import os
import sys
import json

import traceback
from typing import Any

import firebase_admin
from firebase_admin import messaging, firestore


class CloudMessage:
    def __init__(self, firebase_app: firebase_admin.App):
        self.firebase_app = firebase_app
        self.db = firestore.client(app=firebase_app)

    def get_tokens(self):
        users_ref = self.db.collection("users")
        docs = users_ref.stream()
        registeration_tokens = []
        for doc in docs:
            registeration_tokens.append(doc.to_dict()["token"])
        return registeration_tokens

    def exception_detail(self, e):
        error_class = e.__class__.__name__
        detail = e.args[0]
        cl, exc, tb = sys.exc_info()
        lastCallStack = traceback.extract_tb(tb)[-1]
        fileName = lastCallStack[0]
        lineNum = lastCallStack[1]
        funcName = lastCallStack[2]
        errMsg = 'File "{}", line {}, in {}: [{}] {}'.format(
            fileName, lineNum, funcName, error_class, detail
        )
        return errMsg

    def send_message(self, notification, token_list):
        if token_list == []:
            return False, "token_list empty"
        if notification.get("title") not in [None, ""]:
            notify = messaging.Notification(
                title=notification.get("title"),
                body=notification.get("content", ""),
            )
            android_notify = messaging.AndroidNotification(
                title=notification.get("title"),
                body=notification.get("content", ""),
                default_sound=True,
            )
        else:
            notify = messaging.Notification(body=notification.get("content", ""))
            android_notify = messaging.AndroidNotification(
                body=notification.get("content", ""), default_sound=True
            )

        multi_msg = messaging.MulticastMessage(
            notification=notify,
            tokens=token_list,
            data={}
            if "route" not in notification
            else {"direct": notification["route"]},
            android=messaging.AndroidConfig(
                notification=android_notify, priority="high"
            ),
            apns=messaging.APNSConfig(
                payload=messaging.APNSPayload(
                    messaging.Aps(sound=messaging.CriticalSound("default", volume=1.0))
                )
            ),
        )
        response = messaging.send_multicast(
            multi_msg,
            app=self.firebase_app,
        )
        failed_tokens = []
        if response.failure_count > 0:
            responses = response.responses
            for idx, resp in enumerate(responses):
                if not resp.success:
                    # The order of responses corresponds to the order of the registration tokens.
                    failed_tokens.append(token_list[idx])
            print("List of tokens that caused failures: {0}".format(failed_tokens))
        return True, "send to {} devices, with {} successed, with {} failed.".format(
            len(token_list), response.success_count, response.failure_count
        )