#!/usr/bin/python3
import argparse
from string import ascii_lowercase
import cmd2
import re
import os

from candidates import candidates, filter_possibilities
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()
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")


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

    """

    prompt = "<{}> $ "

    def __init__(self):
        self.dict = "default"
        self.excludes = set()
        self.init_letters(input("Enter letters: "))
        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 = candidates(self.letters, DICTS[self.dict], self.excludes)

    @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 = filter_possibilities(self.candidates, pattern)
        app = RemoveWordsActivity(matching_words, 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)


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