import os
from typing import Callable
from pathlib import Path
from PyQt6.QtGui import QAction, QIcon
from PyQt6.QtWidgets import QMenu, QFileDialog

from raven.pluginbase import PluginBase
from raven.pluginregistry import PluginRegistry
from raven.plugins.domain.menucontribution import MenuContribution
from raven.plugins.domain.raction import RAction
from raven.plugins.domain.rmenu import RMenu
from settings import Settings


class OpenFilePlugin(PluginBase):
    def __init__(self):
        super(OpenFilePlugin, self).__init__()
        self.settings = None
        self.tr = None

    def set_settings(self, settings: Settings):
        self.settings = settings

    def set_translator(self, tr: Callable[[str], str]):
        self.tr = tr

    def _action_open_file(self) -> RAction:
        open_file = RAction("&Open...", self._open_file_dialog, shortcut='Ctrl+O',
                            icon_from_theme="document-open")
        return open_file

    def _sub_menu_recent_files(self) -> RMenu:
        self._menu_recent_files = RMenu("Open &Recent")
        self._update_recent_files_menu()
        return self._menu_recent_files

    def get_menu_contributions(self) -> [MenuContribution]:
        return [
            MenuContribution("file", action=self._action_open_file(), action_id="open file"),
            MenuContribution("file", menu=self._sub_menu_recent_files(), action_id="recent files menu"),
        ]

    def _open_file_dialog(self) -> None:
        current_file = PluginRegistry.execute_single("current_file")
        directory = os.path.dirname(current_file) if current_file else os.path.join(Path.home())

        dialog = QFileDialog()
        (selected_file, _filter) = dialog.getOpenFileName(
            caption=self.tr("Open File"),
            directory=directory
        )
        if selected_file:
            self._open_file(selected_file)

    def _open_file(self, selected_file: str):
        tab = PluginRegistry.execute_single("create_tab", selected_file)
        if tab:
            PluginRegistry.execute_single("add_tab", tab)
            PluginRegistry.execute("after_open_file", selected_file)

    def _get_recent_files(self) -> [str]:
        recent_files = self.settings.session.get('general', 'recent_files', fallback='')
        # print(recent_files)
        files = recent_files.split(os.pathsep)
        if "" in files:
            files.remove("")
        return files

    def _update_recent_files_menu(self):
        self._menu_recent_files.clear()
        files = self._get_recent_files()
        for file in files:
            action = RAction(os.path.basename(file))
            action.set_action(lambda x, f=file: self._open_file(f))
            self._menu_recent_files.add_action(action)

    def _remember_recent_file(self, file: str):
        files = self._get_recent_files()
        if file in files:
            files.remove(file)
        files.insert(0, file)
        recent_files = os.pathsep.join(files[:10])
        self.settings.set_session('general', 'recent_files', recent_files)
        self._update_recent_files_menu()

    def after_open_file(self, file: str):
        self._remember_recent_file(file)