language + '.yaml') as g:
            supplementary_data = OrderedDict(RoundTripLoader(g).get_data())
    complete_data = combine_dicts(cldr_data, supplementary_data)
    if 'name' not in complete_data:
        complete_data['name'] = language
    return complete_data


def _write_file(filename, text, mode, in_memory, in_memory_result):
    if in_memory:
        in_memory_result[filename] = text
    else:
        with open(filename, mode) as out:
            out.write(text)


def write_complete_data(in_memory=False):
    """
    This function is responsible of generating the needed py files from the
    CLDR files (JSON format) and supplementary language data (YAML format).

    Use it with in_memory=True to avoid writing real files and getting a
    dictionary containing the file names and their content (used when testing).
    """
    in_memory_result = {}

    if not in_memory:
        if not os.path.isdir(translation_data_directory):
            os.mkdir(translation_data_directory)
        if os.path.isdir(date_translation_directory):
            shutil.rmtree(date_translation_directory)
        os.mkdir(date_translation_directory)

    with open(supplementary_directory + 'base_data.yaml') as f:
        base_data = RoundTripLoader(f).get_data()

    for language in all_languages:
        date_translation_data = _get_complete_date_translation_data(language)
        date_translation_data = combine_dicts(date_translation_data, base_data)
        _modify_data(date_translation_data)
        translation_data = json.dumps(date_translation_data, indent=4, separators=(',', ': '),
                                      ensure_ascii=False)
        out_text = ('info = ' + translation_data + '\n').encode('utf-8')
        _write_file(date_translation_directory + language + '.py', out_text, 'wb', in_memory, in_memory_result)

    init_text = (
        "from dateparser.data import date_translation_data\n"
        "from .languages_info import language_order, language_locale_dict\n"
    )

    _write_file(translation_data_directory + '__init__.py', init_text, 'w', False, in_memory_result)
    _write_file(date_translation_directory + '__init__.py', '', 'w', False, in_memory_result)

    return in_memory_result


if __name__ == '__main__':
    write_complete_data()
