import logging

from email_validator import validate_email, EmailNotValidError
from rio import Column, Component, event, Text, TextStyle, TextInput, TextInputChangeEvent, Button

from src.ez_lan_manager import ConfigurationService, UserService, MailingService
from src.ez_lan_manager.components.AnimatedText import AnimatedText
from src.ez_lan_manager.components.MainViewContentBox import MainViewContentBox

MINIMUM_PASSWORD_LENGTH = 6

logger = logging.getLogger(__name__.split(".")[-1])


class RegisterPage(Component):
    def on_pw_focus_loss(self, _: TextInputChangeEvent) -> None:
        if not (self.pw_1.text == self.pw_2.text) or len(self.pw_1.text) < MINIMUM_PASSWORD_LENGTH:
            self.pw_1.is_valid = False
            self.pw_2.is_valid = False
            return
        self.pw_1.is_valid = True
        self.pw_2.is_valid = True

    def on_email_focus_loss(self, change_event: TextInputChangeEvent) -> None:
        try:
            validate_email(change_event.text, check_deliverability=False)
            self.email_input.is_valid = True
        except EmailNotValidError:
            self.email_input.is_valid = False

    def on_user_name_focus_loss(self, _: TextInputChangeEvent) -> None:
        current_text = self.user_name_input.text
        if len(current_text) > UserService.MAX_USERNAME_LENGTH:
            self.user_name_input.text = current_text[:UserService.MAX_USERNAME_LENGTH]

    async def on_submit_button_pressed(self) -> None:
        self.submit_button.is_loading = True
        self.submit_button.force_refresh()

        if len(self.user_name_input.text) < 1:
            await self.animated_text.display_text(False, "Nutzername darf nicht leer sein!")
            self.submit_button.is_loading = False
            return

        if not (self.pw_1.text == self.pw_2.text):
            await self.animated_text.display_text(False, "Passwörter stimmen nicht überein!")
            self.submit_button.is_loading = False
            return

        if len(self.pw_1.text) < MINIMUM_PASSWORD_LENGTH:
            await self.animated_text.display_text(False, f"Passwort muss mindestens {MINIMUM_PASSWORD_LENGTH} Zeichen lang sein!")
            self.submit_button.is_loading = False
            return

        if not self.email_input.is_valid or len(self.email_input.text) < 3:
            await self.animated_text.display_text(False, "E-Mail Adresse ungültig!")
            self.submit_button.is_loading = False
            return

        user_service = self.session[UserService]
        mailing_service = self.session[MailingService]
        lan_info = self.session[ConfigurationService].get_lan_info()

        if await user_service.get_user(self.email_input.text) is not None or await user_service.get_user(self.user_name_input.text) is not None:
            await self.animated_text.display_text(False, "Benutzername oder E-Mail bereits regestriert!")
            self.submit_button.is_loading = False
            return

        try:
            new_user = await user_service.create_user(self.user_name_input.text, self.email_input.text, self.pw_1.text)
            if not new_user:
                logger.warning(f"UserService.create_user returned: {new_user}")  # ToDo: Seems like the user is created fine, even if not returned #FixMe
        except Exception as e:
            logger.error(f"Unknown error during new user registration: {e}")
            await self.animated_text.display_text(False, "Es ist ein unbekannter Fehler aufgetreten :(")
            self.submit_button.is_loading = False
            return

        await mailing_service.send_email(
            subject="Erfolgreiche Registrierung",
            body=f"Hallo {self.user_name_input.text},\n\n"
                 f"Du hast dich erfolgreich beim EZ-LAN Manager für {lan_info.name} {lan_info.iteration} registriert.\n\n"
                 f"Wenn du dich nicht registriert hast, kontaktiere bitte unser Team über unsere Homepage.\n\n"
                 f"Liebe Grüße\nDein {lan_info.name} - Team",
            receiver=self.email_input.text
        )

        self.submit_button.is_loading = False
        await self.animated_text.display_text(True, "Erfolgreich registriert!")

    @event.on_populate
    async def on_populate(self) -> None:
        await self.session.set_title(f"{self.session[ConfigurationService].get_lan_info().name} - Registrieren")

    def build(self) -> Component:
        self.user_name_input = TextInput(
            label="Benutzername",
            text="",
            margin_left=1,
            margin_right=1,
            margin_bottom=1,
            grow_x=True,
            on_lose_focus=self.on_user_name_focus_loss
        )
        self.email_input = TextInput(
            label="E-Mail Adresse",
            text="",
            margin_left=1,
            margin_right=1,
            margin_bottom=1,
            grow_x=True,
            on_lose_focus=self.on_email_focus_loss
        )
        self.pw_1 = TextInput(
            label="Passwort",
            text="",
            margin_left=1,
            margin_right=1,
            margin_bottom=1,
            grow_x=True,
            is_secret=True,
            on_lose_focus=self.on_pw_focus_loss
        )
        self.pw_2 = TextInput(
            label="Passwort wiederholen",
            text="",
            margin_left=1,
            margin_right=1,
            margin_bottom=1,
            grow_x=True,
            is_secret=True,
            on_lose_focus=self.on_pw_focus_loss
        )
        self.submit_button = Button(
            content=Text(
                "Registrieren",
                style=TextStyle(fill=self.session.theme.background_color, font_size=0.9),
                align_x=0.5
            ),
            grow_x=True,
            margin_top=2,
            margin_left=1,
            margin_right=1,
            margin_bottom=1,
            shape="rectangle",
            style="minor",
            color=self.session.theme.secondary_color,
            on_press=self.on_submit_button_pressed
        )
        self.animated_text = AnimatedText(
            margin_top=2,
            margin_left=1,
            margin_right=1,
            margin_bottom=2
        )
        return Column(
            MainViewContentBox(
                content=Column(
                    Text(
                        "Neues Konto anlegen",
                        style=TextStyle(
                            fill=self.session.theme.background_color,
                            font_size=1.2
                        ),
                        margin_top=2,
                        margin_bottom=2,
                        align_x=0.5
                    ),
                    self.user_name_input,
                    self.email_input,
                    self.pw_1,
                    self.pw_2,
                    self.submit_button,
                    self.animated_text
                )
            ),
            align_y=0,
        )