import logging
import os
import pipes
import platform
import shlex
import subprocess
from pathlib import Path
from typing import Dict

from colorama import Fore
from PySide2 import QtCore, QtGui, QtWidgets

if platform.system() == "Linux":
    from xdg.DesktopEntry import DesktopEntry

from ..logic import DangerzoneCore
from ..settings import Settings
from ..util import get_resource_path

log = logging.getLogger(__name__)


class DangerzoneGui(DangerzoneCore):
    """
    Singleton of shared state / functionality for the GUI and core app logic
    """

    def __init__(self, app: QtWidgets.QApplication) -> None:
        super().__init__()

        # Qt app
        self.app = app

        # Only one output dir is supported in the GUI
        self.output_dir: str = ""

        # Preload font
        self.fixed_font = QtGui.QFontDatabase.systemFont(QtGui.QFontDatabase.FixedFont)

        # Preload list of PDF viewers on computer
        self.pdf_viewers = self._find_pdf_viewers()

        # Are we done waiting (for Docker Desktop to be installed, or for container to install)
        self.is_waiting_finished = False

    def get_window_icon(self) -> QtGui.QIcon:
        if platform.system() == "Windows":
            path = get_resource_path("dangerzone.ico")
        else:
            path = get_resource_path("icon.png")
        return QtGui.QIcon(path)

    def open_pdf_viewer(self, filename: str) -> None:
        if platform.system() == "Darwin":
            # Open in Preview
            args = ["open", "-a", "Preview.app", filename]

            # Run
            args_str = " ".join(pipes.quote(s) for s in args)
            log.info(Fore.YELLOW + "> " + Fore.CYAN + args_str)
            subprocess.run(args)

        elif platform.system() == "Windows":
            os.startfile(Path(filename))  # type: ignore [attr-defined]

        elif platform.system() == "Linux":
            # Get the PDF reader command
            args = shlex.split(self.pdf_viewers[self.settings.get("open_app")])
            # %f, %F, %u, and %U are filenames or URLS -- so replace with the file to open
            for i in range(len(args)):
                if (
                    args[i] == "%f"
                    or args[i] == "%F"
                    or args[i] == "%u"
                    or args[i] == "%U"
                ):
                    args[i] = filename

            # Open as a background process
            args_str = " ".join(pipes.quote(s) for s in args)
            log.info(Fore.YELLOW + "> " + Fore.CYAN + args_str)
            subprocess.Popen(args)

    def _find_pdf_viewers(self) -> Dict[str, str]:
        pdf_viewers: Dict[str, str] = {}
        if platform.system() == "Linux":
            # Find all .desktop files
            for search_path in [
                "/usr/share/applications",
                "/usr/local/share/applications",
                os.path.expanduser("~/.local/share/applications"),
            ]:
                try:
                    for filename in os.listdir(search_path):
                        full_filename = os.path.join(search_path, filename)
                        if os.path.splitext(filename)[1] == ".desktop":

                            # See which ones can open PDFs
                            desktop_entry = DesktopEntry(full_filename)
                            if (
                                "application/pdf" in desktop_entry.getMimeTypes()
                                and desktop_entry.getName() != "dangerzone"
                            ):
                                pdf_viewers[
                                    desktop_entry.getName()
                                ] = desktop_entry.getExec()

                except FileNotFoundError:
                    pass

        return pdf_viewers


class Alert(QtWidgets.QDialog):
    def __init__(
        self,
        dangerzone: DangerzoneGui,
        message: str,
        ok_text: str = "Ok",
        has_cancel: bool = True,
        extra_button_text: str = None,
    ) -> None:
        super(Alert, self).__init__()
        self.dangerzone = dangerzone

        self.setWindowTitle("dangerzone")
        self.setWindowIcon(self.dangerzone.get_window_icon())
        self.setModal(True)

        flags = (
            QtCore.Qt.CustomizeWindowHint
            | QtCore.Qt.WindowTitleHint
            | QtCore.Qt.WindowSystemMenuHint
            | QtCore.Qt.WindowCloseButtonHint
            | QtCore.Qt.WindowStaysOnTopHint
        )
        self.setWindowFlags(flags)

        logo = QtWidgets.QLabel()
        logo.setPixmap(
            QtGui.QPixmap.fromImage(QtGui.QImage(get_resource_path("icon.png")))
        )

        label = QtWidgets.QLabel()
        label.setText(message)
        label.setWordWrap(True)

        message_layout = QtWidgets.QHBoxLayout()
        message_layout.addWidget(logo)
        message_layout.addSpacing(10)
        message_layout.addWidget(label, stretch=1)

        ok_button = QtWidgets.QPushButton(ok_text)
        ok_button.clicked.connect(self.clicked_ok)
        if extra_button_text:
            extra_button = QtWidgets.QPushButton(extra_button_text)
            extra_button.clicked.connect(self.clicked_extra)

        buttons_layout = QtWidgets.QHBoxLayout()
        buttons_layout.addStretch()
        buttons_layout.addWidget(ok_button)
        if extra_button_text:
            buttons_layout.addWidget(extra_button)
        if has_cancel:
            cancel_button = QtWidgets.QPushButton("Cancel")
            cancel_button.clicked.connect(self.clicked_cancel)
            buttons_layout.addWidget(cancel_button)

        layout = QtWidgets.QVBoxLayout()
        layout.addLayout(message_layout)
        layout.addSpacing(10)
        layout.addLayout(buttons_layout)
        self.setLayout(layout)

    def clicked_ok(self) -> None:
        self.done(QtWidgets.QDialog.Accepted)

    def clicked_extra(self) -> None:
        self.done(2)

    def clicked_cancel(self) -> None:
        self.done(QtWidgets.QDialog.Rejected)

    def launch(self) -> int:
        return self.exec_()