from typing import Optional

from PySide6.QtWidgets import QWidget, QTabWidget, QVBoxLayout

from raven.pluginregistry import PluginRegistry
from raven.plugins.ravenlog.Tab import Tab
from settings import Settings


class Tabs(QWidget):
    def __init__(self, settings: Settings):
        super(Tabs, self).__init__()

        self.settings = settings

        self.tabs = QTabWidget()
        self.tabs.setTabsClosable(True)
        self.tabs.setMovable(True)
        self.tabs.tabCloseRequested.connect(self._close_tab)
        self.tabs.currentChanged.connect(self._current_tab_changed)

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

        self.layout.addWidget(self.tabs)

    def add_tab(self, tab: Tab):
        # if tab already exists then open it
        for tab_index in range(0, self.tabs.count()):
            widget: Tab = self.tabs.widget(tab_index)
            if widget.unique_id == tab.unique_id:
                self.tabs.setCurrentIndex(tab_index)
                return

        tab_index = self.tabs.addTab(tab, tab.title)
        self.tabs.setCurrentIndex(tab_index)

    def _current_tab_changed(self, tab_index: int):
        tab: Tab = self.tabs.widget(tab_index)
        if tab:
            PluginRegistry.execute("update_window_title", tab.title)
            PluginRegistry.execute("update_status_bar", tab.get_status_text())
        else:
            PluginRegistry.execute("update_window_title", "")
            PluginRegistry.execute("update_status_bar", "")

    def _close_tab(self, tab_index: int):
        full_tab: Tab = self.tabs.widget(tab_index)
        full_tab.destruct()
        self.tabs.removeTab(tab_index)

    def destruct(self):
        while self.tabs.count() > 0:
            self._close_tab(0)

    def _current_tab(self) -> int:
        return self.tabs.currentIndex()

    def current_file(self) -> Optional[str]:
        if self.tabs.currentIndex() < 0:
            return None

        tab: Tab = self.tabs.widget(self.tabs.currentIndex())
        return tab.get_file()