import logging
import os
import re
from pprint import pprint
from typing import Tuple, Optional, List, Dict

import discord

from bot import exceptions, constants

logger = logging.getLogger(__file__)
logger.setLevel(constants.LOGGING_LEVEL)


class Card(object):
    _suits = {'H': 'Hearts', 'S': 'Spades', 'C': 'Clubs', 'D': 'Diamonds'}
    _symbols = {'10': 'Ten', '9': 'Nine', '8': 'Eight', '7': 'Seven', '6': 'Six', '5': 'Five', '4': 'Four',
                '3': 'Three',
                '2': 'Two', 'k': 'King', 'q': 'Queen', 'j': 'Jack', 'a': 'Ace'}

    EMOTE_REGEX = re.compile(r'<:([A-z0-9]+):\d+>')
    VALUE_PATTERN = re.compile(r'Value: (?:Soft )?(\d+)')

    def __init__(self, card: str) -> None:
        if 4 <= len(card) <= 1:
            raise exceptions.InvalidCard(f'By length, {card} is invalid. Identifiers are 2 to 3 characters long.')

        self.raw_card = card
        self.symbol, self.suit = self.parts()

    @property
    def value(self, safe: bool = True, unsafe_default: int = 0) -> int:
        """
        Attempts to determine the numerical value of the card.

        Aces and unknown cards will raise an exception, unless the safe boolean is set to False.
        """
        if self.isAce():
            if safe:
                raise exceptions.NoAceValue(
                    'The Ace has multiple values (1 and 11) in Blackjack. Special handling is required.')
            return 0
        elif self.isFace():
            return 10
        elif self.isNumerical():
            return int(self.symbol)
        elif safe:
            raise exceptions.IndetermineValue('Could not determine the numeric value of this card.')
        return unsafe_default

    def isAce(self) -> bool:
        """Returns whether or not the card is a Ace card."""
        return self.symbol == 'a'

    def isNumerical(self) -> bool:
        """Returns whether or not the card is numerical (not face or ace)."""
        return self.symbol.isnumeric()

    def isFace(self) -> bool:
        """Returns whether or not the card is a face card (Queen, King, or Jack)"""
        return self.symbol in ['q', 'k', 'j']

    def parts(self) -> Tuple[str, str]:
        """
        Separates the raw card identifier into it's symbol and suit.
        Handles aces, face cards and numerical cards with any of the four suites.
        """
        match = re.match(r'^(\d{1,2}|[aqkj])([cdhs])$', self.raw_card, flags=re.IGNORECASE)
        return match.group(1), match.group(2)

    @classmethod
    def parse_cards(cls, card_str: discord.embeds.EmbedProxy) -> Tuple[int, List['Card']]:
        """Given a EmbedProxy relating to a Blackjack Embed, finds a returns a list of Card objects and the value."""
        card_matches = re.finditer(cls.EMOTE_REGEX, card_str.value)
        value = re.search(cls.VALUE_PATTERN, card_str.value)

        cards = []
        for card in card_matches:
            identifier = card.group(1)
            if identifier != 'cardBack':
                cards.append(Card(identifier))

        return int(value.group(1)), cards

    def __repr__(self) -> str:
        return f'Card({self._symbols[self.symbol]} of {self._suits[self.suit]})'


def generate_table_structure(filename: str, column_keys: List[str], row_keys: List[str]) -> Dict[Tuple[str, str], str]:
    data = {}
    logger.debug(f'Generating table structure with {filename}')
    with open(os.path.join(constants.STATIC_DIR, filename)) as hard_file:
        raw_data = [list(line) for line in hard_file.read().split('\n') if len(line) > 0]
    for x, col_key in enumerate(column_keys):
        for y, row_key in enumerate(row_keys):
            data[(col_key, row_key)] = raw_data[y][x]
    return data


class Blackjack(object):
    # The row and column headers for the hair, soft and pair baseline tables.
    hard_column = ['2', '3', '4', '5', '6', '7', '8', '9', 'T', 'A']
    hard_row = ['20', '19', '18', '17', '16', '15', '14', '13', '12', '11', '10', '9', '8', '7', '6', '5']
    soft_column = ['2', '3', '4', '5', '6', '7', '8', '9', 'T', 'A']
    soft_row = ['A-9', 'A-8', 'A-7', 'A-6', 'A-5', 'A-4', 'A-3', 'A-2']
    pair_column = ['2', '3', '4', '5', '6', '7', '8', '9', 'T', 'A']
    pair_row = ['A-A', 'T-T', '9-9', '8-8', '7-7', '6-6', '5-5', '4-4', '3-3', '2-2']

    hard_data = generate_table_structure('baseline_hard.dat', hard_column, hard_row)
    soft_data = generate_table_structure('baseline_soft.dat', soft_column, soft_row)
    pair_data = generate_table_structure('baseline_pairs.dat', pair_column, pair_row)

    HARD = 0
    SOFT = 1
    PAIR = 2

    @staticmethod
    def choose(options: Tuple[bool, bool, bool, bool], cards: Tuple[str, Optional[str], Tuple[int, bool]],
               dealer: Tuple[str, Optional[str], Tuple[int, bool]]) -> str:
        """With all information presented, calculates the final decision."""

    def get_ideal_choice(self, cards: List[Card],
                         dealer: Tuple[str, Optional[str], Tuple[int, bool]]) -> str:
        """Gets the ideal baseline strategy choice based on my cards and the bot's cards."""

    def options_convert(self, choice: str, options: Tuple[bool, bool, bool, bool]):
        """Converts the choice to the best possible choice based on the options given by the bot."""

    @classmethod
    def access(cls, table: int, key: Tuple[str, str]) -> str:
        """
        Access table data given a column and row key.

        :param key:
        :param table:
        :return:
        """
        if table == cls.HARD: return cls.hard_data[key]
        if table == cls.SOFT: return cls.soft_data[key]
        if table == cls.PAIR: return cls.pair_data[key]