from kivymd.app import MDApp
from kivymd.uix.screen import MDScreen
from kivy.lang import Builder
from gui.popups.popups import DualRowPopup, QuitPopup, TwoActionPopup
from lib.com import ComSuperClass
import platform


# Information for errors encountered when using pyserial
information = {
    "Windows": {
        "2": "Un- and replug the cable and ensure you have the required driver(s) installed",
        "13": "You are probably missing a required driver or your cable doesn't work. Consult the wiki for more information",
        "NO_COM": "Could not find a microcontroller. Please ensure you have one connected and the required driver(s) installed"
    },
    "Linux": {
        "2": "Un- and replug the cable, or if you haven't plugged a controller in yet, do that",
        "13": "Incorrect permissions at /dev/ttyUSB0. Open a terminal and type: sudo chmod 777 /dev/ttyUSB0",
        "NO_COM": "Could not find a microcontroller. Please ensure you have one connected"
    }
}


# This is the launch screen, i.e. what you see when you start up the app
class HomeScreen(MDScreen):
    def __init__(self, com: ComSuperClass, **kw):
        self._com = com;
        super().__init__(**kw)

    # Go to the main screen if we can establish connection or the check was disabled 
    # in the configs
    def start(self):
        if self._com.connect():
            self.manager.current = 'main'
            self.manager.transition.direction = 'right'
        else:
            TwoActionPopup().open('Failed to connect', 'Details', self.open_details_popup)
            print('ERROR connecting')

    # Open popup for details as to why the connection failed
    def open_details_popup(self):
        DualRowPopup().open("Troubleshooting tips", self._generate_help())

    def _generate_help(self) -> str:
        operating_system = platform.system()
        if operating_system == "Windows" or operating_system == "Linux":
            port = self._com.get_comport();
            information["Linux"]["13"] = f"Incorrect permissions at {port}. Resolve by running 'sudo chmod 777 {port}'"
            if port == "":
                return information[operating_system]["NO_COM"]
            err = self._com.get_error()
            if err != None:
                return information[operating_system][str(err.errno)]
            else:
                return "No error message available"
        else:
            return "You are running on an unsupported Operating System. No help available"

    # Helper to open a Popup to ask user whether to quit or not
    def quit(self):
        QuitPopup(self._com).open()

    # Switch to about screen
    def to_about(self):
        self.manager.current = 'about'
        self.manager.transition.direction = 'down'


# Load the design file for this screen (.kv files)
# The path has to be relative to root of the app, i.e. where the biogascontrollerapp.py 
# file is located
Builder.load_file('./gui/home/home.kv')