from PyQt5 import QtWidgets, QtCore, QtGui
from typing import Optional, Tuple, List, Any

from todo.model.tag import Tag, ValidTagForm
import todo.gui.icon
import todo.gui.tags.panel.form.state
import todo.gui.color
from todo.util.gui.color_input import ColorInput

def widget(
        parent: QtWidgets.QWidget,
        action_title: str,
        tag: Tag,
        on_validated,
        on_cancel):

    widget = QtWidgets.QWidget(parent)
    layout = QtWidgets.QVBoxLayout(widget)
    widget.setLayout(layout)

    grid = QtWidgets.QWidget(widget)
    layout.addWidget(grid)
    grid_layout = QtWidgets.QGridLayout(grid)
    grid.setLayout(grid_layout)

    init_name = tag.name if tag is not None else ""
    name_input = line_edit(grid, grid_layout, 0, "Nom", init_name)

    init_color = tag.color if tag is not None else "#FFFFFF"
    color_input = color_edit(grid, grid_layout, 1, "Couleur", QtGui.QColor(init_color))

    tag_form_edition = todo.gui.tags.panel.form.state.TagFormEdition(
            init_name,
            name_input.textChanged,
            init_color,
            color_input.textChanged)

    def on_validate():
        form = tag_form_edition.get()
        if form:
            on_validated(form)

    layout.addWidget(buttons(
            parent = widget,
            action_title = action_title,
            tag_form_signal = tag_form_edition.signal(),
            on_validate = on_validate,
            on_cancel = on_cancel))

    return widget

def line_edit(
        parent,
        layout: QtWidgets.QGridLayout,
        n: int,
        label: str,
        default_value: str) -> QtWidgets.QLineEdit:

    label = QtWidgets.QLabel(label, parent)
    layout.addWidget(label, n, 0)

    edit = QtWidgets.QLineEdit(parent)
    if default_value != None:
        edit.setText(default_value)
    layout.addWidget(edit, n, 1)

    return edit

def color_edit(
        parent,
        layout: QtWidgets.QGridLayout,
        n: int,
        label: str,
        init_color: QtGui.QColor) -> QtWidgets.QLineEdit:

    label = QtWidgets.QLabel(label, parent)
    layout.addWidget(label, n, 0)

    edit = ColorInput(init_color, parent)
    layout.addWidget(edit, n, 1)

    return edit

def buttons(parent, action_title, tag_form_signal, on_validate, on_cancel):
    widget = QtWidgets.QWidget(parent)
    layout = QtWidgets.QHBoxLayout(widget)

    validate = QtWidgets.QPushButton(action_title, widget)
    validate.setDisabled(True)
    validate.setIcon(todo.gui.icon.dialog_ok(validate.style()))
    validate.clicked.connect(on_validate);
    layout.addWidget(validate)

    def on_tag_form_signal(form: Optional[ValidTagForm]):
        if form:
            validate.setEnabled(True)
        else:
            validate.setDisabled(True)

    tag_form_signal.connect(on_tag_form_signal)

    cancel = QtWidgets.QPushButton("Annuler", widget)
    cancel.setIcon(todo.gui.icon.dialog_cancel(cancel.style()))
    cancel.clicked.connect(on_cancel)
    layout.addWidget(cancel)

    return widget