import re
import jsgf

class Nlu:
    def __init__(self):
        with open('rules.jsgf', 'r', encoding='utf-8') as f:
            lines = f.readlines()
        self.rules_grammar = jsgf.parse_grammar_string("".join(lines))
        self.acts = {
            "request": {
                'triggers': ['jak', 'kiedy'],
                'parameters': ['imie']
            }
        }


    def get_slots(self, expansion, slots):
        if expansion.tag != '':
            slots.append((expansion.tag, expansion.current_match))
            return

        for child in expansion.children:
            self.get_slots(child, slots)

        if not expansion.children and isinstance(expansion, jsgf.NamedRuleRef):
            self.get_slots(expansion.referenced_rule.expansion, slots)
    
    def get_dialog_act(self, rule):
        slots = []
        self.get_slots(rule.expansion, slots)
        return {'act': rule.grammar.name, 'slots': slots}


    def tokenize(self, string):
        clean_string = self.get_str_cleaned(string)

        matched = self.rules_grammar.find_matching_rules(clean_string)

        if matched:
            return self.get_dialog_act(matched[0])
        else:
            return {'act': 'null', 'slots': []}


    def get_str_cleaned(self, str_dirty):
        punctuation = '!"#$%&\'()*+,-./:;<=>?@[\\\\]^_`{|}~'
        new_str = str_dirty.lower()
        new_str = re.sub(' +', ' ', new_str)

        for char in punctuation:
            new_str = new_str.replace(char,'')

        return new_str

    # TODO: Refactor


        return (act, param)

nlu = Nlu()
print(nlu.tokenize('chciałbym kupić bilet do Krakow'))
print(nlu.tokenize('chciałbym kupić bilet z Poznan'))
print(nlu.tokenize('w piątek'))
print(nlu.tokenize('4 bilety'))
print(nlu.tokenize('2 bilety z ulgą studencką'))
print(nlu.tokenize('miejsce pod oknem'))
print(nlu.tokenize('druga klasa'))