import { datadogRum } from "@datadog/browser-rum";
import { useEffect, useState } from "react";

import type { User } from "@dndbeyond/authentication-lib-js";

import config from "~/config";
import { useConsent } from "~/hooks/useConsent";

const isDndbeyondUrl = (url: string): boolean => {
  try {
    const { protocol, hostname } = new URL(url);
    return (
      protocol === "https:" &&
      (hostname === "dndbeyond.com" || hostname.endsWith(".dndbeyond.com"))
    );
  } catch {
    return false;
  }
};

export const useDatadogRum = (user: User | null) => {
  const [hasConsent, setHasConsent] = useState(false);
  const [isInitialized, setIsInitialized] = useState(false);
  const environment = config.environment;
  const version = config.version.replace(/@dndbeyond\/character-app@/, ""); // example: 1.70.116
  const { setupAnalyticsConsentListener } = useConsent();

  useEffect(() => {
    const unsubscribe = setupAnalyticsConsentListener(setHasConsent);

    return () => {
      unsubscribe();
    };
  }, [setupAnalyticsConsentListener]);

  useEffect(() => {
    if (datadogRum.getInternalContext()) {
      return;
    }

    try {
      datadogRum.init({
        applicationId: "2cfa3248-a632-4f5b-bf9e-aafa18dc69ae", // Not a secret, safe to include in client code
        clientToken: "pub940bbbc614a4ae3ab0c872fdad597554", // Not a secret, safe to include in client code
        site: "datadoghq.com",
        service: "characters-app",
        env: environment === "production" ? "live" : environment,
        version: `${version}`,
        sessionSampleRate: environment === "production" ? 10 : 100,
        sessionReplaySampleRate: environment === "production" ? 1 : 10,
        traceContextInjection: "sampled",
        traceSampleRate: 10,
        trackingConsent: "not-granted", // Start with no consent, will update when consent status is known
        trackUserInteractions: true,
        trackResources: true,
        trackLongTasks: true,
        defaultPrivacyLevel: "mask-user-input",
        allowedTracingUrls: [isDndbeyondUrl],
      });

      setIsInitialized(true);
    } catch (error) {
      console.warn("Datadog RUM failed to initialize:", error);
    }
  }, [environment]);

  useEffect(() => {
    if (!isInitialized) {
      return;
    }

    if (!user) {
      datadogRum.clearUser();
      return;
    }

    datadogRum.setUser({
      id: `${user.id ?? ""}`,
      name: `${user.name ?? ""}`,
      sub_tier: `${user.subscriptionTier ?? ""}`,
    });
  }, [user, isInitialized]);

  useEffect(() => {
    if (!isInitialized) {
      return;
    }

    datadogRum.setTrackingConsent(hasConsent ? "granted" : "not-granted");
  }, [hasConsent, isInitialized]);
};