"""Exceptions used for the vial solver."""
from collections import Counter

class InvalidVial(Exception):
    """Raised when an invalid vial is initialized."""
    def __init__(self, balls, size):
        self.message = "The vial you tried to initialize is not possible."
        self.message += f"\n(balls: {balls}, size: {size})"
        super().__init__(self.message)

class InvalidGame(Exception):
    """Raised when an invalid game is initialized."""
    def __init__(self, vial_string):
        self.message = "The game you tried to initialize is not possible."
        self.message += f"\n(input string: {vial_string})"

        count = Counter(list(vial_string.replace(" ", "")))
        count_counter = Counter(list(count.values()))
        if 1 in count_counter.values():
            wrong_letter = list(count.keys())[
                list(count.values()).index(list(count_counter.keys())[
                    list(count_counter.values()).index(1)
                ])
            ]
            pointers = ' '*len("(input string: ")
            indices = [index for index, value in enumerate(list(vial_string))
                       if value == wrong_letter]
            for i, index in enumerate(indices):
                if i > 0:
                    index -= indices[i-1]+1

                pointers += ' '*index + "^"
            self.message += "\n"+pointers
        super().__init__(self.message)

class NoSolutions(Exception):
    """Raised when an invalid game is initialized."""
    def __init__(self):
        self.message = "There are no valid solutions for the game."
        super().__init__(self.message)

class VialFull(Exception):
    """Raised when a full vial is pushed to."""
    def __init__(self, balls, size):
        self.message = "The vial you tried to push to is already full."
        self.message += f"\n(balls: {balls}, size: {size})"
        super().__init__(self.message)

class VialEmpty(Exception):
    """Raised when an empty vial is popped."""
    def __init__(self, balls, size):
        self.message = "The vial you tried to pull from is empty."
        self.message += f"\n(balls: {balls}, size: {size})"
        super().__init__(self.message)

class HeapEmpty(Exception):
    """Raised when extract_min() is tried on an empty heap."""
    def __init__(self):
        self.message = "The heap you tried to extract from is empty."
        super().__init__(self.message)