import re
from PyQt5 import QtCore
from typing import NamedTuple, Optional

from model.task import ValidTaskForm
import gui.tasks.duration

class TaskFormEdition:
    def __init__(
            self,
            name,
            name_signal,
            description,
            description_signal,
            duration,
            duration_signal,
            tag,
            tag_signal):

        self._name = name
        self._description = description
        self._duration = duration
        self._tag = tag
        self._signal = ValidTaskFormSignal()

        name_signal.connect(lambda name: self.on_name_signal(name))
        description_signal.connect(lambda description: self.on_description_signal(description))
        duration_signal.connect(lambda duration: self.on_duration_signal(duration))
        tag_signal.connect(lambda tag: self.on_tag_signal(tag))

    def get(self) -> Optional[ValidTaskForm]:
        name = self._name.strip()
        description = self._description.strip()
        duration = gui.tasks.duration.parse(self._duration)
        tag = self._tag.strip()

        if name and duration != None:
            return ValidTaskForm(
                name = name,
                description = description,
                duration = duration,
                tag = tag)
        else:
            return None

    def on_name_signal(self, name: str):
        self._name = name
        self.emit()

    def on_description_signal(self, description: str):
        self._description = description
        self.emit()

    def on_duration_signal(self, duration: str):
        self._duration = duration
        self.emit()

    def on_tag_signal(self, tag: str):
        self._tag = tag
        self.emit()

    def emit(self):
        validForm = self.get()
        if validForm:
            self._signal.emit(validForm)

    def signal(self):
        return self._signal

class ValidTaskFormSignal(QtCore.QObject):
    _signal = QtCore.pyqtSignal(ValidTaskForm, name = 'validTaskForm')

    def __init__(self):
        QtCore.QObject.__init__(self)

    def emit(self, form: Optional[ValidTaskForm]):
        self._signal.emit(form)

    def connect(self, f):
        self._signal.connect(f)