from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QWidget, QVBoxLayout, QGridLayout, QLabel, QScrollArea, QFrame

from core.context import AppContext
from widget.task_item import TaskItemFrame

class TaskListFrame(QFrame):
    def __init__(self, parent=None):
        super(TaskListFrame, self).__init__(parent)

        self.setStyleSheet("background-color: #15182b")

        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(0)

        self.content_widget = QWidget()
        self.content_widget_layout = QGridLayout(self.content_widget)
        self.content_widget_layout.setContentsMargins(10, 10, 20, 10)
        self.content_widget_layout.setSpacing(10)

        scroll_area = QScrollArea()
        scroll_area.setObjectName("taskArea")
        scroll_area.setWidgetResizable(True)
        scroll_area.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        scroll_area.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        scroll_area.setWidget(self.content_widget)
        layout.addWidget(scroll_area)

        AppContext.get_edge_context().get_component('dat_task').signals.on_receive_task.connect(self.init_ui)

    def showEvent(self, e):
        self.init_ui()

    def init_ui(self):
        task_table = AppContext.get_edge_context().get_component("dat_task")
        tasks = task_table.list_task(1)
        if len(tasks) == 0:
            return

        while self.content_widget_layout.count():
            item = self.content_widget_layout.takeAt(0)
            widget = item.widget()
            if widget is not None:
                widget.deleteLater()

        row = 0
        column = 0
        for task in tasks:
            task_item = TaskItemFrame(task, self.content_widget.geometry().height())
            self.content_widget_layout.addWidget(task_item, row, column, Qt.AlignTop)
            column += 1
            if column == 3:
                row += 1
                column = 0

        if column == 1 and row == 0:
            self.content_widget_layout.addWidget(QWidget(), 0, 1)
            self.content_widget_layout.addWidget(QWidget(), 0, 2)
        if column == 2 and row == 0:
            self.content_widget_layout.addWidget(QWidget(), 0, 2)