import os
import datetime
from datetime import datetime as dt
import base64

import requests

from load import config


def date_parser_helper(days:int, parse:str="%d.%m.20%y"):
    return dt.strftime(
            dt.now() +
            datetime.timedelta(days=days),
            parse
        )

'''
self.months = {
    1: "січень",
    2: "лютий",
    3: "березень",
    4: "квітень",
    5: "травень",
    6: "червень",
    7: "липень",
    8: "серпень",
    9: "вересень",
    10: "жовтень",
    11: "листопад",
    12: "грудень"
}
'''

class Helper():

    def __init__(self):
        self.date_now = date_parser_helper(0)
        self.date_next = date_parser_helper(1)
        self.weekend_pass = date_parser_helper(2)
        self.two_day_pass = date_parser_helper(3)

        self.black_list = [
            'черговий викладач',
            self.date_now,
            self.date_next,
            self.weekend_pass,
            self.two_day_pass
        ]

    @staticmethod
    def find_with_table(document):
        c_element = 2
        while True:
            try:
                document['body']["content"][c_element]["table"]["rows"]
                break
            except KeyError:
                c_element += 1
                if c_element > 15:
                    return False
            except IndexError:
                return False

        with open("{}/table_element.txt".format(config.config_folder), 'w') as f:
            f.write(str(c_element))
            f.close()
        return c_element

    def find_with_text(self, document):
        format_charset = '-'
        alternative_format_charset = "\t"
        element = 4
        data = []
        text = ''

        while element < 15:
            doc = (
                document['body']["content"][element]
                ["paragraph"]["elements"][0]["textRun"]["content"]
            ).rstrip("\n").replace("–", "-", 1)
            if (
                (
                    ("-" in doc)
                    #and
                    #("\t" not in doc)
                )
                and
                ([p not in doc.lower() for p in self.black_list][0])
            ):
                try:
                    group, text = doc.split(format_charset)
                except ValueError:
                    if element > 6:
                        break
            else:
                try:
                    group, text = doc.split(alternative_format_charset)
                except ValueError:
                    if element > 6:
                        break
            if text != '':
                data.append(
                    (group.strip(" "), text.lstrip(" ").replace("\t", ""))
                )
            element += 1
        return data

    def get_date(self, document):
        date_element = 1
        while date_element < 16:
            try:
                date = (
                document['body']["content"][date_element]
                ["paragraph"]["elements"][0]["textRun"]["content"]
                .rstrip(" \n"))
            except:
                date_element += 1
            if (
                (
                    (
                        self.date_now in date.lower()
                        .lstrip("заміни").lstrip("на").replace(" ", "")
                    )
                    or
                    (
                        self.date_next in date.lower()
                        .lstrip("заміни").lstrip("на").replace(" ", "")
                    )
                    or
                    (
                        self.weekend_pass in date.lower()
                        .lstrip("заміни").lstrip("на").replace(" ", "")
                    )
                    or
                    (
                        self.two_day_pass in date.lower()
                        .lstrip("заміни").lstrip("на").replace(" ", "")
                    )
                )
                or 
                (
                    "заміни на" in date.lower()
                )
            ):
                return date
            else:
                date_element += 1

        return False

    @staticmethod
    def get_table_element():
        if os.path.exists(f"{config.config_folder}/table_element.txt"):
            element = int(
                open(
                    f"{config.config_folder}/table_element.txt",
                    'r'
                    )
                .read()
            )
        else:
            element = 6
        return element

    @staticmethod
    def teacher(document):
        element = 1
        while element < 6:
            if "paragraph" in document['body']["content"][element]:
                length_element = (len(document['body']["content"][element]
                    ["paragraph"]["elements"]))

                doc = (
                    document['body']["content"][element]["paragraph"]["elements"]
                    [0]["textRun"]["content"].rstrip("\n")
                )
                if 'черговий викладач' in doc.lower().replace("–", ""):
                    return doc

                elif length_element > 1:
                    for p in range(length_element):
                        doc = (
                            document['body']["content"][element]
                            ["paragraph"]["elements"]
                            [p]["textRun"]["content"].rstrip("\n")
                        )
                        if 'черговий викладач' in doc.lower().replace("–", ""):
                            return doc

            element += 1
            
        
    @classmethod
    def get_link_and_download(cls, id_doc, document):
        if "inlineObjects" in document:
            if id_doc in document['inlineObjects']:
                link = (document
                    ['inlineObjects'][id_doc]['inlineObjectProperties']
                    ['embeddedObject']['imageProperties']['contentUri'])
                r = requests.get(link, stream=True)
                return base64.b64encode(r.content).decode('utf-8')
    
    @classmethod
    def find_image(cls, document):
        for i in document['body']["content"]:
            if ("paragraph" in i) and ("elements" in i["paragraph"]):
                if "inlineObjectElement" in i["paragraph"]["elements"][0]:
                    return True, cls.get_link_and_download(
                        i["paragraph"]["elements"][0]
                        ['inlineObjectElement']['inlineObjectId'], document)
        return False, None