"""GUI for the Sinara 8451 Thermostat"""

import asyncio
import logging
import argparse
import importlib.resources
from PyQt6 import QtWidgets, QtGui, uic
from PyQt6.QtCore import pyqtSlot
import qasync
from qasync import asyncSlot, asyncClose
from pytec.gui.model.thermostat import Thermostat, ThermostatConnectionState
from pytec.gui.view.zero_limits_warning_view import ZeroLimitsWarningView
from pytec.gui.view.thermostat_settings_menu import ThermostatSettingsMenu
from pytec.gui.view.connection_details_menu import ConnectionDetailsMenu
from pytec.gui.view.info_box import InfoBox


def get_argparser():
    parser = argparse.ArgumentParser(description="Thermostat Control Panel")

    parser.add_argument(
        "--connect",
        default=None,
        action="store_true",
        help="Automatically connect to the specified Thermostat in host:port format",
    )
    parser.add_argument("host", metavar="HOST", default=None, nargs="?")
    parser.add_argument("port", metavar="PORT", default=None, nargs="?")
    parser.add_argument(
        "-l",
        "--log",
        dest="logLevel",
        choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
        help="Set the logging level",
    )

    return parser


class MainWindow(QtWidgets.QMainWindow):
    NUM_CHANNELS = 2

    def __init__(self):
        super().__init__()

        ui_file_path = importlib.resources.files("pytec.gui.view").joinpath("tec_qt.ui")
        uic.loadUi(ui_file_path, self)

        self._info_box = InfoBox()

        # Models
        self._thermostat = Thermostat(self, self.report_refresh_spin.value())
        self._connecting_task = None
        self._thermostat.connection_state_update.connect(
            self._on_connection_state_changed
        )

        @pyqtSlot()
        def handle_connection_error():
            self._info_box.display_info_box(
                "Connection Error", "Thermostat connection lost. Is it unplugged?"
            )

        self._thermostat.connection_error.connect(handle_connection_error)

        # Bottom bar menus
        self.connection_details_menu = ConnectionDetailsMenu(
            self._thermostat, self.connect_btn
        )
        self.connect_btn.setMenu(self.connection_details_menu)

        self._thermostat_settings_menu = ThermostatSettingsMenu(
            self._thermostat, self._info_box, self.style()
        )
        self.thermostat_settings.setMenu(self._thermostat_settings_menu)

        # Status line
        self._zero_limits_warning_view = ZeroLimitsWarningView(
            self._thermostat, self.style(), self.limits_warning
        )
        self.loading_spinner.hide()

        self.report_apply_btn.clicked.connect(
            lambda: self._thermostat.set_update_s(self.report_refresh_spin.value())
        )

    @asyncClose
    async def closeEvent(self, _event):
        try:
            await self._thermostat.end_session()
            self._thermostat.connection_state = ThermostatConnectionState.DISCONNECTED
        except:
            pass

    @pyqtSlot(ThermostatConnectionState)
    def _on_connection_state_changed(self, state):
        self.graph_group.setEnabled(state == ThermostatConnectionState.CONNECTED)
        self.thermostat_settings.setEnabled(
            state == ThermostatConnectionState.CONNECTED
        )
        self.report_group.setEnabled(state == ThermostatConnectionState.CONNECTED)

        match state:
            case ThermostatConnectionState.CONNECTED:
                self.connect_btn.setText("Disconnect")
                self.status_lbl.setText(
                    "Connected to Thermostat v"
                    f"{self._thermostat.hw_rev['rev']['major']}."
                    f"{self._thermostat.hw_rev['rev']['minor']}"
                )

            case ThermostatConnectionState.CONNECTING:
                self.connect_btn.setText("Stop")
                self.status_lbl.setText("Connecting...")

            case ThermostatConnectionState.DISCONNECTED:
                self.connect_btn.setText("Connect")
                self.status_lbl.setText("Disconnected")

    @asyncSlot()
    async def on_connect_btn_clicked(self):
        match self._thermostat.connection_state:
            case ThermostatConnectionState.DISCONNECTED:
                self._connecting_task = asyncio.current_task()
                self._thermostat.connection_state = ThermostatConnectionState.CONNECTING
                await self._thermostat.start_session(
                    host=self.connection_details_menu.host_set_line.text(),
                    port=self.connection_details_menu.port_set_spin.value(),
                )
                self._connecting_task = None
                self._thermostat.connection_state = ThermostatConnectionState.CONNECTED
                self._thermostat.start_watching()

            case ThermostatConnectionState.CONNECTING:
                self._connecting_task.cancel()
                self._connecting_task = None
                await self._thermostat.end_session()
                self._thermostat.connection_state = (
                    ThermostatConnectionState.DISCONNECTED
                )

            case ThermostatConnectionState.CONNECTED:
                await self._thermostat.end_session()
                self._thermostat.connection_state = (
                    ThermostatConnectionState.DISCONNECTED
                )


async def coro_main():
    args = get_argparser().parse_args()
    if args.logLevel:
        logging.basicConfig(level=getattr(logging, args.logLevel))

    app_quit_event = asyncio.Event()

    app = QtWidgets.QApplication.instance()
    app.aboutToQuit.connect(app_quit_event.set)
    app.setWindowIcon(
        QtGui.QIcon(
            str(importlib.resources.files("pytec.gui.resources").joinpath("artiq.ico"))
        )
    )

    main_window = MainWindow()
    main_window.show()

    if args.connect:
        if args.host:
            main_window.connection_details_menu.host_set_line.setText(args.host)
        if args.port:
            main_window.connection_details_menu.port_set_spin.setValue(int(args.port))
        main_window.connect_btn.click()

    await app_quit_event.wait()


def main():
    qasync.run(coro_main())


if __name__ == "__main__":
    main()