import urllib.parse

from datetime import datetime
from typing import Dict, Optional
from PyQt5.QtCore import QUrl
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QTabWidget
from config import Config


class InfoTabs(QTabWidget):
    """
    Class to manage info tabs
    """

    def __init__(self, parent=None) -> None:
        super().__init__(parent)

        # Dictionary to record when tabs were last updated (so we can
        # re-use the oldest one later)
        self.last_update: Dict[QWebEngineView, datetime] = {}

    def open_tab(self, title: str) -> None:
        """
        Open passed URL. Create new tab if we're below the maximum
        number otherwise reuse oldest content tab.
        """

        short_title = title[:Config.INFO_TAB_TITLE_LENGTH]

        if self.count() < Config.MAX_INFO_TABS:
            # Create a new tab
            widget = QWebEngineView()
            widget.setZoomFactor(Config.WEB_ZOOM_FACTOR)
            tab_index = self.addTab(widget, short_title)

        else:
            # Reuse oldest widget
            widget = min(self.last_update, key=self.last_update.get)
            tab_index = self.indexOf(widget)
            self.setTabText(tab_index, short_title)

        txt = urllib.parse.quote_plus(title)
        url = Config.INFO_TAB_URL % txt
        widget.setUrl(QUrl(url))
        self.last_update[widget] = datetime.now()

        # Show newly updated tab
        self.setCurrentIndex(tab_index)