# Standard library imports
import datetime as dt
from typing import Dict, Optional

# PyQt imports
from PyQt6.QtCore import QUrl
from PyQt6.QtWebEngineWidgets import QWebEngineView
from PyQt6.QtWidgets import QTabWidget, QWidget

# Third party imports

# App imports
from config import Config


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

    def __init__(self, parent: Optional[QWidget] = None) -> None:
        super().__init__(parent)

        if Config.USE_INTERNAL_BROWSER:
            # re-use the oldest one later)
            self.last_update: Dict[QWebEngineView, dt.datetime] = {}
            self.tabtitles: Dict[int, str] = {}

            # Create one tab which (for some reason) creates flickering if
            # done later
            widget = QWebEngineView()
            widget.setZoomFactor(Config.WEB_ZOOM_FACTOR)
            self.last_update[widget] = dt.datetime.now()
            _ = self.addTab(widget, "")

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

        if url in self.tabtitles.values():
            self.setCurrentIndex(
                list(self.tabtitles.keys())[list(self.tabtitles.values()).index(url)]
            )
            return

        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)  # type: ignore
            tab_index = self.indexOf(widget)
            self.setTabText(tab_index, short_title)

        widget.setUrl(QUrl(url))
        self.last_update[widget] = dt.datetime.now()
        self.tabtitles[tab_index] = url

        # Show newly updated tab
        self.setCurrentIndex(tab_index)