#!/usr/bin/python3
from string import ascii_lowercase
import argparse
import itertools
import os
import re

import cmd2


from dictionary import DEFAULT, ALTERNATE
from word_remove_dialog import RemoveWordsActivity


LOWERCASE = set(ascii_lowercase)
DICTS = {"default": DEFAULT, "alt": ALTERNATE}
# argparsers
dictionary_manage_parser = argparse.ArgumentParser()
commands = dictionary_manage_parser.add_mutually_exclusive_group(required=True)
commands.add_argument(
    "-l", "--list", action="store_true", help="List available dictionaries"
)
commands.add_argument("-s", "--switch", help="Dictionary to swap to")

letter_set_manage = argparse.ArgumentParser()
letter_set_manage.add_argument("letter", nargs="+")

guessing = argparse.ArgumentParser()
guessing.add_argument("pattern", help="Pattern to match")

hide_exclude = argparse.ArgumentParser()
commands = hide_exclude.add_mutually_exclusive_group(required=True)
commands.add_argument(
    "-e",
    "--edit",
    help="Change which words will be hidden from view",
    action="store_true",
)
commands.add_argument(
    "-c", "--commit", help="Move excluded words to be hidden words", action="store_true"
)
commands.add_argument(
    "-s",
    "--show",
    help="Show which words are in the current exclude list",
    action="store_true",
)


def candidates(letters, min=2):
    possibilities = []
    for length in range(min, len(letters) + 1):
        for comb in itertools.combinations(letters, length):
            for perm in itertools.permutations(comb):
                word = "".join(perm)
                possibilities.append(word)
    return possibilities


class MainLoop(cmd2.Cmd):
    """Loop for wordscape commands

    """

    prompt = "<{}> $ "

    def __init__(self):
        self.dict = "default"
        self.excludes = set()
        self.hidden = set()
        self.init_letters(input("Enter letters: "))
        self._candidates = None
        self._in_dictionary = None
        super().__init__()

    def init_letters(self, letters):
        if not isinstance(letters, str):
            letters = "".join(letters)
        letters = letters.lower()
        self.letters = [l for l in letters if l in LOWERCASE]
        self.prompt = MainLoop.prompt.format(", ".join(self.letters))
        self._candidates = None
        self._in_dictionary = None

    @property
    def candidates(self):
        if self._candidates is None:
            self._candidates = candidates(self.letters)
        return self._candidates

    @property
    def in_dictionary(self):
        if self._in_dictionary is None:
            self._in_dictionary = DICTS[self.dict].filter(self.candidates)
        return self._in_dictionary

    def filter(self, regex):
        matching_pattern = filter(regex.match, self.candidates)
        return DICTS[self.dict].filter(matching_pattern)

    @cmd2.with_argparser(dictionary_manage_parser)
    def do_dict(self, args):
        """list/switch dict"""
        if args.list:
            print(
                "\n".join(
                    (
                        "{} {}".format("*" if key == self.dict else " ", key)
                        for key in DICTS.keys()
                    )
                )
            )
        else:
            DICTS[args.switch]
            self.dict = args.switch

    @cmd2.with_argparser(letter_set_manage)
    def do_change_letters(self, args):
        """Change the letters on the board"""
        self.init_letters(args.letter)

    @cmd2.with_argparser(guessing)
    def do_find(self, args):
        """Find words that match a pattern"""
        pattern = re.compile(args.pattern + "$")
        matching_words = self.filter(pattern)
        app = RemoveWordsActivity(matching_words - self.hidden, self.excludes)
        if os.name == "nt":
            app.run(fork=False)
        else:
            app.run()
        was_canceled, new_exludes = app.get_results()
        if not was_canceled:
            self.excludes.update(new_exludes)

    @cmd2.with_argparser(hide_exclude)
    def do_hide(self, args):
        """Hide words that are in the exclude list"""
        if args.show:
            print("\n".join(sorted(self.excludes)))
            return
        if args.commit:
            self.hidden.update(self.excludes)
            self.excludes = set()
            return
        if args.edit:
            app = RemoveWordsActivity(self.excludes, self.hidden)
            if os.name == "nt":
                app.run(fork=False)
            else:
                app.run()
            was_canceled, results = app.get_results()
            if not was_canceled:

                result_set = set(results)
                self.excludes = self.hidden - result_set
                self.hidden = result_set

            return


if __name__ == "__main__":
    MainLoop().cmdloop()