import json
import re
from urllib.parse import urlparse

import phonenumbers
from phonenumbers import NumberParseException
from telegram import Bot
from twilio.base.exceptions import TwilioException
from twilio.rest import Client

from common.api_helpers.utils import create_engine_url


class LiveSettingProxy:
    def __dir__(self):
        from apps.base.models import LiveSetting

        return LiveSetting.AVAILABLE_NAMES

    def __getattr__(self, item):
        from apps.base.models import LiveSetting

        value = LiveSetting.get_setting(item)
        return value

    def __setattr__(self, key, value):
        from apps.base.models import LiveSetting

        LiveSetting.objects.update_or_create(name=key, defaults={"value": value})


live_settings = LiveSettingProxy()


class LiveSettingValidator:
    EMPTY_VALID_NAMES = (
        "TWILIO_AUTH_TOKEN",
        "TWILIO_API_KEY_SID",
        "TWILIO_API_KEY_SECRET",
    )

    def __init__(self, live_setting):
        self.live_setting = live_setting

    def get_error(self):
        check_fn_name = f"_check_{self.live_setting.name.lower()}"

        if self.live_setting.value in (None, "") and self.live_setting.name not in self.EMPTY_VALID_NAMES:
            return "Empty"

        # skip validation if there's no handler for it
        if not hasattr(self, check_fn_name):
            return None

        check_fn = getattr(self, check_fn_name)
        return check_fn(self.live_setting.value)

    @classmethod
    def _check_twilio_api_key_sid(cls, twilio_api_key_sid):
        if live_settings.TWILIO_AUTH_TOKEN:
            return

        try:
            Client(
                twilio_api_key_sid, live_settings.TWILIO_API_KEY_SECRET, live_settings.TWILIO_ACCOUNT_SID
            ).api.applications.list(limit=1)
        except Exception as e:
            return cls._prettify_twilio_error(e)

    @classmethod
    def _check_twilio_api_key_secret(cls, twilio_api_key_secret):
        if live_settings.TWILIO_AUTH_TOKEN:
            return

        try:
            Client(
                live_settings.TWILIO_API_KEY_SID, twilio_api_key_secret, live_settings.TWILIO_ACCOUNT_SID
            ).api.applications.list(limit=1)
        except Exception as e:
            return cls._prettify_twilio_error(e)

    @classmethod
    def _check_twilio_account_sid(cls, twilio_account_sid):
        try:
            if live_settings.TWILIO_API_KEY_SID and live_settings.TWILIO_API_KEY_SECRET:
                Client(
                    live_settings.TWILIO_API_KEY_SID, live_settings.TWILIO_API_KEY_SECRET, twilio_account_sid
                ).api.applications.list(limit=1)
            else:
                Client(twilio_account_sid, live_settings.TWILIO_AUTH_TOKEN).api.applications.list(limit=1)
        except Exception as e:
            return cls._prettify_twilio_error(e)

    @classmethod
    def _check_twilio_auth_token(cls, twilio_auth_token):
        if live_settings.TWILIO_API_KEY_SID and live_settings.TWILIO_API_KEY_SECRET:
            return

        try:
            Client(live_settings.TWILIO_ACCOUNT_SID, twilio_auth_token).api.applications.list(limit=1)
        except Exception as e:
            return cls._prettify_twilio_error(e)

    @classmethod
    def _check_twilio_verify_service_sid(cls, twilio_verify_service_sid):
        try:
            if live_settings.TWILIO_API_KEY_SID and live_settings.TWILIO_API_KEY_SECRET:
                twilio_client = Client(
                    live_settings.TWILIO_API_KEY_SID,
                    live_settings.TWILIO_API_KEY_SECRET,
                    live_settings.TWILIO_ACCOUNT_SID,
                )
            else:
                twilio_client = Client(live_settings.TWILIO_ACCOUNT_SID, live_settings.TWILIO_AUTH_TOKEN)
            twilio_client.verify.services(twilio_verify_service_sid).rate_limits.list(limit=1)
        except Exception as e:
            return cls._prettify_twilio_error(e)

    @classmethod
    def _check_twilio_number(cls, twilio_number):
        if not cls._is_phone_number_valid(twilio_number):
            return "Please specify a valid phone number in the following format: +XXXXXXXXXXX"

    @classmethod
    def _check_slack_install_return_redirect_host(cls, slack_install_return_redirect_host):
        scheme = urlparse(slack_install_return_redirect_host).scheme
        if scheme != "https":
            return "Must use https"

    @classmethod
    def _check_telegram_token(cls, telegram_token):
        try:
            bot = Bot(telegram_token)
            bot.get_me()
        except Exception as e:
            return f"Telegram error: {str(e)}"

    @classmethod
    def _check_telegram_webhook_host(cls, telegram_webhook_host):
        try:
            # avoid circular import
            from apps.telegram.client import TelegramClient

            url = create_engine_url("/telegram/", override_base=telegram_webhook_host)
            TelegramClient().register_webhook(url)
        except Exception as e:
            return f"Telegram error: {str(e)}"

    @classmethod
    def _check_grafana_cloud_oncall_token(cls, grafana_oncall_token):
        from apps.oss_installation.models import CloudConnector

        _, err = CloudConnector.sync_with_cloud(grafana_oncall_token)
        return err

    @staticmethod
    def _is_email_valid(email):
        return re.match(r"^[^@]+@[^@]+\.[^@]+$", email)

    @staticmethod
    def _is_phone_number_valid(phone_number):
        try:
            ph_num = phonenumbers.parse(phone_number)
            return phonenumbers.is_valid_number(ph_num)
        except NumberParseException:
            return False

    @staticmethod
    def _prettify_twilio_error(exc):
        if isinstance(exc, TwilioException):
            if len(exc.args) > 1:
                response_content = exc.args[1].content
                content = json.loads(response_content)

                error_code = content["code"]
                more_info = content["more_info"]
                return f"Twilio error: code {error_code}. Learn more: {more_info}"
            else:
                return f"Twilio error: {exc.args[0]}"
        else:
            return f"Twilio error: {str(exc)}"