from PyQt5 import QtCore
from typing import Optional

from model.tag import ValidTagForm

class TagFormEdition:
    def __init__(
            self,
            name,
            name_signal,
            color,
            color_signal):

        self._name = name
        self._color = color
        self._signal = ValidTagFormSignal()

        name_signal.connect(lambda n: self.on_name_signal(n))
        color_signal.connect(lambda d: self.on_color_signal(d))

    def get(self) -> Optional[ValidTagForm]:
        name = self._name.strip()
        color = self._color.strip()

        if name and color:
            return ValidTagForm(
                name = name,
                color = color)
        else:
            return None

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

    def on_color_signal(self, color: str):
        self._color = color
        self.emit()

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

    def signal(self):
        return self._signal

class ValidTagFormSignal(QtCore.QObject):
    _signal = QtCore.pyqtSignal(ValidTagForm, name = 'validTagForm')

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

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

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